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         /* Set the reference to the Java object to NULL. */
 373
 374         t->object = 0;
 375
 376         ThreadList::deactivate_thread(t);
 377 }
 378
 379
 380 /* threads_thread_start_internal ***********************************************
 381
 382    Start an internal thread in the JVM.  No Java thread objects exists
 383    so far.
 384
 385    IN:
 386       name.......UTF-8 name of the thread
 387       f..........function pointer to C function to start
 388
 389 *******************************************************************************/
 390
 391 static void thread_cleanup_finalizer(java_handle_t *h, void *data)
 392 {
 393         threadobject *t = reinterpret_cast<threadobject*>(data);
 394         ThreadList::release_thread(t, false);
 395 }
 396
 397 bool threads_thread_start_internal(utf *name, functionptr f)
 398 {
 399         threadobject *t;
 400
 401         /* Create internal thread data-structure. */
 402
 403         t = thread_new(THREAD_FLAG_INTERNAL | THREAD_FLAG_DAEMON);
 404
 405         /* Add the thread to the thread list. */
 406
 407         ThreadList::add_to_active_thread_list(t);
 408
 409         /* Create the Java thread object. */
 410
 411         if (!thread_create_object(t, javastring_new(name), threadgroup_system)) {
 412                 ThreadList::release_thread(t, true);
 413                 return false;
 414         }
 415
 416         Finalizer::attach_custom_finalizer(LLNI_WRAP(t->object), thread_cleanup_finalizer, t);
 417
 418         /* Start the thread. */
 419
 420         threads_impl_thread_start(t, f);
 421
 422         /* everything's ok */
 423
 424         return true;
 425 }
 426
 427
 428 /* threads_thread_start ********************************************************
 429
 430    Start a Java thread in the JVM.  Only the java thread object exists
 431    so far.
 432
 433    IN:
 434       object.....the java thread object java.lang.Thread
 435
 436 *******************************************************************************/
 437
 438 void threads_thread_start(java_handle_t *object)
 439 {
 440         java_lang_Thread jlt(object);
 441
 442         /* Create internal thread data-structure. */
 443
 444         u4 flags = THREAD_FLAG_JAVA;
 445 #if defined(ENABLE_JAVASE)
 446         /* Is this a daemon thread? */
 447
 448         if (jlt.get_daemon())
 449                 flags |= THREAD_FLAG_DAEMON;
 450 #endif
 451
 452         threadobject* t = thread_new(flags);
 453
 454         /* Link the two objects together. */
 455
 456         t->object = LLNI_DIRECT(object);
 457
 458         /* Add the thread to the thread list. */
 459
 460         ThreadList::add_to_active_thread_list(t);
 461
 462         Atomic::write_memory_barrier();
 463
 464         ThreadRuntime::setup_thread_vmdata(jlt, t);
 465
 466         Finalizer::attach_custom_finalizer(LLNI_WRAP(t->object), thread_cleanup_finalizer, t);
 467
 468         /* Start the thread.  Don't pass a function pointer (NULL) since
 469            we want Thread.run()V here. */
 470
 471         threads_impl_thread_start(t, NULL);
 472 }
 473
 474
 475 /**
 476  * Attaches the current thread to the VM.
 477  *
 478  * @param vm_aargs Attach arguments.
 479  * @param isdaemon true if the attached thread should be a daemon
 480  *                 thread.
 481  *
 482  * @return true on success, false otherwise.
