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 5704 2006-10-05 20:30:12Z edwin $
  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 #if defined(ENABLE_JVMTI)
  94 #include "native/jvmti/cacaodbg.h"
  95 #endif
  96
  97 #if defined(__DARWIN__)
  98 /* Darwin has no working semaphore implementation.  This one is taken
  99    from Boehm-GC. */
 100
 101 /*
 102    This is a very simple semaphore implementation for darwin. It
 103    is implemented in terms of pthreads calls so it isn't async signal
 104    safe. This isn't a problem because signals aren't used to
 105    suspend threads on darwin.
 106 */
 107
 108 static int sem_init(sem_t *sem, int pshared, int value)
 109 {
 110         if (pshared)
 111                 assert(0);
 112
 113         sem->value = value;
 114
 115         if (pthread_mutex_init(&sem->mutex, NULL) < 0)
 116                 return -1;
 117
 118         if (pthread_cond_init(&sem->cond, NULL) < 0)
 119                 return -1;
 120
 121         return 0;
 122 }
 123
 124 static int sem_post(sem_t *sem)
 125 {
 126         if (pthread_mutex_lock(&sem->mutex) < 0)
 127                 return -1;
 128
 129         sem->value++;
 130
 131         if (pthread_cond_signal(&sem->cond) < 0) {
 132                 pthread_mutex_unlock(&sem->mutex);
 133                 return -1;
 134         }
 135
 136         if (pthread_mutex_unlock(&sem->mutex) < 0)
 137                 return -1;
 138
 139         return 0;
 140 }
 141
 142 static int sem_wait(sem_t *sem)
 143 {
 144         if (pthread_mutex_lock(&sem->mutex) < 0)
 145                 return -1;
 146
 147         while (sem->value == 0) {
 148                 pthread_cond_wait(&sem->cond, &sem->mutex);
 149         }
 150
 151         sem->value--;
 152
 153         if (pthread_mutex_unlock(&sem->mutex) < 0)
 154                 return -1;
 155
 156         return 0;
 157 }
 158
 159 static int sem_destroy(sem_t *sem)
 160 {
 161         if (pthread_cond_destroy(&sem->cond) < 0)
 162                 return -1;
 163
 164         if (pthread_mutex_destroy(&sem->mutex) < 0)
 165                 return -1;
 166
 167         return 0;
 168 }
 169 #endif /* defined(__DARWIN__) */
 170
 171
 172 /* internally used constants **************************************************/
 173
 174 /* CAUTION: Do not change these values. Boehm GC code depends on them.        */
 175 #define STOPWORLD_FROM_GC               1
 176 #define STOPWORLD_FROM_CLASS_NUMBERING  2
 177
 178 #define THREADS_INITIAL_TABLE_SIZE      8
 179
 180
 181 /* startupinfo *****************************************************************
 182
 183    Struct used to pass info from threads_start_thread to
 184    threads_startup_thread.
 185
 186 ******************************************************************************/
 187
 188 typedef struct {
 189         threadobject *thread;      /* threadobject for this thread             */
 190         functionptr   function;    /* function to run in the new thread        */
 191         sem_t        *psem;        /* signals when thread has been entered     */
 192                                    /* in the thread list                       */
 193         sem_t        *psem_first;  /* signals when pthread_create has returned */
 194 } startupinfo;
 195
 196
 197 /* prototypes *****************************************************************/
 198
 199 static void threads_table_init(void);
 200 static s4 threads_table_add(threadobject *thread);
 201 static void threads_table_remove(threadobject *thread);
 202 static void threads_calc_absolute_time(struct timespec *tm, s8 millis, s4 nanos);
 203
 204 #if !defined(NDEBUG)
 205 static void threads_table_dump(FILE *file);
 206 #endif
 207
 208 /******************************************************************************/
 209 /* GLOBAL VARIABLES                                                           */
 210 /******************************************************************************/
 211
 212 /* the main thread                                                            */
 213 threadobject *mainthreadobj;
 214
 215 static methodinfo *method_thread_init;
 216 static methodinfo *method_threadgroup_add;
 217
 218 /* the thread object of the current thread                                    */
 219 /* This is either a thread-local variable defined with __thread, or           */
 220 /* a thread-specific value stored with key threads_current_threadobject_key.  */
 221 #if defined(HAVE___THREAD)
 222 __thread threadobject *threads_current_threadobject;
 223 #else
 224 pthread_key_t threads_current_threadobject_key;
 225 #endif
 226
 227 /* global threads table                                                       */
 228 static threads_table_t threads_table;
 229
 230 /* global compiler mutex                                                      */
 231 static pthread_mutex_rec_t compiler_mutex;
 232
 233 /* global mutex for changing the thread list                                  */
 234 static pthread_mutex_t threadlistlock;
 235
 236 /* global mutex for stop-the-world                                            */
 237 static pthread_mutex_t stopworldlock;
 238
 239 /* this is one of the STOPWORLD_FROM_ constants, telling why the world is     */
 240 /* being stopped                                                              */
 241 static volatile int stopworldwhere;
 242
 243 /* semaphore used for acknowleding thread suspension                          */
 244 static sem_t suspend_ack;
 245 #if defined(__MIPS__)
 246 static pthread_mutex_t suspend_ack_lock = PTHREAD_MUTEX_INITIALIZER;
 247 static pthread_cond_t suspend_cond = PTHREAD_COND_INITIALIZER;
 248 #endif
 249
 250 static pthread_attr_t threadattr;
 251
 252 /* mutexes used by the fake atomic instructions                               */
 253 #if defined(USE_FAKE_ATOMIC_INSTRUCTIONS)
 254 pthread_mutex_t _atomic_add_lock = PTHREAD_MUTEX_INITIALIZER;
 255 pthread_mutex_t _cas_lock = PTHREAD_MUTEX_INITIALIZER;
 256 pthread_mutex_t _mb_lock = PTHREAD_MUTEX_INITIALIZER;
 257 #endif
 258
 259
 260 /******************************************************************************/
 261 /* Recursive Mutex Implementation for Darwin                                  */
 262 /******************************************************************************/
 263
 264 #if defined(MUTEXSIM)
 265
 266 /* We need this for older MacOSX (10.1.x) */
 267
 268 void pthread_mutex_init_rec(pthread_mutex_rec_t *m)
 269 {
 270         pthread_mutex_init(&m->mutex, NULL);
 271         m->count = 0;
 272 }
 273
 274 void pthread_mutex_destroy_rec(pthread_mutex_rec_t *m)
 275 {
 276         pthread_mutex_destroy(&m->mutex);
 277 }
 278
 279 void pthread_mutex_lock_rec(pthread_mutex_rec_t *m)
 280 {
 281         for (;;) {
 282                 if (!m->count)
 283                 {
 284                         pthread_mutex_lock(&m->mutex);
 285                         m->owner = pthread_self();
 286                         m->count++;
 287                         break;
 288                 }
 289                 else {
 290                         if (m->owner != pthread_self()) {
 291                                 pthread_mutex_lock(&m->mutex);
 292                         }
 293                         else {
 294                                 m->count++;
 295                                 break;
 296                         }
 297                 }
 298         }
 299 }
 300
 301 void pthread_mutex_unlock_rec(pthread_mutex_rec_t *m)
 302 {
 303         if (!--m->count)
 304                 pthread_mutex_unlock(&m->mutex);
 305 }
 306
 307 #endif /* defined(MUTEXSIM) */
 308
 309
 310 /* threads_sem_init ************************************************************
