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 8304 2007-08-14 19:57:20Z pm $
  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/llni.h"
  61 #include "native/native.h"
  62 #include "native/include/java_lang_Object.h"
  63 #include "native/include/java_lang_String.h"
  64 #include "native/include/java_lang_Throwable.h"
  65 #include "native/include/java_lang_Thread.h"
  66
  67 #if defined(ENABLE_JAVASE)
  68 # include "native/include/java_lang_ThreadGroup.h"
  69 #endif
  70
  71 #if defined(WITH_CLASSPATH_GNU)
  72 # include "native/include/java_lang_VMThread.h"
  73 #endif
  74
  75 #include "threads/lock-common.h"
  76 #include "threads/threads-common.h"
  77
  78 #include "threads/native/threads.h"
  79
  80 #include "toolbox/logging.h"
  81
  82 #include "vm/builtin.h"
  83 #include "vm/exceptions.h"
  84 #include "vm/global.h"
  85 #include "vm/stringlocal.h"
  86 #include "vm/vm.h"
  87
  88 #include "vm/jit/asmpart.h"
  89
  90 #include "vmcore/options.h"
  91
  92 #if defined(ENABLE_STATISTICS)
  93 # include "vmcore/statistics.h"
  94 #endif
  95
  96 #if !defined(__DARWIN__)
  97 # if defined(__LINUX__)
  98 #  define GC_LINUX_THREADS
  99 # elif defined(__MIPS__)
 100 #  define GC_IRIX_THREADS
 101 # endif
 102 # include <semaphore.h>
 103 # if defined(ENABLE_GC_BOEHM)
 104 #  include "mm/boehm-gc/include/gc.h"
 105 # endif
 106 #endif
 107
 108 #if defined(ENABLE_JVMTI)
 109 #include "native/jvmti/cacaodbg.h"
 110 #endif
 111
 112 #if defined(__DARWIN__)
 113 /* Darwin has no working semaphore implementation.  This one is taken
 114    from Boehm-GC. */
 115
 116 /*
 117    This is a very simple semaphore implementation for darwin. It
 118    is implemented in terms of pthreads calls so it isn't async signal
 119    safe. This isn't a problem because signals aren't used to
 120    suspend threads on darwin.
 121 */
 122
 123 static int sem_init(sem_t *sem, int pshared, int value)
 124 {
 125         if (pshared)
 126                 assert(0);
 127
 128         sem->value = value;
 129
 130         if (pthread_mutex_init(&sem->mutex, NULL) < 0)
 131                 return -1;
 132
 133         if (pthread_cond_init(&sem->cond, NULL) < 0)
 134                 return -1;
 135
 136         return 0;
 137 }
 138
 139 static int sem_post(sem_t *sem)
 140 {
 141         if (pthread_mutex_lock(&sem->mutex) < 0)
 142                 return -1;
 143
 144         sem->value++;
 145
 146         if (pthread_cond_signal(&sem->cond) < 0) {
 147                 pthread_mutex_unlock(&sem->mutex);
 148                 return -1;
 149         }
 150
 151         if (pthread_mutex_unlock(&sem->mutex) < 0)
 152                 return -1;
 153
 154         return 0;
 155 }
 156
 157 static int sem_wait(sem_t *sem)
 158 {
 159         if (pthread_mutex_lock(&sem->mutex) < 0)
 160                 return -1;
 161
 162         while (sem->value == 0) {
 163                 pthread_cond_wait(&sem->cond, &sem->mutex);
 164         }
 165
 166         sem->value--;
 167
 168         if (pthread_mutex_unlock(&sem->mutex) < 0)
 169                 return -1;
 170
 171         return 0;
 172 }
 173
 174 static int sem_destroy(sem_t *sem)
 175 {
 176         if (pthread_cond_destroy(&sem->cond) < 0)
 177                 return -1;
 178
 179         if (pthread_mutex_destroy(&sem->mutex) < 0)
 180                 return -1;
 181
 182         return 0;
 183 }
 184 #endif /* defined(__DARWIN__) */
 185
 186
 187 /* internally used constants **************************************************/
 188
 189 /* CAUTION: Do not change these values. Boehm GC code depends on them.        */
 190 #define STOPWORLD_FROM_GC               1
 191 #define STOPWORLD_FROM_CLASS_NUMBERING  2
 192
 193
 194 /* startupinfo *****************************************************************
 195
 196    Struct used to pass info from threads_start_thread to
 197    threads_startup_thread.
 198
 199 ******************************************************************************/
 200
 201 typedef struct {
 202         threadobject *thread;      /* threadobject for this thread             */
 203         functionptr   function;    /* function to run in the new thread        */
 204         sem_t        *psem;        /* signals when thread has been entered     */
 205                                    /* in the thread list                       */
 206         sem_t        *psem_first;  /* signals when pthread_create has returned */
 207 } startupinfo;
 208
 209
 210 /* prototypes *****************************************************************/
 211
 212 static void threads_calc_absolute_time(struct timespec *tm, s8 millis, s4 nanos);
 213
 214
 215 /******************************************************************************/
 216 /* GLOBAL VARIABLES                                                           */
 217 /******************************************************************************/
 218
 219 static methodinfo *method_thread_init;
 220
 221 /* the thread object of the current thread                                    */
 222 /* This is either a thread-local variable defined with __thread, or           */
 223 /* a thread-specific value stored with key threads_current_threadobject_key.  */
 224 #if defined(HAVE___THREAD)
 225 __thread threadobject *threads_current_threadobject;
 226 #else
 227 pthread_key_t threads_current_threadobject_key;
 228 #endif
 229
 230 /* global mutex for the threads table */
 231 static pthread_mutex_t mutex_threads_list;
 232
 233 /* global mutex for stop-the-world                                            */
 234 static pthread_mutex_t stopworldlock;
 235
 236 /* global mutex and condition for joining threads on exit */
 237 static pthread_mutex_t mutex_join;
 238 static pthread_cond_t  cond_join;
 239
 240 /* XXX We disable that whole bunch of code until we have the exact-GC
 241    running. */
 242
 243 #if 0
 244
 245 /* this is one of the STOPWORLD_FROM_ constants, telling why the world is     */
 246 /* being stopped                                                              */
 247 static volatile int stopworldwhere;
 248
 249 /* semaphore used for acknowleding thread suspension                          */
 250 static sem_t suspend_ack;
 251 #if defined(__MIPS__)
 252 static pthread_mutex_t suspend_ack_lock = PTHREAD_MUTEX_INITIALIZER;
 253 static pthread_cond_t suspend_cond = PTHREAD_COND_INITIALIZER;
 254 #endif
 255
 256 #endif /* 0 */
 257
 258 /* mutexes used by the fake atomic instructions                               */
 259 #if defined(USE_FAKE_ATOMIC_INSTRUCTIONS)
 260 pthread_mutex_t _atomic_add_lock = PTHREAD_MUTEX_INITIALIZER;
 261 pthread_mutex_t _cas_lock = PTHREAD_MUTEX_INITIALIZER;
 262 pthread_mutex_t _mb_lock = PTHREAD_MUTEX_INITIALIZER;
 263 #endif
 264
 265
 266 /* threads_sem_init ************************************************************
 267
 268    Initialize a semaphore. Checks against errors and interruptions.
 269
 270    IN:
 271        sem..............the semaphore to initialize
 272            shared...........true if this semaphore will be shared between processes
 273            value............the initial value for the semaphore
 274
 275 *******************************************************************************/
 276
 277 void threads_sem_init(sem_t *sem, bool shared, int value)
 278 {
 279         int r;
 280
 281         assert(sem);
 282
 283         do {
 284                 r = sem_init(sem, shared, value);
 285                 if (r == 0)
 286                         return;
 287         } while (errno == EINTR);
 288
 289         vm_abort("sem_init failed: %s", strerror(errno));
 290 }
 291
 292
 293 /* threads_sem_wait ************************************************************
 294
 295    Wait for a semaphore, non-interruptible.
 296
 297    IMPORTANT: Always use this function instead of `sem_wait` directly, as
 298               `sem_wait` may be interrupted by signals!
