mono/io-layer/handles.c

   1 /*
   2  * handles.c:  Generic and internal operations on handles
   3  *
   4  * Author:
   5  *      Dick Porter (dick@ximian.com)
   6  *
   7  * (C) 2002-2006 Novell, Inc.
   8  */
   9
  10 #include <config.h>
  11 #include <glib.h>
  12 #include <pthread.h>
  13 #include <errno.h>
  14 #include <unistd.h>
  15 #include <string.h>
  16 #include <sys/types.h>
  17 #ifdef HAVE_SYS_SOCKET_H
  18 #  include <sys/socket.h>
  19 #endif
  20 #ifdef HAVE_SYS_UN_H
  21 #  include <sys/un.h>
  22 #endif
  23 #ifdef HAVE_SYS_MMAN_H
  24 #  include <sys/mman.h>
  25 #endif
  26 #ifdef HAVE_DIRENT_H
  27 #  include <dirent.h>
  28 #endif
  29 #include <sys/stat.h>
  30
  31 #include <mono/utils/gc_wrapper.h>
  32
  33 #include <mono/io-layer/wapi.h>
  34 #include <mono/io-layer/wapi-private.h>
  35 #include <mono/io-layer/handles-private.h>
  36 #include <mono/io-layer/mono-mutex.h>
  37 #include <mono/io-layer/misc-private.h>
  38 #include <mono/io-layer/shared.h>
  39 #include <mono/io-layer/collection.h>
  40 #include <mono/io-layer/process-private.h>
  41 #include <mono/io-layer/critical-section-private.h>
  42
  43 #undef DEBUG
  44 #undef DEBUG_REFS
  45
  46 static void (*_wapi_handle_ops_get_close_func (WapiHandleType type))(gpointer, gpointer);
  47
  48 static WapiHandleCapability handle_caps[WAPI_HANDLE_COUNT]={0};
  49 static struct _WapiHandleOps *handle_ops[WAPI_HANDLE_COUNT]={
  50         NULL,
  51         &_wapi_file_ops,
  52         &_wapi_console_ops,
  53         &_wapi_thread_ops,
  54         &_wapi_sem_ops,
  55         &_wapi_mutex_ops,
  56         &_wapi_event_ops,
  57         &_wapi_socket_ops,
  58         &_wapi_find_ops,
  59         &_wapi_process_ops,
  60         &_wapi_pipe_ops,
  61         &_wapi_namedmutex_ops,
  62         &_wapi_namedsem_ops,
  63         &_wapi_namedevent_ops,
  64 };
  65
  66 static void _wapi_shared_details (gpointer handle_info);
  67
  68 static void (*handle_details[WAPI_HANDLE_COUNT])(gpointer) = {
  69         NULL,
  70         _wapi_file_details,
  71         _wapi_console_details,
  72         _wapi_shared_details,   /* thread */
  73         _wapi_sem_details,
  74         _wapi_mutex_details,
  75         _wapi_event_details,
  76         NULL,                   /* Nothing useful to see in a socket handle */
  77         NULL,                   /* Nothing useful to see in a find handle */
  78         _wapi_shared_details,   /* process */
  79         _wapi_pipe_details,
  80         _wapi_shared_details,   /* namedmutex */
  81         _wapi_shared_details,   /* namedsem */
  82         _wapi_shared_details,   /* namedevent */
  83 };
  84
  85 const char *_wapi_handle_typename[] = {
  86         "Unused",
  87         "File",
  88         "Console",
  89         "Thread",
  90         "Sem",
  91         "Mutex",
  92         "Event",
  93         "Socket",
  94         "Find",
  95         "Process",
  96         "Pipe",
  97         "N.Mutex",
  98         "N.Sem",
  99         "N.Event",
 100         "Error!!"
 101 };
 102
 103 /*
 104  * We can hold _WAPI_PRIVATE_MAX_SLOTS * _WAPI_HANDLE_INITIAL_COUNT handles.
 105  * If 4M handles are not enough... Oh, well... we will crash.
 106  */
 107 #define SLOT_INDEX(x)   (x / _WAPI_HANDLE_INITIAL_COUNT)
 108 #define SLOT_OFFSET(x)  (x % _WAPI_HANDLE_INITIAL_COUNT)
 109
 110 struct _WapiHandleUnshared *_wapi_private_handles [_WAPI_PRIVATE_MAX_SLOTS];
 111 static guint32 _wapi_private_handle_count = 0;
 112 static guint32 _wapi_private_handle_slot_count = 0;
 113
 114 struct _WapiHandleSharedLayout *_wapi_shared_layout = NULL;
 115 struct _WapiFileShareLayout *_wapi_fileshare_layout = NULL;
 116
 117 guint32 _wapi_fd_reserve;
 118
 119 /*
 120  * This is an internal handle which is used for handling waiting for multiple handles.
 121  * Threads which wait for multiple handles wait on this one handle, and when a handle
 122  * is signalled, this handle is signalled too.
 123  */
 124 static gpointer _wapi_global_signal_handle;
 125
 126 /* Point to the mutex/cond inside _wapi_global_signal_handle */
 127 mono_mutex_t *_wapi_global_signal_mutex;
 128 pthread_cond_t *_wapi_global_signal_cond;
 129
 130 int _wapi_sem_id;
 131 gboolean _wapi_has_shut_down = FALSE;
 132
 133 /* Use this instead of getpid(), to cope with linuxthreads.  It's a
 134  * function rather than a variable lookup because we need to get at
 135  * this before share_init() might have been called.
 136  */
 137 static pid_t _wapi_pid;
 138 static mono_once_t pid_init_once = MONO_ONCE_INIT;
 139
 140 static gpointer _wapi_handle_real_new (WapiHandleType type, gpointer handle_specific);
 141
 142 static void pid_init (void)
 143 {
 144         _wapi_pid = getpid ();
 145 }
 146
 147 pid_t _wapi_getpid (void)
 148 {
 149         mono_once (&pid_init_once, pid_init);
 150
 151         return(_wapi_pid);
 152 }
 153
 154
 155 static mono_mutex_t scan_mutex = MONO_MUTEX_INITIALIZER;
 156
 157 static void handle_cleanup (void)
 158 {
 159         int i, j, k;
 160
 161         _wapi_process_signal_self ();
 162
 163         /* Every shared handle we were using ought really to be closed
 164          * by now, but to make sure just blow them all away.  The
 165          * exiting finalizer thread in particular races us to the
 166          * program exit and doesn't always win, so it can be left
 167          * cluttering up the shared file.  Anything else left over is
 168          * really a bug.
 169          */
 170         for(i = SLOT_INDEX (0); _wapi_private_handles[i] != NULL; i++) {
 171                 for(j = SLOT_OFFSET (0); j < _WAPI_HANDLE_INITIAL_COUNT; j++) {
 172                         struct _WapiHandleUnshared *handle_data = &_wapi_private_handles[i][j];
 173                         int type = handle_data->type;
 174
 175
 176                         if (_WAPI_SHARED_HANDLE (type)) {
 177                                 gpointer handle = GINT_TO_POINTER (i*_WAPI_HANDLE_INITIAL_COUNT+j);
 178
 179                                 if (type == WAPI_HANDLE_THREAD) {
 180                                         /* Special-case thread handles
 181                                          * because they need extra
 182                                          * cleanup.  This also avoids
 183                                          * a race condition between
 184                                          * the application exit and
 185                                          * the finalizer thread - if
 186                                          * it finishes up between now
 187                                          * and actual app termination
 188                                          * it will find all its handle
 189                                          * details have been blown
 190                                          * away, so this sets those
 191                                          * anyway.
 192                                          */
 193                                         _wapi_thread_set_termination_details (handle, 0);
 194                                 }
 195
 196                                 for(k = handle_data->ref; k > 0; k--) {
 197 #ifdef DEBUG
 198                                         g_message ("%s: unreffing %s handle %p", __func__, _wapi_handle_typename[type], handle);
 199 #endif
 200
 201                                         _wapi_handle_unref (handle);
 202                                 }
 203                         }
 204                 }
 205         }
 206
 207         _wapi_shm_semaphores_remove ();
 208 }
 209
 210 void _wapi_cleanup ()
 211 {
 212         g_assert (_wapi_has_shut_down == FALSE);
 213
 214         _wapi_has_shut_down = TRUE;
 215
 216         _wapi_critical_section_cleanup ();
 217         _wapi_error_cleanup ();
 218         _wapi_thread_cleanup ();
 219 }
 220
 221 static mono_once_t shared_init_once = MONO_ONCE_INIT;
 222 static void shared_init (void)
 223 {
 224         g_assert ((sizeof (handle_ops) / sizeof (handle_ops[0]))
 225                   == WAPI_HANDLE_COUNT);
 226
 227         _wapi_fd_reserve = getdtablesize();
 228
 229         /* This is needed by the code in _wapi_handle_new_internal */
 230         _wapi_fd_reserve = (_wapi_fd_reserve + (_WAPI_HANDLE_INITIAL_COUNT - 1)) & ~(_WAPI_HANDLE_INITIAL_COUNT - 1);
 231
 232         do {
 233                 /*
 234                  * The entries in _wapi_private_handles reserved for fds are allocated lazily to
 235                  * save memory.
