src/threads/thread.cpp

   1 /* src/threads/thread.cpp - machine independent thread functions
   2
   3    Copyright (C) 1996-2011
   4    CACAOVM - Verein zur Foerderung der freien virtuellen Maschine CACAO
   5
   6    This file is part of CACAO.
   7
   8    This program is free software; you can redistribute it and/or
   9    modify it under the terms of the GNU General Public License as
  10    published by the Free Software Foundation; either version 2, or (at
  11    your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful, but
  14    WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16    General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  21    02110-1301, USA.
  22
  23 */
  24
  25
  26 #include "config.h"
  27
  28 #include <assert.h>
  29 #include <stdint.h>
  30 #include <unistd.h>
  31
  32 #include "vm/types.h"
  33
  34 #include "mm/memory.hpp"
  35
  36 #if defined(ENABLE_GC_BOEHM)
  37 /* We need to include Boehm's gc.h here for GC_register_my_thread and
  38    friends. */
  39 # include "mm/boehm-gc/include/gc.h"
  40 #endif
  41
  42 #include "native/llni.h"
  43 #include "native/native.hpp"
  44
  45 #include "threads/lock.hpp"
  46 #include "threads/threadlist.hpp"
  47 #include "threads/thread.hpp"
  48
  49 #include "vm/jit/builtin.hpp"
  50 #include "vm/class.hpp"
  51 #include "vm/exceptions.hpp"
  52 #include "vm/finalizer.hpp"
  53 #include "vm/globals.hpp"
  54 #include "vm/javaobjects.hpp"
  55 #include "vm/method.hpp"
  56 #include "vm/options.h"
  57 #include "vm/string.hpp"
  58 #include "vm/utf8.h"
  59 #include "vm/vm.hpp"
  60
  61 #if defined(ENABLE_STATISTICS)
  62 # include "vm/statistics.h"
  63 #endif
  64
  65 #include "vm/jit/stacktrace.hpp"
  66
  67
  68 /* global variables ***********************************************************/
  69
  70 static methodinfo    *thread_method_init;
  71 static java_handle_t *threadgroup_system;
  72 static java_handle_t *threadgroup_main;
  73
  74 #if defined(__LINUX__)
  75 /* XXX Remove for exact-GC. */
  76 bool threads_pthreads_implementation_nptl;
  77 #endif
  78
  79
  80 /* static functions ***********************************************************/
  81
  82 static void          thread_create_initial_thread(void);
  83 static threadobject *thread_new(int32_t flags);
  84
  85
  86 /* threads_preinit *************************************************************
  87
  88    Do some early initialization of stuff required.
  89
  90 *******************************************************************************/
  91
  92 void threads_preinit(void)
  93 {
  94         threadobject *mainthread;
  95 #if defined(__LINUX__) && defined(_CS_GNU_LIBPTHREAD_VERSION)
  96         char         *pathbuf;
  97         size_t        len;
  98 #endif
  99
 100         TRACESUBSYSTEMINITIALIZATION("threads_preinit");
 101
 102 #if defined(__LINUX__)
 103         /* XXX Remove for exact-GC. */
 104
 105         /* On Linux we need to check the pthread implementation. */
 106
 107         /* _CS_GNU_LIBPTHREAD_VERSION (GNU C library only; since glibc 2.3.2) */
 108         /* If the glibc is a pre-2.3.2 version, we fall back to
 109            linuxthreads. */
 110
 111 # if defined(_CS_GNU_LIBPTHREAD_VERSION)
 112         len = confstr(_CS_GNU_LIBPTHREAD_VERSION, NULL, (size_t) 0);
 113
 114         /* Some systems return as length 0 (maybe cross-compilation
 115            related).  In this case we also fall back to linuxthreads. */
 116
 117         if (len > 0) {
 118                 pathbuf = MNEW(char, len);
 119
 120                 (void) confstr(_CS_GNU_LIBPTHREAD_VERSION, pathbuf, len);
 121
 122                 if (strstr(pathbuf, "NPTL") != NULL)
 123                         threads_pthreads_implementation_nptl = true;
 124                 else
 125                         threads_pthreads_implementation_nptl = false;
 126         }
 127         else
 128                 threads_pthreads_implementation_nptl = false;
 129 # else
 130         threads_pthreads_implementation_nptl = false;
 131 # endif
 132 #endif
 133
 134         /* Initialize the threads implementation (sets the thinlock on the
 135            main thread). */
 136
 137         threads_impl_preinit();
 138
 139         /* Create internal thread data-structure for the main thread. */
 140
 141         mainthread = thread_new(THREAD_FLAG_JAVA);
 142
 143         /* Add the thread to the thread list. */
 144
 145         ThreadList::add_to_active_thread_list(mainthread);
 146
 147         /* The main thread should always have index 1. */
 148
 149         if (mainthread->index != 1)
 150                 vm_abort("threads_preinit: main thread index not 1: %d != 1",
 151                                  mainthread->index);
 152
 153         /* Thread is already running. */
 154
 155         mainthread->state = THREAD_STATE_RUNNABLE;
 156
 157         /* Store the internal thread data-structure in the TSD. */
 158
 159         thread_set_current(mainthread);
 160 }
 161
 162
 163 /* threads_init ****************************************************************
