src/threads/native/threads.c

   1 /* src/threads/native/threads.c - native threads support
   2
   3    Copyright (C) 1996-2005, 2006 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    Contact: cacao@cacaojvm.org
  26
  27    Authors: Stefan Ring
  28
  29    Changes: Christian Thalinger
  30                         Edwin Steiner
  31
  32    $Id: threads.c 4938 2006-05-22 09:06:44Z twisti $
  33
  34 */
  35
  36
  37 #include "config.h"
  38
  39 /* XXX cleanup these includes */
  40
  41 #include <stdlib.h>
  42 #include <string.h>
  43 #include <assert.h>
  44 #include <sys/types.h>
  45 #include <unistd.h>
  46 #include <signal.h>
  47 #include <sys/time.h>
  48 #include <time.h>
  49 #include <errno.h>
  50
  51 #include <pthread.h>
  52
  53 #include "vm/types.h"
  54
  55 #include "arch.h"
  56
  57 #if !defined(USE_FAKE_ATOMIC_INSTRUCTIONS)
  58 # include "machine-instr.h"
  59 #else
  60 # include "threads/native/generic-primitives.h"
  61 #endif
  62
  63 #include "mm/boehm.h"
  64 #include "mm/memory.h"
  65 #include "native/native.h"
  66 #include "native/include/java_lang_Object.h"
  67 #include "native/include/java_lang_Throwable.h"
  68 #include "native/include/java_lang_Thread.h"
  69 #include "native/include/java_lang_ThreadGroup.h"
  70 #include "native/include/java_lang_VMThread.h"
  71 #include "threads/native/threads.h"
  72 #include "toolbox/avl.h"
  73 #include "toolbox/logging.h"
  74 #include "vm/builtin.h"
  75 #include "vm/exceptions.h"
  76 #include "vm/global.h"
  77 #include "vm/loader.h"
  78 #include "vm/options.h"
  79 #include "vm/stringlocal.h"
  80 #include "vm/vm.h"
  81 #include "vm/jit/asmpart.h"
  82
  83 #if !defined(__DARWIN__)
  84 # if defined(__LINUX__)
  85 #  define GC_LINUX_THREADS
  86 # elif defined(__MIPS__)
  87 #  define GC_IRIX_THREADS
  88 # endif
  89 # include <semaphore.h>
  90 # include "boehm-gc/include/gc.h"
  91 #endif
  92
  93
  94 #if defined(__DARWIN__)
  95 /* Darwin has no working semaphore implementation.  This one is taken
  96    from Boehm-GC. */
  97
  98 /*
  99    This is a very simple semaphore implementation for darwin. It
 100    is implemented in terms of pthreads calls so it isn't async signal
 101    safe. This isn't a problem because signals aren't used to
 102    suspend threads on darwin.
 103 */
 104
 105 static int sem_init(sem_t *sem, int pshared, int value)
 106 {
 107         if (pshared)
 108                 assert(0);
 109
 110         sem->value = value;
 111
 112         if (pthread_mutex_init(&sem->mutex, NULL) < 0)
 113                 return -1;
 114
 115         if (pthread_cond_init(&sem->cond, NULL) < 0)
 116                 return -1;
 117
 118         return 0;
 119 }
 120
 121 static int sem_post(sem_t *sem)
 122 {
 123         if (pthread_mutex_lock(&sem->mutex) < 0)
 124                 return -1;
 125
 126         sem->value++;
 127
 128         if (pthread_cond_signal(&sem->cond) < 0) {
 129                 pthread_mutex_unlock(&sem->mutex);
 130                 return -1;
 131         }
 132
 133         if (pthread_mutex_unlock(&sem->mutex) < 0)
 134                 return -1;
 135
 136         return 0;
 137 }
 138
 139 static int sem_wait(sem_t *sem)
 140 {
 141         if (pthread_mutex_lock(&sem->mutex) < 0)
 142                 return -1;
 143
 144         while (sem->value == 0) {
 145                 pthread_cond_wait(&sem->cond, &sem->mutex);
 146         }
 147
 148         sem->value--;
 149
 150         if (pthread_mutex_unlock(&sem->mutex) < 0)
 151                 return -1;
 152
 153         return 0;
 154 }
 155
 156 static int sem_destroy(sem_t *sem)
 157 {
 158         if (pthread_cond_destroy(&sem->cond) < 0)
 159                 return -1;
 160
 161         if (pthread_mutex_destroy(&sem->mutex) < 0)
 162                 return -1;
 163
 164         return 0;
 165 }
 166 #endif /* defined(__DARWIN__) */
 167
 168
 169 /* internally used constants **************************************************/
 170
 171 /* CAUTION: Do not change these values. Boehm GC code depends on them.        */
 172 #define STOPWORLD_FROM_GC               1
 173 #define STOPWORLD_FROM_CLASS_NUMBERING  2
 174
 175 #define THREADS_INITIAL_TABLE_SIZE      8
 176
 177
 178 /* startupinfo *****************************************************************
 179
 180    Struct used to pass info from threads_start_thread to
 181    threads_startup_thread.