 236                  */
 237                 /*
 238                 _wapi_private_handles [idx++] = g_new0 (struct _WapiHandleUnshared,
 239                                                         _WAPI_HANDLE_INITIAL_COUNT);
 240                 */
 241
 242                 _wapi_private_handle_count += _WAPI_HANDLE_INITIAL_COUNT;
 243                 _wapi_private_handle_slot_count ++;
 244         } while(_wapi_fd_reserve > _wapi_private_handle_count);
 245
 246         _wapi_shm_semaphores_init ();
 247
 248         _wapi_shared_layout = _wapi_shm_attach (WAPI_SHM_DATA);
 249         g_assert (_wapi_shared_layout != NULL);
 250
 251         _wapi_fileshare_layout = _wapi_shm_attach (WAPI_SHM_FILESHARE);
 252         g_assert (_wapi_fileshare_layout != NULL);
 253
 254 #if !defined (DISABLE_SHARED_HANDLES)
 255         if (!g_getenv ("MONO_DISABLE_SHM"))
 256                 _wapi_collection_init ();
 257 #endif
 258
 259         /* Can't call wapi_handle_new as it calls us recursively */
 260         _wapi_global_signal_handle = _wapi_handle_real_new (WAPI_HANDLE_EVENT, NULL);
 261
 262         _wapi_global_signal_cond = &_WAPI_PRIVATE_HANDLES (GPOINTER_TO_UINT (_wapi_global_signal_handle)).signal_cond;
 263         _wapi_global_signal_mutex = &_WAPI_PRIVATE_HANDLES (GPOINTER_TO_UINT (_wapi_global_signal_handle)).signal_mutex;
 264
 265         /* Using g_atexit here instead of an explicit function call in
 266          * a cleanup routine lets us cope when a third-party library
 267          * calls exit (eg if an X client loses the connection to its
 268          * server.)
 269          */
 270         g_atexit (handle_cleanup);
 271 }
 272
 273 static void _wapi_handle_init_shared (struct _WapiHandleShared *handle,
 274                                       WapiHandleType type,
 275                                       gpointer handle_specific)
 276 {
 277         g_assert (_wapi_has_shut_down == FALSE);
 278
 279         handle->type = type;
 280         handle->timestamp = (guint32)(time (NULL) & 0xFFFFFFFF);
 281         handle->signalled = FALSE;
 282         handle->handle_refs = 1;
 283
 284         if (handle_specific != NULL) {
 285                 memcpy (&handle->u, handle_specific, sizeof (handle->u));
 286         }
 287 }
 288
 289 static void _wapi_handle_init (struct _WapiHandleUnshared *handle,
 290                                WapiHandleType type, gpointer handle_specific)
 291 {
 292         int thr_ret;
 293
 294         g_assert (_wapi_has_shut_down == FALSE);
 295
 296         handle->type = type;
 297         handle->signalled = FALSE;
 298         handle->ref = 1;
 299
 300         if (!_WAPI_SHARED_HANDLE(type)) {
 301                 thr_ret = pthread_cond_init (&handle->signal_cond, NULL);
 302                 g_assert (thr_ret == 0);
 303
 304                 thr_ret = mono_mutex_init (&handle->signal_mutex, NULL);
 305                 g_assert (thr_ret == 0);
 306
 307                 if (handle_specific != NULL) {
 308                         memcpy (&handle->u, handle_specific,
 309                                 sizeof (handle->u));
 310                 }
 311         }
 312 }
 313
 314 static guint32 _wapi_handle_new_shared (WapiHandleType type,
 315                                         gpointer handle_specific)
 316 {
 317         guint32 offset;
 318         static guint32 last = 1;
 319         int thr_ret;
 320
 321         g_assert (_wapi_has_shut_down == FALSE);
 322
 323         /* Leave the first slot empty as a guard */
 324 again:
 325         /* FIXME: expandable array */
 326         for(offset = last; offset <_WAPI_HANDLE_INITIAL_COUNT; offset++) {
 327                 struct _WapiHandleShared *handle = &_wapi_shared_layout->handles[offset];
 328
 329                 if(handle->type == WAPI_HANDLE_UNUSED) {
 330                         thr_ret = _wapi_handle_lock_shared_handles ();
 331                         g_assert (thr_ret == 0);
 332
 333                         if (InterlockedCompareExchange ((gint32 *)&handle->type, type, WAPI_HANDLE_UNUSED) == WAPI_HANDLE_UNUSED) {
 334                                 last = offset + 1;
 335
 336                                 _wapi_handle_init_shared (handle, type,
 337                                                           handle_specific);
 338
 339                                 _wapi_handle_unlock_shared_handles ();
 340
 341                                 return(offset);
 342                         } else {
 343                                 /* Someone else beat us to it, just
 344                                  * continue looking
 345                                  */
 346                         }
 347
 348                         _wapi_handle_unlock_shared_handles ();
 349                 }
 350         }
 351
 352         if(last > 1) {
 353                 /* Try again from the beginning */
 354                 last = 1;
 355                 goto again;
 356         }
 357
 358         /* Will need to expand the array.  The caller will sort it out */
 359
 360         return(0);
 361 }
 362
 363 /*
 364  * _wapi_handle_new_internal:
 365  * @type: Init handle to this type
 366  *
 367  * Search for a free handle and initialize it. Return the handle on
 368  * success and 0 on failure.  This is only called from
 369  * _wapi_handle_new, and scan_mutex must be held.
 370  */
 371 static guint32 _wapi_handle_new_internal (WapiHandleType type,
 372                                           gpointer handle_specific)
 373 {
 374         guint32 i, k, count;
 375         static guint32 last = 0;
 376         gboolean retry = FALSE;
 377
 378         g_assert (_wapi_has_shut_down == FALSE);
 379
 380         /* A linear scan should be fast enough.  Start from the last
 381          * allocation, assuming that handles are allocated more often
 382          * than they're freed. Leave the space reserved for file
 383          * descriptors
 384          */
 385
 386         if (last < _wapi_fd_reserve) {
 387                 last = _wapi_fd_reserve;
 388         } else {
 389                 retry = TRUE;
 390         }
 391
 392 again:
 393         count = last;
 394         for(i = SLOT_INDEX (count); i < _wapi_private_handle_slot_count; i++) {
 395                 if (_wapi_private_handles [i]) {
 396                         for (k = SLOT_OFFSET (count); k < _WAPI_HANDLE_INITIAL_COUNT; k++) {
 397                                 struct _WapiHandleUnshared *handle = &_wapi_private_handles [i][k];
 398
 399                                 if(handle->type == WAPI_HANDLE_UNUSED) {
 400                                         last = count + 1;
 401
 402                                         _wapi_handle_init (handle, type, handle_specific);
 403                                         return (count);
 404                                 }
 405                                 count++;
 406                         }
 407                 }
 408         }
 409
 410         if(retry && last > _wapi_fd_reserve) {
 411                 /* Try again from the beginning */
 412                 last = _wapi_fd_reserve;
 413                 goto again;
 414         }
 415
 416         /* Will need to expand the array.  The caller will sort it out */
 417
 418         return(0);
 419 }
 420
 421 static gpointer _wapi_handle_real_new (WapiHandleType type, gpointer handle_specific)
 422 {
 423         guint32 handle_idx = 0;
 424         gpointer handle;
 425         int thr_ret;
 426
 427 #ifdef DEBUG
 428         g_message ("%s: Creating new handle of type %s", __func__,
 429                    _wapi_handle_typename[type]);
 430 #endif
 431
 432         g_assert(!_WAPI_FD_HANDLE(type));
 433
 434         pthread_cleanup_push ((void(*)(void *))mono_mutex_unlock_in_cleanup,
 435                               (void *)&scan_mutex);
 436         thr_ret = mono_mutex_lock (&scan_mutex);
 437         g_assert (thr_ret == 0);
 438
 439         while ((handle_idx = _wapi_handle_new_internal (type, handle_specific)) == 0) {
 440                 /* Try and expand the array, and have another go */
 441                 int idx = SLOT_INDEX (_wapi_private_handle_count);
 442                 if (idx >= _WAPI_PRIVATE_MAX_SLOTS) {
 443                         break;
 444                 }
 445
 446                 _wapi_private_handles [idx] = g_new0 (struct _WapiHandleUnshared,
 447                                                 _WAPI_HANDLE_INITIAL_COUNT);
 448
 449                 _wapi_private_handle_count += _WAPI_HANDLE_INITIAL_COUNT;
 450                 _wapi_private_handle_slot_count ++;
 451         }
 452
 453         thr_ret = mono_mutex_unlock (&scan_mutex);
 454         g_assert (thr_ret == 0);
 455         pthread_cleanup_pop (0);
 456
 457         if (handle_idx == 0) {
 458                 /* We ran out of slots */
 459                 handle = _WAPI_HANDLE_INVALID;
 460                 goto done;
 461         }
 462
 463         /* Make sure we left the space for fd mappings */
 464         g_assert (handle_idx >= _wapi_fd_reserve);
 465
 466         handle = GUINT_TO_POINTER (handle_idx);
 467
 468 #ifdef DEBUG
 469         g_message ("%s: Allocated new handle %p", __func__, handle);
 470 #endif
 471
 472         if (_WAPI_SHARED_HANDLE(type)) {
 473                 /* Add the shared section too */
 474                 guint32 ref;
 475
 476                 ref = _wapi_handle_new_shared (type, handle_specific);
 477                 if (ref == 0) {
 478                         _wapi_handle_collect ();
 479                         ref = _wapi_handle_new_shared (type, handle_specific);
 480                         if (ref == 0) {
 481                                 /* FIXME: grow the arrays */
 482                                 handle = _WAPI_HANDLE_INVALID;
 483                                 goto done;
 484                         }
 485                 }
 486
 487                 _WAPI_PRIVATE_HANDLES(handle_idx).u.shared.offset = ref;
 488 #ifdef DEBUG
 489                 g_message ("%s: New shared handle at offset 0x%x", __func__,
 490                            ref);
 491 #endif
 492         }
 493
 494 done:
 495         return(handle);
 496 }
 497
 498 gpointer _wapi_handle_new (WapiHandleType type, gpointer handle_specific)
 499 {
 500         g_assert (_wapi_has_shut_down == FALSE);
 501
 502         mono_once (&shared_init_once, shared_init);
 503
 504         return _wapi_handle_real_new (type, handle_specific);
 505 }
 506
 507 gpointer _wapi_handle_new_from_offset (WapiHandleType type, guint32 offset,
 508                                        gboolean timestamp)
 509 {
 510         guint32 handle_idx = 0;
 511         gpointer handle = INVALID_HANDLE_VALUE;
 512         int thr_ret, i, k;