 311
 312    Initialize a semaphore. Checks against errors and interruptions.
 313
 314    IN:
 315        sem..............the semaphore to initialize
 316            shared...........true if this semaphore will be shared between processes
 317            value............the initial value for the semaphore
 318
 319 *******************************************************************************/
 320
 321 void threads_sem_init(sem_t *sem, bool shared, int value)
 322 {
 323         int r;
 324
 325         assert(sem);
 326
 327         do {
 328                 r = sem_init(sem, shared, value);
 329                 if (r == 0)
 330                         return;
 331         } while (errno == EINTR);
 332
 333         vm_abort("sem_init failed: %s", strerror(errno));
 334 }
 335
 336
 337 /* threads_sem_wait ************************************************************
 338
 339    Wait for a semaphore, non-interruptible.
 340
 341    IMPORTANT: Always use this function instead of `sem_wait` directly, as
 342               `sem_wait` may be interrupted by signals!
 343
 344    IN:
 345        sem..............the semaphore to wait on
 346
 347 *******************************************************************************/
 348
 349 void threads_sem_wait(sem_t *sem)
 350 {
 351         int r;
 352
 353         assert(sem);
 354
 355         do {
 356                 r = sem_wait(sem);
 357                 if (r == 0)
 358                         return;
 359         } while (errno == EINTR);
 360
 361         vm_abort("sem_wait failed: %s", strerror(errno));
 362 }
 363
 364
 365 /* threads_sem_post ************************************************************
 366
 367    Increase the count of a semaphore. Checks for errors.
 368
 369    IN:
 370        sem..............the semaphore to increase the count of
 371
 372 *******************************************************************************/
 373
 374 void threads_sem_post(sem_t *sem)
 375 {
 376         int r;
 377
 378         assert(sem);
 379
 380         /* unlike sem_wait, sem_post is not interruptible */
 381
 382         r = sem_post(sem);
 383         if (r == 0)
 384                 return;
 385
 386         vm_abort("sem_post failed: %s", strerror(errno));
 387 }
 388
 389
 390 /* threads_set_thread_priority *************************************************
 391
 392    Set the priority of the given thread.
 393
 394    IN:
 395       tid..........thread id
 396           priority.....priority to set
 397
 398 ******************************************************************************/
 399
 400 static void threads_set_thread_priority(pthread_t tid, int priority)
 401 {
 402         struct sched_param schedp;
 403         int policy;
 404
 405         pthread_getschedparam(tid, &policy, &schedp);
 406         schedp.sched_priority = priority;
 407         pthread_setschedparam(tid, policy, &schedp);
 408 }
 409
 410
 411 /* compiler_lock ***************************************************************
 412
 413    Enter the compiler lock.
 414
 415 ******************************************************************************/
 416
 417 void compiler_lock(void)
 418 {
 419         pthread_mutex_lock_rec(&compiler_mutex);
 420 }
 421
 422
 423 /* compiler_unlock *************************************************************
 424
 425    Release the compiler lock.
 426
 427 ******************************************************************************/
 428
 429 void compiler_unlock(void)
 430 {
 431         pthread_mutex_unlock_rec(&compiler_mutex);
 432 }
 433
 434
 435 /* lock_stopworld **************************************************************
 436
 437    Enter the stopworld lock, specifying why the world shall be stopped.
 438
 439    IN:
 440       where........ STOPWORLD_FROM_GC              (1) from within GC
 441                     STOPWORLD_FROM_CLASS_NUMBERING (2) class numbering
 442
 443 ******************************************************************************/
 444
 445 void lock_stopworld(int where)
 446 {
 447         pthread_mutex_lock(&stopworldlock);
 448         stopworldwhere = where;
 449 }
 450
 451
 452 /* unlock_stopworld ************************************************************
 453
 454    Release the stopworld lock.
 455
 456 ******************************************************************************/
 457
 458 void unlock_stopworld(void)
 459 {
 460         stopworldwhere = 0;
 461         pthread_mutex_unlock(&stopworldlock);
 462 }
 463
 464 #if !defined(__DARWIN__)
 465 /* Caller must hold threadlistlock */
 466 static int threads_cast_sendsignals(int sig, int count)
 467 {
 468         /* Count threads */
 469         threadobject *tobj = mainthreadobj;
 470         threadobject *self = THREADOBJECT;
 471
 472         if (count == 0) {
 473                 do {
 474                         count++;
 475                         tobj = tobj->next;
 476                 } while (tobj != mainthreadobj);
 477         }
 478
 479         assert(tobj == mainthreadobj);
 480
 481         do {
 482                 if (tobj != self)
 483                         pthread_kill(tobj->tid, sig);
 484                 tobj = tobj->next;
 485         } while (tobj != mainthreadobj);
 486
 487         return count - 1;
 488 }
 489
 490 #else
 491
 492 static void threads_cast_darwinstop(void)
 493 {
 494         threadobject *tobj = mainthreadobj;
 495         threadobject *self = THREADOBJECT;
 496
 497         do {
 498                 if (tobj != self)
 499                 {
 500                         thread_state_flavor_t flavor = MACHINE_THREAD_STATE;
 501                         mach_msg_type_number_t thread_state_count = MACHINE_THREAD_STATE_COUNT;
 502 #if defined(__I386__)
 503                         i386_thread_state_t thread_state;
 504 #else
 505                         ppc_thread_state_t thread_state;
 506 #endif
 507                         mach_port_t thread = tobj->mach_thread;
 508                         kern_return_t r;
 509
 510                         r = thread_suspend(thread);
 511                         if (r != KERN_SUCCESS) {
 512                                 log_text("thread_suspend failed");
 513                                 assert(0);
 514                         }
 515
 516                         r = thread_get_state(thread, flavor,
 517                                 (natural_t*)&thread_state, &thread_state_count);
 518                         if (r != KERN_SUCCESS) {
 519                                 log_text("thread_get_state failed");
 520                                 assert(0);
 521                         }
