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         thread_set_state_runnable(t);
 473
 474         /* Start the thread.  Don't pass a function pointer (NULL) since
 475            we want Thread.run()V here. */
 476
 477         threads_impl_thread_start(t, NULL);
 478 }
 479
 480
 481 /**
 482  * Attaches the current thread to the VM.
 483  *
 484  * @param vm_aargs Attach arguments.
 485  * @param isdaemon true if the attached thread should be a daemon
 486  *                 thread.
 487  *
 488  * @return true on success, false otherwise.
 489  */
 490 bool thread_attach_current_thread(JavaVMAttachArgs *vm_aargs, bool isdaemon)
 491 {
 492         bool           result;
 493         threadobject  *t;
 494         utf           *u;
 495         java_handle_t *name;
 496         java_handle_t *group;
 497
 498     /* If the current thread has already been attached, this operation
 499            is a no-op. */
 500
 501         result = thread_current_is_attached();
 502
 503         if (result == true)
 504                 return true;
 505
 506         /* Create internal thread data structure. */
 507
 508         u4 flags = THREAD_FLAG_JAVA;
 509         if (isdaemon)
 510                 flags |= THREAD_FLAG_DAEMON;
 511
 512         t = thread_new(flags);
 513
 514         /* Store the internal thread data-structure in the TSD. */
 515
 516         thread_set_current(t);
 517
 518         /* The thread is flagged and (non-)daemon thread, we can leave the
 519            mutex. */
 520
 521         /* Add the thread to the thread list. */
 522
 523         ThreadList::add_to_active_thread_list(t);
 524
 525         DEBUGTHREADS("attaching", t);
 526
 527         /* Get the thread name. */
 528
 529         if (vm_aargs != NULL) {
 530                 u = utf_new_char(vm_aargs->name);
 531         }
 532         else {
 533                 u = utf_null;
 534         }
 535
 536         name = javastring_new(u);
 537
 538 #if defined(ENABLE_JAVASE)
 539         /* Get the threadgroup. */
 540
 541         if (vm_aargs != NULL)
 542                 group = (java_handle_t *) vm_aargs->group;
 543         else
 544                 group = NULL;
 545
 546         /* If no threadgroup was given, use the main threadgroup. */
 547
 548         if (group == NULL)
 549                 group = threadgroup_main;
 550 #endif
 551
 552 #if defined(ENABLE_INTRP)
 553         /* create interpreter stack */
 554
 555         if (opt_intrp) {
 556                 MSET(intrp_main_stack, 0, u1, opt_stacksize);
 557                 thread->_global_sp = (Cell *) (intrp_main_stack + opt_stacksize);
 558         }
 559 #endif
 560
 561         /* Create the Java thread object. */
 562
 563         if (!thread_create_object(t, name, group)) {
 564                 ThreadList::release_thread(t, true);
 565                 return false;
 566         }
 567
 568         /* The thread is completely initialized. */
 569
 570         thread_set_state_runnable(t);
 571
 572         return true;
 573 }
 574
 575
 576 /**
 577  * Attaches the current external thread to the VM.  This function is
 578  * called by JNI's AttachCurrentThread.
 579  *
 580  * @param vm_aargs Attach arguments.
 581  * @param isdaemon true if the attached thread should be a daemon
 582  *                 thread.
 583  *
 584  * @return true on success, false otherwise.
 585  */
 586 bool thread_attach_current_external_thread(JavaVMAttachArgs *vm_aargs, bool isdaemon)
 587 {
 588         int result;
 589
 590 #if defined(ENABLE_GC_BOEHM)
 591         struct GC_stack_base sb;
 592
 593         /* Register the thread with Boehm-GC.  This must happen before the
 594            thread allocates any memory from the GC heap.*/
 595
 596         result = GC_get_stack_base(&sb);
 597
 598         if (result != GC_SUCCESS)
 599                 vm_abort("threads_attach_current_thread: GC_get_stack_base failed");
 600
 601         GC_register_my_thread(&sb);
 602 #endif
 603
 604         result = thread_attach_current_thread(vm_aargs, isdaemon);
 605
 606         if (result == false) {
 607 #if defined(ENABLE_GC_BOEHM)
 608                 /* Unregister the thread. */
 609
 610                 GC_unregister_my_thread();
 611 #endif
 612
 613                 return false;
 614         }
 615
 616         return true;
 617 }
 618
 619
 620 /**
 621  * Detaches the current external thread from the VM.  This function is
 622  * called by JNI's DetachCurrentThread.
 623  *
 624  * @return true on success, false otherwise.
