| 1 | ///////////////////////////////////////////////////////////////////////////// |
| 2 | // Name: threadpsx.cpp |
| 3 | // Purpose: wxThread (Posix) Implementation |
| 4 | // Author: Original from Wolfram Gloger/Guilhem Lavaux |
| 5 | // Modified by: |
| 6 | // Created: 04/22/98 |
| 7 | // RCS-ID: $Id$ |
| 8 | // Copyright: (c) Wolfram Gloger (1996, 1997) |
| 9 | // Guilhem Lavaux (1998) |
| 10 | // Robert Roebling (1999) |
| 11 | // Licence: wxWindows licence |
| 12 | ///////////////////////////////////////////////////////////////////////////// |
| 13 | |
| 14 | #ifdef __GNUG__ |
| 15 | #pragma implementation "thread.h" |
| 16 | #endif |
| 17 | |
| 18 | #include <stdio.h> |
| 19 | #include <unistd.h> |
| 20 | #include <pthread.h> |
| 21 | #include <errno.h> |
| 22 | |
| 23 | #ifdef __linux__ |
| 24 | #include <sched.h> |
| 25 | #endif |
| 26 | |
| 27 | #ifdef __SUN__ |
| 28 | extern int usleep(unsigned int useconds); |
| 29 | #endif |
| 30 | |
| 31 | |
| 32 | #include "wx/thread.h" |
| 33 | #include "wx/module.h" |
| 34 | #include "wx/utils.h" |
| 35 | #include "wx/log.h" |
| 36 | #include "wx/intl.h" |
| 37 | #include "wx/dynarray.h" |
| 38 | |
| 39 | #include "gdk/gdk.h" |
| 40 | #include "gtk/gtk.h" |
| 41 | |
| 42 | enum thread_state |
| 43 | { |
| 44 | STATE_NEW, // didn't start execution yet (=> RUNNING) |
| 45 | STATE_RUNNING, |
| 46 | STATE_PAUSED, |
| 47 | STATE_CANCELED, |
| 48 | STATE_EXITED |
| 49 | }; |
| 50 | |
| 51 | WX_DEFINE_ARRAY(wxThread *, wxArrayThread); |
| 52 | |
| 53 | // ----------------------------------------------------------------------------- |
| 54 | // global data |
| 55 | // ----------------------------------------------------------------------------- |
| 56 | |
| 57 | // we keep the list of all threads created by the application to be able to |
| 58 | // terminate them on exit if there are some left - otherwise the process would |
| 59 | // be left in memory |
| 60 | static wxArrayThread gs_allThreads; |
| 61 | |
| 62 | // the id of the main thread |
| 63 | static pthread_t gs_tidMain; |
| 64 | |
| 65 | // the key for the pointer to the associated wxThread object |
| 66 | static pthread_key_t gs_keySelf; |
| 67 | |
| 68 | // this mutex must be acquired before any call to a GUI function |
| 69 | static wxMutex *gs_mutexGui; |
| 70 | |
| 71 | //-------------------------------------------------------------------- |
| 72 | // common GUI thread code |
| 73 | //-------------------------------------------------------------------- |
| 74 | |
| 75 | #include "threadgui.inc" |
| 76 | |
| 77 | //-------------------------------------------------------------------- |
| 78 | // wxMutex (Posix implementation) |
| 79 | //-------------------------------------------------------------------- |
| 80 | |
| 81 | class wxMutexInternal |
| 82 | { |
| 83 | public: |
| 84 | pthread_mutex_t p_mutex; |
| 85 | }; |
| 86 | |
| 87 | wxMutex::wxMutex() |
| 88 | { |
| 89 | p_internal = new wxMutexInternal; |
| 90 | pthread_mutex_init( &(p_internal->p_mutex), (const pthread_mutexattr_t*) NULL ); |