 182
 183 ******************************************************************************/
 184
 185 typedef struct {
 186         threadobject *thread;      /* threadobject for this thread             */
 187         functionptr   function;    /* function to run in the new thread        */
 188         sem_t        *psem;        /* signals when thread has been entered     */
 189                                    /* in the thread list                       */
 190         sem_t        *psem_first;  /* signals when pthread_create has returned */
 191 } startupinfo;
 192
 193
 194 /* prototypes *****************************************************************/
 195
 196 static void threads_table_init(void);
 197 static s4 threads_table_add(threadobject *thread);
 198 static void threads_table_remove(threadobject *thread);
 199 static void threads_calc_absolute_time(struct timespec *tm, s8 millis, s4 nanos);
 200
 201 #if !defined(NDEBUG)
 202 static void threads_table_dump(FILE *file);
 203 #endif
 204
 205 /******************************************************************************/
 206 /* GLOBAL VARIABLES                                                           */
 207 /******************************************************************************/
 208
 209 /* the main thread                                                            */
 210 threadobject *mainthreadobj;
 211
 212 /* the thread object of the current thread                                    */
 213 /* This is either a thread-local variable defined with __thread, or           */
 214 /* a thread-specific value stored with key threads_current_threadobject_key.  */
 215 #if defined(HAVE___THREAD)
 216 __thread threadobject *threads_current_threadobject;
 217 #else
 218 pthread_key_t threads_current_threadobject_key;
 219 #endif
 220
 221 /* global threads table                                                       */
 222 static threads_table_t threads_table;
 223
 224 /* global compiler mutex                                                      */
 225 static pthread_mutex_rec_t compiler_mutex;
 226
 227 /* global mutex for changing the thread list                                  */
 228 static pthread_mutex_t threadlistlock;
 229
 230 /* global mutex for stop-the-world                                            */
 231 static pthread_mutex_t stopworldlock;
 232
 233 /* this is one of the STOPWORLD_FROM_ constants, telling why the world is     */
 234 /* being stopped                                                              */
 235 static volatile int stopworldwhere;
 236
 237 /* semaphore used for acknowleding thread suspension                          */
 238 static sem_t suspend_ack;
 239 #if defined(__MIPS__)
 240 static pthread_mutex_t suspend_ack_lock = PTHREAD_MUTEX_INITIALIZER;
 241 static pthread_cond_t suspend_cond = PTHREAD_COND_INITIALIZER;
 242 #endif
 243
 244 static pthread_attr_t threadattr;
 245
 246 /* mutexes used by the fake atomic instructions                               */
 247 #if defined(USE_FAKE_ATOMIC_INSTRUCTIONS)
 248 pthread_mutex_t _atomic_add_lock = PTHREAD_MUTEX_INITIALIZER;
 249 pthread_mutex_t _cas_lock = PTHREAD_MUTEX_INITIALIZER;
 250 pthread_mutex_t _mb_lock = PTHREAD_MUTEX_INITIALIZER;
 251 #endif
 252
 253
 254 /******************************************************************************/
 255 /* Recursive Mutex Implementation for Darwin                                  */
 256 /******************************************************************************/
 257
 258 #if defined(MUTEXSIM)
 259
 260 /* We need this for older MacOSX (10.1.x) */
 261
 262 void pthread_mutex_init_rec(pthread_mutex_rec_t *m)
 263 {
 264         pthread_mutex_init(&m->mutex, NULL);
 265         m->count = 0;
 266 }
 267
 268 void pthread_mutex_destroy_rec(pthread_mutex_rec_t *m)
 269 {
 270         pthread_mutex_destroy(&m->mutex);
 271 }
 272
 273 void pthread_mutex_lock_rec(pthread_mutex_rec_t *m)
 274 {
 275         for (;;) {
 276                 if (!m->count)
 277                 {
 278                         pthread_mutex_lock(&m->mutex);
 279                         m->owner = pthread_self();
 280                         m->count++;
 281                         break;
 282                 }
 283                 else {
 284                         if (m->owner != pthread_self()) {
 285                                 pthread_mutex_lock(&m->mutex);
 286                         }
 287                         else {
 288                                 m->count++;
 289                                 break;
 290                         }
 291                 }
 292         }
 293 }
 294
 295 void pthread_mutex_unlock_rec(pthread_mutex_rec_t *m)
 296 {
 297         if (!--m->count)
 298                 pthread_mutex_unlock(&m->mutex);
 299 }
 300
 301 #endif /* defined(MUTEXSIM) */
 302
 303
 304 /* threads_sem_init ************************************************************
 305
 306    Initialize a semaphore. Checks against errors and interruptions.
 307
 308    IN:
 309        sem..............the semaphore to initialize
 310            shared...........true if this semaphore will be shared between processes
 311            value............the initial value for the semaphore
 312
 313 *******************************************************************************/
 314
 315 void threads_sem_init(sem_t *sem, bool shared, int value)
 316 {
 317         int r;
 318
 319         assert(sem);
 320
 321         do {
 322                 r = sem_init(sem, shared, value);
 323                 if (r == 0)
 324                         return;
 325         } while (errno == EINTR);
 326
 327         vm_abort("sem_init failed: %s", strerror(errno));
 328 }
 329
 330
 331 /* threads_sem_wait ************************************************************
 332
 333    Wait for a semaphore, non-interruptible.
 334
 335    IMPORTANT: Always use this function instead of `sem_wait` directly, as
 336               `sem_wait` may be interrupted by signals!
 337
 338    IN:
 339        sem..............the semaphore to wait on
 340
 341 *******************************************************************************/
 342
 343 void threads_sem_wait(sem_t *sem)
 344 {
 345         int r;
 346
 347         assert(sem);
 348
 349         do {
 350                 r = sem_wait(sem);
 351                 if (r == 0)
 352                         return;
 353         } while (errno == EINTR);
 354
 355         vm_abort("sem_wait failed: %s", strerror(errno));
 356 }
 357
 358
 359 /* threads_sem_post ************************************************************
 360
 361    Increase the count of a semaphore. Checks for errors.
 362
 363    IN:
 364        sem..............the semaphore to increase the count of
 365
 366 *******************************************************************************/
 367
 368 void threads_sem_post(sem_t *sem)
 369 {
 370         int r;
 371
 372         assert(sem);
 373
 374         /* unlike sem_wait, sem_post is not interruptible */
 375
 376         r = sem_post(sem);
 377         if (r == 0)
 378                 return;
 379
 380         vm_abort("sem_post failed: %s", strerror(errno));
 381 }
 382
 383
 384 /* threads_set_thread_priority *************************************************
 385
 386    Set the priority of the given thread.
 387
 388    IN:
 389       tid..........thread id
 390           priority.....priority to set
 391
 392 ******************************************************************************/
 393
 394 static void threads_set_thread_priority(pthread_t tid, int priority)
 395 {
 396         struct sched_param schedp;
 397         int policy;
 398
 399         pthread_getschedparam(tid, &policy, &schedp);
 400         schedp.sched_priority = priority;
 401         pthread_setschedparam(tid, policy, &schedp);
 402 }
 403
 404
 405 /* compiler_lock ***************************************************************
 406
 407    Enter the compiler lock.
 408
 409 ******************************************************************************/
 410
 411 void compiler_lock(void)
 412 {
 413         pthread_mutex_lock_rec(&compiler_mutex);
 414 }
 415
 416
 417 /* compiler_unlock *************************************************************
 418
 419    Release the compiler lock.
 420
 421 ******************************************************************************/
 422
 423 void compiler_unlock(void)
 424 {
 425         pthread_mutex_unlock_rec(&compiler_mutex);
 426 }
 427
 428
 429 /* lock_stopworld **************************************************************
