src/threads/native/threads.c

   1 /* src/threads/native/threads.c - native threads support
   2
   3    Copyright (C) 1996-2005, 2006, 2007 R. Grafl, A. Krall, C. Kruegel,
   4    C. Oates, R. Obermaisser, M. Platter, M. Probst, S. Ring,
   5    E. Steiner, C. Thalinger, D. Thuernbeck, P. Tomsich, C. Ullrich,
   6    J. Wenninger, Institut f. Computersprachen - TU Wien
   7
   8    This file is part of CACAO.
   9
  10    This program is free software; you can redistribute it and/or
  11    modify it under the terms of the GNU General Public License as
  12    published by the Free Software Foundation; either version 2, or (at
  13    your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful, but
  16    WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18    General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program; if not, write to the Free Software
  22    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  23    02110-1301, USA.
  24
  25    $Id: threads.c 7338 2007-02-13 00:17:22Z twisti $
  26
  27 */
  28
  29
  30 #include "config.h"
  31
  32 /* XXX cleanup these includes */
  33
  34 #include <stdlib.h>
  35 #include <string.h>
  36 #include <assert.h>
  37 #include <sys/types.h>
  38 #include <unistd.h>
  39 #include <signal.h>
  40 #include <sys/time.h>
  41 #include <time.h>
  42 #include <errno.h>
  43
  44 #include <pthread.h>
  45
  46 #include "vm/types.h"
  47
  48 #include "arch.h"
  49
  50 #if !defined(USE_FAKE_ATOMIC_INSTRUCTIONS)
  51 # include "machine-instr.h"
  52 #else
  53 # include "threads/native/generic-primitives.h"
  54 #endif
  55
  56 #include "mm/gc-common.h"
  57 #include "mm/memory.h"
  58
  59 #include "native/jni.h"
  60 #include "native/native.h"
  61 #include "native/include/java_lang_Object.h"
  62 #include "native/include/java_lang_String.h"
  63 #include "native/include/java_lang_Throwable.h"
  64 #include "native/include/java_lang_Thread.h"
  65
  66 #if defined(ENABLE_JAVASE)
  67 # include "native/include/java_lang_ThreadGroup.h"
  68 #endif
  69
  70 #if defined(WITH_CLASSPATH_GNU)
  71 # include "native/include/java_lang_VMThread.h"
  72 #endif
  73
  74 #include "threads/threads-common.h"
  75
  76 #include "threads/native/threads.h"
  77
  78 #include "toolbox/avl.h"
  79 #include "toolbox/logging.h"
  80
  81 #include "vm/builtin.h"
  82 #include "vm/exceptions.h"
  83 #include "vm/global.h"
  84 #include "vm/stringlocal.h"
  85 #include "vm/vm.h"
  86
  87 #include "vm/jit/asmpart.h"
  88
  89 #include "vmcore/options.h"
  90
  91 #if !defined(__DARWIN__)
  92 # if defined(__LINUX__)
  93 #  define GC_LINUX_THREADS
  94 # elif defined(__MIPS__)
  95 #  define GC_IRIX_THREADS
  96 # endif
  97 # include <semaphore.h>
  98 # if defined(ENABLE_GC_BOEHM)
  99 #  include "mm/boehm-gc/include/gc.h"
 100 # endif
 101 #endif
 102
 103 #if defined(ENABLE_JVMTI)
 104 #include "native/jvmti/cacaodbg.h"
 105 #endif
 106
 107 #if defined(__DARWIN__)
 108 /* Darwin has no working semaphore implementation.  This one is taken
 109    from Boehm-GC. */
 110
 111 /*
 112    This is a very simple semaphore implementation for darwin. It
 113    is implemented in terms of pthreads calls so it isn't async signal
 114    safe. This isn't a problem because signals aren't used to
 115    suspend threads on darwin.
 116 */
 117
 118 static int sem_init(sem_t *sem, int pshared, int value)
 119 {
 120         if (pshared)
 121                 assert(0);
 122
 123         sem->value = value;
 124
 125         if (pthread_mutex_init(&sem->mutex, NULL) < 0)
 126                 return -1;
 127
 128         if (pthread_cond_init(&sem->cond, NULL) < 0)
 129                 return -1;
 130
 131         return 0;
 132 }
 133
 134 static int sem_post(sem_t *sem)
 135 {
 136         if (pthread_mutex_lock(&sem->mutex) < 0)
 137                 return -1;
 138
 139         sem->value++;
 140
 141         if (pthread_cond_signal(&sem->cond) < 0) {
 142                 pthread_mutex_unlock(&sem->mutex);
 143                 return -1;
 144         }
 145
 146         if (pthread_mutex_unlock(&sem->mutex) < 0)
 147                 return -1;
 148
 149         return 0;
 150 }
 151
 152 static int sem_wait(sem_t *sem)
 153 {
 154         if (pthread_mutex_lock(&sem->mutex) < 0)
 155                 return -1;
 156
 157         while (sem->value == 0) {
 158                 pthread_cond_wait(&sem->cond, &sem->mutex);
 159         }
 160
 161         sem->value--;
 162
 163         if (pthread_mutex_unlock(&sem->mutex) < 0)
 164                 return -1;
 165
 166         return 0;
 167 }
 168
 169 static int sem_destroy(sem_t *sem)
 170 {
 171         if (pthread_cond_destroy(&sem->cond) < 0)
 172                 return -1;
 173
 174         if (pthread_mutex_destroy(&sem->mutex) < 0)
 175                 return -1;
 176
 177         return 0;
 178 }
 179 #endif /* defined(__DARWIN__) */
 180
 181
 182 /* internally used constants **************************************************/
 183
 184 /* CAUTION: Do not change these values. Boehm GC code depends on them.        */
 185 #define STOPWORLD_FROM_GC               1
 186 #define STOPWORLD_FROM_CLASS_NUMBERING  2
 187
 188 #define THREADS_INITIAL_TABLE_SIZE      8
 189
 190
 191 /* startupinfo *****************************************************************
 192
 193    Struct used to pass info from threads_start_thread to
 194    threads_startup_thread.
 195
 196 ******************************************************************************/
 197
 198 typedef struct {
 199         threadobject *thread;      /* threadobject for this thread             */
 200         functionptr   function;    /* function to run in the new thread        */
 201         sem_t        *psem;        /* signals when thread has been entered     */
 202                                    /* in the thread list                       */
 203         sem_t        *psem_first;  /* signals when pthread_create has returned */
 204 } startupinfo;
 205
 206
 207 /* prototypes *****************************************************************/
 208
 209 static void threads_table_init(void);
 210 static s4 threads_table_add(threadobject *thread);
 211 static void threads_table_remove(threadobject *thread);
 212 static void threads_calc_absolute_time(struct timespec *tm, s8 millis, s4 nanos);
 213
 214 #if !defined(NDEBUG) && 0
 215 static void threads_table_dump(FILE *file);
 216 #endif
 217
 218 /******************************************************************************/
 219 /* GLOBAL VARIABLES                                                           */
 220 /******************************************************************************/
 221
 222 /* the main thread                                                            */
 223 threadobject *mainthreadobj;
 224
 225 static methodinfo *method_thread_init;
 226
 227 /* the thread object of the current thread                                    */
 228 /* This is either a thread-local variable defined with __thread, or           */
 229 /* a thread-specific value stored with key threads_current_threadobject_key.  */
 230 #if defined(HAVE___THREAD)
 231 __thread threadobject *threads_current_threadobject;
 232 #else
 233 pthread_key_t threads_current_threadobject_key;
 234 #endif
 235
 236 /* global threads table                                                       */
 237 static threads_table_t threads_table;
 238
 239 /* global compiler mutex                                                      */
 240 static pthread_mutex_t compiler_mutex;
 241
 242 /* global mutex for changing the thread list                                  */
 243 static pthread_mutex_t threadlistlock;
 244
 245 /* global mutex for stop-the-world                                            */
 246 static pthread_mutex_t stopworldlock;
 247
 248 /* this is one of the STOPWORLD_FROM_ constants, telling why the world is     */
 249 /* being stopped                                                              */
 250 static volatile int stopworldwhere;
 251
 252 /* semaphore used for acknowleding thread suspension                          */
 253 static sem_t suspend_ack;
 254 #if defined(__MIPS__)
 255 static pthread_mutex_t suspend_ack_lock = PTHREAD_MUTEX_INITIALIZER;
 256 static pthread_cond_t suspend_cond = PTHREAD_COND_INITIALIZER;
 257 #endif
 258
 259 static pthread_attr_t threadattr;
 260
 261 /* mutexes used by the fake atomic instructions                               */
 262 #if defined(USE_FAKE_ATOMIC_INSTRUCTIONS)
 263 pthread_mutex_t _atomic_add_lock = PTHREAD_MUTEX_INITIALIZER;
 264 pthread_mutex_t _cas_lock = PTHREAD_MUTEX_INITIALIZER;
 265 pthread_mutex_t _mb_lock = PTHREAD_MUTEX_INITIALIZER;
 266 #endif
 267
 268
 269 /* threads_sem_init ************************************************************