| 91 | m_locked = 0; |
| 92 | } |
| 93 | |
| 94 | wxMutex::~wxMutex() |
| 95 | { |
| 96 | if (m_locked > 0) |
| 97 | wxLogDebug("Freeing a locked mutex (%d locks)", m_locked); |
| 98 | |
| 99 | pthread_mutex_destroy( &(p_internal->p_mutex) ); |
| 100 | delete p_internal; |
| 101 | } |
| 102 | |
| 103 | wxMutexError wxMutex::Lock() |
| 104 | { |
| 105 | int err = pthread_mutex_lock( &(p_internal->p_mutex) ); |
| 106 | if (err == EDEADLK) |
| 107 | { |
| 108 | wxLogDebug("Locking this mutex would lead to deadlock!"); |
| 109 | |
| 110 | return wxMUTEX_DEAD_LOCK; |
| 111 | } |
| 112 | |
| 113 | m_locked++; |
| 114 | |
| 115 | return wxMUTEX_NO_ERROR; |
| 116 | } |
| 117 | |
| 118 | wxMutexError wxMutex::TryLock() |
| 119 | { |
| 120 | if (m_locked) |
| 121 | { |
| 122 | return wxMUTEX_BUSY; |
| 123 | } |
| 124 | |
| 125 | int err = pthread_mutex_trylock( &(p_internal->p_mutex) ); |
| 126 | switch (err) |
| 127 | { |
| 128 | case EBUSY: return wxMUTEX_BUSY; |
| 129 | } |
| 130 | |
| 131 | m_locked++; |
| 132 | |
| 133 | return wxMUTEX_NO_ERROR; |
| 134 | } |
| 135 | |
| 136 | wxMutexError wxMutex::Unlock() |
| 137 | { |
| 138 | if (m_locked > 0) |
| 139 | { |
| 140 | m_locked--; |
| 141 | } |
| 142 | else |
| 143 | { |
| 144 | wxLogDebug("Unlocking not locked mutex."); |
| 145 | |
| 146 | return wxMUTEX_UNLOCKED; |
| 147 | } |
| 148 | |
| 149 | pthread_mutex_unlock( &(p_internal->p_mutex) ); |
| 150 | |
| 151 | return wxMUTEX_NO_ERROR; |
| 152 | } |
| 153 | |
| 154 | //-------------------------------------------------------------------- |
| 155 | // wxCondition (Posix implementation) |
| 156 | //-------------------------------------------------------------------- |
| 157 | |
| 158 | class wxConditionInternal |
| 159 | { |
| 160 | public: |
| 161 | pthread_cond_t p_condition; |
| 162 | }; |
| 163 | |
| 164 | wxCondition::wxCondition() |
| 165 | { |
| 166 | p_internal = new wxConditionInternal; |
| 167 | pthread_cond_init( &(p_internal->p_condition), (const pthread_condattr_t *) NULL ); |
| 168 | } |
| 169 | |
| 170 | wxCondition::~wxCondition() |
| 171 | { |
| 172 | pthread_cond_destroy( &(p_internal->p_condition) ); |
| 173 | |
| 174 | delete p_internal; |
| 175 | } |
| 176 | |
| 177 | void wxCondition::Wait(wxMutex& mutex) |
| 178 | { |
| 179 | pthread_cond_wait( &(p_internal->p_condition), &(mutex.p_internal->p_mutex) ); |
| 180 | } |
| 181 | |
| 182 | bool wxCondition::Wait(wxMutex& mutex, unsigned long sec, unsigned long nsec) |
| 183 | { |
| 184 | struct timespec tspec; |
| 185 | |
| 186 | tspec.tv_sec = time(0L)+sec; |
| 187 | tspec.tv_nsec = nsec; |
| 188 | return (pthread_cond_timedwait(&(p_internal->p_condition), &(mutex.p_internal->p_mutex), &tspec) != ETIMEDOUT); |
| 189 | } |
| 190 | |
| 191 | void wxCondition::Signal() |
| 192 | { |
| 193 | pthread_cond_signal( &(p_internal->p_condition) ); |
| 194 | } |
| 195 | |
| 196 | void wxCondition::Broadcast() |
| 197 | { |
| 198 | pthread_cond_broadcast( &(p_internal->p_condition) ); |
| 199 | } |
| 200 | |