 430
 431    Enter the stopworld lock, specifying why the world shall be stopped.
 432
 433    IN:
 434       where........ STOPWORLD_FROM_GC              (1) from within GC
 435                     STOPWORLD_FROM_CLASS_NUMBERING (2) class numbering
 436
 437 ******************************************************************************/
 438
 439 void lock_stopworld(int where)
 440 {
 441         pthread_mutex_lock(&stopworldlock);
 442         stopworldwhere = where;
 443 }
 444
 445
 446 /* unlock_stopworld ************************************************************
 447
 448    Release the stopworld lock.
 449
 450 ******************************************************************************/
 451
 452 void unlock_stopworld(void)
 453 {
 454         stopworldwhere = 0;
 455         pthread_mutex_unlock(&stopworldlock);
 456 }
 457
 458 #if !defined(__DARWIN__)
 459 /* Caller must hold threadlistlock */
 460 static int threads_cast_sendsignals(int sig, int count)
 461 {
 462         /* Count threads */
 463         threadobject *tobj = mainthreadobj;
 464         threadobject *self = THREADOBJECT;
 465
 466         if (count == 0) {
 467                 do {
 468                         count++;
 469                         tobj = tobj->next;
 470                 } while (tobj != mainthreadobj);
 471         }
 472
 473         assert(tobj == mainthreadobj);
 474
 475         do {
 476                 if (tobj != self)
 477                         pthread_kill(tobj->tid, sig);
 478                 tobj = tobj->next;
 479         } while (tobj != mainthreadobj);
 480
 481         return count - 1;
 482 }
 483
 484 #else
 485
 486 static void threads_cast_darwinstop(void)
 487 {
 488         threadobject *tobj = mainthreadobj;
 489         threadobject *self = THREADOBJECT;
 490
 491         do {
 492                 if (tobj != self)
 493                 {
 494                         thread_state_flavor_t flavor = PPC_THREAD_STATE;
 495                         mach_msg_type_number_t thread_state_count = PPC_THREAD_STATE_COUNT;
 496                         ppc_thread_state_t thread_state;
 497                         mach_port_t thread = tobj->mach_thread;
 498                         kern_return_t r;
 499
 500                         r = thread_suspend(thread);
 501                         if (r != KERN_SUCCESS) {
 502                                 log_text("thread_suspend failed");
 503                                 assert(0);
 504                         }
 505
 506                         r = thread_get_state(thread, flavor,
 507                                 (natural_t*)&thread_state, &thread_state_count);
 508                         if (r != KERN_SUCCESS) {
 509                                 log_text("thread_get_state failed");
 510                                 assert(0);
 511                         }
 512
 513                         thread_restartcriticalsection(&thread_state);
 514
 515                         r = thread_set_state(thread, flavor,
 516                                 (natural_t*)&thread_state, thread_state_count);
 517                         if (r != KERN_SUCCESS) {
 518                                 log_text("thread_set_state failed");
 519                                 assert(0);
 520                         }
 521                 }
 522                 tobj = tobj->next;
 523         } while (tobj != mainthreadobj);
 524 }
 525
 526 static void threads_cast_darwinresume(void)
 527 {
 528         threadobject *tobj = mainthreadobj;
 529         threadobject *self = THREADOBJECT;
 530
 531         do {
 532                 if (tobj != self)
 533                 {
 534                         mach_port_t thread = tobj->mach_thread;
 535                         kern_return_t r;
 536
 537                         r = thread_resume(thread);
 538                         if (r != KERN_SUCCESS) {
 539                                 log_text("thread_resume failed");
 540                                 assert(0);
 541                         }
 542                 }
 543                 tobj = tobj->next;
 544         } while (tobj != mainthreadobj);
 545 }
 546
 547 #endif
 548
 549 #if defined(__MIPS__)
 550 static void threads_cast_irixresume(void)
 551 {
 552         pthread_mutex_lock(&suspend_ack_lock);
 553         pthread_cond_broadcast(&suspend_cond);
 554         pthread_mutex_unlock(&suspend_ack_lock);
 555 }
 556 #endif
 557
 558 void threads_cast_stopworld(void)
 559 {
 560         int count, i;
 561         lock_stopworld(STOPWORLD_FROM_CLASS_NUMBERING);
 562         pthread_mutex_lock(&threadlistlock);
 563 #if defined(__DARWIN__)
 564         threads_cast_darwinstop();
 565 #else
 566         count = threads_cast_sendsignals(GC_signum1(), 0);
 567         for (i=0; i<count; i++)
 568                 threads_sem_wait(&suspend_ack);
 569 #endif
 570         pthread_mutex_unlock(&threadlistlock);
 571 }
 572
 573 void threads_cast_startworld(void)
 574 {
 575         pthread_mutex_lock(&threadlistlock);
 576 #if defined(__DARWIN__)
 577         threads_cast_darwinresume();
 578 #elif defined(__MIPS__)
 579         threads_cast_irixresume();
 580 #else
 581         threads_cast_sendsignals(GC_signum2(), -1);
 582 #endif
 583         pthread_mutex_unlock(&threadlistlock);
 584         unlock_stopworld();
 585 }
 586
 587 #if !defined(__DARWIN__)
 588 static void threads_sigsuspend_handler(ucontext_t *ctx)
 589 {
 590         int sig;
 591         sigset_t sigs;
 592
 593         /* XXX TWISTI: this is just a quick hack */
 594 #if defined(ENABLE_JIT)
 595         thread_restartcriticalsection(ctx);
 596 #endif
 597
 598         /* Do as Boehm does. On IRIX a condition variable is used for wake-up
 599            (not POSIX async-safe). */
 600 #if defined(__IRIX__)
 601         pthread_mutex_lock(&suspend_ack_lock);
 602         threads_sem_post(&suspend_ack);
 603         pthread_cond_wait(&suspend_cond, &suspend_ack_lock);
 604         pthread_mutex_unlock(&suspend_ack_lock);
 605 #else
 606         threads_sem_post(&suspend_ack);
 607
 608         sig = GC_signum2();
 609         sigfillset(&sigs);
 610         sigdelset(&sigs, sig);
 611         sigsuspend(&sigs);
 612 #endif
 613 }
 614
 615 /* This function is called from Boehm GC code. */
 616
 617 int cacao_suspendhandler(ucontext_t *ctx)
 618 {
 619         if (stopworldwhere != STOPWORLD_FROM_CLASS_NUMBERING)
 620                 return 0;
 621
 622         threads_sigsuspend_handler(ctx);
 623         return 1;
 624 }
 625 #endif
 626
 627
 628 /* threads_set_current_threadobject ********************************************