 270
 271    Initialize a semaphore. Checks against errors and interruptions.
 272
 273    IN:
 274        sem..............the semaphore to initialize
 275            shared...........true if this semaphore will be shared between processes
 276            value............the initial value for the semaphore
 277
 278 *******************************************************************************/
 279
 280 void threads_sem_init(sem_t *sem, bool shared, int value)
 281 {
 282         int r;
 283
 284         assert(sem);
 285
 286         do {
 287                 r = sem_init(sem, shared, value);
 288                 if (r == 0)
 289                         return;
 290         } while (errno == EINTR);
 291
 292         vm_abort("sem_init failed: %s", strerror(errno));
 293 }
 294
 295
 296 /* threads_sem_wait ************************************************************
 297
 298    Wait for a semaphore, non-interruptible.
 299
 300    IMPORTANT: Always use this function instead of `sem_wait` directly, as
 301               `sem_wait` may be interrupted by signals!
 302
 303    IN:
 304        sem..............the semaphore to wait on
 305
 306 *******************************************************************************/
 307
 308 void threads_sem_wait(sem_t *sem)
 309 {
 310         int r;
 311
 312         assert(sem);
 313
 314         do {
 315                 r = sem_wait(sem);
 316                 if (r == 0)
 317                         return;
 318         } while (errno == EINTR);
 319
 320         vm_abort("sem_wait failed: %s", strerror(errno));
 321 }
 322
 323
 324 /* threads_sem_post ************************************************************
 325
 326    Increase the count of a semaphore. Checks for errors.
 327
 328    IN:
 329        sem..............the semaphore to increase the count of
 330
 331 *******************************************************************************/
 332
 333 void threads_sem_post(sem_t *sem)
 334 {
 335         int r;
 336
 337         assert(sem);
 338
 339         /* unlike sem_wait, sem_post is not interruptible */
 340
 341         r = sem_post(sem);
 342         if (r == 0)
 343                 return;
 344
 345         vm_abort("sem_post failed: %s", strerror(errno));
 346 }
 347
 348
 349 /* compiler_lock ***************************************************************
 350
 351    Enter the compiler lock.
 352
 353 ******************************************************************************/
 354
 355 void compiler_lock(void)
 356 {
 357         pthread_mutex_lock(&compiler_mutex);
 358 }
 359
 360
 361 /* compiler_unlock *************************************************************
 362
 363    Release the compiler lock.
 364
 365 ******************************************************************************/
 366
 367 void compiler_unlock(void)
 368 {
 369         pthread_mutex_unlock(&compiler_mutex);
 370 }
 371
 372
 373 /* lock_stopworld **************************************************************
 374
 375    Enter the stopworld lock, specifying why the world shall be stopped.
 376
 377    IN:
 378       where........ STOPWORLD_FROM_GC              (1) from within GC
 379                     STOPWORLD_FROM_CLASS_NUMBERING (2) class numbering
 380
 381 ******************************************************************************/
 382
 383 void lock_stopworld(int where)
 384 {
 385         pthread_mutex_lock(&stopworldlock);
 386         stopworldwhere = where;
 387 }
 388
 389
 390 /* unlock_stopworld ************************************************************
 391
 392    Release the stopworld lock.
 393
 394 ******************************************************************************/
 395
 396 void unlock_stopworld(void)
 397 {
 398         stopworldwhere = 0;
 399         pthread_mutex_unlock(&stopworldlock);
 400 }
 401
 402 #if !defined(__DARWIN__)
 403 /* Caller must hold threadlistlock */
 404 static int threads_cast_sendsignals(int sig, int count)
 405 {
 406         /* Count threads */
 407         threadobject *tobj = mainthreadobj;
 408         threadobject *self = THREADOBJECT;
 409
 410         if (count == 0) {
 411                 do {
 412                         count++;
 413                         tobj = tobj->next;
 414                 } while (tobj != mainthreadobj);
 415         }
 416
 417         assert(tobj == mainthreadobj);
 418
 419         do {
 420                 if (tobj != self)
 421                         pthread_kill(tobj->tid, sig);
 422                 tobj = tobj->next;
 423         } while (tobj != mainthreadobj);
 424
 425         return count - 1;
 426 }
 427
 428 #else
 429
 430 static void threads_cast_darwinstop(void)
 431 {
 432         threadobject *tobj = mainthreadobj;
 433         threadobject *self = THREADOBJECT;
 434
 435         do {
 436                 if (tobj != self)
 437                 {
 438                         thread_state_flavor_t flavor = MACHINE_THREAD_STATE;
 439                         mach_msg_type_number_t thread_state_count = MACHINE_THREAD_STATE_COUNT;
 440 #if defined(__I386__)
 441                         i386_thread_state_t thread_state;
 442 #else
 443                         ppc_thread_state_t thread_state;
 444 #endif
 445                         mach_port_t thread = tobj->mach_thread;
 446                         kern_return_t r;
 447
 448                         r = thread_suspend(thread);
 449
 450                         if (r != KERN_SUCCESS)
 451                                 vm_abort("thread_suspend failed");
 452
 453                         r = thread_get_state(thread, flavor, (natural_t *) &thread_state,
 454                                                                  &thread_state_count);
 455
 456                         if (r != KERN_SUCCESS)
 457                                 vm_abort("thread_get_state failed");
 458
 459                         thread_restartcriticalsection((ucontext_t *) &thread_state);
 460
 461                         r = thread_set_state(thread, flavor, (natural_t *) &thread_state,
 462                                                                  thread_state_count);
 463
 464                         if (r != KERN_SUCCESS)
 465                                 vm_abort("thread_set_state failed");
 466                 }
 467
 468                 tobj = tobj->next;
 469         } while (tobj != mainthreadobj);
 470 }
 471
 472 static void threads_cast_darwinresume(void)
 473 {
 474         threadobject *tobj = mainthreadobj;
 475         threadobject *self = THREADOBJECT;
 476
 477         do {
 478                 if (tobj != self)
 479                 {