| 201 | //-------------------------------------------------------------------- |
| 202 | // wxThread (Posix implementation) |
| 203 | //-------------------------------------------------------------------- |
| 204 | |
| 205 | class wxThreadInternal |
| 206 | { |
| 207 | public: |
| 208 | wxThreadInternal(); |
| 209 | ~wxThreadInternal(); |
| 210 | |
| 211 | // thread entry function |
| 212 | static void *PthreadStart(void *ptr); |
| 213 | |
| 214 | // thread actions |
| 215 | // start the thread |
| 216 | wxThreadError Run(); |
| 217 | // ask the thread to terminate |
| 218 | void Cancel(); |
| 219 | // wake up threads waiting for our termination |
| 220 | void SignalExit(); |
| 221 | // go to sleep until Resume() is called |
| 222 | void Pause(); |
| 223 | // resume the thread |
| 224 | void Resume(); |
| 225 | |
| 226 | // accessors |
| 227 | // priority |
| 228 | int GetPriority() const { return m_prio; } |
| 229 | void SetPriority(int prio) { m_prio = prio; } |
| 230 | // state |
| 231 | thread_state GetState() const { return m_state; } |
| 232 | void SetState(thread_state state) { m_state = state; } |
| 233 | // id |
| 234 | pthread_t GetId() const { return thread_id; } |
| 235 | // "cancelled" flag |
| 236 | bool WasCancelled() const { return m_cancelled; } |
| 237 | |
| 238 | //private: -- should be! |
| 239 | pthread_t thread_id; |
| 240 | |
| 241 | private: |
| 242 | thread_state m_state; // see thread_state enum |
| 243 | int m_prio; // in wxWindows units: from 0 to 100 |
| 244 | |
| 245 | // set when the thread should terminate |
| 246 | bool m_cancelled; |
| 247 | |
| 248 | // this (mutex, cond) pair is used to synchronize the main thread and this |
| 249 | // thread in several situations: |
| 250 | // 1. The thread function blocks until condition is signaled by Run() when |
| 251 | // it's initially created - this allows create thread in "suspended" |
| 252 | // state |
| 253 | // 2. The Delete() function blocks until the condition is signaled when the |
| 254 | // thread exits. |
| 255 | wxMutex m_mutex; |
| 256 | wxCondition m_cond; |
| 257 | |
| 258 | // another (mutex, cond) pair for Pause()/Resume() usage |
| 259 | // |
| 260 | // VZ: it's possible that we might reuse the mutex and condition from above |
| 261 | // for this too, but as I'm not at all sure that it won't create subtle |
| 262 | // problems with race conditions between, say, Pause() and Delete() I |
| 263 | // prefer this may be a bit less efficient but much safer solution |
| 264 | wxMutex m_mutexSuspend; |
| 265 | wxCondition m_condSuspend; |
| 266 | }; |
| 267 | |
| 268 | void *wxThreadInternal::PthreadStart(void *ptr) |
| 269 | { |
| 270 | wxThread *thread = (wxThread *)ptr; |
| 271 | wxThreadInternal *pthread = thread->p_internal; |
| 272 | |
| 273 | if ( pthread_setspecific(gs_keySelf, thread) != 0 ) |
| 274 | { |
| 275 | wxLogError(_("Can not start thread: error writing TLS.")); |
| 276 | |
| 277 | return (void *)-1; |
| 278 | } |
| 279 | |
| 280 | // wait for the condition to be signaled from Run() |
| 281 | // mutex state: currently locked by the thread which created us |