 513         struct _WapiHandleShared *shared;
 514         guint32 now = (guint32)(time (NULL) & 0xFFFFFFFF);
 515
 516         g_assert (_wapi_has_shut_down == FALSE);
 517
 518         mono_once (&shared_init_once, shared_init);
 519
 520 #ifdef DEBUG
 521         g_message ("%s: Creating new handle of type %s to offset %d", __func__,
 522                    _wapi_handle_typename[type], offset);
 523 #endif
 524
 525         g_assert(!_WAPI_FD_HANDLE(type));
 526         g_assert(_WAPI_SHARED_HANDLE(type));
 527         g_assert(offset != 0);
 528
 529         shared = &_wapi_shared_layout->handles[offset];
 530         if (timestamp) {
 531                 /* Bump up the timestamp for this offset */
 532                 InterlockedExchange ((gint32 *)&shared->timestamp, now);
 533         }
 534
 535         pthread_cleanup_push ((void(*)(void *))mono_mutex_unlock_in_cleanup,
 536                               (void *)&scan_mutex);
 537         thr_ret = mono_mutex_lock (&scan_mutex);
 538         g_assert (thr_ret == 0);
 539
 540         for (i = SLOT_INDEX (0); i < _wapi_private_handle_slot_count; i++) {
 541                 if (_wapi_private_handles [i]) {
 542                         for (k = SLOT_OFFSET (0); k < _WAPI_HANDLE_INITIAL_COUNT; k++) {
 543                                 struct _WapiHandleUnshared *handle_data = &_wapi_private_handles [i][k];
 544
 545                                 if (handle_data->type == type &&
 546                                         handle_data->u.shared.offset == offset) {
 547                                         handle = GUINT_TO_POINTER (i * _WAPI_HANDLE_INITIAL_COUNT + k);
 548                                         goto first_pass_done;
 549                                 }
 550                         }
 551                 }
 552         }
 553
 554 first_pass_done:
 555         thr_ret = mono_mutex_unlock (&scan_mutex);
 556         g_assert (thr_ret == 0);
 557         pthread_cleanup_pop (0);
 558
 559         if (handle != INVALID_HANDLE_VALUE) {
 560                 _wapi_handle_ref (handle);
 561
 562 #ifdef DEBUG
 563                 g_message ("%s: Returning old handle %p referencing 0x%x",
 564                            __func__, handle, offset);
 565 #endif
 566                 return (handle);
 567         }
 568
 569         /* Prevent entries expiring under us as we search */
 570         thr_ret = _wapi_handle_lock_shared_handles ();
 571         g_assert (thr_ret == 0);
 572
 573         if (shared->type == WAPI_HANDLE_UNUSED) {
 574                 /* Someone deleted this handle while we were working */
 575 #ifdef DEBUG
 576                 g_message ("%s: Handle at 0x%x unused", __func__, offset);
 577 #endif
 578                 goto done;
 579         }
 580
 581         if (shared->type != type) {
 582 #ifdef DEBUG
 583                 g_message ("%s: Wrong type at %d 0x%x! Found %s wanted %s",
 584                            __func__, offset, offset,
 585                            _wapi_handle_typename[shared->type],
 586                            _wapi_handle_typename[type]);
 587 #endif
 588                 goto done;
 589         }
 590
 591         pthread_cleanup_push ((void(*)(void *))mono_mutex_unlock_in_cleanup,
 592                               (void *)&scan_mutex);
 593         thr_ret = mono_mutex_lock (&scan_mutex);
 594         g_assert (thr_ret == 0);
 595
 596         while ((handle_idx = _wapi_handle_new_internal (type, NULL)) == 0) {
 597                 /* Try and expand the array, and have another go */
 598                 int idx = SLOT_INDEX (_wapi_private_handle_count);
 599                 _wapi_private_handles [idx] = g_new0 (struct _WapiHandleUnshared,
 600                                                 _WAPI_HANDLE_INITIAL_COUNT);
 601
 602                 _wapi_private_handle_count += _WAPI_HANDLE_INITIAL_COUNT;
 603                 _wapi_private_handle_slot_count ++;
 604         }
 605
 606         thr_ret = mono_mutex_unlock (&scan_mutex);
 607         g_assert (thr_ret == 0);
 608         pthread_cleanup_pop (0);
 609
 610         /* Make sure we left the space for fd mappings */
 611         g_assert (handle_idx >= _wapi_fd_reserve);
 612
 613         handle = GUINT_TO_POINTER (handle_idx);
 614
 615         _WAPI_PRIVATE_HANDLES(handle_idx).u.shared.offset = offset;
 616         InterlockedIncrement ((gint32 *)&shared->handle_refs);
 617
 618 #ifdef DEBUG
 619         g_message ("%s: Allocated new handle %p referencing 0x%x (shared refs %d)", __func__, handle, offset, shared->handle_refs);
 620 #endif
 621
 622 done:
 623         _wapi_handle_unlock_shared_handles ();
 624
 625         return(handle);
 626 }
 627
 628 static void
 629 init_handles_slot (int idx)
 630 {
 631         int thr_ret;
 632
 633         pthread_cleanup_push ((void(*)(void *))mono_mutex_unlock_in_cleanup,
 634                                                   (void *)&scan_mutex);
 635         thr_ret = mono_mutex_lock (&scan_mutex);
 636         g_assert (thr_ret == 0);
 637
 638         if (_wapi_private_handles [idx] == NULL) {
 639                 _wapi_private_handles [idx] = g_new0 (struct _WapiHandleUnshared,
 640                                                                                           _WAPI_HANDLE_INITIAL_COUNT);
 641                 g_assert (_wapi_private_handles [idx]);
 642         }
 643
 644         thr_ret = mono_mutex_unlock (&scan_mutex);
 645         g_assert (thr_ret == 0);
 646         pthread_cleanup_pop (0);
 647 }
 648
 649 gpointer _wapi_handle_new_fd (WapiHandleType type, int fd,
 650                               gpointer handle_specific)
 651 {
 652         struct _WapiHandleUnshared *handle;
 653         int thr_ret;
 654
 655         g_assert (_wapi_has_shut_down == FALSE);
 656
 657         mono_once (&shared_init_once, shared_init);
 658
 659 #ifdef DEBUG
 660         g_message ("%s: Creating new handle of type %s", __func__,
 661                    _wapi_handle_typename[type]);
 662 #endif
 663
 664         g_assert(_WAPI_FD_HANDLE(type));
 665         g_assert(!_WAPI_SHARED_HANDLE(type));
 666
 667         if (fd >= _wapi_fd_reserve) {
 668 #ifdef DEBUG
 669                 g_message ("%s: fd %d is too big", __func__, fd);
 670 #endif
 671
 672                 return(GUINT_TO_POINTER (_WAPI_HANDLE_INVALID));
 673         }
 674
 675         /* Initialize the array entries on demand */
 676         if (_wapi_private_handles [SLOT_INDEX (fd)] == NULL)
 677                 init_handles_slot (SLOT_INDEX (fd));
 678
 679         handle = &_WAPI_PRIVATE_HANDLES(fd);
 680
 681         if (handle->type != WAPI_HANDLE_UNUSED) {
 682 #ifdef DEBUG
 683                 g_message ("%s: fd %d is already in use!", __func__, fd);
 684 #endif
 685                 /* FIXME: clean up this handle?  We can't do anything
 686                  * with the fd, cos thats the new one
 687                  */
 688         }
 689
 690 #ifdef DEBUG
 691         g_message ("%s: Assigning new fd handle %d", __func__, fd);
 692 #endif
 693
 694         /* Prevent file share entries racing with us, when the file
 695          * handle is only half initialised
 696          */
 697         thr_ret = _wapi_shm_sem_lock (_WAPI_SHARED_SEM_FILESHARE);
 698         g_assert(thr_ret == 0);
 699
 700         _wapi_handle_init (handle, type, handle_specific);
 701
 702         thr_ret = _wapi_shm_sem_unlock (_WAPI_SHARED_SEM_FILESHARE);
 703
 704         return(GUINT_TO_POINTER(fd));
 705 }
 706
 707 gboolean _wapi_lookup_handle (gpointer handle, WapiHandleType type,
 708                               gpointer *handle_specific)
 709 {
 710         struct _WapiHandleUnshared *handle_data;
 711         guint32 handle_idx = GPOINTER_TO_UINT(handle);
 712
 713         if (!_WAPI_PRIVATE_VALID_SLOT (handle_idx)) {
 714                 return(FALSE);
 715         }
 716
 717         /* Initialize the array entries on demand */
 718         if (_wapi_private_handles [SLOT_INDEX (handle_idx)] == NULL)
 719                 init_handles_slot (SLOT_INDEX (handle_idx));
 720
 721         handle_data = &_WAPI_PRIVATE_HANDLES(handle_idx);
 722
 723         if (handle_data->type != type) {
 724                 return(FALSE);
 725         }
 726
 727         if (handle_specific == NULL) {
 728                 return(FALSE);
 729         }
 730
 731         if (_WAPI_SHARED_HANDLE(type)) {
 732                 struct _WapiHandle_shared_ref *ref;
 733                 struct _WapiHandleShared *shared_handle_data;
 734
 735                 ref = &handle_data->u.shared;
 736                 shared_handle_data = &_wapi_shared_layout->handles[ref->offset];
 737
 738                 if (shared_handle_data->type != type) {
 739                         /* The handle must have been deleted on us
 740                          */
 741                         return (FALSE);
 742                 }
 743
 744                 *handle_specific = &shared_handle_data->u;
 745         } else {
 746                 *handle_specific = &handle_data->u;
 747         }
 748
 749         return(TRUE);
 750 }
 751
 752 void
 753 _wapi_handle_foreach (WapiHandleType type,
 754                         gboolean (*on_each)(gpointer test, gpointer user),
 755                         gpointer user_data)
 756 {
 757         struct _WapiHandleUnshared *handle_data = NULL;
 758         gpointer ret = NULL;
 759         guint32 i, k;
 760         int thr_ret;
 761
 762         pthread_cleanup_push ((void(*)(void *))mono_mutex_unlock_in_cleanup,
 763                               (void *)&scan_mutex);
 764         thr_ret = mono_mutex_lock (&scan_mutex);
 765         g_assert (thr_ret == 0);
 766
 767         for (i = SLOT_INDEX (0); i < _wapi_private_handle_slot_count; i++) {
 768                 if (_wapi_private_handles [i]) {
 769                         for (k = SLOT_OFFSET (0); k < _WAPI_HANDLE_INITIAL_COUNT; k++) {
 770                                 handle_data = &_wapi_private_handles [i][k];
 771
 772                                 if (handle_data->type == type) {
 773                                         ret = GUINT_TO_POINTER (i * _WAPI_HANDLE_INITIAL_COUNT + k);
 774                                         if (on_each (ret, user_data) == TRUE)
 775                                                 break;
 776                                 }
 777                         }
 778                 }
 779         }
 780
 781         thr_ret = mono_mutex_unlock (&scan_mutex);
 782         g_assert (thr_ret == 0);
 783         pthread_cleanup_pop (0);
 784 }
 785
 786 /* This might list some shared handles twice if they are already
 787  * opened by this process, and the check function returns FALSE the