 480                         mach_port_t thread = tobj->mach_thread;
 481                         kern_return_t r;
 482
 483                         r = thread_resume(thread);
 484
 485                         if (r != KERN_SUCCESS)
 486                                 vm_abort("thread_resume failed");
 487                 }
 488
 489                 tobj = tobj->next;
 490         } while (tobj != mainthreadobj);
 491 }
 492
 493 #endif
 494
 495 #if defined(__MIPS__)
 496 static void threads_cast_irixresume(void)
 497 {
 498         pthread_mutex_lock(&suspend_ack_lock);
 499         pthread_cond_broadcast(&suspend_cond);
 500         pthread_mutex_unlock(&suspend_ack_lock);
 501 }
 502 #endif
 503
 504 #if !defined(DISABLE_GC)
 505
 506 void threads_cast_stopworld(void)
 507 {
 508 #if !defined(__DARWIN__) && !defined(__CYGWIN__)
 509         int count, i;
 510 #endif
 511
 512         lock_stopworld(STOPWORLD_FROM_CLASS_NUMBERING);
 513         pthread_mutex_lock(&threadlistlock);
 514
 515 #if defined(__DARWIN__)
 516         threads_cast_darwinstop();
 517 #elif defined(__CYGWIN__)
 518         /* TODO */
 519         assert(0);
 520 #else
 521         count = threads_cast_sendsignals(GC_signum1(), 0);
 522         for (i = 0; i < count; i++)
 523                 threads_sem_wait(&suspend_ack);
 524 #endif
 525
 526         pthread_mutex_unlock(&threadlistlock);
 527 }
 528
 529 void threads_cast_startworld(void)
 530 {
 531         pthread_mutex_lock(&threadlistlock);
 532 #if defined(__DARWIN__)
 533         threads_cast_darwinresume();
 534 #elif defined(__MIPS__)
 535         threads_cast_irixresume();
 536 #elif defined(__CYGWIN__)
 537         /* TODO */
 538         assert(0);
 539 #else
 540         threads_cast_sendsignals(GC_signum2(), -1);
 541 #endif
 542         pthread_mutex_unlock(&threadlistlock);
 543         unlock_stopworld();
 544 }
 545
 546
 547 #if !defined(__DARWIN__)
 548 static void threads_sigsuspend_handler(ucontext_t *ctx)
 549 {
 550         int sig;
 551         sigset_t sigs;
 552
 553         /* XXX TWISTI: this is just a quick hack */
 554 #if defined(ENABLE_JIT)
 555         thread_restartcriticalsection(ctx);
 556 #endif
 557
 558         /* Do as Boehm does. On IRIX a condition variable is used for wake-up
 559            (not POSIX async-safe). */
 560 #if defined(__IRIX__)
 561         pthread_mutex_lock(&suspend_ack_lock);
 562         threads_sem_post(&suspend_ack);
 563         pthread_cond_wait(&suspend_cond, &suspend_ack_lock);
 564         pthread_mutex_unlock(&suspend_ack_lock);
 565 #elif defined(__CYGWIN__)
 566         /* TODO */
 567         assert(0);
 568 #else
 569         threads_sem_post(&suspend_ack);
 570
 571         sig = GC_signum2();
 572         sigfillset(&sigs);
 573         sigdelset(&sigs, sig);
 574         sigsuspend(&sigs);
 575 #endif
 576 }
 577
 578 /* This function is called from Boehm GC code. */
 579
 580 int cacao_suspendhandler(ucontext_t *ctx)
 581 {
 582         if (stopworldwhere != STOPWORLD_FROM_CLASS_NUMBERING)
 583                 return 0;
 584
 585         threads_sigsuspend_handler(ctx);
 586         return 1;
 587 }
 588 #endif
 589
 590 #endif /* DISABLE_GC */
 591
 592 /* threads_set_current_threadobject ********************************************
 593
 594    Set the current thread object.
 595
 596    IN:
 597       thread.......the thread object to set
 598
 599 *******************************************************************************/
 600
 601 static void threads_set_current_threadobject(threadobject *thread)
 602 {
 603 #if !defined(HAVE___THREAD)
 604         pthread_setspecific(threads_current_threadobject_key, thread);
 605 #else
 606         threads_current_threadobject = thread;
 607 #endif
 608 }
 609
 610
 611 /* threads_init_threadobject **************************************************
 612
 613    Initialize implementation fields of a threadobject.
 614
 615    IN:
 616       thread............the threadobject
 617
 618 ******************************************************************************/
 619
 620 static void threads_init_threadobject(threadobject *thread)
 621 {
 622         thread->tid = pthread_self();
 623
 624         thread->index = 0;
 625
 626         /* TODO destroy all those things */
 627         pthread_mutex_init(&(thread->joinmutex), NULL);
 628         pthread_cond_init(&(thread->joincond), NULL);
 629
 630         pthread_mutex_init(&(thread->waitmutex), NULL);
 631         pthread_cond_init(&(thread->waitcond), NULL);
 632
 633         thread->interrupted = false;
 634         thread->signaled = false;
 635         thread->sleeping = false;
 636 }
 637
 638
 639 /* threads_get_current_threadobject ********************************************
 640
 641    Return the threadobject of the current thread.
 642
 643    RETURN VALUE:
 644        the current threadobject * (an instance of java.lang.Thread)
 645
 646 *******************************************************************************/
 647
 648 threadobject *threads_get_current_threadobject(void)
 649 {
 650         return THREADOBJECT;
 651 }
 652
 653
 654 /* threads_preinit *************************************************************
 655
 656    Do some early initialization of stuff required.
 657
 658    ATTENTION: Do NOT use any Java heap allocation here, as gc_init()
 659    is called AFTER this function!
 660
 661 *******************************************************************************/
 662
 663 void threads_preinit(void)
 664 {
 665         pthread_mutexattr_t mutexattr;
 666         pthread_mutexattr_init(&mutexattr);
 667         pthread_mutexattr_settype(&mutexattr, PTHREAD_MUTEX_RECURSIVE);
 668         pthread_mutex_init(&compiler_mutex, &mutexattr);
 669         pthread_mutexattr_destroy(&mutexattr);
 670
 671         pthread_mutex_init(&threadlistlock, NULL);
 672         pthread_mutex_init(&stopworldlock, NULL);
 673
 674         mainthreadobj = NEW(threadobject);
 675         mainthreadobj->tid      = pthread_self();
 676         mainthreadobj->index    = 1;
 677         mainthreadobj->thinlock = lock_pre_compute_thinlock(mainthreadobj->index);
 678
 679 #if !defined(HAVE___THREAD)
 680         pthread_key_create(&threads_current_threadobject_key, NULL);
 681 #endif
 682         threads_set_current_threadobject(mainthreadobj);
 683
 684         threads_sem_init(&suspend_ack, 0, 0);
 685
 686         /* initialize the threads table */
 687
 688         threads_table_init();
 689
 690         /* initialize subsystems */
 691
 692         lock_init();
 693
 694         critical_init();
 695 }
 696
 697
 698 /* threads_init ****************************************************************