 483  */
 484 bool thread_attach_current_thread(JavaVMAttachArgs *vm_aargs, bool isdaemon)
 485 {
 486         bool           result;
 487         threadobject  *t;
 488         utf           *u;
 489         java_handle_t *name;
 490         java_handle_t *group;
 491
 492     /* If the current thread has already been attached, this operation
 493            is a no-op. */
 494
 495         result = thread_current_is_attached();
 496
 497         if (result == true)
 498                 return true;
 499
 500         /* Create internal thread data structure. */
 501
 502         u4 flags = THREAD_FLAG_JAVA;
 503         if (isdaemon)
 504                 flags |= THREAD_FLAG_DAEMON;
 505
 506         t = thread_new(flags);
 507
 508         /* Store the internal thread data-structure in the TSD. */
 509
 510         thread_set_current(t);
 511
 512         /* The thread is flagged and (non-)daemon thread, we can leave the
 513            mutex. */
 514
 515         /* Add the thread to the thread list. */
 516
 517         ThreadList::add_to_active_thread_list(t);
 518
 519         DEBUGTHREADS("attaching", t);
 520
 521         /* Get the thread name. */
 522
 523         if (vm_aargs != NULL) {
 524                 u = utf_new_char(vm_aargs->name);
 525         }
 526         else {
 527                 u = utf_null;
 528         }
 529
 530         name = javastring_new(u);
 531
 532 #if defined(ENABLE_JAVASE)
 533         /* Get the threadgroup. */
 534
 535         if (vm_aargs != NULL)
 536                 group = (java_handle_t *) vm_aargs->group;
 537         else
 538                 group = NULL;
 539
 540         /* If no threadgroup was given, use the main threadgroup. */
 541
 542         if (group == NULL)
 543                 group = threadgroup_main;
 544 #endif
 545
 546 #if defined(ENABLE_INTRP)
 547         /* create interpreter stack */
 548
 549         if (opt_intrp) {
 550                 MSET(intrp_main_stack, 0, u1, opt_stacksize);
 551                 thread->_global_sp = (Cell *) (intrp_main_stack + opt_stacksize);
 552         }
 553 #endif
 554
 555         /* Create the Java thread object. */
 556
 557         if (!thread_create_object(t, name, group)) {
 558                 ThreadList::release_thread(t, true);
 559                 return false;
 560         }
 561
 562         /* The thread is completely initialized. */
 563
 564         thread_set_state_runnable(t);
 565
 566         return true;
 567 }
 568
 569
 570 /**
 571  * Attaches the current external thread to the VM.  This function is
 572  * called by JNI's AttachCurrentThread.
 573  *
 574  * @param vm_aargs Attach arguments.
 575  * @param isdaemon true if the attached thread should be a daemon
 576  *                 thread.
 577  *
 578  * @return true on success, false otherwise.
 579  */
 580 bool thread_attach_current_external_thread(JavaVMAttachArgs *vm_aargs, bool isdaemon)
 581 {
 582         int result;
 583
 584 #if defined(ENABLE_GC_BOEHM)
 585         struct GC_stack_base sb;
 586
 587         /* Register the thread with Boehm-GC.  This must happen before the
 588            thread allocates any memory from the GC heap.*/
 589
 590         result = GC_get_stack_base(&sb);
 591
 592         if (result != GC_SUCCESS)
 593                 vm_abort("threads_attach_current_thread: GC_get_stack_base failed");
 594
 595         GC_register_my_thread(&sb);
 596 #endif
 597
 598         result = thread_attach_current_thread(vm_aargs, isdaemon);
 599
 600         if (result == false) {
 601 #if defined(ENABLE_GC_BOEHM)
 602                 /* Unregister the thread. */
 603
 604                 GC_unregister_my_thread();
 605 #endif
 606
 607                 return false;
 608         }
 609
 610         return true;
 611 }
 612
 613
 614 /**
 615  * Detaches the current external thread from the VM.  This function is
 616  * called by JNI's DetachCurrentThread.
 617  *
 618  * @return true on success, false otherwise.
 619  */
 620 bool thread_detach_current_external_thread(void)
 621 {
 622         int result;
 623
 624         result = thread_detach_current_thread();
 625
 626         if (result == false)
 627                 return false;
 628
 629 #if defined(ENABLE_GC_BOEHM)
 630         /* Unregister the thread with Boehm-GC.  This must happen after
 631            the thread allocates any memory from the GC heap. */
 632
 633         /* Don't detach the main thread.  This is a workaround for
 634            OpenJDK's java launcher. */
 635         if (thread_get_current()->index != 1)
 636                 GC_unregister_my_thread();
 637 #endif
 638
 639         return true;
 640 }
 641
 642
 643 /* thread_fprint_name **********************************************************
 644
 645    Print the name of the given thread to the given stream.
 646
 647    ARGUMENTS:
 648        t ........ thread data-structure
 649        stream ... stream to print to
 650
 651 *******************************************************************************/
 652
 653 void thread_fprint_name(threadobject *t, FILE *stream)
 654 {
 655         if (LLNI_WRAP(t->object) == NULL)
 656                 vm_abort("");
 657
 658         java_lang_Thread jlt(LLNI_WRAP(t->object));
 659
 660         ThreadRuntime::print_thread_name(jlt, stream);
 661 }
 662
 663
 664 /* thread_print_info ***********************************************************
 665
 666    Print information of the passed thread.
 667
 668    ARGUMENTS:
 669        t ... thread data-structure.
