| 1 | ///////////////////////////////////////////////////////////////////////////// |
| 2 | // Name: src/unix/threadpsx.cpp |
| 3 | // Purpose: wxThread (Posix) Implementation |
| 4 | // Author: Original from Wolfram Gloger/Guilhem Lavaux |
| 5 | // Modified by: K. S. Sreeram (2002): POSIXified wxCondition, added wxSemaphore |
| 6 | // Created: 04/22/98 |
| 7 | // RCS-ID: $Id$ |
| 8 | // Copyright: (c) Wolfram Gloger (1996, 1997) |
| 9 | // Guilhem Lavaux (1998) |
| 10 | // Vadim Zeitlin (1999-2002) |
| 11 | // Robert Roebling (1999) |
| 12 | // K. S. Sreeram (2002) |
| 13 | // Licence: wxWindows licence |
| 14 | ///////////////////////////////////////////////////////////////////////////// |
| 15 | |
| 16 | // ============================================================================ |
| 17 | // declaration |
| 18 | // ============================================================================ |
| 19 | |
| 20 | // ---------------------------------------------------------------------------- |
| 21 | // headers |
| 22 | // ---------------------------------------------------------------------------- |
| 23 | |
| 24 | // for compilers that support precompilation, includes "wx.h". |
| 25 | #include "wx/wxprec.h" |
| 26 | |
| 27 | #if wxUSE_THREADS |
| 28 | |
| 29 | #include "wx/thread.h" |
| 30 | #include "wx/except.h" |
| 31 | |
| 32 | #ifndef WX_PRECOMP |
| 33 | #include "wx/app.h" |
| 34 | #include "wx/dynarray.h" |
| 35 | #include "wx/intl.h" |
| 36 | #include "wx/log.h" |
| 37 | #include "wx/utils.h" |
| 38 | #include "wx/timer.h" |
| 39 | #include "wx/stopwatch.h" |
| 40 | #include "wx/module.h" |
| 41 | #endif |
| 42 | |
| 43 | #include <stdio.h> |
| 44 | #include <unistd.h> |
| 45 | #include <pthread.h> |
| 46 | #include <errno.h> |
| 47 | #include <time.h> |
| 48 | #include <sys/time.h> // needed for at least __QNX__ |
| 49 | #ifdef HAVE_SCHED_H |
| 50 | #include <sched.h> |
| 51 | #endif |
| 52 | |
| 53 | #ifdef HAVE_THR_SETCONCURRENCY |
| 54 | #include <thread.h> |
| 55 | #endif |
| 56 | |
| 57 | // we use wxFFile under Linux in GetCPUCount() |
| 58 | #ifdef __LINUX__ |
| 59 | #include "wx/ffile.h" |
| 60 | #include <sys/resource.h> // for setpriority() |
| 61 | #endif |
| 62 | |
| 63 | #ifdef __VMS |
| 64 | #define THR_ID(thr) ((long long)(thr)->GetId()) |
| 65 | #else |
| 66 | #define THR_ID(thr) ((long)(thr)->GetId()) |
| 67 | #endif |
| 68 | |
| 69 | // ---------------------------------------------------------------------------- |
| 70 | // constants |
| 71 | // ---------------------------------------------------------------------------- |
| 72 | |
| 73 | // the possible states of the thread and transitions from them |
| 74 | enum wxThreadState |
| 75 | { |
| 76 | STATE_NEW, // didn't start execution yet (=> RUNNING) |
| 77 | STATE_RUNNING, // running (=> PAUSED or EXITED) |
| 78 | STATE_PAUSED, // suspended (=> RUNNING or EXITED) |
| 79 | STATE_EXITED // thread doesn't exist any more |
| 80 | }; |
| 81 | |
| 82 | // the exit value of a thread which has been cancelled |
| 83 | static const wxThread::ExitCode EXITCODE_CANCELLED = (wxThread::ExitCode)-1; |
| 84 | |
| 85 | // trace mask for wxThread operations |
| 86 | #define TRACE_THREADS wxT("thread") |
| 87 | |
| 88 | // you can get additional debugging messages for the semaphore operations |
| 89 | #define TRACE_SEMA wxT("semaphore") |
| 90 | |
| 91 | // ---------------------------------------------------------------------------- |
| 92 | // private functions |
| 93 | // ---------------------------------------------------------------------------- |
| 94 | |
| 95 | static void ScheduleThreadForDeletion(); |
| 96 | static void DeleteThread(wxThread *This); |
| 97 | |
| 98 | // ---------------------------------------------------------------------------- |
| 99 | // private classes |
| 100 | // ---------------------------------------------------------------------------- |
| 101 | |
| 102 | // an (non owning) array of pointers to threads |
| 103 | WX_DEFINE_ARRAY_PTR(wxThread *, wxArrayThread); |
| 104 | |
| 105 | // an entry for a thread we can wait for |
| 106 | |
| 107 | // ----------------------------------------------------------------------------- |
| 108 | // global data |
| 109 | // ----------------------------------------------------------------------------- |
| 110 | |
| 111 | // we keep the list of all threads created by the application to be able to |
| 112 | // terminate them on exit if there are some left - otherwise the process would |
| 113 | // be left in memory |
| 114 | static wxArrayThread gs_allThreads; |
| 115 | |
| 116 | // a mutex to protect gs_allThreads |
| 117 | static wxMutex *gs_mutexAllThreads = NULL; |
| 118 | |
| 119 | // the id of the main thread |
| 120 | // |
| 121 | // we suppose that 0 is not a valid pthread_t value but in principle this might |