 164
 165    Initialize the main thread.
 166
 167 *******************************************************************************/
 168
 169 void threads_init(void)
 170 {
 171         TRACESUBSYSTEMINITIALIZATION("threads_init");
 172
 173         /* Create the system and main thread groups. */
 174
 175         ThreadRuntime::thread_create_initial_threadgroups(&threadgroup_main, &threadgroup_system);
 176
 177         /* Cache the java.lang.Thread initialization method. */
 178
 179         thread_method_init = ThreadRuntime::get_thread_init_method();
 180
 181         if (thread_method_init == NULL)
 182                 vm_abort("threads_init: failed to resolve thread init method");
 183
 184         thread_create_initial_thread();
 185 }
 186
 187
 188 /* thread_create_object ********************************************************
 189
 190    Create a Java thread object for the given thread data-structure,
 191    initializes it and adds the thread to the threadgroup.
 192
 193    ARGUMENTS:
 194
 195        t ....... thread
 196        name .... thread name
 197        group ... threadgroup
 198
 199    RETURN:
 200
 201 *******************************************************************************/
 202
 203 static bool thread_create_object(threadobject *t, java_handle_t *name, java_handle_t *group)
 204 {
 205         /* Create a java.lang.Thread Java object. */
 206
 207         java_handle_t* h = builtin_new(class_java_lang_Thread);
 208
 209         if (h == NULL)
 210                 return false;
 211
 212         java_lang_Thread jlt(h);
 213
 214         // Set the Java object in the thread data-structure.  This
 215         // indicates that the thread is attached to the VM.
 216         t->object = LLNI_DIRECT(jlt.get_handle());
 217
 218         return ThreadRuntime::invoke_thread_initializer(jlt, t, thread_method_init, name, group);
 219 }
 220
 221
 222 /* thread_create_initial_thread ***********************************************
 223
 224    Create the initial thread: main
 225
 226 *******************************************************************************/
 227
 228 static void thread_create_initial_thread(void)
 229 {
 230         threadobject  *t;
 231         java_handle_t *name;
 232
 233         /* Get the main-thread (NOTE: The main thread is always the first
 234            thread in the list). */
 235
 236         t = ThreadList::get_main_thread();
 237
 238         /* The thread name. */
 239
 240         name = javastring_new(utf_main);
 241
 242 #if defined(ENABLE_INTRP)
 243         /* create interpreter stack */
 244
 245         if (opt_intrp) {
 246                 MSET(intrp_main_stack, 0, u1, opt_stacksize);
 247                 mainthread->_global_sp = (Cell*) (intrp_main_stack + opt_stacksize);
 248         }
 249 #endif
 250
 251         /* Create the Java thread object. */
 252
 253         if (!thread_create_object(t, name, threadgroup_main))
 254                 vm_abort("thread_create_initial_thread: failed to create Java object");
 255
 256         /* Initialize the implementation specific bits. */
 257
 258         threads_impl_init();
 259
 260         DEBUGTHREADS("starting (main)", t);
 261 }
 262
 263
 264 /* thread_new ******************************************************************
 265
 266    Allocates and initializes an internal thread data-structure and
 267    adds it to the threads list.