 299
 300    IN:
 301        sem..............the semaphore to wait on
 302
 303 *******************************************************************************/
 304
 305 void threads_sem_wait(sem_t *sem)
 306 {
 307         int r;
 308
 309         assert(sem);
 310
 311         do {
 312                 r = sem_wait(sem);
 313                 if (r == 0)
 314                         return;
 315         } while (errno == EINTR);
 316
 317         vm_abort("sem_wait failed: %s", strerror(errno));
 318 }
 319
 320
 321 /* threads_sem_post ************************************************************
 322
 323    Increase the count of a semaphore. Checks for errors.
 324
 325    IN:
 326        sem..............the semaphore to increase the count of
 327
 328 *******************************************************************************/
 329
 330 void threads_sem_post(sem_t *sem)
 331 {
 332         int r;
 333
 334         assert(sem);
 335
 336         /* unlike sem_wait, sem_post is not interruptible */
 337
 338         r = sem_post(sem);
 339         if (r == 0)
 340                 return;
 341
 342         vm_abort("sem_post failed: %s", strerror(errno));
 343 }
 344
 345
 346 /* lock_stopworld **************************************************************
 347
 348    Enter the stopworld lock, specifying why the world shall be stopped.
 349
 350    IN:
 351       where........ STOPWORLD_FROM_GC              (1) from within GC
 352                     STOPWORLD_FROM_CLASS_NUMBERING (2) class numbering
 353
 354 ******************************************************************************/
 355
 356 void lock_stopworld(int where)
 357 {
 358         pthread_mutex_lock(&stopworldlock);
 359 /*      stopworldwhere = where; */
 360 }
 361
 362
 363 /* unlock_stopworld ************************************************************
 364
 365    Release the stopworld lock.
 366
 367 ******************************************************************************/
 368
 369 void unlock_stopworld(void)
 370 {
 371 /*      stopworldwhere = 0; */
 372         pthread_mutex_unlock(&stopworldlock);
 373 }
 374
 375 /* XXX We disable that whole bunch of code until we have the exact-GC
 376    running. */
 377
 378 #if 0
 379
 380 #if !defined(__DARWIN__)
 381 /* Caller must hold threadlistlock */
 382 static s4 threads_cast_sendsignals(s4 sig)
 383 {
 384         threadobject *t;
 385         threadobject *self;
 386         s4            count;
 387
 388         self = THREADOBJECT;
 389
 390         /* iterate over all started threads */
 391
 392         count = 0;
 393
 394         for (t = threads_list_first(); t != NULL; t = threads_list_next(t)) {
 395                 /* don't send the signal to ourself */
 396
 397                 if (t == self)
 398                         continue;
 399
 400                 /* don't send the signal to NEW threads (because they are not
 401                    completely initialized) */
 402
 403                 if (t->state == THREAD_STATE_NEW)
 404                         continue;
 405
 406                 /* send the signal */
 407
 408                 pthread_kill(t->tid, sig);
 409
 410                 /* increase threads count */
 411
 412                 count++;
 413         }
 414
 415         return count;
 416 }
 417
 418 #else
 419
 420 static void threads_cast_darwinstop(void)
 421 {
 422         threadobject *tobj = mainthreadobj;
 423         threadobject *self = THREADOBJECT;
 424
 425         do {
 426                 if (tobj != self)
 427                 {
 428                         thread_state_flavor_t flavor = MACHINE_THREAD_STATE;
 429                         mach_msg_type_number_t thread_state_count = MACHINE_THREAD_STATE_COUNT;
 430 #if defined(__I386__)
 431                         i386_thread_state_t thread_state;
 432 #else
 433                         ppc_thread_state_t thread_state;
 434 #endif
 435                         mach_port_t thread = tobj->mach_thread;
 436                         kern_return_t r;
 437
 438                         r = thread_suspend(thread);
 439
 440                         if (r != KERN_SUCCESS)
 441                                 vm_abort("thread_suspend failed");
 442
 443                         r = thread_get_state(thread, flavor, (natural_t *) &thread_state,
 444                                                                  &thread_state_count);
 445
 446                         if (r != KERN_SUCCESS)
 447                                 vm_abort("thread_get_state failed");
 448
 449                         md_critical_section_restart((ucontext_t *) &thread_state);
 450
 451                         r = thread_set_state(thread, flavor, (natural_t *) &thread_state,
 452                                                                  thread_state_count);
 453
 454                         if (r != KERN_SUCCESS)
 455                                 vm_abort("thread_set_state failed");
 456                 }
 457
 458                 tobj = tobj->next;
 459         } while (tobj != mainthreadobj);
 460 }
 461
 462 static void threads_cast_darwinresume(void)
 463 {
 464         threadobject *tobj = mainthreadobj;
 465         threadobject *self = THREADOBJECT;
 466
 467         do {
 468                 if (tobj != self)
 469                 {
 470                         mach_port_t thread = tobj->mach_thread;
 471                         kern_return_t r;
 472
 473                         r = thread_resume(thread);
 474
 475                         if (r != KERN_SUCCESS)
 476                                 vm_abort("thread_resume failed");
 477                 }
 478
 479                 tobj = tobj->next;
 480         } while (tobj != mainthreadobj);
 481 }
 482
 483 #endif
 484
 485 #if defined(__MIPS__)
 486 static void threads_cast_irixresume(void)
 487 {
 488         pthread_mutex_lock(&suspend_ack_lock);
 489         pthread_cond_broadcast(&suspend_cond);
 490         pthread_mutex_unlock(&suspend_ack_lock);
 491 }
 492 #endif
 493
 494 #if !defined(DISABLE_GC)
 495
 496 void threads_cast_stopworld(void)
 497 {
 498 #if !defined(__DARWIN__) && !defined(__CYGWIN__)
 499         s4 count, i;
 500 #endif
 501
 502         lock_stopworld(STOPWORLD_FROM_CLASS_NUMBERING);
 503
 504         /* lock the threads lists */
 505
 506         threads_list_lock();
 507
 508 #if defined(__DARWIN__)
 509         threads_cast_darwinstop();
 510 #elif defined(__CYGWIN__)
 511         /* TODO */
 512         assert(0);