 629
 630    Set the current thread object.
 631
 632    IN:
 633       thread.......the thread object to set
 634
 635 *******************************************************************************/
 636
 637 #if !defined(ENABLE_JVMTI)
 638 static void threads_set_current_threadobject(threadobject *thread)
 639 #else
 640 void threads_set_current_threadobject(threadobject *thread)
 641 #endif
 642 {
 643 #if !defined(HAVE___THREAD)
 644         pthread_setspecific(threads_current_threadobject_key, thread);
 645 #else
 646         threads_current_threadobject = thread;
 647 #endif
 648 }
 649
 650
 651 /* threads_get_current_threadobject ********************************************
 652
 653    Return the threadobject of the current thread.
 654
 655    RETURN VALUE:
 656        the current threadobject * (an instance of java.lang.VMThread)
 657
 658 *******************************************************************************/
 659
 660 threadobject *threads_get_current_threadobject(void)
 661 {
 662         return THREADOBJECT;
 663 }
 664
 665
 666 /* threads_preinit *************************************************************
 667
 668    Do some early initialization of stuff required.
 669
 670 *******************************************************************************/
 671
 672 void threads_preinit(void)
 673 {
 674 #ifndef MUTEXSIM
 675         pthread_mutexattr_t mutexattr;
 676         pthread_mutexattr_init(&mutexattr);
 677         pthread_mutexattr_settype(&mutexattr, PTHREAD_MUTEX_RECURSIVE);
 678         pthread_mutex_init(&compiler_mutex, &mutexattr);
 679         pthread_mutexattr_destroy(&mutexattr);
 680 #else
 681         pthread_mutex_init_rec(&compiler_mutex);
 682 #endif
 683
 684         pthread_mutex_init(&threadlistlock, NULL);
 685         pthread_mutex_init(&stopworldlock, NULL);
 686
 687         /* Allocate something so the garbage collector's signal handlers
 688            are installed. */
 689         heap_allocate(1, false, NULL);
 690
 691         mainthreadobj = NEW(threadobject);
 692         mainthreadobj->tid = pthread_self();
 693         mainthreadobj->index = 1;
 694         mainthreadobj->thinlock = lock_pre_compute_thinlock(mainthreadobj->index);
 695
 696 #if !defined(HAVE___THREAD)
 697         pthread_key_create(&threads_current_threadobject_key, NULL);
 698 #endif
 699         threads_set_current_threadobject(mainthreadobj);
 700
 701         threads_sem_init(&suspend_ack, 0, 0);
 702
 703         /* initialize the threads table */
 704
 705         threads_table_init();
 706
 707         /* initialize subsystems */
 708
 709         lock_init();
 710
 711         critical_init();
 712 }
 713
 714
 715 /* threads_init ****************************************************************
 716
 717    Initializes the threads required by the JVM: main, finalizer.
 718
 719 *******************************************************************************/
 720
 721 bool threads_init(void)
 722 {
 723         java_lang_String      *threadname;
 724         java_lang_Thread      *mainthread;
 725         java_lang_ThreadGroup *threadgroup;
 726         threadobject          *tempthread;
 727         methodinfo            *method;
 728
 729         tempthread = mainthreadobj;
 730
 731         /* XXX We have to find a new way to free lock records */
 732         /*     with the new locking algorithm.                */
 733         /* lock_record_free_pools(mainthreadobj->ee.lockrecordpools); */
 734
 735         /* This is kinda tricky, we grow the java.lang.Thread object so we
 736            can keep the execution environment there. No Thread object must
 737            have been created at an earlier time. */
 738
 739         class_java_lang_VMThread->instancesize = sizeof(threadobject);
 740
 741         /* create a VMThread */
 742
 743         mainthreadobj = (threadobject *) builtin_new(class_java_lang_VMThread);
 744
 745         if (mainthreadobj == NULL)
 746                 return false;
 747
 748         FREE(tempthread, threadobject);
 749
 750         threads_init_threadobject(&mainthreadobj->o);
 751
 752         threads_set_current_threadobject(mainthreadobj);
 753
 754         lock_init_execution_env(mainthreadobj);
 755
 756         mainthreadobj->next = mainthreadobj;
 757         mainthreadobj->prev = mainthreadobj;
 758
 759         threads_table_add(mainthreadobj);
 760
 761 #if defined(ENABLE_INTRP)
 762         /* create interpreter stack */
 763
 764         if (opt_intrp) {
 765                 MSET(intrp_main_stack, 0, u1, opt_stacksize);
 766                 mainthreadobj->_global_sp = intrp_main_stack + opt_stacksize;
 767         }
 768 #endif
 769
 770         threadname = javastring_new(utf_new_char("main"));
 771
 772         /* allocate and init ThreadGroup */
 773
 774         threadgroup = (java_lang_ThreadGroup *)
 775                 native_new_and_init(class_java_lang_ThreadGroup);
 776
 777         if (!threadgroup)
 778                 throw_exception_exit();
 779
 780         /* create a Thread */
 781
 782         mainthread = (java_lang_Thread *) builtin_new(class_java_lang_Thread);
 783
 784         if (mainthread == NULL)
 785                 throw_exception_exit();
 786
 787         mainthreadobj->o.thread = mainthread;
 788
 789         /* call Thread.<init>(Ljava/lang/VMThread;Ljava/lang/String;IZ)V */
 790
 791         method = class_resolveclassmethod(class_java_lang_Thread,
 792                                                                           utf_init,
 793                                                                           utf_new_char("(Ljava/lang/VMThread;Ljava/lang/String;IZ)V"),
 794                                                                           class_java_lang_Thread,
 795                                                                           true);
 796
 797         if (method == NULL)
 798                 return false;
 799
 800         (void) vm_call_method(method, (java_objectheader *) mainthread,
 801                                                   mainthreadobj, threadname, 5, false);
 802
 803         if (*exceptionptr)
 804                 return false;
 805
 806         mainthread->group = threadgroup;
 807
 808         /* add mainthread to ThreadGroup */
 809
 810         method = class_resolveclassmethod(class_java_lang_ThreadGroup,
 811                                                                           utf_new_char("addThread"),
 812                                                                           utf_new_char("(Ljava/lang/Thread;)V"),
 813                                                                           class_java_lang_ThreadGroup,
 814                                                                           true);
 815
 816         if (method == NULL)
 817                 return false;
 818
 819         (void) vm_call_method(method, (java_objectheader *) threadgroup,
 820                                                   mainthread);
 821
 822         if (*exceptionptr)
 823                 return false;
 824
 825         threads_set_thread_priority(pthread_self(), 5);
 826
 827         /* initialize the thread attribute object */
 828
 829         if (pthread_attr_init(&threadattr)) {
 830                 log_println("pthread_attr_init failed: %s", strerror(errno));
 831                 return false;
 832         }
 833
 834         pthread_attr_setdetachstate(&threadattr, PTHREAD_CREATE_DETACHED);
 835
 836         /* everything's ok */
 837
 838         return true;
 839 }
 840
 841
 842 /* threads_table_init *********************************************************