| 282 | pthread->m_cond.Wait(pthread->m_mutex); |
| 283 | |
| 284 | // mutex state: locked again on exit of Wait() |
| 285 | |
| 286 | // call the main entry |
| 287 | void* status = thread->Entry(); |
| 288 | |
| 289 | // terminate the thread |
| 290 | thread->Exit(status); |
| 291 | |
| 292 | wxFAIL_MSG("wxThread::Exit() can't return."); |
| 293 | |
| 294 | return NULL; |
| 295 | } |
| 296 | |
| 297 | wxThreadInternal::wxThreadInternal() |
| 298 | { |
| 299 | m_state = STATE_NEW; |
| 300 | m_cancelled = FALSE; |
| 301 | |
| 302 | // this mutex is locked during almost all thread lifetime - it will only be |
| 303 | // unlocked in the very end |
| 304 | m_mutex.Lock(); |
| 305 | |
| 306 | // this mutex is used in Pause()/Resume() and is also locked all the time |
| 307 | // unless the thread is paused |
| 308 | m_mutexSuspend.Lock(); |
| 309 | } |
| 310 | |
| 311 | wxThreadInternal::~wxThreadInternal() |
| 312 | { |
| 313 | m_mutexSuspend.Unlock(); |
| 314 | |
| 315 | // note that m_mutex will be unlocked by the thread which waits for our |
| 316 | // termination |
| 317 | } |
| 318 | |
| 319 | wxThreadError wxThreadInternal::Run() |
| 320 | { |
| 321 | wxCHECK_MSG( GetState() == STATE_NEW, wxTHREAD_RUNNING, |
| 322 | "thread may only be started once after successful Create()" ); |
| 323 | |
| 324 | // the mutex was locked on Create(), so we will be able to lock it again |
| 325 | // only when the thread really starts executing and enters the wait - |
| 326 | // otherwise we might signal the condition before anybody is waiting for it |
| 327 | wxMutexLocker lock(m_mutex); |
| 328 | m_cond.Signal(); |
| 329 | |
| 330 | m_state = STATE_RUNNING; |
| 331 | |
| 332 | return wxTHREAD_NO_ERROR; |
| 333 | |
| 334 | // now the mutex is unlocked back - but just to allow Wait() function to |
| 335 | // terminate by relocking it, so the net result is that the worker thread |
| 336 | // starts executing and the mutex is still locked |
| 337 | } |
| 338 | |
| 339 | void wxThreadInternal::Cancel() |
| 340 | { |
| 341 | // if the thread we're waiting for is waiting for the GUI mutex, we will |
| 342 | // deadlock so make sure we release it temporarily |
| 343 | if ( wxThread::IsMain() ) |
| 344 | wxMutexGuiLeave(); |
| 345 | |
| 346 | // nobody ever writes this variable so it's safe to not use any |
| 347 | // synchronization here |
| 348 | m_cancelled = TRUE; |
| 349 | |
| 350 | // entering Wait() releases the mutex thus allowing SignalExit() to acquire |
| 351 | // it and to signal us its termination |
| 352 | m_cond.Wait(m_mutex); |
| 353 | |
| 354 | // mutex is still in the locked state - relocked on exit from Wait(), so |
| 355 | // unlock it - we don't need it any more, the thread has already terminated |
| 356 | m_mutex.Unlock(); |
| 357 | |
| 358 | // reacquire GUI mutex |
| 359 | if ( wxThread::IsMain() ) |
| 360 | wxMutexGuiEnter(); |
| 361 | } |
| 362 | |
| 363 | void wxThreadInternal::SignalExit() |
| 364 | { |
| 365 | // as mutex is currently locked, this will block until some other thread |