 268
 269 *******************************************************************************/
 270
 271 static threadobject *thread_new(int32_t flags)
 272 {
 273         int32_t       index;
 274         threadobject *t;
 275
 276         /* Lock the thread lists */
 277
 278         ThreadList::lock();
 279
 280         index = ThreadList::get_free_thread_index();
 281
 282         /* Allocate a thread data structure. */
 283
 284         /* First, try to get one from the free-list. */
 285
 286         t = ThreadList::get_free_thread();
 287
 288         /* Unlock the thread lists. */
 289
 290         ThreadList::unlock();
 291
 292         if (t != NULL) {
 293                 /* Equivalent of MZERO on the else path */
 294
 295                 threads_impl_thread_clear(t);
 296         }
 297         else {
 298 #if defined(ENABLE_GC_BOEHM)
 299                 t = GCNEW_UNCOLLECTABLE(threadobject, 1);
 300 #else
 301                 t = NEW(threadobject);
 302 #endif
 303
 304 #if defined(ENABLE_STATISTICS)
 305                 if (opt_stat)
 306                         size_threadobject += sizeof(threadobject);
 307 #endif
 308
 309                 /* Clear memory. */
 310
 311                 MZERO(t, threadobject, 1);
 312
 313                 // Initialize the mutex and the condition.
 314                 t->flc_lock = new Mutex();
 315                 t->flc_cond = new Condition();
 316
 317                 t->waitmutex = new Mutex();
 318                 t->waitcond = new Condition();
 319
 320                 t->suspendmutex = new Mutex();
 321                 t->suspendcond = new Condition();
 322
 323 #if defined(ENABLE_TLH)
 324                 tlh_init(&(t->tlh));
 325 #endif
 326
 327 #if defined(ENABLE_GC_CACAO)
 328                 /* Register reference to java.lang.Thread with the GC. */
 329                 /* FIXME is it ok to do this only once? */
 330
 331                 gc_reference_register(&(t->object), GC_REFTYPE_THREADOBJECT);
 332                 gc_reference_register(&(t->_exceptionptr), GC_REFTYPE_THREADOBJECT);
 333 #endif
 334
 335                 t->_dumpmemory = new DumpMemory();
 336         }
 337
 338         /* Pre-compute the thinlock-word. */
 339
 340         assert(index != 0);
 341
 342         t->index     = index;
 343         t->thinlock  = Lockword::pre_compute_thinlock(t->index);
 344         t->flags     = flags;
 345         t->state     = THREAD_STATE_NEW;
 346
 347 #if defined(ENABLE_GC_CACAO)
 348         t->flags    |= THREAD_FLAG_IN_NATIVE;
 349 #endif
 350
 351         /* Initialize the implementation-specific bits. */
 352
 353         threads_impl_thread_reuse(t);
 354
 355         return t;
 356 }
 357
 358
 359 /* thread_free *****************************************************************
 360
 361    Remove the thread from the threads-list and free the internal
 362    thread data structure.  The thread index is added to the
 363    thread-index free-list.
 364
 365    IN:
 366        t ... thread data structure
 367
 368 *******************************************************************************/
 369
 370 void thread_free(threadobject *t)
 371 {
 372         java_handle_t *h = LLNI_WRAP(t->object);
 373         java_lang_Thread jlt(h);
 374         ThreadRuntime::clear_heap_reference(jlt);
 375
 376         /* Set the reference to the Java object to NULL. */
 377
 378         t->object = 0;
 379
 380         ThreadList::deactivate_thread(t);
 381 }
 382
 383
 384 /* threads_thread_start_internal ***********************************************
 385
 386    Start an internal thread in the JVM.  No Java thread objects exists
 387    so far.