 522
 523                         thread_restartcriticalsection(&thread_state);
 524
 525                         r = thread_set_state(thread, flavor,
 526                                 (natural_t*)&thread_state, thread_state_count);
 527                         if (r != KERN_SUCCESS) {
 528                                 log_text("thread_set_state failed");
 529                                 assert(0);
 530                         }
 531                 }
 532                 tobj = tobj->next;
 533         } while (tobj != mainthreadobj);
 534 }
 535
 536 static void threads_cast_darwinresume(void)
 537 {
 538         threadobject *tobj = mainthreadobj;
 539         threadobject *self = THREADOBJECT;
 540
 541         do {
 542                 if (tobj != self)
 543                 {
 544                         mach_port_t thread = tobj->mach_thread;
 545                         kern_return_t r;
 546
 547                         r = thread_resume(thread);
 548                         if (r != KERN_SUCCESS) {
 549                                 log_text("thread_resume failed");
 550                                 assert(0);
 551                         }
 552                 }
 553                 tobj = tobj->next;
 554         } while (tobj != mainthreadobj);
 555 }
 556
 557 #endif
 558
 559 #if defined(__MIPS__)
 560 static void threads_cast_irixresume(void)
 561 {
 562         pthread_mutex_lock(&suspend_ack_lock);
 563         pthread_cond_broadcast(&suspend_cond);
 564         pthread_mutex_unlock(&suspend_ack_lock);
 565 }
 566 #endif
 567
 568 void threads_cast_stopworld(void)
 569 {
 570         int count, i;
 571         lock_stopworld(STOPWORLD_FROM_CLASS_NUMBERING);
 572         pthread_mutex_lock(&threadlistlock);
 573 #if defined(__DARWIN__)
 574         threads_cast_darwinstop();
 575 #elif defined(__CYGWIN__)
 576         /* TODO */
 577         assert(0);
 578 #else
 579         count = threads_cast_sendsignals(GC_signum1(), 0);
 580         for (i=0; i<count; i++)
 581                 threads_sem_wait(&suspend_ack);
 582 #endif
 583         pthread_mutex_unlock(&threadlistlock);
 584 }
 585
 586 void threads_cast_startworld(void)
 587 {
 588         pthread_mutex_lock(&threadlistlock);
 589 #if defined(__DARWIN__)
 590         threads_cast_darwinresume();
 591 #elif defined(__MIPS__)
 592         threads_cast_irixresume();
 593 #elif defined(__CYGWIN__)
 594         /* TODO */
 595         assert(0);
 596 #else
 597         threads_cast_sendsignals(GC_signum2(), -1);
 598 #endif
 599         pthread_mutex_unlock(&threadlistlock);
 600         unlock_stopworld();
 601 }
 602
 603 #if !defined(__DARWIN__)
 604 static void threads_sigsuspend_handler(ucontext_t *ctx)
 605 {
 606         int sig;
 607         sigset_t sigs;
 608
 609         /* XXX TWISTI: this is just a quick hack */
 610 #if defined(ENABLE_JIT)
 611         thread_restartcriticalsection(ctx);
 612 #endif
 613
 614         /* Do as Boehm does. On IRIX a condition variable is used for wake-up
 615            (not POSIX async-safe). */
 616 #if defined(__IRIX__)
 617         pthread_mutex_lock(&suspend_ack_lock);
 618         threads_sem_post(&suspend_ack);
 619         pthread_cond_wait(&suspend_cond, &suspend_ack_lock);
 620         pthread_mutex_unlock(&suspend_ack_lock);
 621 #elif defined(__CYGWIN__)
 622         /* TODO */
 623         assert(0);
 624 #else
 625         threads_sem_post(&suspend_ack);
 626
 627         sig = GC_signum2();
 628         sigfillset(&sigs);
 629         sigdelset(&sigs, sig);
 630         sigsuspend(&sigs);
 631 #endif
 632 }
 633
 634 /* This function is called from Boehm GC code. */
 635
 636 int cacao_suspendhandler(ucontext_t *ctx)
 637 {
 638         if (stopworldwhere != STOPWORLD_FROM_CLASS_NUMBERING)
 639                 return 0;
 640
 641         threads_sigsuspend_handler(ctx);
 642         return 1;
 643 }
 644 #endif
 645
 646 /* threads_set_current_threadobject ********************************************
 647
 648    Set the current thread object.
 649
 650    IN:
 651       thread.......the thread object to set
 652
 653 *******************************************************************************/
 654
 655 static void threads_set_current_threadobject(threadobject *thread)
 656 {
 657 #if !defined(HAVE___THREAD)
 658         pthread_setspecific(threads_current_threadobject_key, thread);
 659 #else
 660         threads_current_threadobject = thread;
 661 #endif
 662 }
 663
 664
 665 /* threads_get_current_threadobject ********************************************
 666
 667    Return the threadobject of the current thread.
 668
 669    RETURN VALUE:
 670        the current threadobject * (an instance of java.lang.VMThread)
 671
 672 *******************************************************************************/
 673
 674 threadobject *threads_get_current_threadobject(void)
 675 {
 676         return THREADOBJECT;
 677 }
 678
 679
 680 /* threads_preinit *************************************************************
 681
 682    Do some early initialization of stuff required.
 683
 684 *******************************************************************************/
 685
 686 void threads_preinit(void)
 687 {
 688 #ifndef MUTEXSIM
 689         pthread_mutexattr_t mutexattr;
 690         pthread_mutexattr_init(&mutexattr);
 691         pthread_mutexattr_settype(&mutexattr, PTHREAD_MUTEX_RECURSIVE);
 692         pthread_mutex_init(&compiler_mutex, &mutexattr);
 693         pthread_mutexattr_destroy(&mutexattr);
 694 #else
 695         pthread_mutex_init_rec(&compiler_mutex);
 696 #endif
 697
 698         pthread_mutex_init(&threadlistlock, NULL);
 699         pthread_mutex_init(&stopworldlock, NULL);
 700
 701         /* Allocate something so the garbage collector's signal handlers
 702            are installed. */
 703         heap_allocate(1, false, NULL);
 704
 705         mainthreadobj = NEW(threadobject);
 706         mainthreadobj->tid = pthread_self();
 707         mainthreadobj->index = 1;
 708         mainthreadobj->thinlock = lock_pre_compute_thinlock(mainthreadobj->index);
 709
 710 #if !defined(HAVE___THREAD)
 711         pthread_key_create(&threads_current_threadobject_key, NULL);
 712 #endif
 713         threads_set_current_threadobject(mainthreadobj);
 714
 715         threads_sem_init(&suspend_ack, 0, 0);
 716
 717         /* initialize the threads table */
 718
 719         threads_table_init();
 720
 721         /* initialize subsystems */
 722
 723         lock_init();
 724
 725         critical_init();
 726 }
 727
 728
 729 /* threads_init ****************************************************************