| 366 | // (normally the same which created this one) unlocks it by entering Wait() |
| 367 | m_mutex.Lock(); |
| 368 | |
| 369 | // wake up all the threads waiting for our termination |
| 370 | m_cond.Broadcast(); |
| 371 | |
| 372 | // after this call mutex will be finally unlocked |
| 373 | m_mutex.Unlock(); |
| 374 | } |
| 375 | |
| 376 | void wxThreadInternal::Pause() |
| 377 | { |
| 378 | wxCHECK_RET( m_state == STATE_PAUSED, |
| 379 | "thread must first be paused with wxThread::Pause()." ); |
| 380 | |
| 381 | // wait until the condition is signaled from Resume() |
| 382 | m_condSuspend.Wait(m_mutexSuspend); |
| 383 | } |
| 384 | |
| 385 | void wxThreadInternal::Resume() |
| 386 | { |
| 387 | wxCHECK_RET( m_state == STATE_PAUSED, |
| 388 | "can't resume thread which is not suspended." ); |
| 389 | |
| 390 | // we will be able to lock this mutex only when Pause() starts waiting |
| 391 | wxMutexLocker lock(m_mutexSuspend); |
| 392 | m_condSuspend.Signal(); |
| 393 | |
| 394 | SetState(STATE_RUNNING); |
| 395 | } |
| 396 | |
| 397 | // ----------------------------------------------------------------------------- |
| 398 | // static functions |
| 399 | // ----------------------------------------------------------------------------- |
| 400 | |
| 401 | wxThread *wxThread::This() |
| 402 | { |
| 403 | return (wxThread *)pthread_getspecific(gs_keySelf); |
| 404 | } |
| 405 | |
| 406 | bool wxThread::IsMain() |
| 407 | { |
| 408 | return (bool)pthread_equal(pthread_self(), gs_tidMain); |
| 409 | } |
| 410 | |
| 411 | void wxThread::Yield() |
| 412 | { |
| 413 | #ifdef HAVE_SCHED_YIELD |
| 414 | sched_yield(); |
| 415 | #else // !HAVE_SCHED_YIELD |
| 416 | // may be it will have the desired effect? |
| 417 | Sleep(0); |
| 418 | #endif // HAVE_SCHED_YIELD |
| 419 | } |
| 420 | |
| 421 | void wxThread::Sleep(unsigned long milliseconds) |
| 422 | { |
| 423 | wxUsleep(milliseconds); |
| 424 | } |
| 425 | |
| 426 | // ----------------------------------------------------------------------------- |
| 427 | // creating thread |
| 428 | // ----------------------------------------------------------------------------- |
| 429 | |
| 430 | wxThread::wxThread() |
| 431 | { |
| 432 | // add this thread to the global list of all threads |
| 433 | gs_allThreads.Add(this); |
| 434 | |
| 435 | p_internal = new wxThreadInternal(); |
| 436 | } |
| 437 | |
| 438 | wxThreadError wxThread::Create() |
| 439 | { |
| 440 | if (p_internal->GetState() != STATE_NEW) |
| 441 | return wxTHREAD_RUNNING; |
| 442 | |
| 443 | // set up the thread attribute: right now, we only set thread priority |
| 444 | pthread_attr_t attr; |
| 445 | pthread_attr_init(&attr); |
| 446 | |
| 447 | #ifdef HAVE_THREAD_PRIORITY_FUNCTIONS |
| 448 | int prio; |
| 449 | if ( pthread_attr_getschedpolicy(&attr, &prio) != 0 ) |
| 450 | { |
| 451 | wxLogError(_("Can not retrieve thread scheduling policy.")); |
| 452 | } |
| 453 | |
| 454 | int min_prio = sched_get_priority_min(prio), |
| 455 | max_prio = sched_get_priority_max(prio); |
| 456 | |