 388
 389    IN:
 390       name.......UTF-8 name of the thread
 391       f..........function pointer to C function to start
 392
 393 *******************************************************************************/
 394
 395 static void thread_cleanup_finalizer(java_handle_t *h, void *data)
 396 {
 397         threadobject *t = reinterpret_cast<threadobject*>(data);
 398         ThreadList::release_thread(t, false);
 399 }
 400
 401 bool threads_thread_start_internal(utf *name, functionptr f)
 402 {
 403         threadobject *t;
 404
 405         /* Create internal thread data-structure. */
 406
 407         t = thread_new(THREAD_FLAG_INTERNAL | THREAD_FLAG_DAEMON);
 408
 409         /* Add the thread to the thread list. */
 410
 411         ThreadList::add_to_active_thread_list(t);
 412
 413         /* Create the Java thread object. */
 414
 415         if (!thread_create_object(t, javastring_new(name), threadgroup_system)) {
 416                 ThreadList::release_thread(t, true);
 417                 return false;
 418         }
 419
 420         Finalizer::attach_custom_finalizer(LLNI_WRAP(t->object), thread_cleanup_finalizer, t);
 421
 422         /* Start the thread. */
 423
 424         threads_impl_thread_start(t, f);
 425
 426         /* everything's ok */
 427
 428         return true;
 429 }
 430
 431
 432 /* threads_thread_start ********************************************************
 433
 434    Start a Java thread in the JVM.  Only the java thread object exists
 435    so far.
 436
 437    IN:
 438       object.....the java thread object java.lang.Thread
 439
 440 *******************************************************************************/
 441
 442 void threads_thread_start(java_handle_t *object)
 443 {
 444         java_lang_Thread jlt(object);
 445
 446         /* Create internal thread data-structure. */
 447
 448         u4 flags = THREAD_FLAG_JAVA;
 449 #if defined(ENABLE_JAVASE)
 450         /* Is this a daemon thread? */
 451
 452         if (jlt.get_daemon())
 453                 flags |= THREAD_FLAG_DAEMON;
 454 #endif
 455
 456         threadobject* t = thread_new(flags);
 457
 458         /* Link the two objects together. */
 459
 460         t->object = LLNI_DIRECT(object);
 461
 462         /* Add the thread to the thread list. */
 463
 464         ThreadList::add_to_active_thread_list(t);
 465
 466         Atomic::write_memory_barrier();
 467
 468         ThreadRuntime::setup_thread_vmdata(jlt, t);
 469
 470         Finalizer::attach_custom_finalizer(LLNI_WRAP(t->object), thread_cleanup_finalizer, t);
 471
 472         /* Start the thread.  Don't pass a function pointer (NULL) since
 473            we want Thread.run()V here. */
 474
 475         threads_impl_thread_start(t, NULL);
 476 }
 477
 478
 479 /**
 480  * Attaches the current thread to the VM.
 481  *
 482  * @param vm_aargs Attach arguments.
 483  * @param isdaemon true if the attached thread should be a daemon
 484  *                 thread.
 485  *
 486  * @return true on success, false otherwise.
 487  */
 488 bool thread_attach_current_thread(JavaVMAttachArgs *vm_aargs, bool isdaemon)
 489 {
 490         bool           result;
 491         threadobject  *t;
 492         utf           *u;
 493         java_handle_t *name;
 494         java_handle_t *group;
 495
 496     /* If the current thread has already been attached, this operation
 497            is a no-op. */
 498
 499         result = thread_current_is_attached();
 500
 501         if (result == true)
 502                 return true;
 503
 504         /* Create internal thread data structure. */
 505
 506         u4 flags = THREAD_FLAG_JAVA;
 507         if (isdaemon)
 508                 flags |= THREAD_FLAG_DAEMON;
 509
 510         t = thread_new(flags);
 511
 512         /* Store the internal thread data-structure in the TSD. */
 513
 514         thread_set_current(t);
 515
 516         /* The thread is flagged and (non-)daemon thread, we can leave the
 517            mutex. */
 518
 519         /* Add the thread to the thread list. */
 520
 521         ThreadList::add_to_active_thread_list(t);
 522
 523         DEBUGTHREADS("attaching", t);
 524
 525         /* Get the thread name. */
 526
 527         if (vm_aargs != NULL) {