 730
 731    Initializes the threads required by the JVM: main, finalizer.
 732
 733 *******************************************************************************/
 734
 735 bool threads_init(void)
 736 {
 737         java_lang_String      *threadname;
 738         java_lang_Thread      *mainthread;
 739         java_lang_ThreadGroup *threadgroup;
 740         threadobject          *tempthread;
 741
 742         tempthread = mainthreadobj;
 743
 744         /* XXX We have to find a new way to free lock records */
 745         /*     with the new locking algorithm.                */
 746         /* lock_record_free_pools(mainthreadobj->ee.lockrecordpools); */
 747
 748         /* This is kinda tricky, we grow the java.lang.Thread object so we
 749            can keep the execution environment there. No Thread object must
 750            have been created at an earlier time. */
 751
 752         class_java_lang_VMThread->instancesize = sizeof(threadobject);
 753
 754         /* get methods we need in this file */
 755
 756         method_thread_init =
 757                 class_resolveclassmethod(class_java_lang_Thread,
 758                                                                  utf_init,
 759                                                                  utf_new_char("(Ljava/lang/VMThread;Ljava/lang/String;IZ)V"),
 760                                                                  class_java_lang_Thread,
 761                                                                  true);
 762
 763         if (method_thread_init == NULL)
 764                 return false;
 765
 766         method_threadgroup_add =
 767                 class_resolveclassmethod(class_java_lang_ThreadGroup,
 768                                                                  utf_new_char("addThread"),
 769                                                                  utf_new_char("(Ljava/lang/Thread;)V"),
 770                                                                  class_java_lang_ThreadGroup,
 771                                                                  true);
 772
 773         if (method_threadgroup_add == NULL)
 774                 return false;
 775
 776         /* create a VMThread */
 777
 778         mainthreadobj = (threadobject *) builtin_new(class_java_lang_VMThread);
 779
 780         if (mainthreadobj == NULL)
 781                 return false;
 782
 783         FREE(tempthread, threadobject);
 784
 785         threads_init_threadobject(&mainthreadobj->o);
 786
 787         threads_set_current_threadobject(mainthreadobj);
 788
 789         lock_init_execution_env(mainthreadobj);
 790
 791         mainthreadobj->next = mainthreadobj;
 792         mainthreadobj->prev = mainthreadobj;
 793
 794         threads_table_add(mainthreadobj);
 795
 796         /* mark main thread as Java thread */
 797
 798         mainthreadobj->flags = THREAD_FLAG_JAVA;
 799
 800 #if defined(ENABLE_INTRP)
 801         /* create interpreter stack */
 802
 803         if (opt_intrp) {
 804                 MSET(intrp_main_stack, 0, u1, opt_stacksize);
 805                 mainthreadobj->_global_sp = intrp_main_stack + opt_stacksize;
 806         }
 807 #endif
 808
 809         threadname = javastring_new(utf_new_char("main"));
 810
 811         /* allocate and init ThreadGroup */
 812
 813         threadgroup = (java_lang_ThreadGroup *)
 814                 native_new_and_init(class_java_lang_ThreadGroup);
 815
 816         if (!threadgroup)
 817                 throw_exception_exit();
 818
 819         /* create a Thread */
 820
 821         mainthread = (java_lang_Thread *) builtin_new(class_java_lang_Thread);
 822
 823         if (mainthread == NULL)
 824                 throw_exception_exit();
 825
 826         mainthreadobj->o.thread = mainthread;
 827
 828         /* call Thread.<init>(Ljava/lang/VMThread;Ljava/lang/String;IZ)V */
 829
 830         (void) vm_call_method(method_thread_init, (java_objectheader *) mainthread,
 831                                                   mainthreadobj, threadname, NORM_PRIORITY, false);
 832
 833         if (*exceptionptr)
 834                 return false;
 835
 836         mainthread->group = threadgroup;
 837
 838         /* add mainthread to ThreadGroup */
 839
 840         (void) vm_call_method(method_threadgroup_add,
 841                                                   (java_objectheader *) threadgroup,
 842                                                   mainthread);
 843
 844         if (*exceptionptr)
 845                 return false;
 846
 847         threads_set_thread_priority(pthread_self(), NORM_PRIORITY);
 848
 849         /* initialize the thread attribute object */
 850
 851         if (pthread_attr_init(&threadattr)) {
 852                 log_println("pthread_attr_init failed: %s", strerror(errno));
 853                 return false;
 854         }
 855
 856         pthread_attr_setdetachstate(&threadattr, PTHREAD_CREATE_DETACHED);
 857
 858         /* everything's ok */
 859
 860         return true;
 861 }
 862
 863
 864 /* threads_table_init *********************************************************
 865
 866    Initialize the global threads table.
 867
 868 ******************************************************************************/
 869
 870 static void threads_table_init(void)
 871 {
 872         s4 size;
 873         s4 i;
 874
 875         size = THREADS_INITIAL_TABLE_SIZE;
 876
 877         threads_table.size = size;
 878         threads_table.table = MNEW(threads_table_entry_t, size);
 879
 880         /* link the entries in a freelist */
 881
 882         for (i=0; i<size; ++i) {
 883                 threads_table.table[i].nextfree = i+1;
 884         }
 885
 886         /* terminate the freelist */
 887
 888         threads_table.table[size-1].nextfree = 0; /* index 0 is never free */
 889 }
 890
 891
 892 /* threads_table_add **********************************************************
 893
 894    Add a thread to the global threads table. The index is entered in the
 895    threadobject. The thinlock value for the thread is pre-computed.
 896
 897    IN:
 898       thread............the thread to add
 899
 900    RETURN VALUE:
 901       The table index for the newly added thread. This value has also been
 902           entered in the threadobject.
 903
 904    PRE-CONDITION:
 905       The caller must hold the threadlistlock!
 906
 907 ******************************************************************************/
 908
 909 static s4 threads_table_add(threadobject *thread)
 910 {
 911         s4 index;
 912         s4 oldsize;
 913         s4 newsize;
 914         s4 i;
 915
 916         /* table[0] serves as the head of the freelist */
 917
 918         index = threads_table.table[0].nextfree;
 919
 920         /* if we got a free index, use it */
 921
 922         if (index) {
 923 got_an_index:
 924                 threads_table.table[0].nextfree = threads_table.table[index].nextfree;
 925                 threads_table.table[index].thread = thread;
 926                 thread->index = index;
 927                 thread->thinlock = lock_pre_compute_thinlock(index);
 928                 return index;
 929         }
 930
 931         /* we must grow the table */
 932
 933         oldsize = threads_table.size;
 934         newsize = oldsize * 2;
 935
 936         threads_table.table = MREALLOC(threads_table.table, threads_table_entry_t,
 937                                                                    oldsize, newsize);
 938         threads_table.size = newsize;
 939
 940         /* link the new entries to a free list */
 941
 942         for (i=oldsize; i<newsize; ++i) {
 943                 threads_table.table[i].nextfree = i+1;
 944         }
 945
 946         /* terminate the freelist */
 947
 948         threads_table.table[newsize-1].nextfree = 0; /* index 0 is never free */
 949
 950         /* use the first of the new entries */
 951
 952         index = oldsize;
 953         goto got_an_index;
 954 }
 955
 956
 957 /* threads_table_remove *******************************************************