 670
 671 *******************************************************************************/
 672
 673 void thread_print_info(threadobject *t)
 674 {
 675         java_lang_Thread jlt(LLNI_WRAP(t->object));
 676
 677         /* Print as much as we can when we are in state NEW. */
 678
 679         if (jlt.get_handle() != NULL) {
 680                 /* Print thread name. */
 681
 682                 printf("\"");
 683                 thread_fprint_name(t, stdout);
 684                 printf("\"");
 685         }
 686         else {
 687         }
 688
 689         if (thread_is_daemon(t))
 690                 printf(" daemon");
 691
 692         if (jlt.get_handle() != NULL) {
 693                 printf(" prio=%d", jlt.get_priority());
 694         }
 695
 696 #if SIZEOF_VOID_P == 8
 697         printf(" t=0x%016lx tid=0x%016lx (%ld)",
 698                    (ptrint) t, (ptrint) t->tid, (ptrint) t->tid);
 699 #else
 700         printf(" t=0x%08x tid=0x%08x (%d)",
 701                    (ptrint) t, (ptrint) t->tid, (ptrint) t->tid);
 702 #endif
 703
 704         printf(" index=%d", t->index);
 705
 706         /* Print thread state. */
 707
 708         int state = cacaothread_get_state(t);
 709
 710         switch (state) {
 711         case THREAD_STATE_NEW:
 712                 printf(" new");
 713                 break;
 714         case THREAD_STATE_RUNNABLE:
 715                 printf(" runnable");
 716                 break;
 717         case THREAD_STATE_BLOCKED:
 718                 printf(" blocked");
 719                 break;
 720         case THREAD_STATE_WAITING:
 721                 printf(" waiting");
 722                 break;
 723         case THREAD_STATE_TIMED_WAITING:
 724                 printf(" waiting on condition");
 725                 break;
 726         case THREAD_STATE_PARKED:
 727                 printf(" parked");
 728                 break;
 729         case THREAD_STATE_TIMED_PARKED:
 730                 printf(" timed parked");
 731                 break;
 732         case THREAD_STATE_TERMINATED:
 733                 printf(" terminated");
 734                 break;
 735         default:
 736                 vm_abort("thread_print_info: unknown thread state %d", state);
 737         }
 738 }
 739
 740
 741 /* threads_get_current_tid *****************************************************
 742
 743    Return the tid of the current thread.
 744
 745    RETURN VALUE:
 746        the current tid
 747
 748 *******************************************************************************/
 749
 750 intptr_t threads_get_current_tid(void)
 751 {
 752         threadobject *thread;
 753
 754         thread = THREADOBJECT;
 755
 756         /* this may happen during bootstrap */
 757
 758         if (thread == NULL)
 759                 return 0;
 760
 761         return (intptr_t) thread->tid;
 762 }
 763
 764
 765 /**
 766  * Set the current state of the given thread. This method should only
 767  * be called while holding the threadlist-lock and after checking that
 768  * the new state is valid. It is best to not call this method directly
 769  * but call the specific setter methods below.
 770  */
 771 static inline void thread_set_state(threadobject *t, int state)
 772 {
 773         // Set the state of our internal threadobject.
 774         t->state = state;
 775
 776         ThreadRuntime::set_javathread_state(t, state);
 777 }
 778
 779
 780 /* thread_set_state_runnable ***************************************************
 781
 782    Set the current state of the given thread to THREAD_STATE_RUNNABLE.
 783
 784    NOTE: If the thread has already terminated, don't set the state.
 785          This is important for threads_detach_thread.
 786
 787 *******************************************************************************/
 788
 789 void thread_set_state_runnable(threadobject *t)
 790 {
 791         if (t->state != THREAD_STATE_TERMINATED) {
 792                 thread_set_state(t, THREAD_STATE_RUNNABLE);
 793
 794                 DEBUGTHREADS("is RUNNABLE", t);
 795         }
 796 }
 797
 798
 799 /* thread_set_state_waiting ****************************************************