 513 #else
 514         /* send all threads the suspend signal */
 515
 516         count = threads_cast_sendsignals(GC_signum1());
 517
 518         /* wait for all threads signaled to suspend */
 519
 520         for (i = 0; i < count; i++)
 521                 threads_sem_wait(&suspend_ack);
 522 #endif
 523
 524         /* ATTENTION: Don't unlock the threads-lists here so that
 525            non-signaled NEW threads can't change their state and execute
 526            code. */
 527 }
 528
 529
 530 void threads_cast_startworld(void)
 531 {
 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         (void) threads_cast_sendsignals(GC_signum2());
 541 #endif
 542
 543         /* unlock the threads lists */
 544
 545         threads_list_unlock();
 546
 547         unlock_stopworld();
 548 }
 549
 550
 551 #if !defined(__DARWIN__)
 552 static void threads_sigsuspend_handler(ucontext_t *_uc)
 553 {
 554         int sig;
 555         sigset_t sigs;
 556
 557         /* XXX TWISTI: this is just a quick hack */
 558 #if defined(ENABLE_JIT)
 559         md_critical_section_restart(_uc);
 560 #endif
 561
 562         /* Do as Boehm does. On IRIX a condition variable is used for wake-up
 563            (not POSIX async-safe). */
 564 #if defined(__IRIX__)
 565         pthread_mutex_lock(&suspend_ack_lock);
 566         threads_sem_post(&suspend_ack);
 567         pthread_cond_wait(&suspend_cond, &suspend_ack_lock);
 568         pthread_mutex_unlock(&suspend_ack_lock);
 569 #elif defined(__CYGWIN__)
 570         /* TODO */
 571         assert(0);
 572 #else
 573         threads_sem_post(&suspend_ack);
 574
 575         sig = GC_signum2();
 576         sigfillset(&sigs);
 577         sigdelset(&sigs, sig);
 578         sigsuspend(&sigs);
 579 #endif
 580 }
 581
 582 #endif
 583
 584
 585 /* This function is called from Boehm GC code. */
 586
 587 int cacao_suspendhandler(ucontext_t *_uc)
 588 {
 589         if (stopworldwhere != STOPWORLD_FROM_CLASS_NUMBERING)
 590                 return 0;
 591
 592         threads_sigsuspend_handler(_uc);
 593         return 1;
 594 }
 595
 596 #endif /* DISABLE_GC */
 597
 598 #endif /* 0 */
 599
 600
 601 /* threads_set_current_threadobject ********************************************
 602
 603    Set the current thread object.
 604
 605    IN:
 606       thread.......the thread object to set
 607
 608 *******************************************************************************/
 609
 610 void threads_set_current_threadobject(threadobject *thread)
 611 {
 612 #if !defined(HAVE___THREAD)
 613         if (pthread_setspecific(threads_current_threadobject_key, thread) != 0)
 614                 vm_abort("threads_set_current_threadobject: pthread_setspecific failed: %s", strerror(errno));
 615 #else
 616         threads_current_threadobject = thread;
 617 #endif
 618 }
 619
 620
 621 /* threads_impl_thread_new *****************************************************
 622
 623    Initialize implementation fields of a threadobject.
 624
 625    IN:
 626       t....the threadobject
 627
 628 *******************************************************************************/
 629
 630 void threads_impl_thread_new(threadobject *t)
 631 {
 632         /* get the pthread id */
 633
 634         t->tid = pthread_self();
 635
 636         /* initialize the mutex and the condition */
 637
 638         pthread_mutex_init(&(t->waitmutex), NULL);
 639         pthread_cond_init(&(t->waitcond), NULL);
 640
 641 #if defined(ENABLE_DEBUG_FILTER)
 642         /* Initialize filter counters */
 643         t->filterverbosecallctr[0] = 0;
 644         t->filterverbosecallctr[1] = 0;
 645 #endif
 646
 647 #if !defined(NDEBUG)
 648         t->tracejavacallindent = 0;
 649         t->tracejavacallcount = 0;
 650 #endif
 651 }
 652
 653
 654 /* threads_impl_thread_free ****************************************************
 655
 656    Cleanup thread stuff.
 657
 658    IN:
 659       t....the threadobject
 660
 661 *******************************************************************************/
 662
 663 void threads_impl_thread_free(threadobject *t)
 664 {
 665         /* destroy the mutex and the condition */
 666
 667         if (pthread_mutex_destroy(&(t->waitmutex)) != 0)
 668                 vm_abort("threads_impl_thread_free: pthread_mutex_destroy failed: %s",
 669                                  strerror(errno));
 670
 671         if (pthread_cond_destroy(&(t->waitcond)) != 0)
 672                 vm_abort("threads_impl_thread_free: pthread_cond_destroy failed: %s",
 673                                  strerror(errno));
 674 }
 675
 676
 677 /* threads_get_current_threadobject ********************************************
 678
 679    Return the threadobject of the current thread.
 680
 681    RETURN VALUE:
 682        the current threadobject * (an instance of java.lang.Thread)
 683
 684 *******************************************************************************/
 685
 686 threadobject *threads_get_current_threadobject(void)
 687 {
 688         return THREADOBJECT;
 689 }
 690
 691
 692 /* threads_impl_preinit ********************************************************
 693
 694    Do some early initialization of stuff required.
 695
 696    ATTENTION: Do NOT use any Java heap allocation here, as gc_init()
 697    is called AFTER this function!
 698
 699 *******************************************************************************/
 700
 701 void threads_impl_preinit(void)
 702 {
 703         pthread_mutex_init(&stopworldlock, NULL);
 704
 705         /* initialize exit mutex and condition (on exit we join all
 706            threads) */
 707
 708         pthread_mutex_init(&mutex_join, NULL);
 709         pthread_cond_init(&cond_join, NULL);
 710
 711         /* initialize the threads-list mutex */
 712
 713         pthread_mutex_init(&mutex_threads_list, NULL);
 714
 715 #if !defined(HAVE___THREAD)
 716         pthread_key_create(&threads_current_threadobject_key, NULL);
 717 #endif
 718
 719 /*      threads_sem_init(&suspend_ack, 0, 0); */
 720 }
 721
 722
 723 /* threads_list_lock ***********************************************************
 724
 725    Enter the threads table mutex.
 726
 727    NOTE: We need this function as we can't use an internal lock for
 728          the threads lists because the thread's lock is initialized in
 729          threads_table_add (when we have the thread index), but we
 730          already need the lock at the entry of the function.