 958
 959    Remove a thread from the global threads table.
 960
 961    IN:
 962       thread............the thread to remove
 963
 964    PRE-CONDITION:
 965       The caller must hold the threadlistlock!
 966
 967 ******************************************************************************/
 968
 969 static void threads_table_remove(threadobject *thread)
 970 {
 971         s4 index;
 972
 973         index = thread->index;
 974
 975         /* put the index into the freelist */
 976
 977         threads_table.table[index] = threads_table.table[0];
 978         threads_table.table[0].nextfree = index;
 979
 980         /* delete the index in the threadobject to discover bugs */
 981 #if !defined(NDEBUG)
 982         thread->index = 0;
 983 #endif
 984 }
 985
 986 /* threads_init_threadobject **************************************************
 987
 988    Initialize implementation fields of a java.lang.VMThread.
 989
 990    IN:
 991       t............the java.lang.VMThread
 992
 993 ******************************************************************************/
 994
 995 void threads_init_threadobject(java_lang_VMThread *t)
 996 {
 997         threadobject *thread = (threadobject*) t;
 998
 999         thread->tid = pthread_self();
1000
1001         thread->index = 0;
1002
1003         /* TODO destroy all those things */
1004         pthread_mutex_init(&(thread->joinmutex), NULL);
1005         pthread_cond_init(&(thread->joincond), NULL);
1006
1007         pthread_mutex_init(&(thread->waitmutex), NULL);
1008         pthread_cond_init(&(thread->waitcond), NULL);
1009
1010         thread->interrupted = false;
1011         thread->signaled = false;
1012         thread->sleeping = false;
1013 }
1014
1015
1016 /* threads_startup_thread ******************************************************
1017
1018    Thread startup function called by pthread_create.
1019
1020    Thread which have a startup.function != NULL are marked as internal
1021    threads. All other threads are threated as normal Java threads.
1022
1023    NOTE: This function is not called directly by pthread_create. The Boehm GC
1024          inserts its own GC_start_routine in between, which then calls
1025                  threads_startup.
1026
1027    IN:
1028       t............the argument passed to pthread_create, ie. a pointer to
1029                        a startupinfo struct. CAUTION: When the `psem` semaphore
1030                                    is posted, the startupinfo struct becomes invalid! (It
1031                                    is allocated on the stack of threads_start_thread.)
1032
1033 ******************************************************************************/
1034
1035 static void *threads_startup_thread(void *t)
1036 {
1037         startupinfo  *startup;
1038         threadobject *thread;
1039         sem_t        *psem;
1040         threadobject *tnext;
1041         methodinfo   *method;
1042         functionptr   function;
1043
1044 #if defined(ENABLE_INTRP)
1045         u1 *intrp_thread_stack;
1046
1047         /* create interpreter stack */
1048
1049         if (opt_intrp) {
1050                 intrp_thread_stack = GCMNEW(u1, opt_stacksize);
1051                 MSET(intrp_thread_stack, 0, u1, opt_stacksize);
1052         }
1053         else
1054                 intrp_thread_stack = NULL;
1055 #endif
1056
1057         /* get passed startupinfo structure and the values in there */
1058
1059         startup = t;
1060         t = NULL; /* make sure it's not used wrongly */
1061
1062         thread   = startup->thread;
1063         function = startup->function;
1064         psem     = startup->psem;
1065
1066         /* Seems like we've encountered a situation where thread->tid was not set by
1067          * pthread_create. We alleviate this problem by waiting for pthread_create
1068          * to return. */
1069         threads_sem_wait(startup->psem_first);
1070
1071         /* set the thread object */
1072
1073 #if defined(__DARWIN__)
1074         thread->mach_thread = mach_thread_self();
1075 #endif
1076         threads_set_current_threadobject(thread);
1077
1078         /* insert the thread into the threadlist and the threads table */
1079
1080         pthread_mutex_lock(&threadlistlock);
1081
1082         thread->prev = mainthreadobj;
1083         thread->next = tnext = mainthreadobj->next;
1084         mainthreadobj->next = thread;
1085         tnext->prev = thread;
1086
1087         threads_table_add(thread);
1088
1089         pthread_mutex_unlock(&threadlistlock);
1090
1091         /* init data structures of this thread */
1092
1093         lock_init_execution_env(thread);
1094
1095         /* tell threads_startup_thread that we registered ourselves */
1096         /* CAUTION: *startup becomes invalid with this!             */
1097
1098         startup = NULL;
1099         threads_sem_post(psem);
1100
1101         /* set our priority */
1102
1103         threads_set_thread_priority(thread->tid, thread->o.thread->priority);
1104
1105 #if defined(ENABLE_INTRP)
1106         /* set interpreter stack */
1107
1108         if (opt_intrp)
1109                 thread->_global_sp = (void *) (intrp_thread_stack + opt_stacksize);
1110 #endif
1111
1112 #if defined(ENABLE_JVMTI)
1113         /* fire thread start event */
1114
1115         if (jvmti)
1116                 jvmti_ThreadStartEnd(JVMTI_EVENT_THREAD_START);
1117 #endif
1118
1119         /* find and run the Thread.run()V method if no other function was passed */
1120
1121         if (function == NULL) {
1122                 /* this is a normal Java thread */
1123
1124                 thread->flags |= THREAD_FLAG_JAVA;
1125
1126                 method = class_resolveclassmethod(thread->o.header.vftbl->class,
1127                                                                                   utf_run,
1128                                                                                   utf_void__void,
1129                                                                                   thread->o.header.vftbl->class,
1130                                                                                   true);
1131
1132                 if (method == NULL)
1133                         throw_exception();
1134
1135                 /* increase total started thread count */
1136
1137                 _Jv_jvm->total_started_thread_count++;
1138
1139                 (void) vm_call_method(method, (java_objectheader *) thread);
1140         }
1141         else {
1142                 /* this is an internal thread */
1143
1144                 thread->flags |= THREAD_FLAG_INTERNAL;
1145
1146                 /* increase total started thread count */
1147
1148                 _Jv_jvm->total_started_thread_count++;
1149
1150                 /* call passed function, e.g. finalizer_thread */
1151
1152                 (function)();
1153         }
1154
1155 #if defined(ENABLE_JVMTI)
1156         /* fire thread end event */
1157
1158         if (jvmti)
1159                 jvmti_ThreadStartEnd(JVMTI_EVENT_THREAD_END);
1160 #endif
1161
1162         threads_detach_thread(thread);
1163
1164         return NULL;
1165 }
1166
1167
1168 /* threads_start_thread ********************************************************