 625  */
 626 bool thread_detach_current_external_thread(void)
 627 {
 628         int result;
 629
 630         result = thread_detach_current_thread();
 631
 632         if (result == false)
 633                 return false;
 634
 635 #if defined(ENABLE_GC_BOEHM)
 636         /* Unregister the thread with Boehm-GC.  This must happen after
 637            the thread allocates any memory from the GC heap. */
 638
 639         /* Don't detach the main thread.  This is a workaround for
 640            OpenJDK's java launcher. */
 641         if (thread_get_current()->index != 1)
 642                 GC_unregister_my_thread();
 643 #endif
 644
 645         return true;
 646 }
 647
 648
 649 /* thread_fprint_name **********************************************************
 650
 651    Print the name of the given thread to the given stream.
 652
 653    ARGUMENTS:
 654        t ........ thread data-structure
 655        stream ... stream to print to
 656
 657 *******************************************************************************/
 658
 659 void thread_fprint_name(threadobject *t, FILE *stream)
 660 {
 661         if (LLNI_WRAP(t->object) == NULL)
 662                 vm_abort("");
 663
 664         java_lang_Thread jlt(LLNI_WRAP(t->object));
 665
 666         ThreadRuntime::print_thread_name(jlt, stream);
 667 }
 668
 669
 670 /* thread_print_info ***********************************************************
 671
 672    Print information of the passed thread.
 673
 674    ARGUMENTS:
 675        t ... thread data-structure.
 676
 677 *******************************************************************************/
 678
 679 void thread_print_info(threadobject *t)
 680 {
 681         java_lang_Thread jlt(LLNI_WRAP(t->object));
 682
 683         /* Print as much as we can when we are in state NEW. */
 684
 685         if (jlt.get_handle() != NULL) {
 686                 /* Print thread name. */
 687
 688                 printf("\"");
 689                 thread_fprint_name(t, stdout);
 690                 printf("\"");
 691         }
 692         else {
 693         }
 694
 695         if (thread_is_daemon(t))
 696                 printf(" daemon");
 697
 698         if (jlt.get_handle() != NULL) {
 699                 printf(" prio=%d", jlt.get_priority());
 700         }
 701
 702 #if SIZEOF_VOID_P == 8
 703         printf(" t=0x%016lx tid=0x%016lx (%ld)",
 704                    (ptrint) t, (ptrint) t->tid, (ptrint) t->tid);
 705 #else
 706         printf(" t=0x%08x tid=0x%08x (%d)",
 707                    (ptrint) t, (ptrint) t->tid, (ptrint) t->tid);
 708 #endif
 709
 710         printf(" index=%d", t->index);
 711
 712         /* Print thread state. */
 713
 714         int state = cacaothread_get_state(t);
 715
 716         switch (state) {
 717         case THREAD_STATE_NEW:
 718                 printf(" new");
 719                 break;
 720         case THREAD_STATE_RUNNABLE:
 721                 printf(" runnable");
 722                 break;
 723         case THREAD_STATE_BLOCKED:
 724                 printf(" blocked");
 725                 break;
 726         case THREAD_STATE_WAITING:
 727                 printf(" waiting");
 728                 break;
 729         case THREAD_STATE_TIMED_WAITING:
 730                 printf(" waiting on condition");
 731                 break;
 732         case THREAD_STATE_PARKED:
 733                 printf(" parked");
 734                 break;
 735         case THREAD_STATE_TIMED_PARKED:
 736                 printf(" timed parked");
 737                 break;
 738         case THREAD_STATE_TERMINATED:
 739                 printf(" terminated");
 740                 break;
 741         default:
 742                 vm_abort("thread_print_info: unknown thread state %d", state);
 743         }
 744 }
 745
 746
 747 /* threads_get_current_tid *****************************************************
 748
 749    Return the tid of the current thread.
 750
 751    RETURN VALUE:
 752        the current tid
 753
 754 *******************************************************************************/
 755
 756 intptr_t threads_get_current_tid(void)
 757 {
 758         threadobject *thread;
 759
 760         thread = THREADOBJECT;
 761
 762         /* this may happen during bootstrap */
 763
 764         if (thread == NULL)
 765                 return 0;
 766
 767         return (intptr_t) thread->tid;
 768 }
 769
 770
 771 /**
 772  * Set the current state of the given thread. This method should only
 773  * be called while holding the threadlist-lock and after checking that
 774  * the new state is valid. It is best to not call this method directly
 775  * but call the specific setter methods below.
 776  */
 777 static inline void thread_set_state(threadobject *t, int state)
 778 {
 779         // Set the state of our internal threadobject.