| 457 | if ( min_prio == -1 || max_prio == -1 ) |
| 458 | { |
| 459 | wxLogError(_("Can not get priority range for scheduling policy %d."), |
| 460 | prio); |
| 461 | } |
| 462 | else |
| 463 | { |
| 464 | struct sched_param sp; |
| 465 | pthread_attr_getschedparam(&attr, &sp); |
| 466 | sp.sched_priority = min_prio + |
| 467 | (p_internal->GetPriority()*(max_prio-min_prio))/100; |
| 468 | pthread_attr_setschedparam(&attr, &sp); |
| 469 | } |
| 470 | #endif // HAVE_THREAD_PRIORITY_FUNCTIONS |
| 471 | |
| 472 | // create the new OS thread object |
| 473 | int rc = pthread_create(&p_internal->thread_id, &attr, |
| 474 | wxThreadInternal::PthreadStart, (void *)this); |
| 475 | pthread_attr_destroy(&attr); |
| 476 | |
| 477 | if ( rc != 0 ) |
| 478 | { |
| 479 | p_internal->SetState(STATE_EXITED); |
| 480 | return wxTHREAD_NO_RESOURCE; |
| 481 | } |
| 482 | |
| 483 | return wxTHREAD_NO_ERROR; |
| 484 | } |
| 485 | |
| 486 | wxThreadError wxThread::Run() |
| 487 | { |
| 488 | return p_internal->Run(); |
| 489 | } |
| 490 | |
| 491 | // ----------------------------------------------------------------------------- |
| 492 | // misc accessors |
| 493 | // ----------------------------------------------------------------------------- |
| 494 | |
| 495 | void wxThread::SetPriority(unsigned int prio) |
| 496 | { |
| 497 | wxCHECK_RET( ((int)WXTHREAD_MIN_PRIORITY <= (int)prio) && |
| 498 | ((int)prio <= (int)WXTHREAD_MAX_PRIORITY), |
| 499 | "invalid thread priority" ); |
| 500 | |
| 501 | wxCriticalSectionLocker lock(m_critsect); |
| 502 | |
| 503 | switch ( p_internal->GetState() ) |
| 504 | { |
| 505 | case STATE_NEW: |
| 506 | // thread not yet started, priority will be set when it is |
| 507 | p_internal->SetPriority(prio); |
| 508 | break; |
| 509 | |
| 510 | case STATE_RUNNING: |
| 511 | case STATE_PAUSED: |
| 512 | #ifdef HAVE_THREAD_PRIORITY_FUNCTIONS |
| 513 | { |
| 514 | struct sched_param sparam; |
| 515 | sparam.sched_priority = prio; |
| 516 | |
| 517 | if ( pthread_setschedparam(p_internal->GetId(), |
| 518 | SCHED_OTHER, &sparam) != 0 ) |
| 519 | { |
| 520 | wxLogError(_("Failed to set thread priority %d."), prio); |
| 521 | } |
| 522 | } |
| 523 | #endif // HAVE_THREAD_PRIORITY_FUNCTIONS |
| 524 | break; |
| 525 | |
| 526 | case STATE_EXITED: |
| 527 | default: |
| 528 | wxFAIL_MSG("impossible to set thread priority in this state"); |
| 529 | } |
| 530 | } |
| 531 | |
| 532 | unsigned int wxThread::GetPriority() const |
| 533 | { |
| 534 | wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect); |
| 535 | |
| 536 | return p_internal->GetPriority(); |
| 537 | } |
| 538 | |
| 539 | unsigned long wxThread::GetID() const |
| 540 | { |
| 541 | return (unsigned long)p_internal->thread_id; |
| 542 | } |
| 543 | |
| 544 | // ----------------------------------------------------------------------------- |
| 545 | // pause/resume |
| 546 | // ----------------------------------------------------------------------------- |
| 547 | |
| 548 | wxThreadError wxThread::Pause() |
| 549 | { |