1169
1170    Start a thread in the JVM.
1171
1172    IN:
1173       t............the java.lang.Thread object
1174           function.....function to run in the new thread. NULL means that the
1175                        "run" method of the object `t` should be called
1176
1177 ******************************************************************************/
1178
1179 void threads_start_thread(java_lang_Thread *t, functionptr function)
1180 {
1181         sem_t          sem;
1182         sem_t          sem_first;
1183         pthread_attr_t attr;
1184         startupinfo    startup;
1185         threadobject  *thread;
1186
1187         thread = (threadobject *) t->vmThread;
1188
1189         /* fill startupinfo structure passed by pthread_create to
1190          * threads_startup_thread */
1191
1192         startup.thread     = thread;
1193         startup.function   = function;       /* maybe we don't call Thread.run()V */
1194         startup.psem       = &sem;
1195         startup.psem_first = &sem_first;
1196
1197         threads_sem_init(&sem, 0, 0);
1198         threads_sem_init(&sem_first, 0, 0);
1199
1200         /* initialize thread attribute object */
1201
1202         if (pthread_attr_init(&attr))
1203                 vm_abort("pthread_attr_init failed: %s", strerror(errno));
1204
1205         /* initialize thread stacksize */
1206
1207         if (pthread_attr_setstacksize(&attr, opt_stacksize))
1208                 vm_abort("pthread_attr_setstacksize failed: %s", strerror(errno));
1209
1210         /* create the thread */
1211
1212         if (pthread_create(&thread->tid, &attr, threads_startup_thread, &startup))
1213                 vm_abort("pthread_create failed: %s", strerror(errno));
1214
1215         /* signal that pthread_create has returned, so thread->tid is valid */
1216
1217         threads_sem_post(&sem_first);
1218
1219         /* wait here until the thread has entered itself into the thread list */
1220
1221         threads_sem_wait(&sem);
1222
1223         /* cleanup */
1224
1225         sem_destroy(&sem);
1226         sem_destroy(&sem_first);
1227 }
1228
1229
1230 /* threads_attach_current_thread ***********************************************
1231
1232    Attaches the current thread to the VM.  Used in JNI.
1233
1234 *******************************************************************************/
1235
1236 bool threads_attach_current_thread(JavaVMAttachArgs *vm_aargs, bool isdaemon)
1237 {
1238         threadobject          *thread;
1239         java_lang_Thread      *t;
1240         utf                   *u;
1241         java_lang_String      *s;
1242         java_lang_ThreadGroup *group;
1243         java_objectheader     *o;
1244
1245         /* create a java.lang.VMThread object */
1246
1247         thread = (threadobject *) builtin_new(class_java_lang_VMThread);
1248
1249         if (thread == NULL)
1250                 return false;
1251
1252         threads_init_threadobject(&thread->o);
1253         threads_set_current_threadobject(thread);
1254         lock_init_execution_env(thread);
1255
1256         /* insert the thread into the threadlist and the threads table */
1257
1258         pthread_mutex_lock(&threadlistlock);
1259
1260         thread->prev        = mainthreadobj;
1261         thread->next        = mainthreadobj->next;
1262         mainthreadobj->next = thread;
1263         thread->next->prev  = thread;
1264
1265         threads_table_add(thread);
1266
1267         pthread_mutex_unlock(&threadlistlock);
1268
1269         /* mark main thread as Java thread */
1270
1271         thread->flags = THREAD_FLAG_JAVA;
1272
1273 #if defined(ENABLE_INTRP)
1274         /* create interpreter stack */
1275
1276         if (opt_intrp) {
1277                 MSET(intrp_main_stack, 0, u1, opt_stacksize);
1278                 thread->_global_sp = intrp_main_stack + opt_stacksize;
1279         }
1280 #endif
1281
1282         /* create a java.lang.Thread object */
1283
1284         t = (java_lang_Thread *) builtin_new(class_java_lang_Thread);
1285
1286         if (t == NULL)
1287                 return false;
1288
1289         thread->o.thread = t;
1290
1291         if (vm_aargs != NULL) {
1292                 u     = utf_new_char(vm_aargs->name);
1293                 group = (java_lang_ThreadGroup *) vm_aargs->group;
1294         }
1295         else {
1296                 u     = utf_null;
1297                 group = mainthreadobj->o.thread->group;
1298         }
1299
1300         s = javastring_new(u);
1301
1302         o = (java_objectheader *) t;
1303
1304         (void) vm_call_method(method_thread_init, o, thread, s, NORM_PRIORITY,
1305                                                   isdaemon);
1306
1307         if (*exceptionptr)
1308                 return false;
1309
1310         /* store the thread group in the object */
1311
1312         t->group = group;
1313
1314         o = (java_objectheader *) group;
1315
1316         (void) vm_call_method(method_threadgroup_add, o, t);
1317
1318         if (*exceptionptr)
1319                 return false;
1320
1321         return true;
1322 }
1323
1324
1325 /* threads_detach_thread *******************************************************
1326
1327    Detaches the passed thread from the VM.  Used in JNI.
1328
1329 *******************************************************************************/
1330
1331 bool threads_detach_thread(threadobject *thread)
1332 {
1333         java_lang_Thread      *t;
1334         java_lang_ThreadGroup *group;
1335         methodinfo            *m;
1336         java_objectheader     *o;
1337
1338         /* Allow lock record pools to be used by other threads. They
1339            cannot be deleted so we'd better not waste them. */
1340
1341         /* XXX We have to find a new way to free lock records */
1342         /*     with the new locking algorithm.                */
1343         /* lock_record_free_pools(thread->ee.lockrecordpools); */
1344
1345         /* XXX implement uncaught exception stuff (like JamVM does) */
1346
1347         /* remove thread from the thread group */
1348
1349         t     = thread->o.thread;
1350         group = t->group;
1351
1352         /* XXX TWISTI: should all threads be in a ThreadGroup? */
1353
1354         if (group != NULL) {
1355                 m = class_resolveclassmethod(group->header.vftbl->class,
1356                                                                          utf_removeThread,
1357                                                                          utf_java_lang_Thread__V,
1358                                                                          class_java_lang_ThreadGroup,
1359                                                                          true);
1360
1361                 if (m == NULL)
1362                         return false;
1363
1364                 o = (java_objectheader *) group;
1365
1366                 (void) vm_call_method(m, o, t);
1367
1368                 if (*exceptionptr)
1369                         return false;
1370         }
1371
1372         /* remove thread from thread list and threads table, do this
1373            inside a lock */
1374
1375         pthread_mutex_lock(&threadlistlock);
1376
1377         thread->next->prev = thread->prev;
1378         thread->prev->next = thread->next;
1379
1380         threads_table_remove(thread);
1381
1382         pthread_mutex_unlock(&threadlistlock);
1383
1384         /* reset thread id (lock on joinmutex? TWISTI) */
1385
1386         pthread_mutex_lock(&thread->joinmutex);
1387         thread->tid = 0;
1388         pthread_mutex_unlock(&thread->joinmutex);
1389
1390         /* tell everyone that a thread has finished */
1391
1392         pthread_cond_broadcast(&thread->joincond);
1393
1394         return true;
1395 }
1396
1397
1398 /* threads_find_non_daemon_thread **********************************************
1399
1400    Helper function used by threads_join_all_threads for finding
1401    non-daemon threads that are still running.