 780         t->state = state;
 781
 782         ThreadRuntime::set_javathread_state(t, state);
 783 }
 784
 785
 786 /* thread_set_state_runnable ***************************************************
 787
 788    Set the current state of the given thread to THREAD_STATE_RUNNABLE.
 789
 790    NOTE: If the thread has already terminated, don't set the state.
 791          This is important for threads_detach_thread.
 792
 793 *******************************************************************************/
 794
 795 void thread_set_state_runnable(threadobject *t)
 796 {
 797         if (t->state != THREAD_STATE_TERMINATED) {
 798                 thread_set_state(t, THREAD_STATE_RUNNABLE);
 799
 800                 DEBUGTHREADS("is RUNNABLE", t);
 801         }
 802 }
 803
 804
 805 /* thread_set_state_waiting ****************************************************
 806
 807    Set the current state of the given thread to THREAD_STATE_WAITING.
 808
 809    NOTE: If the thread has already terminated, don't set the state.
 810          This is important for threads_detach_thread.
 811
 812 *******************************************************************************/
 813
 814 void thread_set_state_waiting(threadobject *t)
 815 {
 816         if (t->state != THREAD_STATE_TERMINATED) {
 817                 thread_set_state(t, THREAD_STATE_WAITING);
 818
 819                 DEBUGTHREADS("is WAITING", t);
 820         }
 821 }
 822
 823
 824 /* thread_set_state_timed_waiting **********************************************
 825
 826    Set the current state of the given thread to
 827    THREAD_STATE_TIMED_WAITING.
 828
 829    NOTE: If the thread has already terminated, don't set the state.
 830          This is important for threads_detach_thread.
 831
 832 *******************************************************************************/
 833
 834 void thread_set_state_timed_waiting(threadobject *t)
 835 {
 836         if (t->state != THREAD_STATE_TERMINATED) {
 837                 thread_set_state(t, THREAD_STATE_TIMED_WAITING);
 838
 839                 DEBUGTHREADS("is TIMED_WAITING", t);
 840         }
 841 }
 842
 843
 844 /* thread_set_state_parked *****************************************************
 845
 846    Set the current state of the given thread to THREAD_STATE_PARKED.
 847
 848    NOTE: If the thread has already terminated, don't set the state.
 849          This is important for threads_detach_thread.
 850
 851 *******************************************************************************/
 852
 853 void thread_set_state_parked(threadobject *t)
 854 {
 855         if (t->state != THREAD_STATE_TERMINATED) {
 856                 thread_set_state(t, THREAD_STATE_PARKED);
 857
 858                 DEBUGTHREADS("is PARKED", t);
 859         }
 860 }
 861
 862
 863 /* thread_set_state_timed_parked ***********************************************
 864
 865    Set the current state of the given thread to THREAD_STATE_TIMED_PARKED.
 866
 867    NOTE: If the thread has already terminated, don't set the state.
 868          This is important for threads_detach_thread.
 869
 870 *******************************************************************************/
 871
 872 void thread_set_state_timed_parked(threadobject *t)
 873 {
 874         if (t->state != THREAD_STATE_TERMINATED) {
 875                 thread_set_state(t, THREAD_STATE_TIMED_PARKED);
 876
 877                 DEBUGTHREADS("is TIMED_PARKED", t);
 878         }
 879 }
 880
 881
 882 /* thread_set_state_terminated *************************************************
 883
 884    Set the current state of the given thread to
 885    THREAD_STATE_TERMINATED.
 886
 887 *******************************************************************************/
 888
 889 void thread_set_state_terminated(threadobject *t)
 890 {
 891         /* Set the state inside a lock. */
 892
 893         thread_set_state(t, THREAD_STATE_TERMINATED);
 894
 895         DEBUGTHREADS("is TERMINATED", t);
 896 }
 897
 898
 899 /* thread_get_thread **********************************************************
 900
 901    Return the thread data structure of the given Java thread object.
 902
 903    ARGUMENTS:
 904        h ... java.lang.{VM}Thread object
 905
 906    RETURN VALUE:
 907        the thread object
 908
 909    NOTE:
 910        Usage of this function without the thread list lock held is
 911        almost certainly a bug.