| 550 | wxCriticalSectionLocker lock(m_critsect); |
| 551 | |
| 552 | if ( p_internal->GetState() != STATE_RUNNING ) |
| 553 | { |
| 554 | wxLogDebug("Can't pause thread which is not running."); |
| 555 | |
| 556 | return wxTHREAD_NOT_RUNNING; |
| 557 | } |
| 558 | |
| 559 | p_internal->SetState(STATE_PAUSED); |
| 560 | |
| 561 | return wxTHREAD_NO_ERROR; |
| 562 | } |
| 563 | |
| 564 | wxThreadError wxThread::Resume() |
| 565 | { |
| 566 | wxCriticalSectionLocker lock(m_critsect); |
| 567 | |
| 568 | if ( p_internal->GetState() == STATE_PAUSED ) |
| 569 | { |
| 570 | p_internal->Resume(); |
| 571 | |
| 572 | return wxTHREAD_NO_ERROR; |
| 573 | } |
| 574 | else |
| 575 | { |
| 576 | wxLogDebug("Attempt to resume a thread which is not paused."); |
| 577 | |
| 578 | return wxTHREAD_MISC_ERROR; |
| 579 | } |
| 580 | } |
| 581 | |
| 582 | // ----------------------------------------------------------------------------- |
| 583 | // exiting thread |
| 584 | // ----------------------------------------------------------------------------- |
| 585 | |
| 586 | wxThread::ExitCode wxThread::Delete() |
| 587 | { |
| 588 | m_critsect.Enter(); |
| 589 | thread_state state = p_internal->GetState(); |
| 590 | m_critsect.Leave(); |
| 591 | |
| 592 | switch ( state ) |
| 593 | { |
| 594 | case STATE_NEW: |
| 595 | case STATE_EXITED: |
| 596 | // nothing to do |
| 597 | break; |
| 598 | |
| 599 | case STATE_PAUSED: |
| 600 | // resume the thread first |
| 601 | Resume(); |
| 602 | |
| 603 | // fall through |
| 604 | |
| 605 | default: |
| 606 | // set the flag telling to the thread to stop and wait |
| 607 | p_internal->Cancel(); |
| 608 | } |
| 609 | |
| 610 | return NULL; |
| 611 | } |
| 612 | |
| 613 | wxThreadError wxThread::Kill() |
| 614 | { |
| 615 | switch ( p_internal->GetState() ) |
| 616 | { |
| 617 | case STATE_NEW: |
| 618 | case STATE_EXITED: |
| 619 | return wxTHREAD_NOT_RUNNING; |
| 620 | |
| 621 | default: |
| 622 | #ifdef HAVE_PTHREAD_CANCEL |
| 623 | if ( pthread_cancel(p_internal->GetId()) != 0 ) |
| 624 | #endif |
| 625 | { |
| 626 | wxLogError(_("Failed to terminate a thread.")); |
| 627 | |
| 628 | return wxTHREAD_MISC_ERROR; |
| 629 | } |
| 630 | |
| 631 | return wxTHREAD_NO_ERROR; |
| 632 | } |
| 633 | } |
| 634 | |
| 635 | void wxThread::Exit(void *status) |
| 636 | { |
| 637 | // first call user-level clean up code |
| 638 | OnExit(); |
| 639 | |
| 640 | // next wake up the threads waiting for us (OTOH, this function won't return |
| 641 | // until someone waited for us!) |
| 642 | p_internal->SignalExit(); |
| 643 | |
| 644 | p_internal->SetState(STATE_EXITED); |
| 645 | |
| 646 | // delete both C++ thread object and terminate the OS thread object |
| 647 | delete this; |
| 648 | pthread_exit(status); |
| 649 | } |
| 650 | |
| 651 | // also test whether we were paused |
| 652 | bool wxThread::TestDestroy() |
| 653 | { |
| 654 | wxCriticalSectionLocker lock((wxCriticalSection&)m_critsect); |
| 655 | |
| 656 | if ( p_internal->GetState() == STATE_PAUSED ) |
| 657 | { |