1402
1403 *******************************************************************************/
1404
1405 /* At the end of the program, we wait for all running non-daemon
1406    threads to die. */
1407
1408 static threadobject *threads_find_non_daemon_thread(threadobject *thread)
1409 {
1410         while (thread != mainthreadobj) {
1411                 if (!thread->o.thread->daemon)
1412                         return thread;
1413                 thread = thread->prev;
1414         }
1415
1416         return NULL;
1417 }
1418
1419
1420 /* threads_join_all_threads ****************************************************
1421
1422    Join all non-daemon threads.
1423
1424 *******************************************************************************/
1425
1426 void threads_join_all_threads(void)
1427 {
1428         threadobject *thread;
1429
1430         pthread_mutex_lock(&threadlistlock);
1431
1432         while ((thread = threads_find_non_daemon_thread(mainthreadobj->prev)) != NULL) {
1433
1434                 pthread_mutex_lock(&thread->joinmutex);
1435
1436                 pthread_mutex_unlock(&threadlistlock);
1437
1438                 while (thread->tid)
1439                         pthread_cond_wait(&thread->joincond, &thread->joinmutex);
1440
1441                 pthread_mutex_unlock(&thread->joinmutex);
1442
1443                 pthread_mutex_lock(&threadlistlock);
1444         }
1445
1446         pthread_mutex_unlock(&threadlistlock);
1447 }
1448
1449
1450 /* threads_timespec_earlier ****************************************************
1451
1452    Return true if timespec tv1 is earlier than timespec tv2.
1453
1454    IN:
1455       tv1..........first timespec
1456           tv2..........second timespec
1457
1458    RETURN VALUE:
1459       true, if the first timespec is earlier
1460
1461 *******************************************************************************/
1462
1463 static inline bool threads_timespec_earlier(const struct timespec *tv1,
1464                                                                                         const struct timespec *tv2)
1465 {
1466         return (tv1->tv_sec < tv2->tv_sec)
1467                                 ||
1468                 (tv1->tv_sec == tv2->tv_sec && tv1->tv_nsec < tv2->tv_nsec);
1469 }
1470
1471
1472 /* threads_current_time_is_earlier_than ****************************************
1473
1474    Check if the current time is earlier than the given timespec.
1475
1476    IN:
1477       tv...........the timespec to compare against
1478
1479    RETURN VALUE:
1480       true, if the current time is earlier
1481
1482 *******************************************************************************/
1483
1484 static bool threads_current_time_is_earlier_than(const struct timespec *tv)
1485 {
1486         struct timeval tvnow;
1487         struct timespec tsnow;
1488
1489         /* get current time */
1490
1491         if (gettimeofday(&tvnow, NULL) != 0)
1492                 vm_abort("gettimeofday failed: %s\n", strerror(errno));
1493
1494         /* convert it to a timespec */
1495
1496         tsnow.tv_sec = tvnow.tv_sec;
1497         tsnow.tv_nsec = tvnow.tv_usec * 1000;
1498
1499         /* compare current time with the given timespec */
1500
1501         return threads_timespec_earlier(&tsnow, tv);
1502 }
1503
1504
1505 /* threads_wait_with_timeout ***************************************************
1506
1507    Wait until the given point in time on a monitor until either
1508    we are notified, we are interrupted, or the time is up.
1509
1510    IN:
1511       t............the current thread
1512           wakeupTime...absolute (latest) wakeup time
1513                            If both tv_sec and tv_nsec are zero, this function
1514                                            waits for an unlimited amount of time.
1515
1516    RETURN VALUE:
1517       true.........if the wait has been interrupted,
1518           false........if the wait was ended by notification or timeout
1519
1520 *******************************************************************************/
1521
1522 static bool threads_wait_with_timeout(threadobject *t,
1523                                                                           struct timespec *wakeupTime)
1524 {
1525         bool wasinterrupted;
1526
1527         /* acquire the waitmutex */
1528
1529         pthread_mutex_lock(&t->waitmutex);
1530
1531         /* mark us as sleeping */
1532
1533         t->sleeping = true;
1534
1535         /* wait on waitcond */
1536
1537         if (wakeupTime->tv_sec || wakeupTime->tv_nsec) {
1538                 /* with timeout */
1539                 while (!t->interrupted && !t->signaled
1540                            && threads_current_time_is_earlier_than(wakeupTime))
1541                 {
1542                         pthread_cond_timedwait(&t->waitcond, &t->waitmutex, wakeupTime);
1543                 }
1544         }
1545         else {
1546                 /* no timeout */
1547                 while (!t->interrupted && !t->signaled)
1548                         pthread_cond_wait(&t->waitcond, &t->waitmutex);
1549         }
1550
1551         /* check if we were interrupted */
1552
1553         wasinterrupted = t->interrupted;
1554
1555         /* reset all flags */
1556
1557         t->interrupted = false;
1558         t->signaled = false;
1559         t->sleeping = false;
1560
1561         /* release the waitmutex */
1562
1563         pthread_mutex_unlock(&t->waitmutex);
1564
1565         return wasinterrupted;
1566 }
1567
1568
1569 /* threads_wait_with_timeout_relative ******************************************
1570
1571    Wait for the given maximum amount of time on a monitor until either
1572    we are notified, we are interrupted, or the time is up.
1573
1574    IN:
1575       t............the current thread
1576           millis.......milliseconds to wait
1577           nanos........nanoseconds to wait
1578
1579    RETURN VALUE:
1580       true.........if the wait has been interrupted,
1581           false........if the wait was ended by notification or timeout
1582
1583 *******************************************************************************/
1584
1585 bool threads_wait_with_timeout_relative(threadobject *t,
1586                                                                                 s8 millis,
1587                                                                                 s4 nanos)
1588 {
1589         struct timespec wakeupTime;
1590
1591         /* calculate the the (latest) wakeup time */
1592
1593         threads_calc_absolute_time(&wakeupTime, millis, nanos);
1594
1595         /* wait */
1596
1597         return threads_wait_with_timeout(t, &wakeupTime);
1598 }
1599
1600
1601 /* threads_calc_absolute_time **************************************************
1602
1603    Calculate the absolute point in time a given number of ms and ns from now.
1604
1605    IN:
1606       millis............milliseconds from now
1607           nanos.............nanoseconds from now
1608
1609    OUT:
1610       *tm...............receives the timespec of the absolute point in time
1611
1612 *******************************************************************************/
1613
1614 static void threads_calc_absolute_time(struct timespec *tm, s8 millis, s4 nanos)
1615 {
1616         if ((millis != 0x7fffffffffffffffLLU) && (millis || nanos)) {
1617                 struct timeval tv;
1618                 long nsec;
1619                 gettimeofday(&tv, NULL);
1620                 tv.tv_sec += millis / 1000;
1621                 millis %= 1000;
1622                 nsec = tv.tv_usec * 1000 + (s4) millis * 1000000 + nanos;
1623                 tm->tv_sec = tv.tv_sec + nsec / 1000000000;
1624                 tm->tv_nsec = nsec % 1000000000;
1625         }
1626         else {
1627                 tm->tv_sec = 0;
1628                 tm->tv_nsec = 0;
1629         }
1630 }
1631
1632
1633 /* threads_interrupt_thread ****************************************************
1634
1635    Interrupt the given thread.
1636
1637    The thread gets the "waitcond" signal and
1638    its interrupted flag is set to true.