 699
 700    Initializes the threads required by the JVM: main, finalizer.
 701
 702 *******************************************************************************/
 703
 704 bool threads_init(void)
 705 {
 706         java_lang_String      *threadname;
 707         threadobject          *tempthread;
 708         java_objectheader     *o;
 709
 710 #if defined(ENABLE_JAVASE)
 711         java_lang_ThreadGroup *threadgroup;
 712         methodinfo            *m;
 713         java_lang_Thread      *t;
 714 #endif
 715
 716 #if defined(WITH_CLASSPATH_GNU)
 717         java_lang_VMThread    *vmt;
 718 #endif
 719
 720         tempthread = mainthreadobj;
 721
 722         /* XXX We have to find a new way to free lock records */
 723         /*     with the new locking algorithm.                */
 724         /* lock_record_free_pools(mainthreadobj->ee.lockrecordpools); */
 725
 726         /* This is kinda tricky, we grow the java.lang.Thread object so we
 727            can keep the execution environment there. No Thread object must
 728            have been created at an earlier time. */
 729
 730         class_java_lang_Thread->instancesize = sizeof(threadobject);
 731
 732         /* get methods we need in this file */
 733
 734 #if defined(WITH_CLASSPATH_GNU)
 735         method_thread_init =
 736                 class_resolveclassmethod(class_java_lang_Thread,
 737                                                                  utf_init,
 738                                                                  utf_new_char("(Ljava/lang/VMThread;Ljava/lang/String;IZ)V"),
 739                                                                  class_java_lang_Thread,
 740                                                                  true);
 741 #else
 742         method_thread_init =
 743                 class_resolveclassmethod(class_java_lang_Thread,
 744                                                                  utf_init,
 745                                                                  utf_new_char("(Ljava/lang/String;)V"),
 746                                                                  class_java_lang_Thread,
 747                                                                  true);
 748 #endif
 749
 750         if (method_thread_init == NULL)
 751                 return false;
 752
 753         /* create a java.lang.Thread for the main thread */
 754
 755         mainthreadobj = (threadobject *) builtin_new(class_java_lang_Thread);
 756
 757         if (mainthreadobj == NULL)
 758                 return false;
 759
 760         FREE(tempthread, threadobject);
 761
 762         threads_init_threadobject(mainthreadobj);
 763
 764         threads_set_current_threadobject(mainthreadobj);
 765
 766         lock_init_execution_env(mainthreadobj);
 767
 768         mainthreadobj->next = mainthreadobj;
 769         mainthreadobj->prev = mainthreadobj;
 770
 771         threads_table_add(mainthreadobj);
 772
 773         /* mark main thread as Java thread */
 774
 775         mainthreadobj->flags = THREAD_FLAG_JAVA;
 776
 777 #if defined(ENABLE_INTRP)
 778         /* create interpreter stack */
 779
 780         if (opt_intrp) {
 781                 MSET(intrp_main_stack, 0, u1, opt_stacksize);
 782                 mainthreadobj->_global_sp = (Cell*) (intrp_main_stack + opt_stacksize);
 783         }
 784 #endif
 785
 786         threadname = javastring_new(utf_new_char("main"));
 787
 788 #if defined(ENABLE_JAVASE)
 789         /* allocate and init ThreadGroup */
 790
 791         threadgroup = (java_lang_ThreadGroup *)
 792                 native_new_and_init(class_java_lang_ThreadGroup);
 793
 794         if (threadgroup == NULL)
 795                 throw_exception_exit();
 796 #endif
 797
 798 #if defined(WITH_CLASSPATH_GNU)
 799         /* create a java.lang.VMThread for the main thread */
 800
 801         vmt = (java_lang_VMThread *) builtin_new(class_java_lang_VMThread);
 802
 803         if (vmt == NULL)
 804                 throw_exception_exit();
 805
 806         /* set the thread */
 807
 808         t           = (java_lang_Thread *) mainthreadobj;
 809         vmt->thread = t;
 810
 811         /* call java.lang.Thread.<init>(Ljava/lang/VMThread;Ljava/lang/String;IZ)V */
 812         o = (java_objectheader *) mainthreadobj;
 813
 814         (void) vm_call_method(method_thread_init, o, vmt, threadname, NORM_PRIORITY,
 815                                                   false);
 816 #elif defined(WITH_CLASSPATH_CLDC1_1)
 817         /* call public Thread(String name) */
 818
 819         o = (java_objectheader *) mainthreadobj;
 820
 821         (void) vm_call_method(method_thread_init, o, threadname);
 822 #endif
 823
 824         if (*exceptionptr)
 825                 return false;
 826
 827 #if defined(ENABLE_JAVASE)
 828         mainthreadobj->o.group = threadgroup;
 829
 830         /* add main thread to java.lang.ThreadGroup */
 831
 832         m = class_resolveclassmethod(class_java_lang_ThreadGroup,
 833                                                                  utf_addThread,
 834                                                                  utf_java_lang_Thread__V,
 835                                                                  class_java_lang_ThreadGroup,
 836                                                                  true);
 837
 838         o = (java_objectheader *) threadgroup;
 839         t = (java_lang_Thread *) mainthreadobj;
 840
 841         (void) vm_call_method(m, o, t);
 842
 843         if (*exceptionptr)
 844                 return false;
 845
 846 #endif
 847
 848         threads_set_thread_priority(pthread_self(), NORM_PRIORITY);
 849
 850         /* initialize the thread attribute object */
 851
 852         if (pthread_attr_init(&threadattr)) {
 853                 log_println("pthread_attr_init failed: %s", strerror(errno));
 854                 return false;
 855         }
 856
 857         pthread_attr_setdetachstate(&threadattr, PTHREAD_CREATE_DETACHED);
 858
 859         /* everything's ok */
 860
 861         return true;
 862 }
 863
 864
 865 /* threads_table_init *********************************************************
 866
 867    Initialize the global threads table.
 868
 869 ******************************************************************************/
 870
 871 static void threads_table_init(void)
 872 {
 873         s4 size;
 874         s4 i;
 875
 876         size = THREADS_INITIAL_TABLE_SIZE;
 877
 878         threads_table.size = size;
 879         threads_table.table = MNEW(threads_table_entry_t, size);
 880
 881         /* link the entries in a freelist */
 882
 883         for (i=0; i<size; ++i) {
 884                 threads_table.table[i].nextfree = i+1;
 885         }
 886
 887         /* terminate the freelist */
 888
 889         threads_table.table[size-1].nextfree = 0; /* index 0 is never free */
 890 }
 891
 892
 893 /* threads_table_add **********************************************************
 894
 895    Add a thread to the global threads table. The index is entered in the
 896    threadobject. The thinlock value for the thread is pre-computed.
 897
 898    IN:
 899       thread............the thread to add
 900
 901    RETURN VALUE:
 902       The table index for the newly added thread. This value has also been
 903           entered in the threadobject.
 904
 905    PRE-CONDITION:
 906       The caller must hold the threadlistlock!
 907
 908 ******************************************************************************/
 909
 910 static s4 threads_table_add(threadobject *thread)
 911 {
 912         s4 index;
 913         s4 oldsize;
 914         s4 newsize;
 915         s4 i;
 916
 917         /* table[0] serves as the head of the freelist */
 918
 919         index = threads_table.table[0].nextfree;
 920
 921         /* if we got a free index, use it */
 922
 923         if (index) {
 924 got_an_index:
 925                 threads_table.table[0].nextfree = threads_table.table[index].nextfree;
 926                 threads_table.table[index].thread = thread;
 927                 thread->index = index;
 928                 thread->thinlock = lock_pre_compute_thinlock(index);
 929                 return index;
 930         }
 931
 932         /* we must grow the table */
 933
 934         oldsize = threads_table.size;
 935         newsize = oldsize * 2;
 936
 937         threads_table.table = MREALLOC(threads_table.table, threads_table_entry_t,
 938                                                                    oldsize, newsize);
 939         threads_table.size = newsize;
 940
 941         /* link the new entries to a free list */
 942
 943         for (i=oldsize; i<newsize; ++i) {
 944                 threads_table.table[i].nextfree = i+1;
 945         }
 946
 947         /* terminate the freelist */
 948
 949         threads_table.table[newsize-1].nextfree = 0; /* index 0 is never free */
 950
 951         /* use the first of the new entries */
 952
 953         index = oldsize;
 954         goto got_an_index;
 955 }
 956
 957
 958 /* threads_table_remove *******************************************************
 959
 960    Remove a thread from the global threads table.
 961
 962    IN:
 963       thread............the thread to remove
 964
 965    PRE-CONDITION:
 966       The caller must hold the threadlistlock!
 967
 968 ******************************************************************************/
 969
 970 static void threads_table_remove(threadobject *thread)
 971 {
 972         s4 index;
 973
 974         index = thread->index;
 975
 976         /* put the index into the freelist */
 977
 978         threads_table.table[index] = threads_table.table[0];
 979         threads_table.table[0].nextfree = index;
 980
 981         /* delete the index in the threadobject to discover bugs */
 982 #if !defined(NDEBUG)
 983         thread->index = 0;
 984 #endif
 985 }
 986
 987
 988 /* threads_startup_thread ******************************************************
 989
 990    Thread startup function called by pthread_create.
 991
 992    Thread which have a startup.function != NULL are marked as internal
 993    threads. All other threads are threated as normal Java threads.