 788  * first time.  Shared handles that are created during the search are
 789  * unreffed if the check function returns FALSE, so callers must not
 790  * rely on the handle persisting (unless the check function returns
 791  * TRUE)
 792  */
 793 gpointer _wapi_search_handle (WapiHandleType type,
 794                               gboolean (*check)(gpointer test, gpointer user),
 795                               gpointer user_data,
 796                               gpointer *handle_specific,
 797                               gboolean search_shared)
 798 {
 799         struct _WapiHandleUnshared *handle_data = NULL;
 800         struct _WapiHandleShared *shared = NULL;
 801         gpointer ret = NULL;
 802         guint32 i, k;
 803         gboolean found = FALSE;
 804         int thr_ret;
 805
 806         pthread_cleanup_push ((void(*)(void *))mono_mutex_unlock_in_cleanup,
 807                               (void *)&scan_mutex);
 808         thr_ret = mono_mutex_lock (&scan_mutex);
 809         g_assert (thr_ret == 0);
 810
 811         for (i = SLOT_INDEX (0); !found && i < _wapi_private_handle_slot_count; i++) {
 812                 if (_wapi_private_handles [i]) {
 813                         for (k = SLOT_OFFSET (0); k < _WAPI_HANDLE_INITIAL_COUNT; k++) {
 814                                 handle_data = &_wapi_private_handles [i][k];
 815
 816                                 if (handle_data->type == type) {
 817                                         ret = GUINT_TO_POINTER (i * _WAPI_HANDLE_INITIAL_COUNT + k);
 818                                         if (check (ret, user_data) == TRUE) {
 819                                                 _wapi_handle_ref (ret);
 820                                                 found = TRUE;
 821
 822                                                 if (_WAPI_SHARED_HANDLE (type)) {
 823                                                         shared = &_wapi_shared_layout->handles[i];
 824                                                 }
 825
 826                                                 break;
 827                                         }
 828                                 }
 829                         }
 830                 }
 831         }
 832
 833         thr_ret = mono_mutex_unlock (&scan_mutex);
 834         g_assert (thr_ret == 0);
 835         pthread_cleanup_pop (0);
 836
 837         if (!found && search_shared && _WAPI_SHARED_HANDLE (type)) {
 838                 /* Not found yet, so search the shared memory too */
 839 #ifdef DEBUG
 840                 g_message ("%s: Looking at other shared handles...", __func__);
 841 #endif
 842
 843                 for (i = 0; i < _WAPI_HANDLE_INITIAL_COUNT; i++) {
 844                         shared = &_wapi_shared_layout->handles[i];
 845
 846                         if (shared->type == type) {
 847                                 /* Tell new_from_offset to not
 848                                  * timestamp this handle, because
 849                                  * otherwise it will ping every handle
 850                                  * in the list and they will never
 851                                  * expire
 852                                  */
 853                                 ret = _wapi_handle_new_from_offset (type, i,
 854                                                                     FALSE);
 855                                 if (ret == INVALID_HANDLE_VALUE) {
 856                                         /* This handle was deleted
 857                                          * while we were looking at it
 858                                          */
 859                                         continue;
 860                                 }
 861
 862 #ifdef DEBUG
 863                                 g_message ("%s: Opened tmp handle %p (type %s) from offset %d", __func__, ret, _wapi_handle_typename[type], i);
 864 #endif
 865
 866                                 /* It's possible that the shared part
 867                                  * of this handle has now been blown
 868                                  * away (after new_from_offset
 869                                  * successfully opened it,) if its
 870                                  * timestamp is too old.  The check
 871                                  * function needs to be aware of this,
 872                                  * and cope if the handle has
 873                                  * vanished.
 874                                  */
 875                                 if (check (ret, user_data) == TRUE) {
 876                                         /* Timestamp this handle, but make
 877                                          * sure it still exists first
 878                                          */
 879                                         thr_ret = _wapi_handle_lock_shared_handles ();
 880                                         g_assert (thr_ret == 0);
 881
 882                                         if (shared->type == type) {
 883                                                 guint32 now = (guint32)(time (NULL) & 0xFFFFFFFF);
 884                                                 InterlockedExchange ((gint32 *)&shared->timestamp, now);
 885
 886                                                 found = TRUE;
 887                                                 handle_data = &_WAPI_PRIVATE_HANDLES(GPOINTER_TO_UINT(ret));
 888
 889                                                 _wapi_handle_unlock_shared_handles ();
 890                                                 break;
 891                                         } else {
 892                                                 /* It's been deleted,
 893                                                  * so just keep
 894                                                  * looking
 895                                                  */
 896                                                 _wapi_handle_unlock_shared_handles ();
 897                                         }
 898                                 }
 899
 900                                 /* This isn't the handle we're looking
 901                                  * for, so drop the reference we took
 902                                  * in _wapi_handle_new_from_offset ()
 903                                  */
 904                                 _wapi_handle_unref (ret);
 905                         }
 906                 }
 907         }
 908
 909         if (!found) {
 910                 ret = NULL;
 911                 goto done;
 912         }
 913
 914         if(handle_specific != NULL) {
 915                 if (_WAPI_SHARED_HANDLE(type)) {
 916                         g_assert(shared->type == type);
 917
 918                         *handle_specific = &shared->u;
 919                 } else {
 920                         *handle_specific = &handle_data->u;
 921                 }
 922         }
 923
 924 done:
 925         return(ret);
 926 }
 927
 928 /* Returns the offset of the metadata array, or -1 on error, or 0 for
 929  * not found (0 is not a valid offset)
 930  */
 931 gint32 _wapi_search_handle_namespace (WapiHandleType type,
 932                                       gchar *utf8_name)
 933 {
 934         struct _WapiHandleShared *shared_handle_data;
 935         guint32 i;
 936         gint32 ret = 0;
 937         int thr_ret;
 938
 939         g_assert(_WAPI_SHARED_HANDLE(type));
 940
 941 #ifdef DEBUG
 942         g_message ("%s: Lookup for handle named [%s] type %s", __func__,
 943                    utf8_name, _wapi_handle_typename[type]);
 944 #endif
 945
 946         /* Do a handle collection before starting to look, so that any
 947          * stale cruft gets removed
 948          */
 949         _wapi_handle_collect ();
 950
 951         thr_ret = _wapi_handle_lock_shared_handles ();
 952         g_assert (thr_ret == 0);
 953
 954         for(i = 1; i < _WAPI_HANDLE_INITIAL_COUNT; i++) {
 955                 WapiSharedNamespace *sharedns;
 956
 957                 shared_handle_data = &_wapi_shared_layout->handles[i];
 958
 959                 /* Check mutex, event, semaphore, timer, job and
 960                  * file-mapping object names.  So far only mutex,
 961                  * semaphore and event are implemented.
 962                  */
 963                 if (!_WAPI_SHARED_NAMESPACE (shared_handle_data->type)) {
 964                         continue;
 965                 }
 966
 967 #ifdef DEBUG
 968                 g_message ("%s: found a shared namespace handle at 0x%x (type %s)", __func__, i, _wapi_handle_typename[shared_handle_data->type]);
 969 #endif
 970
 971                 sharedns=(WapiSharedNamespace *)&shared_handle_data->u;
 972
 973 #ifdef DEBUG
 974                 g_message ("%s: name is [%s]", __func__, sharedns->name);
 975 #endif
 976
 977                 if (strcmp (sharedns->name, utf8_name) == 0) {
 978                         if (shared_handle_data->type != type) {
 979                                 /* Its the wrong type, so fail now */
 980 #ifdef DEBUG
 981                                 g_message ("%s: handle 0x%x matches name but is wrong type: %s", __func__, i, _wapi_handle_typename[shared_handle_data->type]);
 982 #endif
 983                                 ret = -1;
 984                                 goto done;
 985                         } else {
 986 #ifdef DEBUG
 987                                 g_message ("%s: handle 0x%x matches name and type", __func__, i);
 988 #endif
 989                                 ret = i;
 990                                 goto done;
 991                         }
 992                 }
 993         }
 994
 995 done:
 996         _wapi_handle_unlock_shared_handles ();
 997
 998         return(ret);
 999 }
1000
1001 void _wapi_handle_ref (gpointer handle)
1002 {
1003         guint32 idx = GPOINTER_TO_UINT(handle);
1004         guint32 now = (guint32)(time (NULL) & 0xFFFFFFFF);
1005         struct _WapiHandleUnshared *handle_data;
1006
1007         if (!_WAPI_PRIVATE_VALID_SLOT (idx)) {
1008                 return;
1009         }
1010
1011         if (_wapi_handle_type (handle) == WAPI_HANDLE_UNUSED) {
1012                 g_warning ("%s: Attempting to ref unused handle %p", __func__,
1013                            handle);
1014                 return;
1015         }
1016
1017         handle_data = &_WAPI_PRIVATE_HANDLES(idx);
1018
1019         InterlockedIncrement ((gint32 *)&handle_data->ref);
1020
1021         /* It's possible for processes to exit before getting around
1022          * to updating timestamps in the collection thread, so if a
1023          * shared handle is reffed do the timestamp here as well just
1024          * to make sure.