 800
 801    Set the current state of the given thread to THREAD_STATE_WAITING.
 802
 803    NOTE: If the thread has already terminated, don't set the state.
 804          This is important for threads_detach_thread.
 805
 806 *******************************************************************************/
 807
 808 void thread_set_state_waiting(threadobject *t)
 809 {
 810         if (t->state != THREAD_STATE_TERMINATED) {
 811                 thread_set_state(t, THREAD_STATE_WAITING);
 812
 813                 DEBUGTHREADS("is WAITING", t);
 814         }
 815 }
 816
 817
 818 /* thread_set_state_timed_waiting **********************************************
 819
 820    Set the current state of the given thread to
 821    THREAD_STATE_TIMED_WAITING.
 822
 823    NOTE: If the thread has already terminated, don't set the state.
 824          This is important for threads_detach_thread.
 825
 826 *******************************************************************************/
 827
 828 void thread_set_state_timed_waiting(threadobject *t)
 829 {
 830         if (t->state != THREAD_STATE_TERMINATED) {
 831                 thread_set_state(t, THREAD_STATE_TIMED_WAITING);
 832
 833                 DEBUGTHREADS("is TIMED_WAITING", t);
 834         }
 835 }
 836
 837
 838 /* thread_set_state_parked *****************************************************
 839
 840    Set the current state of the given thread to THREAD_STATE_PARKED.
 841
 842    NOTE: If the thread has already terminated, don't set the state.
 843          This is important for threads_detach_thread.
 844
 845 *******************************************************************************/
 846
 847 void thread_set_state_parked(threadobject *t)
 848 {
 849         if (t->state != THREAD_STATE_TERMINATED) {
 850                 thread_set_state(t, THREAD_STATE_PARKED);
 851
 852                 DEBUGTHREADS("is PARKED", t);
 853         }
 854 }
 855
 856
 857 /* thread_set_state_timed_parked ***********************************************
 858
 859    Set the current state of the given thread to THREAD_STATE_TIMED_PARKED.
 860
 861    NOTE: If the thread has already terminated, don't set the state.
 862          This is important for threads_detach_thread.
 863
 864 *******************************************************************************/
 865
 866 void thread_set_state_timed_parked(threadobject *t)
 867 {
 868         if (t->state != THREAD_STATE_TERMINATED) {
 869                 thread_set_state(t, THREAD_STATE_TIMED_PARKED);
 870
 871                 DEBUGTHREADS("is TIMED_PARKED", t);
 872         }
 873 }
 874
 875
 876 /* thread_set_state_terminated *************************************************
 877
 878    Set the current state of the given thread to
 879    THREAD_STATE_TERMINATED.
 880
 881 *******************************************************************************/
 882
 883 void thread_set_state_terminated(threadobject *t)
 884 {
 885         /* Set the state inside a lock. */
 886
 887         thread_set_state(t, THREAD_STATE_TERMINATED);
 888
 889         DEBUGTHREADS("is TERMINATED", t);
 890 }
 891
 892
 893 /* thread_get_thread **********************************************************
 894
 895    Return the thread data structure of the given Java thread object.
 896
 897    ARGUMENTS:
 898        h ... java.lang.{VM}Thread object
 899
 900    RETURN VALUE:
 901        the thread object
 902
 903    NOTE:
 904        Usage of this function without the thread list lock held is
 905        almost certainly a bug.
 906
 907 *******************************************************************************/
 908
 909 threadobject *thread_get_thread(java_handle_t *h)
 910 {
 911         return ThreadRuntime::get_threadobject_from_thread(h);
 912 }
 913
 914
 915 /* threads_thread_is_alive *****************************************************