 528                 u = utf_new_char(vm_aargs->name);
 529         }
 530         else {
 531                 u = utf_null;
 532         }
 533
 534         name = javastring_new(u);
 535
 536 #if defined(ENABLE_JAVASE)
 537         /* Get the threadgroup. */
 538
 539         if (vm_aargs != NULL)
 540                 group = (java_handle_t *) vm_aargs->group;
 541         else
 542                 group = NULL;
 543
 544         /* If no threadgroup was given, use the main threadgroup. */
 545
 546         if (group == NULL)
 547                 group = threadgroup_main;
 548 #endif
 549
 550 #if defined(ENABLE_INTRP)
 551         /* create interpreter stack */
 552
 553         if (opt_intrp) {
 554                 MSET(intrp_main_stack, 0, u1, opt_stacksize);
 555                 thread->_global_sp = (Cell *) (intrp_main_stack + opt_stacksize);
 556         }
 557 #endif
 558
 559         /* Create the Java thread object. */
 560
 561         if (!thread_create_object(t, name, group)) {
 562                 ThreadList::release_thread(t, true);
 563                 return false;
 564         }
 565
 566         /* The thread is completely initialized. */
 567
 568         thread_set_state_runnable(t);
 569
 570         return true;
 571 }
 572
 573
 574 /**
 575  * Attaches the current external thread to the VM.  This function is
 576  * called by JNI's AttachCurrentThread.
 577  *
 578  * @param vm_aargs Attach arguments.
 579  * @param isdaemon true if the attached thread should be a daemon
 580  *                 thread.
 581  *
 582  * @return true on success, false otherwise.
 583  */
 584 bool thread_attach_current_external_thread(JavaVMAttachArgs *vm_aargs, bool isdaemon)
 585 {
 586         int result;
 587
 588 #if defined(ENABLE_GC_BOEHM)
 589         struct GC_stack_base sb;
 590
 591         /* Register the thread with Boehm-GC.  This must happen before the
 592            thread allocates any memory from the GC heap.*/
 593
 594         result = GC_get_stack_base(&sb);
 595
 596         if (result != GC_SUCCESS)
 597                 vm_abort("threads_attach_current_thread: GC_get_stack_base failed");
 598
 599         GC_register_my_thread(&sb);
 600 #endif
 601
 602         result = thread_attach_current_thread(vm_aargs, isdaemon);
 603
 604         if (result == false) {
 605 #if defined(ENABLE_GC_BOEHM)
 606                 /* Unregister the thread. */
 607
 608                 GC_unregister_my_thread();
 609 #endif
 610
 611                 return false;
 612         }
 613
 614         return true;
 615 }
 616
 617
 618 /**
 619  * Detaches the current external thread from the VM.  This function is
 620  * called by JNI's DetachCurrentThread.
 621  *
 622  * @return true on success, false otherwise.
 623  */
 624 bool thread_detach_current_external_thread(void)
 625 {
 626         int result;
 627
 628         result = thread_detach_current_thread();
 629
 630         if (result == false)
 631                 return false;
 632
 633 #if defined(ENABLE_GC_BOEHM)
 634         /* Unregister the thread with Boehm-GC.  This must happen after
 635            the thread allocates any memory from the GC heap. */
 636
 637         /* Don't detach the main thread.  This is a workaround for
 638            OpenJDK's java launcher. */
 639         if (thread_get_current()->index != 1)
 640                 GC_unregister_my_thread();
 641 #endif
 642
 643         return true;
 644 }
 645
 646
 647 /* thread_fprint_name **********************************************************
 648
 649    Print the name of the given thread to the given stream.
 650
 651    ARGUMENTS:
 652        t ........ thread data-structure
 653        stream ... stream to print to
 654
 655 *******************************************************************************/
 656
 657 void thread_fprint_name(threadobject *t, FILE *stream)
 658 {
 659         if (LLNI_WRAP(t->object) == NULL)
 660                 vm_abort("");
 661
 662         java_lang_Thread jlt(LLNI_WRAP(t->object));
 663
 664         ThreadRuntime::print_thread_name(jlt, stream);
 665 }
 666
 667
 668 /* thread_print_info ***********************************************************
 669
 670    Print information of the passed thread.
 671
 672    ARGUMENTS:
 673        t ... thread data-structure.