 994
 995    NOTE: This function is not called directly by pthread_create. The Boehm GC
 996          inserts its own GC_start_routine in between, which then calls
 997                  threads_startup.
 998
 999    IN:
1000       t............the argument passed to pthread_create, ie. a pointer to
1001                        a startupinfo struct. CAUTION: When the `psem` semaphore
1002                                    is posted, the startupinfo struct becomes invalid! (It
1003                                    is allocated on the stack of threads_start_thread.)
1004
1005 ******************************************************************************/
1006
1007 static void *threads_startup_thread(void *t)
1008 {
1009         startupinfo        *startup;
1010         threadobject       *thread;
1011 #if defined(WITH_CLASSPATH_GNU)
1012         java_lang_VMThread *vmt;
1013 #endif
1014         sem_t              *psem;
1015         threadobject       *tnext;
1016         classinfo          *c;
1017         methodinfo         *m;
1018         java_objectheader  *o;
1019         functionptr         function;
1020
1021 #if defined(ENABLE_INTRP)
1022         u1 *intrp_thread_stack;
1023
1024         /* create interpreter stack */
1025
1026         if (opt_intrp) {
1027                 intrp_thread_stack = GCMNEW(u1, opt_stacksize);
1028                 MSET(intrp_thread_stack, 0, u1, opt_stacksize);
1029         }
1030         else
1031                 intrp_thread_stack = NULL;
1032 #endif
1033
1034         /* get passed startupinfo structure and the values in there */
1035
1036         startup = t;
1037         t = NULL; /* make sure it's not used wrongly */
1038
1039         thread   = startup->thread;
1040         function = startup->function;
1041         psem     = startup->psem;
1042
1043         /* Seems like we've encountered a situation where thread->tid was not set by
1044          * pthread_create. We alleviate this problem by waiting for pthread_create
1045          * to return. */
1046         threads_sem_wait(startup->psem_first);
1047
1048         /* set the thread object */
1049
1050 #if defined(__DARWIN__)
1051         thread->mach_thread = mach_thread_self();
1052 #endif
1053         threads_set_current_threadobject(thread);
1054
1055         /* insert the thread into the threadlist and the threads table */
1056
1057         pthread_mutex_lock(&threadlistlock);
1058
1059         thread->prev = mainthreadobj;
1060         thread->next = tnext = mainthreadobj->next;
1061         mainthreadobj->next = thread;
1062         tnext->prev = thread;
1063
1064         threads_table_add(thread);
1065
1066         pthread_mutex_unlock(&threadlistlock);
1067
1068         /* init data structures of this thread */
1069
1070         lock_init_execution_env(thread);
1071
1072         /* tell threads_startup_thread that we registered ourselves */
1073         /* CAUTION: *startup becomes invalid with this!             */
1074
1075         startup = NULL;
1076         threads_sem_post(psem);
1077
1078         /* set our priority */
1079
1080         threads_set_thread_priority(thread->tid, thread->o.priority);
1081
1082 #if defined(ENABLE_INTRP)
1083         /* set interpreter stack */
1084
1085         if (opt_intrp)
1086                 thread->_global_sp = (Cell *) (intrp_thread_stack + opt_stacksize);
1087 #endif
1088
1089 #if defined(ENABLE_JVMTI)
1090         /* fire thread start event */
1091
1092         if (jvmti)
1093                 jvmti_ThreadStartEnd(JVMTI_EVENT_THREAD_START);
1094 #endif
1095
1096         /* find and run the Thread.run()V method if no other function was passed */
1097
1098         if (function == NULL) {
1099                 /* this is a normal Java thread */
1100
1101                 thread->flags |= THREAD_FLAG_JAVA;
1102
1103 #if defined(WITH_CLASSPATH_GNU)
1104                 /* We need to start the run method of
1105                    java.lang.VMThread. Since this is a final class, we can use
1106                    the class object directly. */
1107
1108                 c   = class_java_lang_VMThread;
1109 #elif defined(WITH_CLASSPATH_CLDC1_1)
1110                 c   = thread->o.header.vftbl->class;
1111 #endif
1112
1113                 m = class_resolveclassmethod(c, utf_run, utf_void__void, c, true);
1114
1115                 if (m == NULL)
1116                         throw_exception();
1117
1118                 /* set ThreadMXBean variables */
1119
1120                 _Jv_jvm->java_lang_management_ThreadMXBean_ThreadCount++;
1121                 _Jv_jvm->java_lang_management_ThreadMXBean_TotalStartedThreadCount++;
1122
1123                 if (_Jv_jvm->java_lang_management_ThreadMXBean_ThreadCount >
1124                         _Jv_jvm->java_lang_management_ThreadMXBean_PeakThreadCount)
1125                         _Jv_jvm->java_lang_management_ThreadMXBean_PeakThreadCount =
1126                                 _Jv_jvm->java_lang_management_ThreadMXBean_ThreadCount;
1127
1128 #if defined(WITH_CLASSPATH_GNU)
1129                 /* we need to start the run method of java.lang.VMThread */
1130
1131                 vmt = (java_lang_VMThread *) thread->o.vmThread;
1132                 o   = (java_objectheader *) vmt;
1133
1134 #elif defined(WITH_CLASSPATH_CLDC1_1)
1135                 o   = (java_objectheader *) thread;
1136 #endif
1137
1138                 (void) vm_call_method(m, o);
1139         }
1140         else {
1141                 /* this is an internal thread */
1142
1143                 thread->flags |= THREAD_FLAG_INTERNAL;
1144
1145                 /* set ThreadMXBean variables */
1146
1147                 _Jv_jvm->java_lang_management_ThreadMXBean_ThreadCount++;
1148                 _Jv_jvm->java_lang_management_ThreadMXBean_TotalStartedThreadCount++;
1149
1150                 if (_Jv_jvm->java_lang_management_ThreadMXBean_ThreadCount >
1151                         _Jv_jvm->java_lang_management_ThreadMXBean_PeakThreadCount)
1152                         _Jv_jvm->java_lang_management_ThreadMXBean_PeakThreadCount =
1153                                 _Jv_jvm->java_lang_management_ThreadMXBean_ThreadCount;
1154
1155                 /* call passed function, e.g. finalizer_thread */
1156
1157                 (function)();
1158         }
1159
1160 #if defined(ENABLE_JVMTI)
1161         /* fire thread end event */
1162
1163         if (jvmti)
1164                 jvmti_ThreadStartEnd(JVMTI_EVENT_THREAD_END);
1165 #endif
1166
1167         threads_detach_thread(thread);
1168
1169         /* set ThreadMXBean variables */
1170
1171         _Jv_jvm->java_lang_management_ThreadMXBean_ThreadCount--;
1172
1173         return NULL;
1174 }
1175
1176
1177 /* threads_start_thread ********************************************************