1025          */
1026         if (_WAPI_SHARED_HANDLE(handle_data->type)) {
1027                 struct _WapiHandleShared *shared_data = &_wapi_shared_layout->handles[handle_data->u.shared.offset];
1028
1029                 InterlockedExchange ((gint32 *)&shared_data->timestamp, now);
1030         }
1031
1032 #ifdef DEBUG_REFS
1033         g_message ("%s: %s handle %p ref now %d", __func__,
1034                    _wapi_handle_typename[_WAPI_PRIVATE_HANDLES (idx).type],
1035                    handle,
1036                    _WAPI_PRIVATE_HANDLES(idx).ref);
1037 #endif
1038 }
1039
1040 /* The handle must not be locked on entry to this function */
1041 void _wapi_handle_unref (gpointer handle)
1042 {
1043         guint32 idx = GPOINTER_TO_UINT(handle);
1044         gboolean destroy = FALSE;
1045         int thr_ret;
1046
1047         if (!_WAPI_PRIVATE_VALID_SLOT (idx)) {
1048                 return;
1049         }
1050
1051         if (_wapi_handle_type (handle) == WAPI_HANDLE_UNUSED) {
1052                 g_warning ("%s: Attempting to unref unused handle %p",
1053                            __func__, handle);
1054                 return;
1055         }
1056
1057         /* Possible race condition here if another thread refs the
1058          * handle between here and setting the type to UNUSED.  I
1059          * could lock a mutex, but I'm not sure that allowing a handle
1060          * reference to reach 0 isn't an application bug anyway.
1061          */
1062         destroy = (InterlockedDecrement ((gint32 *)&_WAPI_PRIVATE_HANDLES(idx).ref) ==0);
1063
1064 #ifdef DEBUG_REFS
1065         g_message ("%s: %s handle %p ref now %d (destroy %s)", __func__,
1066                    _wapi_handle_typename[_WAPI_PRIVATE_HANDLES (idx).type],
1067                    handle,
1068                    _WAPI_PRIVATE_HANDLES(idx).ref, destroy?"TRUE":"FALSE");
1069 #endif
1070
1071         if(destroy==TRUE) {
1072                 /* Need to copy the handle info, reset the slot in the
1073                  * array, and _only then_ call the close function to
1074                  * avoid race conditions (eg file descriptors being
1075                  * closed, and another file being opened getting the
1076                  * same fd racing the memset())
1077                  */
1078                 struct _WapiHandleUnshared handle_data;
1079                 struct _WapiHandleShared shared_handle_data;
1080                 WapiHandleType type = _WAPI_PRIVATE_HANDLES(idx).type;
1081                 void (*close_func)(gpointer, gpointer) = _wapi_handle_ops_get_close_func (type);
1082                 gboolean is_shared = _WAPI_SHARED_HANDLE(type);
1083
1084                 if (is_shared) {
1085                         /* If this is a shared handle we need to take
1086                          * the shared lock outside of the scan_mutex
1087                          * lock to avoid deadlocks
1088                          */
1089                         thr_ret = _wapi_handle_lock_shared_handles ();
1090                         g_assert (thr_ret == 0);
1091                 }
1092
1093                 pthread_cleanup_push ((void(*)(void *))mono_mutex_unlock_in_cleanup, (void *)&scan_mutex);
1094                 thr_ret = mono_mutex_lock (&scan_mutex);
1095
1096 #ifdef DEBUG
1097                 g_message ("%s: Destroying handle %p", __func__, handle);
1098 #endif
1099
1100                 memcpy (&handle_data, &_WAPI_PRIVATE_HANDLES(idx),
1101                         sizeof (struct _WapiHandleUnshared));
1102
1103                 memset (&_WAPI_PRIVATE_HANDLES(idx).u, '\0',
1104                         sizeof(_WAPI_PRIVATE_HANDLES(idx).u));
1105
1106                 _WAPI_PRIVATE_HANDLES(idx).type = WAPI_HANDLE_UNUSED;
1107
1108                 if (!is_shared) {
1109                         /* Destroy the mutex and cond var.  We hope nobody
1110                          * tried to grab them between the handle unlock and
1111                          * now, but pthreads doesn't have a
1112                          * "unlock_and_destroy" atomic function.
1113                          */
1114                         thr_ret = mono_mutex_destroy (&_WAPI_PRIVATE_HANDLES(idx).signal_mutex);
1115                         g_assert (thr_ret == 0);
1116
1117                         thr_ret = pthread_cond_destroy (&_WAPI_PRIVATE_HANDLES(idx).signal_cond);
1118                         g_assert (thr_ret == 0);
1119                 } else {
1120                         struct _WapiHandleShared *shared = &_wapi_shared_layout->handles[handle_data.u.shared.offset];
1121
1122                         memcpy (&shared_handle_data, shared,
1123                                 sizeof (struct _WapiHandleShared));
1124
1125                         /* It's possible that this handle is already
1126                          * pointing at a deleted shared section
1127                          */
1128 #ifdef DEBUG_REFS
1129                         g_message ("%s: %s handle %p shared refs before dec %d", __func__, _wapi_handle_typename[type], handle, shared->handle_refs);
1130 #endif
1131
1132                         if (shared->handle_refs > 0) {
1133                                 shared->handle_refs--;
1134                                 if (shared->handle_refs == 0) {
1135                                         memset (shared, '\0', sizeof (struct _WapiHandleShared));
1136                                 }
1137                         }
1138                 }
1139
1140                 thr_ret = mono_mutex_unlock (&scan_mutex);
1141                 g_assert (thr_ret == 0);
1142                 pthread_cleanup_pop (0);
1143
1144                 if (is_shared) {
1145                         _wapi_handle_unlock_shared_handles ();
1146                 }
1147
1148                 if (close_func != NULL) {
1149                         if (is_shared) {
1150                                 close_func (handle, &shared_handle_data.u);
1151                         } else {
1152                                 close_func (handle, &handle_data.u);
1153                         }
1154                 }
1155         }
1156 }
1157
1158 void _wapi_handle_register_capabilities (WapiHandleType type,
1159                                          WapiHandleCapability caps)
1160 {
1161         handle_caps[type] = caps;
1162 }
1163
1164 gboolean _wapi_handle_test_capabilities (gpointer handle,
1165                                          WapiHandleCapability caps)
1166 {
1167         guint32 idx = GPOINTER_TO_UINT(handle);
1168         WapiHandleType type;
1169
1170         if (!_WAPI_PRIVATE_VALID_SLOT (idx)) {
1171                 return(FALSE);
1172         }
1173
1174         type = _WAPI_PRIVATE_HANDLES(idx).type;
1175
1176 #ifdef DEBUG
1177         g_message ("%s: testing 0x%x against 0x%x (%d)", __func__,
1178                    handle_caps[type], caps, handle_caps[type] & caps);
1179 #endif
1180
1181         return((handle_caps[type] & caps) != 0);
1182 }
1183
1184 static void (*_wapi_handle_ops_get_close_func (WapiHandleType type))(gpointer, gpointer)
1185 {
1186         if (handle_ops[type] != NULL &&
1187             handle_ops[type]->close != NULL) {
1188                 return (handle_ops[type]->close);
1189         }
1190
1191         return (NULL);
1192 }
1193
1194 void _wapi_handle_ops_close (gpointer handle, gpointer data)
1195 {
1196         guint32 idx = GPOINTER_TO_UINT(handle);
1197         WapiHandleType type;
1198
1199         if (!_WAPI_PRIVATE_VALID_SLOT (idx)) {
1200                 return;
1201         }
1202
1203         type = _WAPI_PRIVATE_HANDLES(idx).type;
1204
1205         if (handle_ops[type] != NULL &&
1206             handle_ops[type]->close != NULL) {
1207                 handle_ops[type]->close (handle, data);
1208         }
1209 }
1210
1211 void _wapi_handle_ops_signal (gpointer handle)
1212 {
1213         guint32 idx = GPOINTER_TO_UINT(handle);
1214         WapiHandleType type;
1215
1216         if (!_WAPI_PRIVATE_VALID_SLOT (idx)) {
1217                 return;
1218         }
1219
1220         type = _WAPI_PRIVATE_HANDLES(idx).type;
1221
1222         if (handle_ops[type] != NULL && handle_ops[type]->signal != NULL) {
1223                 handle_ops[type]->signal (handle);
1224         }
1225 }
1226
1227 gboolean _wapi_handle_ops_own (gpointer handle)
1228 {
1229         guint32 idx = GPOINTER_TO_UINT(handle);
1230         WapiHandleType type;
1231
1232         if (!_WAPI_PRIVATE_VALID_SLOT (idx)) {
1233                 return(FALSE);
1234         }
1235
1236         type = _WAPI_PRIVATE_HANDLES(idx).type;
1237
1238         if (handle_ops[type] != NULL && handle_ops[type]->own_handle != NULL) {
1239                 return(handle_ops[type]->own_handle (handle));
1240         } else {
1241                 return(FALSE);
1242         }
1243 }
1244
1245 gboolean _wapi_handle_ops_isowned (gpointer handle)
1246 {
1247         guint32 idx = GPOINTER_TO_UINT(handle);
1248         WapiHandleType type;
1249
1250         if (!_WAPI_PRIVATE_VALID_SLOT (idx)) {
1251                 return(FALSE);
1252         }
1253
1254         type = _WAPI_PRIVATE_HANDLES(idx).type;
1255
1256         if (handle_ops[type] != NULL && handle_ops[type]->is_owned != NULL) {
1257                 return(handle_ops[type]->is_owned (handle));
1258         } else {
1259                 return(FALSE);
1260         }
1261 }
1262
1263 guint32 _wapi_handle_ops_special_wait (gpointer handle, guint32 timeout)
1264 {
1265         guint32 idx = GPOINTER_TO_UINT(handle);
1266         WapiHandleType type;
1267
1268         if (!_WAPI_PRIVATE_VALID_SLOT (idx)) {
1269                 return(WAIT_FAILED);
1270         }
1271
1272         type = _WAPI_PRIVATE_HANDLES(idx).type;
1273
1274         if (handle_ops[type] != NULL &&
1275             handle_ops[type]->special_wait != NULL) {
1276                 return(handle_ops[type]->special_wait (handle, timeout));
1277         } else {
1278                 return(WAIT_FAILED);
1279         }
1280 }
1281
1282 void _wapi_handle_ops_prewait (gpointer handle)
1283 {
1284         guint32 idx = GPOINTER_TO_UINT (handle);
1285         WapiHandleType type;
1286
1287         if (!_WAPI_PRIVATE_VALID_SLOT (idx)) {
1288                 return;
1289         }
1290
1291         type = _WAPI_PRIVATE_HANDLES (idx).type;
1292
1293         if (handle_ops[type] != NULL &&
1294             handle_ops[type]->prewait != NULL) {
1295                 handle_ops[type]->prewait (handle);
1296         }
1297 }
1298
1299
1300 /**
1301  * CloseHandle:
1302  * @handle: The handle to release
1303  *
1304  * Closes and invalidates @handle, releasing any resources it
1305  * consumes.  When the last handle to a temporary or non-persistent
1306  * object is closed, that object can be deleted.  Closing the same
1307  * handle twice is an error.