 731
 732 *******************************************************************************/
 733
 734 void threads_list_lock(void)
 735 {
 736         if (pthread_mutex_lock(&mutex_threads_list) != 0)
 737                 vm_abort("threads_list_lock: pthread_mutex_lock failed: %s",
 738                                  strerror(errno));
 739 }
 740
 741
 742 /* threads_list_unlock *********************************************************
 743
 744    Leave the threads list mutex.
 745
 746 *******************************************************************************/
 747
 748 void threads_list_unlock(void)
 749 {
 750         if (pthread_mutex_unlock(&mutex_threads_list) != 0)
 751                 vm_abort("threads_list_unlock: pthread_mutex_unlock failed: %s",
 752                                  strerror(errno));
 753 }
 754
 755
 756 /* threads_mutex_join_lock *****************************************************
 757
 758    Enter the join mutex.
 759
 760 *******************************************************************************/
 761
 762 void threads_mutex_join_lock(void)
 763 {
 764         if (pthread_mutex_lock(&mutex_join) != 0)
 765                 vm_abort("threads_mutex_join_lock: pthread_mutex_lock failed: %s",
 766                                  strerror(errno));
 767 }
 768
 769
 770 /* threads_mutex_join_unlock ***************************************************
 771
 772    Leave the join mutex.
 773
 774 *******************************************************************************/
 775
 776 void threads_mutex_join_unlock(void)
 777 {
 778         if (pthread_mutex_unlock(&mutex_join) != 0)
 779                 vm_abort("threads_mutex_join_unlock: pthread_mutex_unlock failed: %s",
 780                                  strerror(errno));
 781 }
 782
 783
 784 /* threads_init ****************************************************************
 785
 786    Initializes the threads required by the JVM: main, finalizer.
 787
 788 *******************************************************************************/
 789
 790 bool threads_init(void)
 791 {
 792         threadobject     *mainthread;
 793         java_handle_t    *threadname;
 794         java_lang_Thread *t;
 795         java_handle_t    *o;
 796
 797 #if defined(ENABLE_JAVASE)
 798         java_lang_ThreadGroup *threadgroup;
 799         methodinfo            *m;
 800 #endif
 801
 802 #if defined(WITH_CLASSPATH_GNU)
 803         java_lang_VMThread    *vmt;
 804 #endif
 805
 806         pthread_attr_t attr;
 807
 808         /* get methods we need in this file */
 809
 810 #if defined(WITH_CLASSPATH_GNU)
 811         method_thread_init =
 812                 class_resolveclassmethod(class_java_lang_Thread,
 813                                                                  utf_init,
 814                                                                  utf_new_char("(Ljava/lang/VMThread;Ljava/lang/String;IZ)V"),
 815                                                                  class_java_lang_Thread,
 816                                                                  true);
 817 #else
 818         method_thread_init =
 819                 class_resolveclassmethod(class_java_lang_Thread,
 820                                                                  utf_init,
 821                                                                  utf_new_char("(Ljava/lang/String;)V"),
 822                                                                  class_java_lang_Thread,
 823                                                                  true);
 824 #endif
 825
 826         if (method_thread_init == NULL)
 827                 return false;
 828
 829         /* Get the main-thread (NOTE: The main threads is always the first
 830            thread in the list). */
 831
 832         mainthread = threads_list_first();
 833
 834         /* create a java.lang.Thread for the main thread */
 835
 836         t = (java_lang_Thread *) builtin_new(class_java_lang_Thread);
 837
 838         if (t == NULL)
 839                 return false;
 840
 841         /* set the object in the internal data structure */
 842
 843         mainthread->object = t;
 844
 845 #if defined(ENABLE_INTRP)
 846         /* create interpreter stack */
 847
 848         if (opt_intrp) {
 849                 MSET(intrp_main_stack, 0, u1, opt_stacksize);
 850                 mainthread->_global_sp = (Cell*) (intrp_main_stack + opt_stacksize);
 851         }
 852 #endif
 853
 854         threadname = javastring_new(utf_new_char("main"));
 855
 856 #if defined(ENABLE_JAVASE)
 857         /* allocate and init ThreadGroup */
 858
 859         threadgroup = (java_lang_ThreadGroup *)
 860                 native_new_and_init(class_java_lang_ThreadGroup);
 861
 862         if (threadgroup == NULL)
 863                 return false;
 864 #endif
 865
 866 #if defined(WITH_CLASSPATH_GNU)
 867         /* create a java.lang.VMThread for the main thread */
 868
 869         vmt = (java_lang_VMThread *) builtin_new(class_java_lang_VMThread);
 870
 871         if (vmt == NULL)
 872                 return false;
 873
 874         /* set the thread */
 875
 876         LLNI_field_set_ref(vmt, thread, t);
 877         LLNI_field_set_val(vmt, vmdata, (java_lang_Object *) mainthread);
 878
 879         /* call java.lang.Thread.<init>(Ljava/lang/VMThread;Ljava/lang/String;IZ)V */
 880         o = (java_handle_t *) t;
 881
 882         (void) vm_call_method(method_thread_init, o, vmt, threadname, NORM_PRIORITY,
 883                                                   false);
 884
 885 #elif defined(WITH_CLASSPATH_SUN)
 886
 887         /* We trick java.lang.Thread.init, which sets the priority of the
 888            current thread to the parent's one. */
 889
 890         t->priority = NORM_PRIORITY;
 891
 892 #elif defined(WITH_CLASSPATH_CLDC1_1)
 893
 894         /* set the thread */
 895
 896         t->vm_thread = (java_lang_Object *) mainthread;
 897
 898         /* call public Thread(String name) */
 899
 900         o = (java_handle_t *) t;
 901
 902         (void) vm_call_method(method_thread_init, o, threadname);
 903 #else
 904 # error unknown classpath configuration
 905 #endif
 906
 907         if (exceptions_get_exception())
 908                 return false;
 909
 910 #if defined(ENABLE_JAVASE)
 911         LLNI_field_set_ref(t, group, threadgroup);
 912
 913 # if defined(WITH_CLASSPATH_GNU)
 914         /* add main thread to java.lang.ThreadGroup */
 915
 916         m = class_resolveclassmethod(class_java_lang_ThreadGroup,
 917                                                                  utf_addThread,
 918                                                                  utf_java_lang_Thread__V,
 919                                                                  class_java_lang_ThreadGroup,
 920                                                                  true);
 921
 922         o = (java_handle_t *) threadgroup;
 923
 924         (void) vm_call_method(m, o, t);
 925
 926         if (exceptions_get_exception())
 927                 return false;
 928 # else
 929 #  warning Do not know what to do here
 930 # endif
 931 #endif
 932
 933         threads_set_thread_priority(pthread_self(), NORM_PRIORITY);
 934
 935         /* initialize the thread attribute object */
 936
 937         if (pthread_attr_init(&attr) != 0)
 938                 vm_abort("threads_init: pthread_attr_init failed: %s", strerror(errno));
 939
 940         if (pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) != 0)
 941                 vm_abort("threads_init: pthread_attr_setdetachstate failed: %s",
 942                                  strerror(errno));
 943
 944 #if !defined(NDEBUG)
 945         if (opt_verbosethreads) {
 946                 printf("[Starting thread ");
 947                 threads_thread_print_info(mainthread);
 948                 printf("]\n");
 949         }
 950 #endif
 951
 952         /* everything's ok */
 953
 954         return true;
 955 }
 956
 957
 958 /* threads_startup_thread ******************************************************
 959
 960    Thread startup function called by pthread_create.
 961
 962    Thread which have a startup.function != NULL are marked as internal
 963    threads. All other threads are threated as normal Java threads.
 964
 965    NOTE: This function is not called directly by pthread_create. The Boehm GC
 966          inserts its own GC_start_routine in between, which then calls
 967                  threads_startup.