1639
1640    IN:
1641       thread............the thread to interrupt
1642
1643 *******************************************************************************/
1644
1645 void threads_interrupt_thread(java_lang_VMThread *thread)
1646 {
1647         threadobject *t = (threadobject*) thread;
1648
1649         /* signal the thread a "waitcond" and tell it that it has been */
1650         /* interrupted                                                 */
1651
1652         pthread_mutex_lock(&t->waitmutex);
1653         if (t->sleeping)
1654                 pthread_cond_signal(&t->waitcond);
1655         t->interrupted = true;
1656         pthread_mutex_unlock(&t->waitmutex);
1657 }
1658
1659
1660 /* threads_check_if_interrupted_and_reset **************************************
1661
1662    Check if the current thread has been interrupted and reset the
1663    interruption flag.
1664
1665    RETURN VALUE:
1666       true, if the current thread had been interrupted
1667
1668 *******************************************************************************/
1669
1670 bool threads_check_if_interrupted_and_reset(void)
1671 {
1672         threadobject *t;
1673         bool intr;
1674
1675         t = (threadobject*) THREADOBJECT;
1676
1677         intr = t->interrupted;
1678
1679         t->interrupted = false;
1680
1681         return intr;
1682 }
1683
1684
1685 /* threads_thread_has_been_interrupted *********************************************************
1686
1687    Check if the given thread has been interrupted
1688
1689    IN:
1690       t............the thread to check
1691
1692    RETURN VALUE:
1693       true, if the given thread had been interrupted
1694
1695 *******************************************************************************/
1696
1697 bool threads_thread_has_been_interrupted(java_lang_VMThread *thread)
1698 {
1699         threadobject *t;
1700
1701         t = (threadobject*) thread;
1702
1703         return t->interrupted;
1704 }
1705
1706
1707 /* threads_sleep ***************************************************************
1708
1709    Sleep the current thread for the specified amount of time.
1710
1711 *******************************************************************************/
1712
1713 void threads_sleep(s8 millis, s4 nanos)
1714 {
1715         threadobject       *t;
1716         struct timespec    wakeupTime;
1717         bool               wasinterrupted;
1718
1719         t = (threadobject *) THREADOBJECT;
1720
1721         threads_calc_absolute_time(&wakeupTime, millis, nanos);
1722
1723         wasinterrupted = threads_wait_with_timeout(t, &wakeupTime);
1724
1725         if (wasinterrupted)
1726                 *exceptionptr = new_exception(string_java_lang_InterruptedException);
1727 }
1728
1729
1730 /* threads_yield *****************************************************************
1731
1732    Yield to the scheduler.
1733
1734 *******************************************************************************/
1735
1736 void threads_yield(void)
1737 {
1738         sched_yield();
1739 }
1740
1741
1742 /* threads_java_lang_Thread_set_priority ***********************************************************
1743
1744    Set the priority for the given java.lang.Thread.
1745
1746    IN:
1747       t............the java.lang.Thread
1748           priority.....the priority
1749
1750 *******************************************************************************/
1751
1752 void threads_java_lang_Thread_set_priority(java_lang_Thread *t, s4 priority)
1753 {
1754         threadobject *thread;
1755
1756         thread = (threadobject*) t->vmThread;
1757
1758         threads_set_thread_priority(thread->tid, priority);
1759 }
1760
1761
1762 /* threads_dump ****************************************************************
1763
1764    Dumps info for all threads running in the JVM. This function is
1765    called when SIGQUIT (<ctrl>-\) is sent to CACAO.
1766
1767 *******************************************************************************/
1768
1769 void threads_dump(void)
1770 {
1771         threadobject       *tobj;
1772         java_lang_VMThread *vmt;
1773         java_lang_Thread   *t;
1774         utf                *name;
1775
1776         tobj = mainthreadobj;
1777
1778         printf("Full thread dump CACAO "VERSION":\n");
1779
1780         /* iterate over all started threads */
1781
1782         do {
1783                 /* get thread objects */
1784
1785                 vmt = &tobj->o;
1786                 t   = vmt->thread;
1787
1788                 /* the thread may be currently in initalization, don't print it */
1789
1790                 if (t) {
1791                         /* get thread name */
1792
1793                         name = javastring_toutf(t->name, false);
1794
1795                         printf("\n\"");
1796                         utf_display_printable_ascii(name);
1797                         printf("\" ");
1798
1799                         if (t->daemon)
1800                                 printf("daemon ");
1801
1802 #if SIZEOF_VOID_P == 8
1803                         printf("prio=%d tid=0x%016lx\n", t->priority, tobj->tid);
1804 #else
1805                         printf("prio=%d tid=0x%08lx\n", t->priority, tobj->tid);
1806 #endif
1807
1808                         /* send SIGUSR1 to thread to print stacktrace */
1809
1810                         pthread_kill(tobj->tid, SIGUSR1);
1811
1812                         /* sleep this thread a bit, so the signal can reach the thread */
1813
1814                         threads_sleep(10, 0);
1815                 }
1816
1817                 tobj = tobj->next;
1818         } while (tobj && (tobj != mainthreadobj));
1819 }
1820
1821
1822 /* threads_table_dump *********************************************************
1823
1824    Dump the threads table for debugging purposes.
1825
1826    IN:
1827       file..............stream to write to
1828
1829 ******************************************************************************/
1830
1831 #if !defined(NDEBUG)
1832 static void threads_table_dump(FILE *file)
1833 {
1834         s4 i;
1835         s4 size;
1836         ptrint index;
1837
1838         pthread_mutex_lock(&threadlistlock);
1839
1840         size = threads_table.size;
1841
1842         fprintf(file, "======== THREADS TABLE (size %d) ========\n", size);
1843
1844         for (i=0; i<size; ++i) {
1845                 index = threads_table.table[i].nextfree;
1846
1847                 fprintf(file, "%4d: ", i);
1848
1849                 if (index < size) {
1850                         fprintf(file, "free, nextfree = %d\n", index);
1851                 }
1852                 else {
1853                         fprintf(file, "thread %p\n", (void*) threads_table.table[i].thread);
1854                 }
1855         }
1856
1857         fprintf(file, "======== END OF THREADS TABLE ========\n");
1858
1859         pthread_mutex_unlock(&threadlistlock);
1860 }
1861 #endif
1862
1863 /*
1864  * These are local overrides for various environment variables in Emacs.
1865  * Please do not remove this and leave it at the end of the file, where
1866  * Emacs will automagically detect them.
1867  * ---------------------------------------------------------------------
1868  * Local variables:
1869  * mode: c
1870  * indent-tabs-mode: t
1871  * c-basic-offset: 4
1872  * tab-width: 4
1873  * End:
1874  * vim:noexpandtab:sw=4:ts=4:
1875  */