 843
 844    Initialize the global threads table.
 845
 846 ******************************************************************************/
 847
 848 static void threads_table_init(void)
 849 {
 850         s4 size;
 851         s4 i;
 852
 853         size = THREADS_INITIAL_TABLE_SIZE;
 854
 855         threads_table.size = size;
 856         threads_table.table = MNEW(threads_table_entry_t, size);
 857
 858         /* link the entries in a freelist */
 859
 860         for (i=0; i<size; ++i) {
 861                 threads_table.table[i].nextfree = i+1;
 862         }
 863
 864         /* terminate the freelist */
 865
 866         threads_table.table[size-1].nextfree = 0; /* index 0 is never free */
 867 }
 868
 869
 870 /* threads_table_add **********************************************************
 871
 872    Add a thread to the global threads table. The index is entered in the
 873    threadobject. The thinlock value for the thread is pre-computed.
 874
 875    IN:
 876       thread............the thread to add
 877
 878    RETURN VALUE:
 879       The table index for the newly added thread. This value has also been
 880           entered in the threadobject.
 881
 882    PRE-CONDITION:
 883       The caller must hold the threadlistlock!
 884
 885 ******************************************************************************/
 886
 887 static s4 threads_table_add(threadobject *thread)
 888 {
 889         s4 index;
 890         s4 oldsize;
 891         s4 newsize;
 892         s4 i;
 893
 894         /* table[0] serves as the head of the freelist */
 895
 896         index = threads_table.table[0].nextfree;
 897
 898         /* if we got a free index, use it */
 899
 900         if (index) {
 901 got_an_index:
 902                 threads_table.table[0].nextfree = threads_table.table[index].nextfree;
 903                 threads_table.table[index].thread = thread;
 904                 thread->index = index;
 905                 thread->thinlock = lock_pre_compute_thinlock(index);
 906                 return index;
 907         }
 908
 909         /* we must grow the table */
 910
 911         oldsize = threads_table.size;
 912         newsize = oldsize * 2;
 913
 914         threads_table.table = MREALLOC(threads_table.table, threads_table_entry_t,
 915                                                                    oldsize, newsize);
 916         threads_table.size = newsize;
 917
 918         /* link the new entries to a free list */
 919
 920         for (i=oldsize; i<newsize; ++i) {
 921                 threads_table.table[i].nextfree = i+1;
 922         }
 923
 924         /* terminate the freelist */
 925
 926         threads_table.table[newsize-1].nextfree = 0; /* index 0 is never free */
 927
 928         /* use the first of the new entries */
 929
 930         index = oldsize;
 931         goto got_an_index;
 932 }
 933
 934
 935 /* threads_table_remove *******************************************************
 936
 937    Remove a thread from the global threads table.
 938
 939    IN:
 940       thread............the thread to remove
 941
 942    PRE-CONDITION:
 943       The caller must hold the threadlistlock!
 944
 945 ******************************************************************************/
 946
 947 static void threads_table_remove(threadobject *thread)
 948 {
 949         s4 index;
 950
 951         index = thread->index;
 952
 953         /* put the index into the freelist */
 954
 955         threads_table.table[index] = threads_table.table[0];
 956         threads_table.table[0].nextfree = index;
 957
 958         /* delete the index in the threadobject to discover bugs */
 959 #if !defined(NDEBUG)
 960         thread->index = 0;
 961 #endif
 962 }
 963
 964 /* threads_init_threadobject **************************************************
 965
 966    Initialize implementation fields of a java.lang.VMThread.
 967
 968    IN:
 969       t............the java.lang.VMThread
 970
 971 ******************************************************************************/
 972
 973 void threads_init_threadobject(java_lang_VMThread *t)
 974 {
 975         threadobject *thread = (threadobject*) t;
 976
 977         thread->tid = pthread_self();
 978
 979         thread->index = 0;
 980
 981         /* TODO destroy all those things */
 982         pthread_mutex_init(&(thread->joinmutex), NULL);
 983         pthread_cond_init(&(thread->joincond), NULL);
 984
 985         pthread_mutex_init(&(thread->waitmutex), NULL);
 986         pthread_cond_init(&(thread->waitcond), NULL);
 987
 988         thread->interrupted = false;
 989         thread->signaled = false;
 990         thread->sleeping = false;
 991 }
 992
 993
 994 /* threads_startup_thread ******************************************************
 995
 996    Thread startup function called by pthread_create.
 997
 998    NOTE: This function is not called directly by pthread_create. The Boehm GC
 999          inserts its own GC_start_routine in between, which then calls
1000                  threads_startup.
1001
1002    IN:
1003       t............the argument passed to pthread_create, ie. a pointer to
1004                        a startupinfo struct. CAUTION: When the `psem` semaphore
1005                                    is posted, the startupinfo struct becomes invalid! (It
1006                                    is allocated on the stack of threads_start_thread.)