 674
 675 *******************************************************************************/
 676
 677 void thread_print_info(threadobject *t)
 678 {
 679         java_lang_Thread jlt(LLNI_WRAP(t->object));
 680
 681         /* Print as much as we can when we are in state NEW. */
 682
 683         if (jlt.get_handle() != NULL) {
 684                 /* Print thread name. */
 685
 686                 printf("\"");
 687                 thread_fprint_name(t, stdout);
 688                 printf("\"");
 689         }
 690         else {
 691         }
 692
 693         if (thread_is_daemon(t))
 694                 printf(" daemon");
 695
 696         if (jlt.get_handle() != NULL) {
 697                 printf(" prio=%d", jlt.get_priority());
 698         }
 699
 700 #if SIZEOF_VOID_P == 8
 701         printf(" t=0x%016lx tid=0x%016lx (%ld)",
 702                    (ptrint) t, (ptrint) t->tid, (ptrint) t->tid);
 703 #else
 704         printf(" t=0x%08x tid=0x%08x (%d)",
 705                    (ptrint) t, (ptrint) t->tid, (ptrint) t->tid);
 706 #endif
 707
 708         printf(" index=%d", t->index);
 709
 710         /* Print thread state. */
 711
 712         int state = cacaothread_get_state(t);
 713
 714         switch (state) {
 715         case THREAD_STATE_NEW:
 716                 printf(" new");
 717                 break;
 718         case THREAD_STATE_RUNNABLE:
 719                 printf(" runnable");
 720                 break;
 721         case THREAD_STATE_BLOCKED:
 722                 printf(" blocked");
 723                 break;
 724         case THREAD_STATE_WAITING:
 725                 printf(" waiting");
 726                 break;
 727         case THREAD_STATE_TIMED_WAITING:
 728                 printf(" waiting on condition");
 729                 break;
 730         case THREAD_STATE_PARKED:
 731                 printf(" parked");
 732                 break;
 733         case THREAD_STATE_TIMED_PARKED:
 734                 printf(" timed parked");
 735                 break;
 736         case THREAD_STATE_TERMINATED:
 737                 printf(" terminated");
 738                 break;
 739         default:
 740                 vm_abort("thread_print_info: unknown thread state %d", state);
 741         }
 742 }
 743
 744
 745 /* threads_get_current_tid *****************************************************
 746
 747    Return the tid of the current thread.
 748
 749    RETURN VALUE:
 750        the current tid
 751
 752 *******************************************************************************/
 753
 754 intptr_t threads_get_current_tid(void)
 755 {
 756         threadobject *thread;
 757
 758         thread = THREADOBJECT;
 759
 760         /* this may happen during bootstrap */
 761
 762         if (thread == NULL)
 763                 return 0;
 764
 765         return (intptr_t) thread->tid;
 766 }
 767
 768
 769 /**
 770  * Set the current state of the given thread. This method should only
 771  * be called while holding the threadlist-lock and after checking that
 772  * the new state is valid. It is best to not call this method directly
 773  * but call the specific setter methods below.
 774  */
 775 static inline void thread_set_state(threadobject *t, int state)
 776 {
 777         // Set the state of our internal threadobject.
 778         t->state = state;
 779
 780         ThreadRuntime::set_javathread_state(t, state);
 781 }
 782
 783
 784 /* thread_set_state_runnable ***************************************************
 785
 786    Set the current state of the given thread to THREAD_STATE_RUNNABLE.
 787
 788    NOTE: If the thread has already terminated, don't set the state.
 789          This is important for threads_detach_thread.
 790
 791 *******************************************************************************/
 792
 793 void thread_set_state_runnable(threadobject *t)
 794 {
 795         if (t->state != THREAD_STATE_TERMINATED) {
 796                 thread_set_state(t, THREAD_STATE_RUNNABLE);
 797
 798                 DEBUGTHREADS("is RUNNABLE", t);
 799         }
 800 }
 801
 802
 803 /* thread_set_state_waiting ****************************************************