1308  *
1309  * Return value: %TRUE on success, %FALSE otherwise.
1310  */
1311 gboolean CloseHandle(gpointer handle)
1312 {
1313         if (handle == NULL) {
1314                 /* Problem: because we map file descriptors to the
1315                  * same-numbered handle we can't tell the difference
1316                  * between a bogus handle and the handle to stdin.
1317                  * Assume that it's the console handle if that handle
1318                  * exists...
1319                  */
1320                 if (_WAPI_PRIVATE_HANDLES (0).type != WAPI_HANDLE_CONSOLE) {
1321                         SetLastError (ERROR_INVALID_PARAMETER);
1322                         return(FALSE);
1323                 }
1324         }
1325         if (handle == _WAPI_HANDLE_INVALID){
1326                 SetLastError (ERROR_INVALID_PARAMETER);
1327                 return(FALSE);
1328         }
1329
1330         _wapi_handle_unref (handle);
1331
1332         return(TRUE);
1333 }
1334
1335 /* Lots more to implement here, but this is all we need at the moment */
1336 gboolean DuplicateHandle (gpointer srcprocess, gpointer src,
1337                           gpointer targetprocess, gpointer *target,
1338                           guint32 access G_GNUC_UNUSED, gboolean inherit G_GNUC_UNUSED, guint32 options G_GNUC_UNUSED)
1339 {
1340         if (srcprocess != _WAPI_PROCESS_CURRENT ||
1341             targetprocess != _WAPI_PROCESS_CURRENT) {
1342                 /* Duplicating other process's handles is not supported */
1343                 SetLastError (ERROR_INVALID_HANDLE);
1344                 return(FALSE);
1345         }
1346
1347         if (src == _WAPI_PROCESS_CURRENT) {
1348                 *target = _wapi_process_duplicate ();
1349         } else if (src == _WAPI_THREAD_CURRENT) {
1350                 *target = _wapi_thread_duplicate ();
1351         } else {
1352                 _wapi_handle_ref (src);
1353                 *target = src;
1354         }
1355
1356         return(TRUE);
1357 }
1358
1359 gboolean _wapi_handle_count_signalled_handles (guint32 numhandles,
1360                                                gpointer *handles,
1361                                                gboolean waitall,
1362                                                guint32 *retcount,
1363                                                guint32 *lowest)
1364 {
1365         guint32 count, i, iter=0;
1366         gboolean ret;
1367         int thr_ret;
1368         WapiHandleType type;
1369
1370         /* Lock all the handles, with backoff */
1371 again:
1372         thr_ret = _wapi_handle_lock_shared_handles ();
1373         g_assert (thr_ret == 0);
1374
1375         for(i=0; i<numhandles; i++) {
1376                 gpointer handle = handles[i];
1377                 guint32 idx = GPOINTER_TO_UINT(handle);
1378
1379 #ifdef DEBUG
1380                 g_message ("%s: attempting to lock %p", __func__, handle);
1381 #endif
1382
1383                 type = _WAPI_PRIVATE_HANDLES(idx).type;
1384
1385                 thr_ret = _wapi_handle_trylock_handle (handle);
1386
1387                 if (thr_ret != 0) {
1388                         /* Bummer */
1389
1390 #ifdef DEBUG
1391                         g_message ("%s: attempt failed for %p: %s", __func__,
1392                                    handle, strerror (thr_ret));
1393 #endif
1394
1395                         thr_ret = _wapi_handle_unlock_shared_handles ();
1396                         g_assert (thr_ret == 0);
1397
1398                         while (i--) {
1399                                 handle = handles[i];
1400                                 idx = GPOINTER_TO_UINT(handle);
1401
1402                                 thr_ret = _wapi_handle_unlock_handle (handle);
1403                                 g_assert (thr_ret == 0);
1404                         }
1405
1406                         /* If iter ever reaches 100 the nanosleep will
1407                          * return EINVAL immediately, but we have a
1408                          * design flaw if that happens.
1409                          */
1410                         iter++;
1411                         if(iter==100) {
1412                                 g_warning ("%s: iteration overflow!",
1413                                            __func__);
1414                                 iter=1;
1415                         }
1416
1417 #ifdef DEBUG
1418                         g_message ("%s: Backing off for %d ms", __func__,
1419                                    iter*10);
1420 #endif
1421                         _wapi_handle_spin (10 * iter);
1422
1423                         goto again;
1424                 }
1425         }
1426
1427 #ifdef DEBUG
1428         g_message ("%s: Locked all handles", __func__);
1429 #endif
1430
1431         count=0;
1432         *lowest=numhandles;
1433
1434         for(i=0; i<numhandles; i++) {
1435                 gpointer handle = handles[i];
1436                 guint32 idx = GPOINTER_TO_UINT(handle);
1437
1438                 type = _WAPI_PRIVATE_HANDLES(idx).type;
1439
1440 #ifdef DEBUG
1441                 g_message ("%s: Checking handle %p", __func__, handle);
1442 #endif
1443
1444                 if(((_wapi_handle_test_capabilities (handle, WAPI_HANDLE_CAP_OWN)==TRUE) &&
1445                     (_wapi_handle_ops_isowned (handle) == TRUE)) ||
1446                    (_WAPI_SHARED_HANDLE(type) &&
1447                     WAPI_SHARED_HANDLE_DATA(handle).signalled == TRUE) ||
1448                    (!_WAPI_SHARED_HANDLE(type) &&
1449                     _WAPI_PRIVATE_HANDLES(idx).signalled == TRUE)) {
1450                         count++;
1451
1452 #ifdef DEBUG
1453                         g_message ("%s: Handle %p signalled", __func__,
1454                                    handle);
1455 #endif
1456                         if(*lowest>i) {
1457                                 *lowest=i;
1458                         }
1459                 }
1460         }
1461
1462 #ifdef DEBUG
1463         g_message ("%s: %d event handles signalled", __func__, count);
1464 #endif
1465
1466         if ((waitall == TRUE && count == numhandles) ||
1467             (waitall == FALSE && count > 0)) {
1468                 ret=TRUE;
1469         } else {
1470                 ret=FALSE;
1471         }
1472
1473 #ifdef DEBUG
1474         g_message ("%s: Returning %d", __func__, ret);
1475 #endif
1476
1477         *retcount=count;
1478
1479         return(ret);
1480 }
1481
1482 void _wapi_handle_unlock_handles (guint32 numhandles, gpointer *handles)
1483 {
1484         guint32 i;
1485         int thr_ret;
1486
1487         thr_ret = _wapi_handle_unlock_shared_handles ();
1488         g_assert (thr_ret == 0);
1489
1490         for(i=0; i<numhandles; i++) {
1491                 gpointer handle = handles[i];
1492
1493 #ifdef DEBUG
1494                 g_message ("%s: unlocking handle %p", __func__, handle);
1495 #endif
1496
1497                 thr_ret = _wapi_handle_unlock_handle (handle);
1498                 g_assert (thr_ret == 0);
1499         }
1500 }
1501
1502 static int timedwait_signal_poll_cond (pthread_cond_t *cond, mono_mutex_t *mutex, struct timespec *timeout, gboolean alertable)
1503 {
1504         struct timespec fake_timeout;
1505         int ret;
1506
1507         if (!alertable) {
1508                 if (timeout)
1509                         ret=mono_cond_timedwait (cond, mutex, timeout);
1510                 else
1511                         ret=mono_cond_wait (cond, mutex);
1512         } else {
1513                 _wapi_calc_timeout (&fake_timeout, 100);
1514
1515                 if (timeout != NULL && ((fake_timeout.tv_sec > timeout->tv_sec) ||
1516                                                                 (fake_timeout.tv_sec == timeout->tv_sec &&
1517                                                                  fake_timeout.tv_nsec > timeout->tv_nsec))) {
1518                         /* Real timeout is less than 100ms time */
1519                         ret=mono_cond_timedwait (cond, mutex, timeout);
1520                 } else {
1521                         ret=mono_cond_timedwait (cond, mutex, &fake_timeout);
1522
1523                         /* Mask the fake timeout, this will cause
1524                          * another poll if the cond was not really signaled
1525                          */
1526                         if (ret==ETIMEDOUT) {
1527                                 ret=0;
1528                         }
1529                 }
1530         }
1531
1532         return(ret);
1533 }
1534
1535 int _wapi_handle_wait_signal (gboolean poll)
1536 {
1537         return _wapi_handle_timedwait_signal_handle (_wapi_global_signal_handle, NULL, TRUE, poll);
1538 }
1539
1540 int _wapi_handle_timedwait_signal (struct timespec *timeout, gboolean poll)
1541 {
1542         return _wapi_handle_timedwait_signal_handle (_wapi_global_signal_handle, timeout, TRUE, poll);
1543 }
1544
1545 int _wapi_handle_wait_signal_handle (gpointer handle, gboolean alertable)
1546 {
1547 #ifdef DEBUG
1548         g_message ("%s: waiting for %p", __func__, handle);
1549 #endif
1550