1007
1008 ******************************************************************************/
1009
1010 static void *threads_startup_thread(void *t)
1011 {
1012         startupinfo  *startup;
1013         threadobject *thread;
1014         sem_t        *psem;
1015         threadobject *tnext;
1016         methodinfo   *method;
1017         functionptr   function;
1018
1019 #if defined(ENABLE_INTRP)
1020         u1 *intrp_thread_stack;
1021
1022         /* create interpreter stack */
1023
1024         if (opt_intrp) {
1025                 intrp_thread_stack = (u1 *) alloca(opt_stacksize);
1026                 MSET(intrp_thread_stack, 0, u1, opt_stacksize);
1027         } else {
1028                 intrp_thread_stack = NULL;
1029         }
1030 #endif
1031
1032         /* get passed startupinfo structure and the values in there */
1033
1034         startup = t;
1035         t = NULL; /* make sure it's not used wrongly */
1036
1037         thread   = startup->thread;
1038         function = startup->function;
1039         psem     = startup->psem;
1040
1041         /* Seems like we've encountered a situation where thread->tid was not set by
1042          * pthread_create. We alleviate this problem by waiting for pthread_create
1043          * to return. */
1044         threads_sem_wait(startup->psem_first);
1045
1046         /* set the thread object */
1047
1048 #if defined(__DARWIN__)
1049         thread->mach_thread = mach_thread_self();
1050 #endif
1051         threads_set_current_threadobject(thread);
1052
1053         /* insert the thread into the threadlist and the threads table */
1054
1055         pthread_mutex_lock(&threadlistlock);
1056
1057         thread->prev = mainthreadobj;
1058         thread->next = tnext = mainthreadobj->next;
1059         mainthreadobj->next = thread;
1060         tnext->prev = thread;
1061
1062         threads_table_add(thread);
1063
1064         pthread_mutex_unlock(&threadlistlock);
1065
1066         /* init data structures of this thread */
1067
1068         lock_init_execution_env(thread);
1069
1070         /* tell threads_startup_thread that we registered ourselves */
1071         /* CAUTION: *startup becomes invalid with this!             */
1072
1073         startup = NULL;
1074         threads_sem_post(psem);
1075
1076         /* set our priority */
1077
1078         threads_set_thread_priority(thread->tid, thread->o.thread->priority);
1079
1080 #if defined(ENABLE_INTRP)
1081         /* set interpreter stack */
1082
1083         if (opt_intrp)
1084                 thread->_global_sp = (void *) (intrp_thread_stack + opt_stacksize);
1085 #endif
1086
1087         /* find and run the Thread.run()V method if no other function was passed */
1088
1089         if (function == NULL) {
1090                 method = class_resolveclassmethod(thread->o.header.vftbl->class,
1091                                                                                   utf_run,
1092                                                                                   utf_void__void,
1093                                                                                   thread->o.header.vftbl->class,
1094                                                                                   true);
1095
1096                 if (!method)
1097                         throw_exception();
1098
1099                 (void) vm_call_method(method, (java_objectheader *) thread);
1100
1101         }
1102         else {
1103                 /* call passed function, e.g. finalizer_thread */
1104
1105                 (function)();
1106         }
1107
1108         /* Allow lock record pools to be used by other threads. They
1109            cannot be deleted so we'd better not waste them. */
1110
1111         /* XXX We have to find a new way to free lock records */
1112         /*     with the new locking algorithm.                */
1113         /* lock_record_free_pools(thread->ee.lockrecordpools); */
1114
1115         /* remove thread from thread list and threads table, do this inside a lock */
1116
1117         pthread_mutex_lock(&threadlistlock);
1118
1119         thread->next->prev = thread->prev;
1120         thread->prev->next = thread->next;
1121
1122         threads_table_remove(thread);
1123
1124         pthread_mutex_unlock(&threadlistlock);
1125
1126         /* reset thread id (lock on joinmutex? TWISTI) */
1127
1128         pthread_mutex_lock(&thread->joinmutex);
1129         thread->tid = 0;
1130         pthread_mutex_unlock(&thread->joinmutex);
1131
1132         /* tell everyone that a thread has finished */
1133
1134         pthread_cond_broadcast(&thread->joincond);
1135
1136         return NULL;
1137 }
1138
1139
1140 /* threads_start_thread ********************************************************
1141
1142    Start a thread in the JVM.
1143
1144    IN:
1145       t............the java.lang.Thread object
1146           function.....function to run in the new thread. NULL means that the
1147                        "run" method of the object `t` should be called
1148
1149 ******************************************************************************/
1150
1151 void threads_start_thread(java_lang_Thread *t, functionptr function)
1152 {
1153         sem_t          sem;
1154         sem_t          sem_first;
1155         pthread_attr_t attr;
1156         startupinfo    startup;
1157         threadobject  *thread;
1158
1159         thread = (threadobject *) t->vmThread;
1160
1161         /* fill startupinfo structure passed by pthread_create to
1162          * threads_startup_thread */
1163
1164         startup.thread     = thread;
1165         startup.function   = function;       /* maybe we don't call Thread.run()V */
1166         startup.psem       = &sem;
1167         startup.psem_first = &sem_first;
1168
1169         threads_sem_init(&sem, 0, 0);
1170         threads_sem_init(&sem_first, 0, 0);
1171
1172         /* initialize thread attribute object */
1173
1174         if (pthread_attr_init(&attr))
1175                 vm_abort("pthread_attr_init failed: %s", strerror(errno));
1176
1177         /* initialize thread stacksize */
1178
1179         if (pthread_attr_setstacksize(&attr, opt_stacksize))
1180                 vm_abort("pthread_attr_setstacksize failed: %s", strerror(errno));
1181
1182         /* create the thread */
1183
1184         if (pthread_create(&thread->tid, &attr, threads_startup_thread, &startup))
1185                 vm_abort("pthread_create failed: %s", strerror(errno));
1186
1187         /* signal that pthread_create has returned, so thread->tid is valid */
1188
1189         threads_sem_post(&sem_first);
1190
1191         /* wait here until the thread has entered itself into the thread list */
1192
1193         threads_sem_wait(&sem);
1194
1195         /* cleanup */
1196
1197         sem_destroy(&sem);
1198         sem_destroy(&sem_first);
1199 }
1200
1201
1202 /* threads_find_non_daemon_thread **********************************************
1203
1204    Helper function used by threads_join_all_threads for finding non-daemon threads
1205    that are still running.
1206
1207 *******************************************************************************/
1208
1209 /* At the end of the program, we wait for all running non-daemon threads to die
1210  */
1211
1212 static threadobject *threads_find_non_daemon_thread(threadobject *thread)
1213 {
1214         while (thread != mainthreadobj) {
1215                 if (!thread->o.thread->daemon)
1216                         return thread;
1217                 thread = thread->prev;
1218         }
1219
1220         return NULL;
1221 }
1222
1223
1224 /* threads_join_all_threads ****************************************************
1225
1226    Join all non-daemon threads.
1227
1228 *******************************************************************************/
1229
1230 void threads_join_all_threads(void)
1231 {
1232         threadobject *thread;
1233
1234         pthread_mutex_lock(&threadlistlock);
1235
1236         while ((thread = threads_find_non_daemon_thread(mainthreadobj->prev)) != NULL) {
1237
1238                 pthread_mutex_lock(&thread->joinmutex);
1239
1240                 pthread_mutex_unlock(&threadlistlock);
1241
1242                 while (thread->tid)
1243                         pthread_cond_wait(&thread->joincond, &thread->joinmutex);
1244
1245                 pthread_mutex_unlock(&thread->joinmutex);
1246
1247                 pthread_mutex_lock(&threadlistlock);
1248         }
1249
1250         pthread_mutex_unlock(&threadlistlock);
1251 }
1252
1253
1254 /* threads_timespec_earlier ****************************************************