 916
 917    Returns if the give thread is alive.
 918
 919 *******************************************************************************/
 920
 921 bool threads_thread_is_alive(threadobject *t)
 922 {
 923         int state;
 924
 925         state = cacaothread_get_state(t);
 926
 927         switch (state) {
 928         case THREAD_STATE_NEW:
 929         case THREAD_STATE_TERMINATED:
 930                 return false;
 931
 932         case THREAD_STATE_RUNNABLE:
 933         case THREAD_STATE_BLOCKED:
 934         case THREAD_STATE_WAITING:
 935         case THREAD_STATE_TIMED_WAITING:
 936         case THREAD_STATE_PARKED:
 937         case THREAD_STATE_TIMED_PARKED:
 938                 return true;
 939
 940         default:
 941                 vm_abort("threads_thread_is_alive: unknown thread state %d", state);
 942         }
 943
 944         /* keep compiler happy */
 945
 946         return false;
 947 }
 948
 949 /* thread_is_interrupted *******************************************************
 950
 951    Check if the given thread has been interrupted.
 952
 953    ARGUMENTS:
 954        t ... the thread to check
 955
 956    RETURN VALUE:
 957       true, if the given thread had been interrupted
 958
 959 *******************************************************************************/
 960
 961 bool thread_is_interrupted(threadobject *t)
 962 {
 963         /* We need the mutex because classpath will call this function when
 964            a blocking system call is interrupted. The mutex ensures that it will
 965            see the correct value for the interrupted flag. */
 966
 967         t->waitmutex->lock();
 968         bool interrupted = t->interrupted;
 969         t->waitmutex->unlock();
 970
 971         return interrupted;
 972 }
 973
 974
 975 /* thread_set_interrupted ******************************************************
 976
 977    Set the interrupted flag to the given value.
 978
 979    ARGUMENTS:
 980        interrupted ... value to set
 981
 982 *******************************************************************************/
 983
 984 void thread_set_interrupted(threadobject *t, bool interrupted)
 985 {
 986         t->waitmutex->lock();
 987         t->interrupted = interrupted;
 988         t->waitmutex->unlock();
 989 }
 990
 991 /* thread_handle_set_priority **************************************************
 992
 993    Calls threads_set_thread_priority for the threadobject associated
 994    with the thread indicated by handle th, while holding the thread
 995    list lock.
 996
 997 *******************************************************************************/
 998
 999 void thread_handle_set_priority(java_handle_t *th, int priority)
1000 {
1001         threadobject *t = thread_get_thread(th);
1002         /* For GNU classpath, this should not happen, because both
1003            setPriority() and start() are synchronized. */
1004         assert(t != 0);
1005         threads_set_thread_priority(t->tid, priority);
1006 }
1007
1008 /* thread_handle_is_interrupted ************************************************
1009
1010    Calls thread_is_interrupted for the threadobject associated with
1011    the thread indicated by handle th, while holding the thread list
1012    lock.
1013
1014 *******************************************************************************/
1015
1016 bool thread_handle_is_interrupted(java_handle_t *th)
1017 {
1018         threadobject *t = thread_get_thread(th);
1019         return t ? thread_is_interrupted(t) : false;
1020 }
1021
1022 /* thread_handle_interrupt *****************************************************
1023
1024    Calls threads_thread_interrupt for the threadobject associated with
1025    the thread indicated by handle th, while holding the thread list
1026    lock.
1027
1028 *******************************************************************************/
1029
1030 void thread_handle_interrupt(java_handle_t *th)
1031 {
1032         threadobject *t = thread_get_thread(th);
1033         /* For GNU classpath, this should not happen, because both
1034            interrupt() and start() are synchronized. */
1035         assert(t != 0);
1036         threads_thread_interrupt(t);
1037 }
1038
1039 /* thread_handle_get_state *****************************************************
1040
1041    Calls cacaothread_get_state for the threadobject associated with
1042    the thread indicated by handle th, while holding the thread list
1043    lock.
1044
1045 *******************************************************************************/
1046
1047 int thread_handle_get_state(java_handle_t *th)
1048 {
1049         threadobject *t = thread_get_thread(th);
1050         return t ? cacaothread_get_state(t) : THREAD_STATE_NEW;
1051 }
1052
1053
1054 /*
1055  * These are local overrides for various environment variables in Emacs.
1056  * Please do not remove this and leave it at the end of the file, where
1057  * Emacs will automagically detect them.
1058  * ---------------------------------------------------------------------
1059  * Local variables:
1060  * mode: c++
1061  * indent-tabs-mode: t
1062  * c-basic-offset: 4
1063  * tab-width: 4
1064  * End:
1065  * vim:noexpandtab:sw=4:ts=4:
1066  */