 968
 969    IN:
 970       arg..........the argument passed to pthread_create, ie. a pointer to
 971                        a startupinfo struct. CAUTION: When the `psem` semaphore
 972                                    is posted, the startupinfo struct becomes invalid! (It
 973                                    is allocated on the stack of threads_start_thread.)
 974
 975 ******************************************************************************/
 976
 977 static void *threads_startup_thread(void *arg)
 978 {
 979         startupinfo        *startup;
 980         threadobject       *thread;
 981 #if defined(WITH_CLASSPATH_GNU)
 982         java_lang_VMThread *vmt;
 983 #endif
 984         sem_t              *psem;
 985         classinfo          *c;
 986         methodinfo         *m;
 987         java_handle_t      *o;
 988         functionptr         function;
 989
 990 #if defined(ENABLE_INTRP)
 991         u1 *intrp_thread_stack;
 992
 993         /* create interpreter stack */
 994
 995         if (opt_intrp) {
 996                 intrp_thread_stack = GCMNEW(u1, opt_stacksize);
 997                 MSET(intrp_thread_stack, 0, u1, opt_stacksize);
 998         }
 999         else
1000                 intrp_thread_stack = NULL;
1001 #endif
1002
1003         /* get passed startupinfo structure and the values in there */
1004
1005         startup = arg;
1006
1007         thread   = startup->thread;
1008         function = startup->function;
1009         psem     = startup->psem;
1010
1011         /* Seems like we've encountered a situation where thread->tid was
1012            not set by pthread_create. We alleviate this problem by waiting
1013            for pthread_create to return. */
1014
1015         threads_sem_wait(startup->psem_first);
1016
1017 #if defined(__DARWIN__)
1018         thread->mach_thread = mach_thread_self();
1019 #endif
1020
1021         /* store the internal thread data-structure in the TSD */
1022
1023         threads_set_current_threadobject(thread);
1024
1025         /* set our priority */
1026
1027         threads_set_thread_priority(thread->tid, LLNI_field_direct(thread->object, priority));
1028
1029         /* thread is completely initialized */
1030
1031         threads_thread_state_runnable(thread);
1032
1033         /* tell threads_startup_thread that we registered ourselves */
1034         /* CAUTION: *startup becomes invalid with this!             */
1035
1036         startup = NULL;
1037         threads_sem_post(psem);
1038
1039 #if defined(ENABLE_INTRP)
1040         /* set interpreter stack */
1041
1042         if (opt_intrp)
1043                 thread->_global_sp = (Cell *) (intrp_thread_stack + opt_stacksize);
1044 #endif
1045
1046 #if defined(ENABLE_JVMTI)
1047         /* fire thread start event */
1048
1049         if (jvmti)
1050                 jvmti_ThreadStartEnd(JVMTI_EVENT_THREAD_START);
1051 #endif
1052
1053 #if !defined(NDEBUG)
1054         if (opt_verbosethreads) {
1055                 printf("[Starting thread ");
1056                 threads_thread_print_info(thread);
1057                 printf("]\n");
1058         }
1059 #endif
1060
1061         /* find and run the Thread.run()V method if no other function was passed */
1062
1063         if (function == NULL) {
1064 #if defined(WITH_CLASSPATH_GNU)
1065                 /* We need to start the run method of
1066                    java.lang.VMThread. Since this is a final class, we can use
1067                    the class object directly. */
1068
1069                 c = class_java_lang_VMThread;
1070 #elif defined(WITH_CLASSPATH_SUN) || defined(WITH_CLASSPATH_CLDC1_1)
1071                 c = thread->object->header.vftbl->class;
1072 #else
1073 # error unknown classpath configuration
1074 #endif
1075
1076                 m = class_resolveclassmethod(c, utf_run, utf_void__void, c, true);
1077
1078                 if (m == NULL)
1079                         vm_abort("threads_startup_thread: run() method not found in class");
1080
1081                 /* set ThreadMXBean variables */
1082
1083                 _Jv_jvm->java_lang_management_ThreadMXBean_ThreadCount++;
1084                 _Jv_jvm->java_lang_management_ThreadMXBean_TotalStartedThreadCount++;
1085
1086                 if (_Jv_jvm->java_lang_management_ThreadMXBean_ThreadCount >
1087                         _Jv_jvm->java_lang_management_ThreadMXBean_PeakThreadCount)
1088                         _Jv_jvm->java_lang_management_ThreadMXBean_PeakThreadCount =
1089                                 _Jv_jvm->java_lang_management_ThreadMXBean_ThreadCount;
1090
1091 #if defined(WITH_CLASSPATH_GNU)
1092                 /* we need to start the run method of java.lang.VMThread */
1093
1094                 vmt = (java_lang_VMThread *) LLNI_field_direct(thread->object, vmThread);
1095                 o   = (java_handle_t *) vmt;
1096
1097 #elif defined(WITH_CLASSPATH_SUN) || defined(WITH_CLASSPATH_CLDC1_1)
1098                 o   = (java_handle_t *) thread->object;
1099 #else
1100 # error unknown classpath configuration
1101 #endif
1102
1103                 /* run the thread */
1104
1105                 (void) vm_call_method(m, o);
1106         }
1107         else {
1108                 /* set ThreadMXBean variables */
1109
1110                 _Jv_jvm->java_lang_management_ThreadMXBean_ThreadCount++;
1111                 _Jv_jvm->java_lang_management_ThreadMXBean_TotalStartedThreadCount++;
1112
1113                 if (_Jv_jvm->java_lang_management_ThreadMXBean_ThreadCount >
1114                         _Jv_jvm->java_lang_management_ThreadMXBean_PeakThreadCount)
1115                         _Jv_jvm->java_lang_management_ThreadMXBean_PeakThreadCount =
1116                                 _Jv_jvm->java_lang_management_ThreadMXBean_ThreadCount;
1117
1118                 /* call passed function, e.g. finalizer_thread */
1119
1120                 (function)();
1121         }
1122
1123 #if !defined(NDEBUG)
1124         if (opt_verbosethreads) {
1125                 printf("[Stopping thread ");
1126                 threads_thread_print_info(thread);
1127                 printf("]\n");
1128         }
1129 #endif
1130
1131 #if defined(ENABLE_JVMTI)
1132         /* fire thread end event */
1133
1134         if (jvmti)
1135                 jvmti_ThreadStartEnd(JVMTI_EVENT_THREAD_END);
1136 #endif
1137
1138         if (!threads_detach_thread(thread))
1139                 vm_abort("threads_startup_thread: threads_detach_thread failed");
1140
1141         /* set ThreadMXBean variables */
1142
1143         _Jv_jvm->java_lang_management_ThreadMXBean_ThreadCount--;
1144
1145         return NULL;
1146 }
1147
1148
1149 /* threads_impl_thread_start ***************************************************
1150
1151    Start a thread in the JVM.  Both (vm internal and java) thread
1152    objects exist.