| 658 | // leave the crit section or the other threads will stop too if they try |
| 659 | // to call any of (seemingly harmless) IsXXX() functions while we sleep |
| 660 | m_critsect.Leave(); |
| 661 | |
| 662 | p_internal->Pause(); |
| 663 | |
| 664 | // enter it back before it's finally left in lock object dtor |
| 665 | m_critsect.Enter(); |
| 666 | } |
| 667 | |
| 668 | return p_internal->WasCancelled(); |
| 669 | } |
| 670 | |
| 671 | wxThread::~wxThread() |
| 672 | { |
| 673 | // remove this thread from the global array |
| 674 | gs_allThreads.Remove(this); |
| 675 | } |
| 676 | |
| 677 | // ----------------------------------------------------------------------------- |
| 678 | // state tests |
| 679 | // ----------------------------------------------------------------------------- |
| 680 | |
| 681 | bool wxThread::IsRunning() const |
| 682 | { |
| 683 | wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect); |
| 684 | |
| 685 | return p_internal->GetState() == STATE_RUNNING; |
| 686 | } |
| 687 | |
| 688 | bool wxThread::IsAlive() const |
| 689 | { |
| 690 | wxCriticalSectionLocker lock((wxCriticalSection&)m_critsect); |
| 691 | |
| 692 | switch ( p_internal->GetState() ) |
| 693 | { |
| 694 | case STATE_RUNNING: |
| 695 | case STATE_PAUSED: |
| 696 | return TRUE; |
| 697 | |
| 698 | default: |
| 699 | return FALSE; |
| 700 | } |
| 701 | } |
| 702 | |
| 703 | //-------------------------------------------------------------------- |
| 704 | // wxThreadModule |
| 705 | //-------------------------------------------------------------------- |
| 706 | |
| 707 | class wxThreadModule : public wxModule |
| 708 | { |
| 709 | public: |
| 710 | virtual bool OnInit(); |
| 711 | virtual void OnExit(); |
| 712 | |
| 713 | private: |
| 714 | DECLARE_DYNAMIC_CLASS(wxThreadModule) |
| 715 | }; |
| 716 | |
| 717 | IMPLEMENT_DYNAMIC_CLASS(wxThreadModule, wxModule) |
| 718 | |
| 719 | bool wxThreadModule::OnInit() |
| 720 | { |
| 721 | if ( pthread_key_create(&gs_keySelf, NULL /* dtor function */) != 0 ) |
| 722 | { |
| 723 | wxLogError(_("Thread module initialization failed: " |
| 724 | "failed to create pthread key.")); |
| 725 | |
| 726 | return FALSE; |
| 727 | } |
| 728 | |
| 729 | gs_mutexGui = new wxMutex(); |
| 730 | wxThreadGuiInit(); |
| 731 | gs_tidMain = pthread_self(); |
| 732 | gs_mutexGui->Lock(); |
| 733 | |
| 734 | return TRUE; |
| 735 | } |
| 736 | |
| 737 | void wxThreadModule::OnExit() |
| 738 | { |
| 739 | wxASSERT_MSG( wxThread::IsMain(), "only main thread can be here" ); |
| 740 | |
| 741 | // terminate any threads left |
| 742 | size_t count = gs_allThreads.GetCount(); |
| 743 | if ( count != 0u ) |
| 744 | wxLogDebug("Some threads were not terminated by the application."); |
| 745 | |
| 746 | for ( size_t n = 0u; n < count; n++ ) |
| 747 | { |
| 748 | gs_allThreads[n]->Delete(); |
| 749 | } |
| 750 | |
| 751 | // destroy GUI mutex |
| 752 | gs_mutexGui->Unlock(); |
| 753 | wxThreadGuiExit(); |
| 754 | delete gs_mutexGui; |
| 755 | |
| 756 | // and free TLD slot |
| 757 | (void)pthread_key_delete(gs_keySelf); |
| 758 | } |