1178
1179    Start a thread in the JVM.
1180
1181    IN:
1182       thread.......the thread object
1183           function.....function to run in the new thread. NULL means that the
1184                        "run" method of the object `t` should be called
1185
1186 ******************************************************************************/
1187
1188 void threads_start_thread(threadobject *thread, functionptr function)
1189 {
1190         sem_t          sem;
1191         sem_t          sem_first;
1192         pthread_attr_t attr;
1193         startupinfo    startup;
1194
1195         /* fill startupinfo structure passed by pthread_create to
1196          * threads_startup_thread */
1197
1198         startup.thread     = thread;
1199         startup.function   = function;       /* maybe we don't call Thread.run()V */
1200         startup.psem       = &sem;
1201         startup.psem_first = &sem_first;
1202
1203         threads_sem_init(&sem, 0, 0);
1204         threads_sem_init(&sem_first, 0, 0);
1205
1206         /* initialize thread attribute object */
1207
1208         if (pthread_attr_init(&attr))
1209                 vm_abort("pthread_attr_init failed: %s", strerror(errno));
1210
1211         /* initialize thread stacksize */
1212
1213         if (pthread_attr_setstacksize(&attr, opt_stacksize))
1214                 vm_abort("pthread_attr_setstacksize failed: %s", strerror(errno));
1215
1216         /* create the thread */
1217
1218         if (pthread_create(&(thread->tid), &attr, threads_startup_thread, &startup))
1219                 vm_abort("pthread_create failed: %s", strerror(errno));
1220
1221         /* signal that pthread_create has returned, so thread->tid is valid */
1222
1223         threads_sem_post(&sem_first);
1224
1225         /* wait here until the thread has entered itself into the thread list */
1226
1227         threads_sem_wait(&sem);
1228
1229         /* cleanup */
1230
1231         sem_destroy(&sem);
1232         sem_destroy(&sem_first);
1233 }
1234
1235
1236 /* threads_set_thread_priority *************************************************
1237
1238    Set the priority of the given thread.
1239
1240    IN:
1241       tid..........thread id
1242           priority.....priority to set
1243
1244 ******************************************************************************/
1245
1246 void threads_set_thread_priority(pthread_t tid, int priority)
1247 {
1248         struct sched_param schedp;
1249         int policy;
1250
1251 #if defined(ENABLE_JAVAME_CLDC1_1)
1252         /* The thread id is zero when a thread is created in Java.  The
1253            priority is set later during startup. */
1254
1255         if (tid == NULL)
1256                 return;
1257 #endif
1258
1259         pthread_getschedparam(tid, &policy, &schedp);
1260         schedp.sched_priority = priority;
1261         pthread_setschedparam(tid, policy, &schedp);
1262 }
1263
1264
1265 /* threads_attach_current_thread ***********************************************
1266
1267    Attaches the current thread to the VM.  Used in JNI.
1268
1269 *******************************************************************************/
1270
1271 bool threads_attach_current_thread(JavaVMAttachArgs *vm_aargs, bool isdaemon)
1272 {
1273         threadobject          *thread;
1274         utf                   *u;
1275         java_lang_String      *s;
1276         java_objectheader     *o;
1277         java_lang_Thread      *t;
1278
1279 #if defined(ENABLE_JAVASE)
1280         java_lang_ThreadGroup *group;
1281         methodinfo            *m;
1282 #endif
1283
1284 #if defined(WITH_CLASSPATH_GNU)
1285         java_lang_VMThread    *vmt;
1286 #endif
1287
1288         /* create a java.lang.Thread object */
1289
1290         thread = (threadobject *) builtin_new(class_java_lang_Thread);
1291
1292         if (thread == NULL)
1293                 return false;
1294
1295         /* cast for convenience */
1296
1297         t = (java_lang_Thread *) thread;
1298
1299         threads_init_threadobject(thread);
1300         threads_set_current_threadobject(thread);
1301         lock_init_execution_env(thread);
1302
1303         /* insert the thread into the threadlist and the threads table */
1304
1305         pthread_mutex_lock(&threadlistlock);
1306
1307         thread->prev        = mainthreadobj;
1308         thread->next        = mainthreadobj->next;
1309         mainthreadobj->next = thread;
1310         thread->next->prev  = thread;
1311
1312         threads_table_add(thread);
1313
1314         pthread_mutex_unlock(&threadlistlock);
1315
1316         /* mark thread as Java thread */
1317
1318         thread->flags = THREAD_FLAG_JAVA;
1319
1320         if (isdaemon)
1321                 thread->flags |= THREAD_FLAG_DAEMON;
1322
1323 #if defined(ENABLE_INTRP)
1324         /* create interpreter stack */
1325
1326         if (opt_intrp) {
1327                 MSET(intrp_main_stack, 0, u1, opt_stacksize);
1328                 thread->_global_sp = (Cell *) (intrp_main_stack + opt_stacksize);
1329         }
1330 #endif
1331
1332 #if defined(WITH_CLASSPATH_GNU)
1333         /* create a java.lang.VMThread object */
1334
1335         vmt = (java_lang_VMThread *) builtin_new(class_java_lang_VMThread);
1336
1337         if (vmt == NULL)
1338                 return false;
1339
1340         /* set the thread */
1341
1342         vmt->thread = t;
1343 #endif
1344
1345         if (vm_aargs != NULL) {
1346                 u     = utf_new_char(vm_aargs->name);
1347 #if defined(ENABLE_JAVASE)
1348                 group = (java_lang_ThreadGroup *) vm_aargs->group;
1349 #endif
1350         }
1351         else {
1352                 u     = utf_null;
1353 #if defined(ENABLE_JAVASE)
1354                 group = mainthreadobj->o.group;
1355 #endif
1356         }
1357
1358         s = javastring_new(u);
1359
1360         o = (java_objectheader *) thread;
1361
1362 #if defined(WITH_CLASSPATH_GNU)
1363         (void) vm_call_method(method_thread_init, o, vmt, s, NORM_PRIORITY,
1364                                                   isdaemon);
1365 #elif defined(WITH_CLASSPATH_CLDC1_1)
1366         (void) vm_call_method(method_thread_init, o, s);
1367 #endif
1368
1369         if (*exceptionptr)
1370                 return false;
1371
1372 #if defined(ENABLE_JAVASE)
1373         /* store the thread group in the object */
1374
1375         thread->o.group = group;
1376
1377         /* add thread to given thread-group */
1378
1379         m = class_resolveclassmethod(group->header.vftbl->class,
1380                                                                  utf_addThread,
1381                                                                  utf_java_lang_Thread__V,
1382                                                                  class_java_lang_ThreadGroup,
1383                                                                  true);
1384
1385         o = (java_objectheader *) group;
1386
1387         (void) vm_call_method(m, o, t);
1388
1389         if (*exceptionptr)
1390                 return false;
1391 #endif
1392
1393         return true;
1394 }
1395
1396
1397 /* threads_detach_thread *******************************************************