1153
1154    IN:
1155       thread....the thread object
1156           f.........function to run in the new thread. NULL means that the
1157                     "run" method of the object `t` should be called
1158
1159 ******************************************************************************/
1160
1161 void threads_impl_thread_start(threadobject *thread, functionptr f)
1162 {
1163         sem_t          sem;
1164         sem_t          sem_first;
1165         pthread_attr_t attr;
1166         startupinfo    startup;
1167         int            ret;
1168
1169         /* fill startupinfo structure passed by pthread_create to
1170          * threads_startup_thread */
1171
1172         startup.thread     = thread;
1173         startup.function   = f;              /* maybe we don't call Thread.run()V */
1174         startup.psem       = &sem;
1175         startup.psem_first = &sem_first;
1176
1177         threads_sem_init(&sem, 0, 0);
1178         threads_sem_init(&sem_first, 0, 0);
1179
1180         /* initialize thread attributes */
1181
1182         if (pthread_attr_init(&attr) != 0)
1183                 vm_abort("threads_impl_thread_start: pthread_attr_init failed: %s",
1184                                  strerror(errno));
1185
1186     if (pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) != 0)
1187                 vm_abort("threads_impl_thread_start: pthread_attr_setdetachstate failed: %s",
1188                                  strerror(errno));
1189
1190         /* initialize thread stacksize */
1191
1192         if (pthread_attr_setstacksize(&attr, opt_stacksize))
1193                 vm_abort("threads_impl_thread_start: pthread_attr_setstacksize failed: %s",
1194                                  strerror(errno));
1195
1196         /* create the thread */
1197
1198         ret = pthread_create(&(thread->tid), &attr, threads_startup_thread, &startup);
1199
1200         /* destroy the thread attributes */
1201
1202         if (pthread_attr_destroy(&attr) != 0)
1203                 vm_abort("threads_impl_thread_start: pthread_attr_destroy failed: %s",
1204                                  strerror(errno));
1205
1206         /* check for pthread_create error */
1207
1208         if (ret != 0)
1209                 vm_abort("threads_impl_thread_start: pthread_create failed: %s",
1210                                  strerror(errno));
1211
1212         /* signal that pthread_create has returned, so thread->tid is valid */
1213
1214         threads_sem_post(&sem_first);
1215
1216         /* wait here until the thread has entered itself into the thread list */
1217
1218         threads_sem_wait(&sem);
1219
1220         /* cleanup */
1221
1222         sem_destroy(&sem);
1223         sem_destroy(&sem_first);
1224 }
1225
1226
1227 /* threads_set_thread_priority *************************************************
1228
1229    Set the priority of the given thread.
1230
1231    IN:
1232       tid..........thread id
1233           priority.....priority to set
1234
1235 ******************************************************************************/
1236
1237 void threads_set_thread_priority(pthread_t tid, int priority)
1238 {
1239         struct sched_param schedp;
1240         int policy;
1241
1242         pthread_getschedparam(tid, &policy, &schedp);
1243         schedp.sched_priority = priority;
1244         pthread_setschedparam(tid, policy, &schedp);
1245 }
1246
1247
1248 /* threads_attach_current_thread ***********************************************
1249
1250    Attaches the current thread to the VM.  Used in JNI.
1251
1252 *******************************************************************************/
1253
1254 bool threads_attach_current_thread(JavaVMAttachArgs *vm_aargs, bool isdaemon)
1255 {
1256         threadobject          *thread;
1257         utf                   *u;
1258         java_handle_t         *s;
1259         java_handle_t         *o;
1260         java_lang_Thread      *t;
1261
1262 #if defined(ENABLE_JAVASE)
1263         java_lang_ThreadGroup *group;
1264         threadobject          *mainthread;
1265         classinfo             *c;
1266         methodinfo            *m;
1267 #endif
1268
1269 #if defined(WITH_CLASSPATH_GNU)
1270         java_lang_VMThread    *vmt;
1271 #endif
1272
1273         /* Enter the join-mutex, so if the main-thread is currently
1274            waiting to join all threads, the number of non-daemon threads
1275            is correct. */
1276
1277         threads_mutex_join_lock();
1278
1279         /* create internal thread data-structure */
1280
1281         thread = threads_thread_new();
1282
1283         /* thread is a Java thread and running */
1284
1285         thread->flags = THREAD_FLAG_JAVA;
1286
1287         if (isdaemon)
1288                 thread->flags |= THREAD_FLAG_DAEMON;
1289
1290         /* The thread is flagged and (non-)daemon thread, we can leave the
1291            mutex. */
1292
1293         threads_mutex_join_unlock();
1294
1295         /* create a java.lang.Thread object */
1296
1297         t = (java_lang_Thread *) builtin_new(class_java_lang_Thread);
1298
1299         /* XXX memory leak!!! */
1300         if (t == NULL)
1301                 return false;
1302
1303         thread->object = t;
1304
1305         /* thread is completely initialized */
1306
1307         threads_thread_state_runnable(thread);
1308
1309 #if !defined(NDEBUG)
1310         if (opt_verbosethreads) {
1311                 printf("[Attaching thread ");
1312                 threads_thread_print_info(thread);
1313                 printf("]\n");
1314         }
1315 #endif
1316
1317 #if defined(ENABLE_INTRP)
1318         /* create interpreter stack */
1319
1320         if (opt_intrp) {
1321                 MSET(intrp_main_stack, 0, u1, opt_stacksize);
1322                 thread->_global_sp = (Cell *) (intrp_main_stack + opt_stacksize);
1323         }
1324 #endif
1325
1326 #if defined(WITH_CLASSPATH_GNU)
1327
1328         /* create a java.lang.VMThread object */
1329
1330         vmt = (java_lang_VMThread *) builtin_new(class_java_lang_VMThread);
1331
1332         /* XXX memory leak!!! */
1333         if (vmt == NULL)
1334                 return false;
1335
1336         /* set the thread */
1337
1338         LLNI_field_set_ref(vmt, thread, t);
1339         LLNI_field_set_val(vmt, vmdata, (java_lang_Object *) thread);
1340
1341 #elif defined(WITH_CLASSPATH_SUN)
1342
1343         vm_abort("threads_attach_current_thread: IMPLEMENT ME!");
1344
1345 #elif defined(WITH_CLASSPATH_CLDC1_1)
1346
1347         LLNI_field_set_val(t, vm_thread, (java_lang_Object *) thread);
1348
1349 #else
1350 # error unknown classpath configuration
1351 #endif
1352
1353         if (vm_aargs != NULL) {
1354                 u     = utf_new_char(vm_aargs->name);
1355 #if defined(ENABLE_JAVASE)
1356                 group = (java_lang_ThreadGroup *) vm_aargs->group;
1357 #endif
1358         }
1359         else {
1360                 u     = utf_null;
1361 #if defined(ENABLE_JAVASE)
1362                 /* get the main thread */
1363
1364                 mainthread = threads_list_first();
1365                 group = LLNI_field_direct(mainthread->object, group);
1366 #endif
1367         }
1368
1369         /* the the thread name */
1370
1371         s = javastring_new(u);
1372
1373         /* for convenience */
1374
1375         o = (java_handle_t *) thread->object;
1376
1377 #if defined(WITH_CLASSPATH_GNU)
1378         (void) vm_call_method(method_thread_init, o, vmt, s, NORM_PRIORITY,
1379                                                   isdaemon);
1380 #elif defined(WITH_CLASSPATH_CLDC1_1)
1381         (void) vm_call_method(method_thread_init, o, s);
1382 #endif
1383
1384         if (exceptions_get_exception())
1385                 return false;
1386
1387 #if defined(ENABLE_JAVASE)
1388         /* store the thread group in the object */
1389
1390         LLNI_field_direct(thread->object, group) = group;
1391
1392         /* add thread to given thread-group */
1393
1394         LLNI_class_get(group, c);
1395
1396         m = class_resolveclassmethod(c,
1397                                                                  utf_addThread,
1398                                                                  utf_java_lang_Thread__V,
1399                                                                  class_java_lang_ThreadGroup,
1400                                                                  true);
1401
1402         o = (java_handle_t *) group;
1403
1404         (void) vm_call_method(m, o, t);
1405
1406         if (exceptions_get_exception())
1407                 return false;
1408 #endif
1409
1410         return true;
1411 }
1412
1413
1414 /* threads_detach_thread *******************************************************