 912
 913 *******************************************************************************/
 914
 915 threadobject *thread_get_thread(java_handle_t *h)
 916 {
 917         return ThreadRuntime::get_threadobject_from_thread(h);
 918 }
 919
 920
 921 /* threads_thread_is_alive *****************************************************
 922
 923    Returns if the give thread is alive.
 924
 925 *******************************************************************************/
 926
 927 bool threads_thread_is_alive(threadobject *t)
 928 {
 929         int state;
 930
 931         state = cacaothread_get_state(t);
 932
 933         switch (state) {
 934         case THREAD_STATE_NEW:
 935         case THREAD_STATE_TERMINATED:
 936                 return false;
 937
 938         case THREAD_STATE_RUNNABLE:
 939         case THREAD_STATE_BLOCKED:
 940         case THREAD_STATE_WAITING:
 941         case THREAD_STATE_TIMED_WAITING:
 942         case THREAD_STATE_PARKED:
 943         case THREAD_STATE_TIMED_PARKED:
 944                 return true;
 945
 946         default:
 947                 vm_abort("threads_thread_is_alive: unknown thread state %d", state);
 948         }
 949
 950         /* keep compiler happy */
 951
 952         return false;
 953 }
 954
 955 /* thread_is_interrupted *******************************************************
 956
 957    Check if the given thread has been interrupted.
 958
 959    ARGUMENTS:
 960        t ... the thread to check
 961
 962    RETURN VALUE:
 963       true, if the given thread had been interrupted
 964
 965 *******************************************************************************/
 966
 967 bool thread_is_interrupted(threadobject *t)
 968 {
 969         /* We need the mutex because classpath will call this function when
 970            a blocking system call is interrupted. The mutex ensures that it will
 971            see the correct value for the interrupted flag. */
 972
 973         t->waitmutex->lock();
 974         bool interrupted = t->interrupted;
 975         t->waitmutex->unlock();
 976
 977         return interrupted;
 978 }
 979
 980
 981 /* thread_set_interrupted ******************************************************
 982
 983    Set the interrupted flag to the given value.
 984
 985    ARGUMENTS:
 986        interrupted ... value to set
 987
 988 *******************************************************************************/
 989
 990 void thread_set_interrupted(threadobject *t, bool interrupted)
 991 {
 992         t->waitmutex->lock();
 993         t->interrupted = interrupted;
 994         t->waitmutex->unlock();
 995 }
 996
 997 /* thread_handle_set_priority **************************************************
 998
 999    Calls threads_set_thread_priority for the threadobject associated
1000    with the thread indicated by handle th, while holding the thread
1001    list lock.
1002
1003 *******************************************************************************/
1004
1005 void thread_handle_set_priority(java_handle_t *th, int priority)
1006 {
1007         threadobject *t = thread_get_thread(th);
1008         /* For GNU classpath, this should not happen, because both
1009            setPriority() and start() are synchronized. */
1010         assert(t != 0);
1011         threads_set_thread_priority(t->tid, priority);
1012 }
1013
1014 /* thread_handle_is_interrupted ************************************************
1015
1016    Calls thread_is_interrupted for the threadobject associated with
1017    the thread indicated by handle th, while holding the thread list
1018    lock.
1019
1020 *******************************************************************************/
1021
1022 bool thread_handle_is_interrupted(java_handle_t *th)
1023 {
1024         threadobject *t = thread_get_thread(th);
1025         return t ? thread_is_interrupted(t) : false;
1026 }
1027
1028 /* thread_handle_interrupt *****************************************************
1029
1030    Calls threads_thread_interrupt for the threadobject associated with
1031    the thread indicated by handle th, while holding the thread list
1032    lock.
1033
1034 *******************************************************************************/
1035
1036 void thread_handle_interrupt(java_handle_t *th)
1037 {
1038         threadobject *t = thread_get_thread(th);
1039         /* For GNU classpath, this should not happen, because both
1040            interrupt() and start() are synchronized. */
1041         assert(t != 0);
1042         threads_thread_interrupt(t);
1043 }
1044
1045 /* thread_handle_get_state *****************************************************
1046
1047    Calls cacaothread_get_state for the threadobject associated with
1048    the thread indicated by handle th, while holding the thread list
1049    lock.
1050
1051 *******************************************************************************/
1052
1053 int thread_handle_get_state(java_handle_t *th)
1054 {
1055         threadobject *t = thread_get_thread(th);
1056         return t ? cacaothread_get_state(t) : THREAD_STATE_NEW;
1057 }
1058
1059
1060 /*
1061  * These are local overrides for various environment variables in Emacs.
1062  * Please do not remove this and leave it at the end of the file, where
1063  * Emacs will automagically detect them.
1064  * ---------------------------------------------------------------------
1065  * Local variables:
1066  * mode: c++
1067  * indent-tabs-mode: t
1068  * c-basic-offset: 4
1069  * tab-width: 4
1070  * End:
1071  * vim:noexpandtab:sw=4:ts=4:
1072  */