1398
1399    Detaches the passed thread from the VM.  Used in JNI.
1400
1401 *******************************************************************************/
1402
1403 bool threads_detach_thread(threadobject *thread)
1404 {
1405 #if defined(ENABLE_JAVASE)
1406         java_lang_ThreadGroup *group;
1407         methodinfo            *m;
1408         java_objectheader     *o;
1409         java_lang_Thread      *t;
1410 #endif
1411
1412         /* Allow lock record pools to be used by other threads. They
1413            cannot be deleted so we'd better not waste them. */
1414
1415         /* XXX We have to find a new way to free lock records */
1416         /*     with the new locking algorithm.                */
1417         /* lock_record_free_pools(thread->ee.lockrecordpools); */
1418
1419         /* XXX implement uncaught exception stuff (like JamVM does) */
1420
1421 #if defined(ENABLE_JAVASE)
1422         /* remove thread from the thread group */
1423
1424         group = thread->o.group;
1425
1426         /* XXX TWISTI: should all threads be in a ThreadGroup? */
1427
1428         if (group != NULL) {
1429                 m = class_resolveclassmethod(group->header.vftbl->class,
1430                                                                          utf_removeThread,
1431                                                                          utf_java_lang_Thread__V,
1432                                                                          class_java_lang_ThreadGroup,
1433                                                                          true);
1434
1435                 if (m == NULL)
1436                         return false;
1437
1438                 o = (java_objectheader *) group;
1439                 t = (java_lang_Thread *) thread;
1440
1441                 (void) vm_call_method(m, o, t);
1442
1443                 if (*exceptionptr)
1444                         return false;
1445         }
1446 #endif
1447
1448         /* remove thread from thread list and threads table, do this
1449            inside a lock */
1450
1451         pthread_mutex_lock(&threadlistlock);
1452
1453         thread->next->prev = thread->prev;
1454         thread->prev->next = thread->next;
1455
1456         threads_table_remove(thread);
1457
1458         pthread_mutex_unlock(&threadlistlock);
1459
1460         /* reset thread id (lock on joinmutex? TWISTI) */
1461
1462         pthread_mutex_lock(&(thread->joinmutex));
1463         thread->tid = 0;
1464         pthread_mutex_unlock(&(thread->joinmutex));
1465
1466         /* tell everyone that a thread has finished */
1467
1468         pthread_cond_broadcast(&(thread->joincond));
1469
1470         return true;
1471 }
1472
1473
1474 /* threads_find_non_daemon_thread **********************************************
1475
1476    Helper function used by threads_join_all_threads for finding
1477    non-daemon threads that are still running.
1478
1479 *******************************************************************************/
1480
1481 /* At the end of the program, we wait for all running non-daemon
1482    threads to die. */
1483
1484 static threadobject *threads_find_non_daemon_thread(threadobject *thread)
1485 {
1486         while (thread != mainthreadobj) {
1487                 if (!(thread->flags & THREAD_FLAG_DAEMON))
1488                         return thread;
1489
1490                 thread = thread->prev;
1491         }
1492
1493         return NULL;
1494 }
1495
1496
1497 /* threads_join_all_threads ****************************************************
1498
1499    Join all non-daemon threads.
1500
1501 *******************************************************************************/
1502
1503 void threads_join_all_threads(void)
1504 {
1505         threadobject *thread;
1506
1507         pthread_mutex_lock(&threadlistlock);
1508
1509         while ((thread = threads_find_non_daemon_thread(mainthreadobj->prev)) != NULL) {
1510                 pthread_mutex_lock(&(thread->joinmutex));
1511
1512                 pthread_mutex_unlock(&threadlistlock);
1513
1514                 while (thread->tid)
1515                         pthread_cond_wait(&(thread->joincond), &(thread->joinmutex));
1516
1517                 pthread_mutex_unlock(&(thread->joinmutex));
1518
1519                 pthread_mutex_lock(&threadlistlock);
1520         }
1521
1522         pthread_mutex_unlock(&threadlistlock);
1523 }
1524
1525
1526 /* threads_timespec_earlier ****************************************************
1527
1528    Return true if timespec tv1 is earlier than timespec tv2.
1529
1530    IN:
1531       tv1..........first timespec
1532           tv2..........second timespec
1533
1534    RETURN VALUE:
1535       true, if the first timespec is earlier
1536
1537 *******************************************************************************/
1538
1539 static inline bool threads_timespec_earlier(const struct timespec *tv1,
1540                                                                                         const struct timespec *tv2)
1541 {
1542         return (tv1->tv_sec < tv2->tv_sec)
1543                                 ||
1544                 (tv1->tv_sec == tv2->tv_sec && tv1->tv_nsec < tv2->tv_nsec);
1545 }
1546
1547
1548 /* threads_current_time_is_earlier_than ****************************************
1549
1550    Check if the current time is earlier than the given timespec.
1551
1552    IN:
1553       tv...........the timespec to compare against
1554
1555    RETURN VALUE:
1556       true, if the current time is earlier
1557
1558 *******************************************************************************/
1559
1560 static bool threads_current_time_is_earlier_than(const struct timespec *tv)
1561 {
1562         struct timeval tvnow;
1563         struct timespec tsnow;
1564
1565         /* get current time */
1566
1567         if (gettimeofday(&tvnow, NULL) != 0)
1568                 vm_abort("gettimeofday failed: %s\n", strerror(errno));
1569
1570         /* convert it to a timespec */
1571
1572         tsnow.tv_sec = tvnow.tv_sec;
1573         tsnow.tv_nsec = tvnow.tv_usec * 1000;
1574
1575         /* compare current time with the given timespec */
1576
1577         return threads_timespec_earlier(&tsnow, tv);
1578 }
1579
1580
1581 /* threads_wait_with_timeout ***************************************************
1582
1583    Wait until the given point in time on a monitor until either
1584    we are notified, we are interrupted, or the time is up.
1585
1586    IN:
1587       t............the current thread
1588           wakeupTime...absolute (latest) wakeup time
1589                            If both tv_sec and tv_nsec are zero, this function
1590                                            waits for an unlimited amount of time.
1591
1592    RETURN VALUE:
1593       true.........if the wait has been interrupted,
1594           false........if the wait was ended by notification or timeout
1595
1596 *******************************************************************************/
1597
1598 static bool threads_wait_with_timeout(threadobject *thread,
1599                                                                           struct timespec *wakeupTime)
1600 {
1601         bool wasinterrupted;
1602
1603         /* acquire the waitmutex */
1604
1605         pthread_mutex_lock(&thread->waitmutex);
1606
1607         /* mark us as sleeping */
1608
1609         thread->sleeping = true;
1610
1611         /* wait on waitcond */
1612
1613         if (wakeupTime->tv_sec || wakeupTime->tv_nsec) {
1614                 /* with timeout */
1615                 while (!thread->interrupted && !thread->signaled
1616                            && threads_current_time_is_earlier_than(wakeupTime))
1617                 {
1618                         pthread_cond_timedwait(&thread->waitcond, &thread->waitmutex,
1619                                                                    wakeupTime);
1620                 }
1621         }
1622         else {
1623                 /* no timeout */
1624                 while (!thread->interrupted && !thread->signaled)
1625                         pthread_cond_wait(&thread->waitcond, &thread->waitmutex);
1626         }
1627
1628         /* check if we were interrupted */
1629
1630         wasinterrupted = thread->interrupted;
1631
1632         /* reset all flags */
1633
1634         thread->interrupted = false;
1635         thread->signaled    = false;
1636         thread->sleeping    = false;
1637
1638         /* release the waitmutex */
1639
1640         pthread_mutex_unlock(&thread->waitmutex);
1641
1642         return wasinterrupted;
1643 }
1644
1645
1646 /* threads_wait_with_timeout_relative ******************************************
1647
1648    Wait for the given maximum amount of time on a monitor until either
1649    we are notified, we are interrupted, or the time is up.