1415
1416    Detaches the passed thread from the VM.  Used in JNI.
1417
1418 *******************************************************************************/
1419
1420 bool threads_detach_thread(threadobject *thread)
1421 {
1422 #if defined(ENABLE_JAVASE)
1423         java_lang_ThreadGroup *group;
1424         classinfo             *c;
1425         methodinfo            *m;
1426         java_handle_t         *o;
1427         java_lang_Thread      *t;
1428 #endif
1429
1430         /* XXX implement uncaught exception stuff (like JamVM does) */
1431
1432 #if defined(ENABLE_JAVASE)
1433         /* remove thread from the thread group */
1434
1435         group = LLNI_field_direct(thread->object, group);
1436
1437         /* XXX TWISTI: should all threads be in a ThreadGroup? */
1438
1439         if (group != NULL) {
1440                 LLNI_class_get(group, c);
1441
1442 # if defined(WITH_CLASSPATH_GNU)
1443                 m = class_resolveclassmethod(c,
1444                                                                          utf_removeThread,
1445                                                                          utf_java_lang_Thread__V,
1446                                                                          class_java_lang_ThreadGroup,
1447                                                                          true);
1448 # elif defined(WITH_CLASSPATH_SUN)
1449                 m = class_resolveclassmethod(c,
1450                                                                          utf_remove,
1451                                                                          utf_java_lang_Thread__V,
1452                                                                          class_java_lang_ThreadGroup,
1453                                                                          true);
1454 # else
1455 #  error unknown classpath configuration
1456 # endif
1457
1458                 if (m == NULL)
1459                         return false;
1460
1461                 o = (java_handle_t *) group;
1462                 t = thread->object;
1463
1464                 (void) vm_call_method(m, o, t);
1465
1466                 if (exceptions_get_exception())
1467                         return false;
1468         }
1469 #endif
1470
1471         /* thread is terminated */
1472
1473         threads_thread_state_terminated(thread);
1474
1475 #if !defined(NDEBUG)
1476         if (opt_verbosethreads) {
1477                 printf("[Detaching thread ");
1478                 threads_thread_print_info(thread);
1479                 printf("]\n");
1480         }
1481 #endif
1482
1483         /* Enter the join-mutex before calling threads_thread_free, so
1484            threads_join_all_threads gets the correct number of non-daemon
1485            threads. */
1486
1487         threads_mutex_join_lock();
1488
1489         /* free the vm internal thread object */
1490
1491         threads_thread_free(thread);
1492
1493         /* Signal that this thread has finished and leave the mutex. */
1494
1495         pthread_cond_signal(&cond_join);
1496         threads_mutex_join_unlock();
1497
1498         return true;
1499 }
1500
1501
1502 /* threads_join_all_threads ****************************************************
1503
1504    Join all non-daemon threads.
1505
1506 *******************************************************************************/
1507
1508 void threads_join_all_threads(void)
1509 {
1510         threadobject *t;
1511
1512         /* get current thread */
1513
1514         t = THREADOBJECT;
1515
1516         /* this thread is waiting for all non-daemon threads to exit */
1517
1518         threads_thread_state_waiting(t);
1519
1520         /* enter join mutex */
1521
1522         threads_mutex_join_lock();
1523
1524         /* Wait for condition as long as we have non-daemon threads.  We
1525            compare against 1 because the current (main thread) is also a
1526            non-daemon thread. */
1527
1528         while (threads_list_get_non_daemons() > 1)
1529                 pthread_cond_wait(&cond_join, &mutex_join);
1530
1531         /* leave join mutex */
1532
1533         threads_mutex_join_unlock();
1534 }
1535
1536
1537 /* threads_timespec_earlier ****************************************************
1538
1539    Return true if timespec tv1 is earlier than timespec tv2.
1540
1541    IN:
1542       tv1..........first timespec
1543           tv2..........second timespec
1544
1545    RETURN VALUE:
1546       true, if the first timespec is earlier
1547
1548 *******************************************************************************/
1549
1550 static inline bool threads_timespec_earlier(const struct timespec *tv1,
1551                                                                                         const struct timespec *tv2)
1552 {
1553         return (tv1->tv_sec < tv2->tv_sec)
1554                                 ||
1555                 (tv1->tv_sec == tv2->tv_sec && tv1->tv_nsec < tv2->tv_nsec);
1556 }
1557
1558
1559 /* threads_current_time_is_earlier_than ****************************************
1560
1561    Check if the current time is earlier than the given timespec.
1562
1563    IN:
1564       tv...........the timespec to compare against
1565
1566    RETURN VALUE:
1567       true, if the current time is earlier
1568
1569 *******************************************************************************/
1570
1571 static bool threads_current_time_is_earlier_than(const struct timespec *tv)
1572 {
1573         struct timeval tvnow;
1574         struct timespec tsnow;
1575
1576         /* get current time */
1577
1578         if (gettimeofday(&tvnow, NULL) != 0)
1579                 vm_abort("gettimeofday failed: %s\n", strerror(errno));
1580
1581         /* convert it to a timespec */
1582
1583         tsnow.tv_sec = tvnow.tv_sec;
1584         tsnow.tv_nsec = tvnow.tv_usec * 1000;
1585
1586         /* compare current time with the given timespec */
1587
1588         return threads_timespec_earlier(&tsnow, tv);
1589 }
1590
1591
1592 /* threads_wait_with_timeout ***************************************************
1593
1594    Wait until the given point in time on a monitor until either
1595    we are notified, we are interrupted, or the time is up.
1596
1597    IN:
1598       t............the current thread
1599           wakeupTime...absolute (latest) wakeup time
1600                            If both tv_sec and tv_nsec are zero, this function
1601                                            waits for an unlimited amount of time.