1551         return _wapi_handle_timedwait_signal_handle (handle, NULL, alertable, FALSE);
1552 }
1553
1554 int _wapi_handle_timedwait_signal_handle (gpointer handle,
1555                                                                                   struct timespec *timeout, gboolean alertable, gboolean poll)
1556 {
1557 #ifdef DEBUG
1558         g_message ("%s: waiting for %p (type %s)", __func__, handle,
1559                    _wapi_handle_typename[_wapi_handle_type (handle)]);
1560 #endif
1561
1562         if (_WAPI_SHARED_HANDLE (_wapi_handle_type (handle))) {
1563                 if (WAPI_SHARED_HANDLE_DATA(handle).signalled == TRUE) {
1564                         return (0);
1565                 }
1566                 if (timeout != NULL) {
1567                         struct timespec fake_timeout;
1568                         _wapi_calc_timeout (&fake_timeout, 100);
1569
1570                         if ((fake_timeout.tv_sec > timeout->tv_sec) ||
1571                                 (fake_timeout.tv_sec == timeout->tv_sec &&
1572                                  fake_timeout.tv_nsec > timeout->tv_nsec)) {
1573                                 /* FIXME: Real timeout is less than
1574                                  * 100ms time, but is it really worth
1575                                  * calculating to the exact ms?
1576                                  */
1577                                 _wapi_handle_spin (100);
1578
1579                                 if (WAPI_SHARED_HANDLE_DATA(handle).signalled == TRUE) {
1580                                         return (0);
1581                                 } else {
1582                                         return (ETIMEDOUT);
1583                                 }
1584                         }
1585                 }
1586                 _wapi_handle_spin (100);
1587                 return (0);
1588
1589         } else {
1590                 guint32 idx = GPOINTER_TO_UINT(handle);
1591                 int res;
1592                 pthread_cond_t *cond;
1593                 mono_mutex_t *mutex;
1594
1595                 if (alertable && !wapi_thread_set_wait_handle (handle))
1596                         return 0;
1597
1598                 cond = &_WAPI_PRIVATE_HANDLES (idx).signal_cond;
1599                 mutex = &_WAPI_PRIVATE_HANDLES (idx).signal_mutex;
1600
1601                 if (poll) {
1602                         /* This is needed when waiting for process handles */
1603                         res = timedwait_signal_poll_cond (cond, mutex, timeout, alertable);
1604                 } else {
1605                         if (timeout)
1606                                 res = mono_cond_timedwait (cond, mutex, timeout);
1607                         else
1608                                 res = mono_cond_wait (cond, mutex);
1609                 }
1610
1611                 if (alertable)
1612                         wapi_thread_clear_wait_handle (handle);
1613
1614                 return res;
1615         }
1616 }
1617
1618 gboolean _wapi_handle_get_or_set_share (dev_t device, ino_t inode,
1619                                         guint32 new_sharemode,
1620                                         guint32 new_access,
1621                                         guint32 *old_sharemode,
1622                                         guint32 *old_access,
1623                                         struct _WapiFileShare **share_info)
1624 {
1625         struct _WapiFileShare *file_share;
1626         guint32 now = (guint32)(time(NULL) & 0xFFFFFFFF);
1627         int thr_ret, i, first_unused = -1;
1628         gboolean exists = FALSE;
1629
1630         /* Prevents entries from expiring under us as we search
1631          */
1632         thr_ret = _wapi_handle_lock_shared_handles ();
1633         g_assert (thr_ret == 0);
1634
1635         /* Prevent new entries racing with us */
1636         thr_ret = _wapi_shm_sem_lock (_WAPI_SHARED_SEM_FILESHARE);
1637         g_assert (thr_ret == 0);
1638
1639         /* If a linear scan gets too slow we'll have to fit a hash
1640          * table onto the shared mem backing store
1641          */
1642         *share_info = NULL;
1643         for (i = 0; i <= _wapi_fileshare_layout->hwm; i++) {
1644                 file_share = &_wapi_fileshare_layout->share_info[i];
1645
1646                 /* Make a note of an unused slot, in case we need to
1647                  * store share info
1648                  */
1649                 if (first_unused == -1 && file_share->handle_refs == 0) {
1650                         first_unused = i;
1651                         continue;
1652                 }
1653
1654                 if (file_share->handle_refs == 0) {
1655                         continue;
1656                 }
1657
1658                 if (file_share->device == device &&
1659                     file_share->inode == inode) {
1660                         *old_sharemode = file_share->sharemode;
1661                         *old_access = file_share->access;
1662                         *share_info = file_share;
1663
1664                         /* Increment the reference count while we
1665                          * still have sole access to the shared area.
1666                          * This makes the increment atomic wrt
1667                          * collections
1668                          */
1669                         InterlockedIncrement ((gint32 *)&file_share->handle_refs);
1670
1671                         exists = TRUE;
1672                         break;
1673                 }
1674         }
1675
1676         if (!exists) {
1677                 if (i == _WAPI_FILESHARE_SIZE && first_unused == -1) {
1678                         /* No more space */
1679                 } else {
1680                         if (first_unused == -1) {
1681                                 file_share = &_wapi_fileshare_layout->share_info[++i];
1682                                 _wapi_fileshare_layout->hwm = i;
1683                         } else {
1684                                 file_share = &_wapi_fileshare_layout->share_info[first_unused];
1685                         }
1686
1687                         file_share->device = device;
1688                         file_share->inode = inode;
1689                         file_share->opened_by_pid = _wapi_getpid ();
1690                         file_share->sharemode = new_sharemode;
1691                         file_share->access = new_access;
1692                         file_share->handle_refs = 1;
1693                         *share_info = file_share;
1694                 }
1695         }
1696
1697         if (*share_info != NULL) {
1698                 InterlockedExchange ((gint32 *)&(*share_info)->timestamp, now);
1699         }
1700
1701         thr_ret = _wapi_shm_sem_unlock (_WAPI_SHARED_SEM_FILESHARE);
1702
1703         _wapi_handle_unlock_shared_handles ();
1704
1705         return(exists);
1706 }
1707
1708 /* If we don't have the info in /proc, check if the process that
1709  * opened this share info is still there (it's not a perfect method,
1710  * due to pid reuse)
1711  */
1712 static void _wapi_handle_check_share_by_pid (struct _WapiFileShare *share_info)
1713 {
1714         if (kill (share_info->opened_by_pid, 0) == -1 &&
1715             (errno == ESRCH ||
1716              errno == EPERM)) {
1717                 /* It's gone completely (or there's a new process
1718                  * owned by someone else) so mark this share info as
1719                  * dead
1720                  */
1721 #ifdef DEBUG
1722                 g_message ("%s: Didn't find it, destroying entry", __func__);
1723 #endif
1724
1725                 memset (share_info, '\0', sizeof(struct _WapiFileShare));
1726         }
1727 }
1728
1729 #ifdef __linux__
1730 /* Scan /proc/<pids>/fd/ for open file descriptors to the file in
1731  * question.  If there are none, reset the share info.
1732  *
1733  * This implementation is Linux-specific; legacy systems will have to
1734  * implement their own ways of finding out if a particular file is
1735  * open by a process.
1736  */
1737 void _wapi_handle_check_share (struct _WapiFileShare *share_info, int fd)
1738 {
1739         gboolean found = FALSE, proc_fds = FALSE;
1740         pid_t self = _wapi_getpid ();
1741         int pid;
1742         int thr_ret, i;
1743
1744         /* Prevents entries from expiring under us if we remove this
1745          * one
1746          */
1747         thr_ret = _wapi_handle_lock_shared_handles ();
1748         g_assert (thr_ret == 0);
1749
1750         /* Prevent new entries racing with us */
1751         thr_ret = _wapi_shm_sem_lock (_WAPI_SHARED_SEM_FILESHARE);
1752         g_assert (thr_ret == 0);
1753
1754         /* If there is no /proc, there's nothing more we can do here */
1755         if (access ("/proc", F_OK) == -1) {
1756                 _wapi_handle_check_share_by_pid (share_info);
1757                 goto done;
1758         }
1759
1760         /* If there's another handle that thinks it owns this fd, then even
1761          * if the fd has been closed behind our back consider it still owned.