 804
 805    Set the current state of the given thread to THREAD_STATE_WAITING.
 806
 807    NOTE: If the thread has already terminated, don't set the state.
 808          This is important for threads_detach_thread.
 809
 810 *******************************************************************************/
 811
 812 void thread_set_state_waiting(threadobject *t)
 813 {
 814         if (t->state != THREAD_STATE_TERMINATED) {
 815                 thread_set_state(t, THREAD_STATE_WAITING);
 816
 817                 DEBUGTHREADS("is WAITING", t);
 818         }
 819 }
 820
 821
 822 /* thread_set_state_timed_waiting **********************************************
 823
 824    Set the current state of the given thread to
 825    THREAD_STATE_TIMED_WAITING.
 826
 827    NOTE: If the thread has already terminated, don't set the state.
 828          This is important for threads_detach_thread.
 829
 830 *******************************************************************************/
 831
 832 void thread_set_state_timed_waiting(threadobject *t)
 833 {
 834         if (t->state != THREAD_STATE_TERMINATED) {
 835                 thread_set_state(t, THREAD_STATE_TIMED_WAITING);
 836
 837                 DEBUGTHREADS("is TIMED_WAITING", t);
 838         }
 839 }
 840
 841
 842 /* thread_set_state_parked *****************************************************
 843
 844    Set the current state of the given thread to THREAD_STATE_PARKED.
 845
 846    NOTE: If the thread has already terminated, don't set the state.
 847          This is important for threads_detach_thread.
 848
 849 *******************************************************************************/
 850
 851 void thread_set_state_parked(threadobject *t)
 852 {
 853         if (t->state != THREAD_STATE_TERMINATED) {
 854                 thread_set_state(t, THREAD_STATE_PARKED);
 855
 856                 DEBUGTHREADS("is PARKED", t);
 857         }
 858 }
 859
 860
 861 /* thread_set_state_timed_parked ***********************************************
 862
 863    Set the current state of the given thread to THREAD_STATE_TIMED_PARKED.
 864
 865    NOTE: If the thread has already terminated, don't set the state.
 866          This is important for threads_detach_thread.
 867
 868 *******************************************************************************/
 869
 870 void thread_set_state_timed_parked(threadobject *t)
 871 {
 872         if (t->state != THREAD_STATE_TERMINATED) {
 873                 thread_set_state(t, THREAD_STATE_TIMED_PARKED);
 874
 875                 DEBUGTHREADS("is TIMED_PARKED", t);
 876         }
 877 }
 878
 879
 880 /* thread_set_state_terminated *************************************************
 881
 882    Set the current state of the given thread to
 883    THREAD_STATE_TERMINATED.
 884
 885 *******************************************************************************/
 886
 887 void thread_set_state_terminated(threadobject *t)
 888 {
 889         /* Set the state inside a lock. */
 890
 891         thread_set_state(t, THREAD_STATE_TERMINATED);
 892
 893         DEBUGTHREADS("is TERMINATED", t);
 894 }
 895
 896
 897 /* thread_get_thread **********************************************************
 898
 899    Return the thread data structure of the given Java thread object.
 900
 901    ARGUMENTS:
 902        h ... java.lang.{VM}Thread object
 903
 904    RETURN VALUE:
 905        the thread object
 906
 907    NOTE:
 908        Usage of this function without the thread list lock held is
 909        almost certainly a bug.
 910
 911 *******************************************************************************/
 912
 913 threadobject *thread_get_thread(java_handle_t *h)
 914 {
 915         return ThreadRuntime::get_threadobject_from_thread(h);
 916 }
 917
 918
 919 /* threads_thread_is_alive *****************************************************
 920
 921    Returns if the give thread is alive.
 922
 923 *******************************************************************************/
 924
 925 bool threads_thread_is_alive(threadobject *t)
 926 {
 927         int state;
 928
 929         state = cacaothread_get_state(t);
 930
 931         switch (state) {
 932         case THREAD_STATE_NEW:
 933         case THREAD_STATE_TERMINATED:
 934                 return false;
 935
 936         case THREAD_STATE_RUNNABLE:
 937         case THREAD_STATE_BLOCKED:
 938         case THREAD_STATE_WAITING:
 939         case THREAD_STATE_TIMED_WAITING:
 940         case THREAD_STATE_PARKED:
 941         case THREAD_STATE_TIMED_PARKED:
 942                 return true;
 943
 944         default:
 945                 vm_abort("threads_thread_is_alive: unknown thread state %d", state);
 946         }
 947
 948         /* keep compiler happy */
 949
 950         return false;
 951 }
 952
 953 /* thread_is_interrupted *******************************************************