1602
1603    RETURN VALUE:
1604       true.........if the wait has been interrupted,
1605           false........if the wait was ended by notification or timeout
1606
1607 *******************************************************************************/
1608
1609 static bool threads_wait_with_timeout(threadobject *thread,
1610                                                                           struct timespec *wakeupTime)
1611 {
1612         bool wasinterrupted;
1613
1614         /* acquire the waitmutex */
1615
1616         pthread_mutex_lock(&thread->waitmutex);
1617
1618         /* mark us as sleeping */
1619
1620         thread->sleeping = true;
1621
1622         /* wait on waitcond */
1623
1624         if (wakeupTime->tv_sec || wakeupTime->tv_nsec) {
1625                 /* with timeout */
1626                 while (!thread->interrupted && !thread->signaled
1627                            && threads_current_time_is_earlier_than(wakeupTime))
1628                 {
1629                         threads_thread_state_timed_waiting(thread);
1630
1631                         pthread_cond_timedwait(&thread->waitcond, &thread->waitmutex,
1632                                                                    wakeupTime);
1633
1634                         threads_thread_state_runnable(thread);
1635                 }
1636         }
1637         else {
1638                 /* no timeout */
1639                 while (!thread->interrupted && !thread->signaled) {
1640                         threads_thread_state_waiting(thread);
1641
1642                         pthread_cond_wait(&thread->waitcond, &thread->waitmutex);
1643
1644                         threads_thread_state_runnable(thread);
1645                 }
1646         }
1647
1648         /* check if we were interrupted */
1649
1650         wasinterrupted = thread->interrupted;
1651
1652         /* reset all flags */
1653
1654         thread->interrupted = false;
1655         thread->signaled    = false;
1656         thread->sleeping    = false;
1657
1658         /* release the waitmutex */
1659
1660         pthread_mutex_unlock(&thread->waitmutex);
1661
1662         return wasinterrupted;
1663 }
1664
1665
1666 /* threads_wait_with_timeout_relative ******************************************
1667
1668    Wait for the given maximum amount of time on a monitor until either
1669    we are notified, we are interrupted, or the time is up.
1670
1671    IN:
1672       t............the current thread
1673           millis.......milliseconds to wait
1674           nanos........nanoseconds to wait
1675
1676    RETURN VALUE:
1677       true.........if the wait has been interrupted,
1678           false........if the wait was ended by notification or timeout
1679
1680 *******************************************************************************/
1681
1682 bool threads_wait_with_timeout_relative(threadobject *thread, s8 millis,
1683                                                                                 s4 nanos)
1684 {
1685         struct timespec wakeupTime;
1686
1687         /* calculate the the (latest) wakeup time */
1688
1689         threads_calc_absolute_time(&wakeupTime, millis, nanos);
1690
1691         /* wait */
1692
1693         return threads_wait_with_timeout(thread, &wakeupTime);
1694 }
1695
1696
1697 /* threads_calc_absolute_time **************************************************
1698
1699    Calculate the absolute point in time a given number of ms and ns from now.
1700
1701    IN:
1702       millis............milliseconds from now
1703           nanos.............nanoseconds from now
1704
1705    OUT:
1706       *tm...............receives the timespec of the absolute point in time
1707
1708 *******************************************************************************/
1709
1710 static void threads_calc_absolute_time(struct timespec *tm, s8 millis, s4 nanos)
1711 {
1712         if ((millis != 0x7fffffffffffffffLLU) && (millis || nanos)) {
1713                 struct timeval tv;
1714                 long nsec;
1715                 gettimeofday(&tv, NULL);
1716                 tv.tv_sec += millis / 1000;
1717                 millis %= 1000;
1718                 nsec = tv.tv_usec * 1000 + (s4) millis * 1000000 + nanos;
1719                 tm->tv_sec = tv.tv_sec + nsec / 1000000000;
1720                 tm->tv_nsec = nsec % 1000000000;
1721         }
1722         else {
1723                 tm->tv_sec = 0;
1724                 tm->tv_nsec = 0;
1725         }
1726 }
1727
1728
1729 /* threads_thread_interrupt ****************************************************
1730
1731    Interrupt the given thread.
1732
1733    The thread gets the "waitcond" signal and
1734    its interrupted flag is set to true.
1735
1736    IN:
1737       thread............the thread to interrupt
1738
1739 *******************************************************************************/
1740
1741 void threads_thread_interrupt(threadobject *thread)
1742 {
1743         /* Signal the thread a "waitcond" and tell it that it has been
1744            interrupted. */
1745
1746         pthread_mutex_lock(&thread->waitmutex);
1747
1748         /* Interrupt blocking system call using a signal. */
1749
1750         pthread_kill(thread->tid, SIGHUP);
1751
1752         if (thread->sleeping)
1753                 pthread_cond_signal(&thread->waitcond);
1754
1755         thread->interrupted = true;
1756
1757         pthread_mutex_unlock(&thread->waitmutex);
1758 }
1759
1760
1761 /* threads_check_if_interrupted_and_reset **************************************
1762
1763    Check if the current thread has been interrupted and reset the
1764    interruption flag.
1765
1766    RETURN VALUE:
1767       true, if the current thread had been interrupted
1768
1769 *******************************************************************************/
1770
1771 bool threads_check_if_interrupted_and_reset(void)
1772 {
1773         threadobject *thread;
1774         bool intr;
1775
1776         thread = THREADOBJECT;
1777
1778         /* get interrupted flag */
1779
1780         intr = thread->interrupted;
1781
1782         /* reset interrupted flag */
1783
1784         thread->interrupted = false;
1785
1786         return intr;
1787 }
1788
1789
1790 /* threads_thread_has_been_interrupted *****************************************
1791
1792    Check if the given thread has been interrupted
1793
1794    IN:
1795       t............the thread to check
1796
1797    RETURN VALUE:
1798       true, if the given thread had been interrupted
1799
1800 *******************************************************************************/
1801
1802 bool threads_thread_has_been_interrupted(threadobject *thread)
1803 {
1804         return thread->interrupted;
1805 }
1806
1807
1808 /* threads_sleep ***************************************************************
1809
1810    Sleep the current thread for the specified amount of time.
1811
1812 *******************************************************************************/
1813
1814 void threads_sleep(s8 millis, s4 nanos)
1815 {
1816         threadobject    *thread;
1817         struct timespec  wakeupTime;
1818         bool             wasinterrupted;
1819
1820         thread = THREADOBJECT;
1821
1822         threads_calc_absolute_time(&wakeupTime, millis, nanos);
1823
1824         wasinterrupted = threads_wait_with_timeout(thread, &wakeupTime);
1825
1826         if (wasinterrupted)
1827                 exceptions_throw_interruptedexception();
1828 }
1829
1830
1831 /* threads_yield ***************************************************************
1832
1833    Yield to the scheduler.
1834
1835 *******************************************************************************/
1836
1837 void threads_yield(void)
1838 {
1839         sched_yield();
1840 }
1841
1842
1843 /*
1844  * These are local overrides for various environment variables in Emacs.
1845  * Please do not remove this and leave it at the end of the file, where
1846  * Emacs will automagically detect them.
1847  * ---------------------------------------------------------------------
1848  * Local variables:
1849  * mode: c
1850  * indent-tabs-mode: t
1851  * c-basic-offset: 4
1852  * tab-width: 4
1853  * End:
1854  * vim:noexpandtab:sw=4:ts=4:
1855  */