1255
1256    Return true if timespec tv1 is earlier than timespec tv2.
1257
1258    IN:
1259       tv1..........first timespec
1260           tv2..........second timespec
1261
1262    RETURN VALUE:
1263       true, if the first timespec is earlier
1264
1265 *******************************************************************************/
1266
1267 static inline bool threads_timespec_earlier(const struct timespec *tv1,
1268                                                                                         const struct timespec *tv2)
1269 {
1270         return (tv1->tv_sec < tv2->tv_sec)
1271                                 ||
1272                 (tv1->tv_sec == tv2->tv_sec && tv1->tv_nsec < tv2->tv_nsec);
1273 }
1274
1275
1276 /* threads_current_time_is_earlier_than ****************************************
1277
1278    Check if the current time is earlier than the given timespec.
1279
1280    IN:
1281       tv...........the timespec to compare against
1282
1283    RETURN VALUE:
1284       true, if the current time is earlier
1285
1286 *******************************************************************************/
1287
1288 static bool threads_current_time_is_earlier_than(const struct timespec *tv)
1289 {
1290         struct timeval tvnow;
1291         struct timespec tsnow;
1292
1293         /* get current time */
1294
1295         if (gettimeofday(&tvnow, NULL) != 0)
1296                 vm_abort("gettimeofday failed: %s\n", strerror(errno));
1297
1298         /* convert it to a timespec */
1299
1300         tsnow.tv_sec = tvnow.tv_sec;
1301         tsnow.tv_nsec = tvnow.tv_usec * 1000;
1302
1303         /* compare current time with the given timespec */
1304
1305         return threads_timespec_earlier(&tsnow, tv);
1306 }
1307
1308
1309 /* threads_wait_with_timeout ***************************************************
1310
1311    Wait until the given point in time on a monitor until either
1312    we are notified, we are interrupted, or the time is up.
1313
1314    IN:
1315       t............the current thread
1316           wakeupTime...absolute (latest) wakeup time
1317                            If both tv_sec and tv_nsec are zero, this function
1318                                            waits for an unlimited amount of time.
1319
1320    RETURN VALUE:
1321       true.........if the wait has been interrupted,
1322           false........if the wait was ended by notification or timeout
1323
1324 *******************************************************************************/
1325
1326 static bool threads_wait_with_timeout(threadobject *t,
1327                                                                           struct timespec *wakeupTime)
1328 {
1329         bool wasinterrupted;
1330
1331         /* acquire the waitmutex */
1332
1333         pthread_mutex_lock(&t->waitmutex);
1334
1335         /* mark us as sleeping */
1336
1337         t->sleeping = true;
1338
1339         /* wait on waitcond */
1340
1341         if (wakeupTime->tv_sec || wakeupTime->tv_nsec) {
1342                 /* with timeout */
1343                 while (!t->interrupted && !t->signaled
1344                            && threads_current_time_is_earlier_than(wakeupTime))
1345                 {
1346                         pthread_cond_timedwait(&t->waitcond, &t->waitmutex, wakeupTime);
1347                 }
1348         }
1349         else {
1350                 /* no timeout */
1351                 while (!t->interrupted && !t->signaled)
1352                         pthread_cond_wait(&t->waitcond, &t->waitmutex);
1353         }
1354
1355         /* check if we were interrupted */
1356
1357         wasinterrupted = t->interrupted;
1358
1359         /* reset all flags */
1360
1361         t->interrupted = false;
1362         t->signaled = false;
1363         t->sleeping = false;
1364
1365         /* release the waitmutex */
1366
1367         pthread_mutex_unlock(&t->waitmutex);
1368
1369         return wasinterrupted;
1370 }
1371
1372
1373 /* threads_wait_with_timeout_relative ******************************************
1374
1375    Wait for the given maximum amount of time on a monitor until either
1376    we are notified, we are interrupted, or the time is up.
1377
1378    IN:
1379       t............the current thread
1380           millis.......milliseconds to wait
1381           nanos........nanoseconds to wait
1382
1383    RETURN VALUE:
1384       true.........if the wait has been interrupted,
1385           false........if the wait was ended by notification or timeout
1386
1387 *******************************************************************************/
1388
1389 bool threads_wait_with_timeout_relative(threadobject *t,
1390                                                                                 s8 millis,
1391                                                                                 s4 nanos)
1392 {
1393         struct timespec wakeupTime;
1394
1395         /* calculate the the (latest) wakeup time */
1396
1397         threads_calc_absolute_time(&wakeupTime, millis, nanos);
1398
1399         /* wait */
1400
1401         return threads_wait_with_timeout(t, &wakeupTime);
1402 }
1403
1404
1405 /* threads_calc_absolute_time **************************************************
1406
1407    Calculate the absolute point in time a given number of ms and ns from now.
1408
1409    IN:
1410       millis............milliseconds from now
1411           nanos.............nanoseconds from now
1412
1413    OUT:
1414       *tm...............receives the timespec of the absolute point in time
1415
1416 *******************************************************************************/
1417
1418 static void threads_calc_absolute_time(struct timespec *tm, s8 millis, s4 nanos)
1419 {
1420         if ((millis != 0x7fffffffffffffffLLU) && (millis || nanos)) {
1421                 struct timeval tv;
1422                 long nsec;
1423                 gettimeofday(&tv, NULL);
1424                 tv.tv_sec += millis / 1000;
1425                 millis %= 1000;
1426                 nsec = tv.tv_usec * 1000 + (s4) millis * 1000000 + nanos;
1427                 tm->tv_sec = tv.tv_sec + nsec / 1000000000;
1428                 tm->tv_nsec = nsec % 1000000000;
1429         }
1430         else {
1431                 tm->tv_sec = 0;
1432                 tm->tv_nsec = 0;
1433         }
1434 }
1435
1436
1437 /* threads_interrupt_thread ****************************************************
1438
1439    Interrupt the given thread.
1440
1441    The thread gets the "waitcond" signal and
1442    its interrupted flag is set to true.