 954
 955    Check if the given thread has been interrupted.
 956
 957    ARGUMENTS:
 958        t ... the thread to check
 959
 960    RETURN VALUE:
 961       true, if the given thread had been interrupted
 962
 963 *******************************************************************************/
 964
 965 bool thread_is_interrupted(threadobject *t)
 966 {
 967         /* We need the mutex because classpath will call this function when
 968            a blocking system call is interrupted. The mutex ensures that it will
 969            see the correct value for the interrupted flag. */
 970
 971         t->waitmutex->lock();
 972         bool interrupted = t->interrupted;
 973         t->waitmutex->unlock();
 974
 975         return interrupted;
 976 }
 977
 978
 979 /* thread_set_interrupted ******************************************************
 980
 981    Set the interrupted flag to the given value.
 982
 983    ARGUMENTS:
 984        interrupted ... value to set
 985
 986 *******************************************************************************/
 987
 988 void thread_set_interrupted(threadobject *t, bool interrupted)
 989 {
 990         t->waitmutex->lock();
 991         t->interrupted = interrupted;
 992         t->waitmutex->unlock();
 993 }
 994
 995 /* thread_handle_set_priority **************************************************
 996
 997    Calls threads_set_thread_priority for the threadobject associated
 998    with the thread indicated by handle th, while holding the thread
 999    list lock.
1000
1001 *******************************************************************************/
1002
1003 void thread_handle_set_priority(java_handle_t *th, int priority)
1004 {
1005         threadobject *t = thread_get_thread(th);
1006         /* For GNU classpath, this should not happen, because both
1007            setPriority() and start() are synchronized. */
1008         assert(t != 0);
1009         threads_set_thread_priority(t->tid, priority);
1010 }
1011
1012 /* thread_handle_is_interrupted ************************************************
1013
1014    Calls thread_is_interrupted for the threadobject associated with
1015    the thread indicated by handle th, while holding the thread list
1016    lock.
1017
1018 *******************************************************************************/
1019
1020 bool thread_handle_is_interrupted(java_handle_t *th)
1021 {
1022         threadobject *t = thread_get_thread(th);
1023         return t ? thread_is_interrupted(t) : false;
1024 }
1025
1026 /* thread_handle_interrupt *****************************************************
1027
1028    Calls threads_thread_interrupt for the threadobject associated with
1029    the thread indicated by handle th, while holding the thread list
1030    lock.
1031
1032 *******************************************************************************/
1033
1034 void thread_handle_interrupt(java_handle_t *th)
1035 {
1036         threadobject *t = thread_get_thread(th);
1037         /* For GNU classpath, this should not happen, because both
1038            interrupt() and start() are synchronized. */
1039         assert(t != 0);
1040         threads_thread_interrupt(t);
1041 }
1042
1043 /* thread_handle_get_state *****************************************************
1044
1045    Calls cacaothread_get_state for the threadobject associated with
1046    the thread indicated by handle th, while holding the thread list
1047    lock.
1048
1049 *******************************************************************************/
1050
1051 int thread_handle_get_state(java_handle_t *th)
1052 {
1053         threadobject *t = thread_get_thread(th);
1054         return t ? cacaothread_get_state(t) : THREAD_STATE_NEW;
1055 }
1056
1057
1058 /*
1059  * These are local overrides for various environment variables in Emacs.
1060  * Please do not remove this and leave it at the end of the file, where
1061  * Emacs will automagically detect them.
1062  * ---------------------------------------------------------------------
1063  * Local variables:
1064  * mode: c++
1065  * indent-tabs-mode: t
1066  * c-basic-offset: 4
1067  * tab-width: 4
1068  * End:
1069  * vim:noexpandtab:sw=4:ts=4:
1070  */