1650
1651    IN:
1652       t............the current thread
1653           millis.......milliseconds to wait
1654           nanos........nanoseconds to wait
1655
1656    RETURN VALUE:
1657       true.........if the wait has been interrupted,
1658           false........if the wait was ended by notification or timeout
1659
1660 *******************************************************************************/
1661
1662 bool threads_wait_with_timeout_relative(threadobject *thread, s8 millis,
1663                                                                                 s4 nanos)
1664 {
1665         struct timespec wakeupTime;
1666
1667         /* calculate the the (latest) wakeup time */
1668
1669         threads_calc_absolute_time(&wakeupTime, millis, nanos);
1670
1671         /* wait */
1672
1673         return threads_wait_with_timeout(thread, &wakeupTime);
1674 }
1675
1676
1677 /* threads_calc_absolute_time **************************************************
1678
1679    Calculate the absolute point in time a given number of ms and ns from now.
1680
1681    IN:
1682       millis............milliseconds from now
1683           nanos.............nanoseconds from now
1684
1685    OUT:
1686       *tm...............receives the timespec of the absolute point in time
1687
1688 *******************************************************************************/
1689
1690 static void threads_calc_absolute_time(struct timespec *tm, s8 millis, s4 nanos)
1691 {
1692         if ((millis != 0x7fffffffffffffffLLU) && (millis || nanos)) {
1693                 struct timeval tv;
1694                 long nsec;
1695                 gettimeofday(&tv, NULL);
1696                 tv.tv_sec += millis / 1000;
1697                 millis %= 1000;
1698                 nsec = tv.tv_usec * 1000 + (s4) millis * 1000000 + nanos;
1699                 tm->tv_sec = tv.tv_sec + nsec / 1000000000;
1700                 tm->tv_nsec = nsec % 1000000000;
1701         }
1702         else {
1703                 tm->tv_sec = 0;
1704                 tm->tv_nsec = 0;
1705         }
1706 }
1707
1708
1709 /* threads_thread_interrupt ****************************************************
1710
1711    Interrupt the given thread.
1712
1713    The thread gets the "waitcond" signal and
1714    its interrupted flag is set to true.
1715
1716    IN:
1717       thread............the thread to interrupt
1718
1719 *******************************************************************************/
1720
1721 void threads_thread_interrupt(threadobject *thread)
1722 {
1723         /* Signal the thread a "waitcond" and tell it that it has been
1724            interrupted. */
1725
1726         pthread_mutex_lock(&thread->waitmutex);
1727
1728         /* Interrupt blocking system call using a signal. */
1729
1730         pthread_kill(thread->tid, SIGHUP);
1731
1732         if (thread->sleeping)
1733                 pthread_cond_signal(&thread->waitcond);
1734
1735         thread->interrupted = true;
1736
1737         pthread_mutex_unlock(&thread->waitmutex);
1738 }
1739
1740
1741 /* threads_check_if_interrupted_and_reset **************************************
1742
1743    Check if the current thread has been interrupted and reset the
1744    interruption flag.
1745
1746    RETURN VALUE:
1747       true, if the current thread had been interrupted
1748
1749 *******************************************************************************/
1750
1751 bool threads_check_if_interrupted_and_reset(void)
1752 {
1753         threadobject *thread;
1754         bool intr;
1755
1756         thread = THREADOBJECT;
1757
1758         /* get interrupted flag */
1759
1760         intr = thread->interrupted;
1761
1762         /* reset interrupted flag */
1763
1764         thread->interrupted = false;
1765
1766         return intr;
1767 }
1768
1769
1770 /* threads_thread_has_been_interrupted *****************************************
1771
1772    Check if the given thread has been interrupted
1773
1774    IN:
1775       t............the thread to check
1776
1777    RETURN VALUE:
1778       true, if the given thread had been interrupted
1779
1780 *******************************************************************************/
1781
1782 bool threads_thread_has_been_interrupted(threadobject *thread)
1783 {
1784         return thread->interrupted;
1785 }
1786
1787
1788 /* threads_sleep ***************************************************************
1789
1790    Sleep the current thread for the specified amount of time.
1791
1792 *******************************************************************************/
1793
1794 void threads_sleep(s8 millis, s4 nanos)
1795 {
1796         threadobject    *thread;
1797         struct timespec  wakeupTime;
1798         bool             wasinterrupted;
1799
1800         thread = THREADOBJECT;
1801
1802         threads_calc_absolute_time(&wakeupTime, millis, nanos);
1803
1804         wasinterrupted = threads_wait_with_timeout(thread, &wakeupTime);
1805
1806         if (wasinterrupted)
1807                 exceptions_throw_interruptedexception();
1808 }
1809
1810
1811 /* threads_yield ***************************************************************
1812
1813    Yield to the scheduler.
1814
1815 *******************************************************************************/
1816
1817 void threads_yield(void)
1818 {
1819         sched_yield();
1820 }
1821
1822
1823 /* threads_dump ****************************************************************
1824
1825    Dumps info for all threads running in the JVM. This function is
1826    called when SIGQUIT (<ctrl>-\) is sent to CACAO.
1827
1828 *******************************************************************************/
1829
1830 void threads_dump(void)
1831 {
1832         threadobject     *thread;
1833         java_lang_Thread *t;
1834         utf              *name;
1835
1836         thread = mainthreadobj;
1837
1838         /* XXX we should stop the world here */
1839
1840         printf("Full thread dump CACAO "VERSION":\n");
1841
1842         /* iterate over all started threads */
1843
1844         do {
1845                 /* get thread object */
1846
1847                 t = (java_lang_Thread *) thread;
1848
1849                 /* the thread may be currently in initalization, don't print it */
1850
1851                 if (t != NULL) {
1852                         /* get thread name */
1853
1854 #if defined(ENABLE_JAVASE)
1855                         name = javastring_toutf(t->name, false);
1856 #elif defined(ENABLE_JAVAME_CLDC1_1)
1857                         name = t->name;
1858 #endif
1859
1860                         printf("\n\"");
1861                         utf_display_printable_ascii(name);
1862                         printf("\" ");
1863
1864                         if (thread->flags & THREAD_FLAG_DAEMON)
1865                                 printf("daemon ");
1866
1867 #if SIZEOF_VOID_P == 8
1868                         printf("prio=%d tid=0x%016lx\n", t->priority, (ptrint) thread->tid);
1869 #else
1870                         printf("prio=%d tid=0x%08lx\n", t->priority, (ptrint) thread->tid);
1871 #endif
1872
1873                         /* dump trace of thread */
1874
1875                         stacktrace_dump_trace(thread);
1876                 }
1877
1878                 thread = thread->next;
1879         } while ((thread != NULL) && (thread != mainthreadobj));
1880 }
1881
1882
1883 /* threads_table_dump *********************************************************
1884
1885    Dump the threads table for debugging purposes.
1886
1887    IN:
1888       file..............stream to write to
1889
1890 ******************************************************************************/
1891
1892 #if !defined(NDEBUG) && 0
1893 static void threads_table_dump(FILE *file)
1894 {
1895         s4 i;
1896         s4 size;
1897         ptrint index;
1898
1899         pthread_mutex_lock(&threadlistlock);
1900
1901         size = threads_table.size;
1902
1903         fprintf(file, "======== THREADS TABLE (size %d) ========\n", size);
1904
1905         for (i=0; i<size; ++i) {
1906                 index = threads_table.table[i].nextfree;
1907
1908                 fprintf(file, "%4d: ", i);
1909
1910                 if (index < size) {
1911                         fprintf(file, "free, nextfree = %d\n", (int) index);
1912                 }
1913                 else {
1914                         fprintf(file, "thread %p\n", (void*) threads_table.table[i].thread);
1915                 }
1916         }
1917
1918         fprintf(file, "======== END OF THREADS TABLE ========\n");
1919
1920         pthread_mutex_unlock(&threadlistlock);
1921 }
1922 #endif
1923
1924 /*
1925  * These are local overrides for various environment variables in Emacs.
1926  * Please do not remove this and leave it at the end of the file, where
1927  * Emacs will automagically detect them.
1928  * ---------------------------------------------------------------------
1929  * Local variables:
1930  * mode: c
1931  * indent-tabs-mode: t
1932  * c-basic-offset: 4
1933  * tab-width: 4
1934  * End:
1935  * vim:noexpandtab:sw=4:ts=4:
1936  */