1762          * See bugs 75764 and 75891
1763          */
1764         for (i = 0; i < _wapi_fd_reserve; i++) {
1765                 if (_wapi_private_handles [SLOT_INDEX (i)]) {
1766                         struct _WapiHandleUnshared *handle = &_WAPI_PRIVATE_HANDLES(i);
1767
1768                         if (i != fd &&
1769                                 handle->type == WAPI_HANDLE_FILE) {
1770                                 struct _WapiHandle_file *file_handle = &handle->u.file;
1771
1772                                 if (file_handle->share_info == share_info) {
1773 #ifdef DEBUG
1774                                         g_message ("%s: handle 0x%x has this file open!",
1775                                                            __func__, i);
1776 #endif
1777
1778                                         goto done;
1779                                 }
1780                         }
1781                 }
1782         }
1783
1784         for (i = 0; i < _WAPI_HANDLE_INITIAL_COUNT; i++) {
1785                 struct _WapiHandleShared *shared;
1786                 struct _WapiHandle_process *process_handle;
1787
1788                 shared = &_wapi_shared_layout->handles[i];
1789
1790                 if (shared->type == WAPI_HANDLE_PROCESS) {
1791                         DIR *fd_dir;
1792                         struct dirent *fd_entry;
1793                         char subdir[_POSIX_PATH_MAX];
1794
1795                         process_handle = &shared->u.process;
1796                         pid = process_handle->id;
1797
1798                         /* Look in /proc/<pid>/fd/ but ignore
1799                          * /proc/<our pid>/fd/<fd>, as we have the
1800                          * file open too
1801                          */
1802                         g_snprintf (subdir, _POSIX_PATH_MAX, "/proc/%d/fd",
1803                                     pid);
1804
1805                         fd_dir = opendir (subdir);
1806                         if (fd_dir == NULL) {
1807                                 continue;
1808                         }
1809
1810 #ifdef DEBUG
1811                         g_message ("%s: Looking in %s", __func__, subdir);
1812 #endif
1813
1814                         proc_fds = TRUE;
1815
1816                         while ((fd_entry = readdir (fd_dir)) != NULL) {
1817                                 char path[_POSIX_PATH_MAX];
1818                                 struct stat link_stat;
1819
1820                                 if (!strcmp (fd_entry->d_name, ".") ||
1821                                     !strcmp (fd_entry->d_name, "..") ||
1822                                     (pid == self &&
1823                                      fd == atoi (fd_entry->d_name))) {
1824                                         continue;
1825                                 }
1826
1827                                 g_snprintf (path, _POSIX_PATH_MAX,
1828                                             "/proc/%d/fd/%s", pid,
1829                                             fd_entry->d_name);
1830
1831                                 stat (path, &link_stat);
1832                                 if (link_stat.st_dev == share_info->device &&
1833                                     link_stat.st_ino == share_info->inode) {
1834 #ifdef DEBUG
1835                                         g_message ("%s:  Found it at %s",
1836                                                    __func__, path);
1837 #endif
1838
1839                                         found = TRUE;
1840                                 }
1841                         }
1842
1843                         closedir (fd_dir);
1844                 }
1845         }
1846
1847         if (proc_fds == FALSE) {
1848                 _wapi_handle_check_share_by_pid (share_info);
1849         } else if (found == FALSE) {
1850                 /* Blank out this entry, as it is stale */
1851 #ifdef DEBUG
1852                 g_message ("%s: Didn't find it, destroying entry", __func__);
1853 #endif
1854
1855                 memset (share_info, '\0', sizeof(struct _WapiFileShare));
1856         }
1857
1858 done:
1859         thr_ret = _wapi_shm_sem_unlock (_WAPI_SHARED_SEM_FILESHARE);
1860
1861         _wapi_handle_unlock_shared_handles ();
1862 }
1863 #else
1864 //
1865 // Other implementations (non-Linux)
1866 //
1867 void _wapi_handle_check_share (struct _WapiFileShare *share_info, int fd)
1868 {
1869         int thr_ret;
1870
1871         /* Prevents entries from expiring under us if we remove this
1872          * one */
1873         thr_ret = _wapi_handle_lock_shared_handles ();
1874         g_assert (thr_ret == 0);
1875
1876         /* Prevent new entries racing with us */
1877         thr_ret = _wapi_shm_sem_lock (_WAPI_SHARED_SEM_FILESHARE);
1878         g_assert (thr_ret == 0);
1879
1880         _wapi_handle_check_share_by_pid (share_info);
1881
1882         thr_ret = _wapi_shm_sem_unlock (_WAPI_SHARED_SEM_FILESHARE);
1883         _wapi_handle_unlock_shared_handles ();
1884 }
1885 #endif
1886
1887 void _wapi_handle_dump (void)
1888 {
1889         struct _WapiHandleUnshared *handle_data;
1890         guint32 i, k;
1891         int thr_ret;
1892
1893         pthread_cleanup_push ((void(*)(void *))mono_mutex_unlock_in_cleanup,
1894                               (void *)&scan_mutex);
1895         thr_ret = mono_mutex_lock (&scan_mutex);
1896         g_assert (thr_ret == 0);
1897
1898         for(i = SLOT_INDEX (0); i < _wapi_private_handle_slot_count; i++) {
1899                 if (_wapi_private_handles [i]) {
1900                         for (k = SLOT_OFFSET (0); k < _WAPI_HANDLE_INITIAL_COUNT; k++) {
1901                                 handle_data = &_wapi_private_handles [i][k];
1902
1903                                 if (handle_data->type == WAPI_HANDLE_UNUSED) {
1904                                         continue;
1905                                 }
1906
1907                                 g_print ("%3x [%7s] %s %d ",
1908                                                  i * _WAPI_HANDLE_INITIAL_COUNT + k,
1909                                                  _wapi_handle_typename[handle_data->type],
1910                                                  handle_data->signalled?"Sg":"Un",
1911                                                  handle_data->ref);
1912                                 handle_details[handle_data->type](&handle_data->u);
1913                                 g_print ("\n");
1914                         }
1915                 }
1916         }
1917
1918         thr_ret = mono_mutex_unlock (&scan_mutex);
1919         g_assert (thr_ret == 0);
1920         pthread_cleanup_pop (0);
1921 }
1922
1923 static void _wapi_shared_details (gpointer handle_info)
1924 {
1925         struct _WapiHandle_shared_ref *shared = (struct _WapiHandle_shared_ref *)handle_info;
1926
1927         g_print ("offset: 0x%x", shared->offset);
1928 }
1929
1930 void _wapi_handle_update_refs (void)
1931 {
1932         guint32 i, k;
1933         int thr_ret;
1934         guint32 now = (guint32)(time (NULL) & 0xFFFFFFFF);
1935
1936         thr_ret = _wapi_handle_lock_shared_handles ();
1937         g_assert (thr_ret == 0);
1938
1939         /* Prevent file share entries racing with us */
1940         thr_ret = _wapi_shm_sem_lock (_WAPI_SHARED_SEM_FILESHARE);
1941         g_assert(thr_ret == 0);
1942
1943         pthread_cleanup_push ((void(*)(void *))mono_mutex_unlock_in_cleanup,
1944                               (void *)&scan_mutex);
1945         thr_ret = mono_mutex_lock (&scan_mutex);
1946
1947         for(i = SLOT_INDEX (0); i < _wapi_private_handle_slot_count; i++) {
1948                 if (_wapi_private_handles [i]) {
1949                         for (k = SLOT_OFFSET (0); k < _WAPI_HANDLE_INITIAL_COUNT; k++) {
1950                                 struct _WapiHandleUnshared *handle = &_wapi_private_handles [i][k];
1951
1952                                 if (_WAPI_SHARED_HANDLE(handle->type)) {
1953                                         struct _WapiHandleShared *shared_data;
1954
1955 #ifdef DEBUG
1956                                         g_message ("%s: (%d) handle 0x%x is SHARED (%s)", __func__, _wapi_getpid (), i * _WAPI_HANDLE_INITIAL_COUNT + k, _wapi_handle_typename[handle->type]);
1957 #endif
1958
1959                                         shared_data = &_wapi_shared_layout->handles[handle->u.shared.offset];
1960
1961 #ifdef DEBUG
1962                                         g_message ("%s: (%d) Updating timestamp of handle 0x%x", __func__, _wapi_getpid (), handle->u.shared.offset);
1963 #endif
1964
1965                                         InterlockedExchange ((gint32 *)&shared_data->timestamp, now);
1966                                 } else if (handle->type == WAPI_HANDLE_FILE) {
1967                                         struct _WapiHandle_file *file_handle = &handle->u.file;
1968
1969 #ifdef DEBUG
1970                                         g_message ("%s: (%d) handle 0x%x is FILE", __func__, _wapi_getpid (), i * _WAPI_HANDLE_INITIAL_COUNT + k);
1971 #endif
1972
1973                                         g_assert (file_handle->share_info != NULL);
1974
1975 #ifdef DEBUG
1976                                         g_message ("%s: (%d) Inc refs on fileshare 0x%x", __func__, _wapi_getpid (), (file_handle->share_info - &_wapi_fileshare_layout->share_info[0]) / sizeof(struct _WapiFileShare));
1977 #endif
1978
1979                                         InterlockedExchange ((gint32 *)&file_handle->share_info->timestamp, now);
1980                                 }
1981                         }
1982                 }
1983         }
1984
1985         thr_ret = mono_mutex_unlock (&scan_mutex);
1986         g_assert (thr_ret == 0);
1987         pthread_cleanup_pop (0);
1988
1989         thr_ret = _wapi_shm_sem_unlock (_WAPI_SHARED_SEM_FILESHARE);
1990
1991         _wapi_handle_unlock_shared_handles ();
1992 }
1993