1443
1444    IN:
1445       thread............the thread to interrupt
1446
1447 *******************************************************************************/
1448
1449 void threads_interrupt_thread(java_lang_VMThread *thread)
1450 {
1451         threadobject *t = (threadobject*) thread;
1452
1453         /* signal the thread a "waitcond" and tell it that it has been */
1454         /* interrupted                                                 */
1455
1456         pthread_mutex_lock(&t->waitmutex);
1457         if (t->sleeping)
1458                 pthread_cond_signal(&t->waitcond);
1459         t->interrupted = true;
1460         pthread_mutex_unlock(&t->waitmutex);
1461 }
1462
1463
1464 /* threads_check_if_interrupted_and_reset **************************************
1465
1466    Check if the current thread has been interrupted and reset the
1467    interruption flag.
1468
1469    RETURN VALUE:
1470       true, if the current thread had been interrupted
1471
1472 *******************************************************************************/
1473
1474 bool threads_check_if_interrupted_and_reset(void)
1475 {
1476         threadobject *t;
1477         bool intr;
1478
1479         t = (threadobject*) THREADOBJECT;
1480
1481         intr = t->interrupted;
1482
1483         t->interrupted = false;
1484
1485         return intr;
1486 }
1487
1488
1489 /* threads_thread_has_been_interrupted *********************************************************
1490
1491    Check if the given thread has been interrupted
1492
1493    IN:
1494       t............the thread to check
1495
1496    RETURN VALUE:
1497       true, if the given thread had been interrupted
1498
1499 *******************************************************************************/
1500
1501 bool threads_thread_has_been_interrupted(java_lang_VMThread *thread)
1502 {
1503         threadobject *t;
1504
1505         t = (threadobject*) thread;
1506
1507         return t->interrupted;
1508 }
1509
1510
1511 /* threads_sleep ***************************************************************
1512
1513    Sleep the current thread for the specified amount of time.
1514
1515 *******************************************************************************/
1516
1517 void threads_sleep(s8 millis, s4 nanos)
1518 {
1519         threadobject       *t;
1520         struct timespec    wakeupTime;
1521         bool               wasinterrupted;
1522
1523         t = (threadobject *) THREADOBJECT;
1524
1525         threads_calc_absolute_time(&wakeupTime, millis, nanos);
1526
1527         wasinterrupted = threads_wait_with_timeout(t, &wakeupTime);
1528
1529         if (wasinterrupted)
1530                 *exceptionptr = new_exception(string_java_lang_InterruptedException);
1531 }
1532
1533
1534 /* threads_yield *****************************************************************
1535
1536    Yield to the scheduler.
1537
1538 *******************************************************************************/
1539
1540 void threads_yield(void)
1541 {
1542         sched_yield();
1543 }
1544
1545
1546 /* threads_java_lang_Thread_set_priority ***********************************************************
1547
1548    Set the priority for the given java.lang.Thread.
1549
1550    IN:
1551       t............the java.lang.Thread
1552           priority.....the priority
1553
1554 *******************************************************************************/
1555
1556 void threads_java_lang_Thread_set_priority(java_lang_Thread *t, s4 priority)
1557 {
1558         threadobject *thread;
1559
1560         thread = (threadobject*) t->vmThread;
1561
1562         threads_set_thread_priority(thread->tid, priority);
1563 }
1564
1565
1566 /* threads_dump ****************************************************************
1567
1568    Dumps info for all threads running in the JVM. This function is
1569    called when SIGQUIT (<ctrl>-\) is sent to CACAO.
1570
1571 *******************************************************************************/
1572
1573 void threads_dump(void)
1574 {
1575         threadobject       *tobj;
1576         java_lang_VMThread *vmt;
1577         java_lang_Thread   *t;
1578         utf                *name;
1579
1580         tobj = mainthreadobj;
1581
1582         printf("Full thread dump CACAO "VERSION":\n");
1583
1584         /* iterate over all started threads */
1585
1586         do {
1587                 /* get thread objects */
1588
1589                 vmt = &tobj->o;
1590                 t   = vmt->thread;
1591
1592                 /* the thread may be currently in initalization, don't print it */
1593
1594                 if (t) {
1595                         /* get thread name */
1596
1597                         name = javastring_toutf(t->name, false);
1598
1599                         printf("\n\"");
1600                         utf_display_printable_ascii(name);
1601                         printf("\" ");
1602
1603                         if (t->daemon)
1604                                 printf("daemon ");
1605
1606 #if SIZEOF_VOID_P == 8
1607                         printf("prio=%d tid=0x%016lx\n", t->priority, tobj->tid);
1608 #else
1609                         printf("prio=%d tid=0x%08lx\n", t->priority, tobj->tid);
1610 #endif
1611
1612                         /* send SIGUSR1 to thread to print stacktrace */
1613
1614                         pthread_kill(tobj->tid, SIGUSR1);
1615
1616                         /* sleep this thread a bit, so the signal can reach the thread */
1617
1618                         threads_sleep(10, 0);
1619                 }
1620
1621                 tobj = tobj->next;
1622         } while (tobj && (tobj != mainthreadobj));
1623 }
1624
1625
1626 /* threads_table_dump *********************************************************
1627
1628    Dump the threads table for debugging purposes.
1629
1630    IN:
1631       file..............stream to write to
1632
1633 ******************************************************************************/
1634
1635 #if !defined(NDEBUG)
1636 static void threads_table_dump(FILE *file)
1637 {
1638         s4 i;
1639         s4 size;
1640         ptrint index;
1641
1642         pthread_mutex_lock(&threadlistlock);
1643
1644         size = threads_table.size;
1645
1646         fprintf(file, "======== THREADS TABLE (size %d) ========\n", size);
1647
1648         for (i=0; i<size; ++i) {
1649                 index = threads_table.table[i].nextfree;
1650
1651                 fprintf(file, "%4d: ", i);
1652
1653                 if (index < size) {
1654                         fprintf(file, "free, nextfree = %d\n", index);
1655                 }
1656                 else {
1657                         fprintf(file, "thread %p\n", (void*) threads_table.table[i].thread);
1658                 }
1659         }
1660
1661         fprintf(file, "======== END OF THREADS TABLE ========\n");
1662
1663         pthread_mutex_unlock(&threadlistlock);
1664 }
1665 #endif
1666
1667 /*
1668  * These are local overrides for various environment variables in Emacs.
1669  * Please do not remove this and leave it at the end of the file, where
1670  * Emacs will automagically detect them.
1671  * ---------------------------------------------------------------------
1672  * Local variables:
1673  * mode: c
1674  * indent-tabs-mode: t
1675  * c-basic-offset: 4
1676  * tab-width: 4
1677  * End:
1678  * vim:noexpandtab:sw=4:ts=4:
1679  */