| 122 | // be false (e.g. if it's a selector-like value), wxThread::IsMain() would need |
| 123 | // to be updated in such case |
| 124 | wxThreadIdType wxThread::ms_idMainThread = 0; |
| 125 | |
| 126 | // the key for the pointer to the associated wxThread object |
| 127 | static pthread_key_t gs_keySelf; |
| 128 | |
| 129 | // the number of threads which are being deleted - the program won't exit |
| 130 | // until there are any left |
| 131 | static size_t gs_nThreadsBeingDeleted = 0; |
| 132 | |
| 133 | // a mutex to protect gs_nThreadsBeingDeleted |
| 134 | static wxMutex *gs_mutexDeleteThread = NULL; |
| 135 | |
| 136 | // and a condition variable which will be signaled when all |
| 137 | // gs_nThreadsBeingDeleted will have been deleted |
| 138 | static wxCondition *gs_condAllDeleted = NULL; |
| 139 | |
| 140 | // this mutex must be acquired before any call to a GUI function |
| 141 | // (it's not inside #if wxUSE_GUI because this file is compiled as part |
| 142 | // of wxBase) |
| 143 | static wxMutex *gs_mutexGui = NULL; |
| 144 | |
| 145 | // when we wait for a thread to exit, we're blocking on a condition which the |
| 146 | // thread signals in its SignalExit() method -- but this condition can't be a |
| 147 | // member of the thread itself as a detached thread may delete itself at any |
| 148 | // moment and accessing the condition member of the thread after this would |
| 149 | // result in a disaster |
| 150 | // |
| 151 | // so instead we maintain a global list of the structs below for the threads |
| 152 | // we're interested in waiting on |
| 153 | |
| 154 | // ============================================================================ |
| 155 | // wxMutex implementation |
| 156 | // ============================================================================ |
| 157 | |
| 158 | // ---------------------------------------------------------------------------- |
| 159 | // wxMutexInternal |
| 160 | // ---------------------------------------------------------------------------- |
| 161 | |
| 162 | // this is a simple wrapper around pthread_mutex_t which provides error |
| 163 | // checking |
| 164 | class wxMutexInternal |
| 165 | { |
| 166 | public: |
| 167 | wxMutexInternal(wxMutexType mutexType); |
| 168 | ~wxMutexInternal(); |
| 169 | |
| 170 | wxMutexError Lock(); |
| 171 | wxMutexError Lock(unsigned long ms); |
| 172 | wxMutexError TryLock(); |
| 173 | wxMutexError Unlock(); |
| 174 | |
| 175 | bool IsOk() const { return m_isOk; } |
| 176 | |
| 177 | private: |
| 178 | // convert the result of pthread_mutex_[timed]lock() call to wx return code |
| 179 | wxMutexError HandleLockResult(int err); |
| 180 | |
| 181 | private: |
| 182 | pthread_mutex_t m_mutex; |
| 183 | bool m_isOk; |
| 184 | wxMutexType m_type; |
| 185 | unsigned long m_owningThread; |
| 186 | |
| 187 | // wxConditionInternal uses our m_mutex |
| 188 | friend class wxConditionInternal; |
| 189 | }; |
| 190 | |
| 191 | #if defined(HAVE_PTHREAD_MUTEXATTR_T) && \ |
| 192 | wxUSE_UNIX && !defined(HAVE_PTHREAD_MUTEXATTR_SETTYPE_DECL) |
| 193 | // on some systems pthread_mutexattr_settype() is not in the headers (but it is |
| 194 | // in the library, otherwise we wouldn't compile this code at all) |
| 195 | extern "C" int pthread_mutexattr_settype(pthread_mutexattr_t *, int); |
| 196 | #endif |
| 197 | |
| 198 | wxMutexInternal::wxMutexInternal(wxMutexType mutexType) |
| 199 | { |
| 200 | m_type = mutexType; |
| 201 | m_owningThread = 0; |
| 202 | |
| 203 | int err; |
| 204 | switch ( mutexType ) |
| 205 | { |
| 206 | case wxMUTEX_RECURSIVE: |
| 207 | // support recursive locks like Win32, i.e. a thread can lock a |
| 208 | // mutex which it had itself already locked |
| 209 | // |
| 210 | // unfortunately initialization of recursive mutexes is non |
| 211 | // portable, so try several methods |
| 212 | #ifdef HAVE_PTHREAD_MUTEXATTR_T |
| 213 | { |
| 214 | pthread_mutexattr_t attr; |
| 215 | pthread_mutexattr_init(&attr); |
| 216 | pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE); |
| 217 | |
| 218 | err = pthread_mutex_init(&m_mutex, &attr); |
| 219 | } |
| 220 | #elif defined(HAVE_PTHREAD_RECURSIVE_MUTEX_INITIALIZER) |
| 221 | // we can use this only as initializer so we have to assign it |
| 222 | // first to a temp var - assigning directly to m_mutex wouldn't |
| 223 | // even compile |
| 224 | { |
| 225 | pthread_mutex_t mutex = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP; |
| 226 | m_mutex = mutex; |
| 227 | } |
| 228 | #else // no recursive mutexes |
| 229 | err = EINVAL; |
| 230 | #endif // HAVE_PTHREAD_MUTEXATTR_T/... |
| 231 | break; |
| 232 | |
| 233 | default: |
| 234 | wxFAIL_MSG( wxT("unknown mutex type") ); |
| 235 | // fall through |
| 236 | |
| 237 | case wxMUTEX_DEFAULT: |
| 238 | err = pthread_mutex_init(&m_mutex, NULL); |
| 239 | break; |
| 240 | } |
| 241 | |
| 242 | m_isOk = err == 0; |
| 243 | if ( !m_isOk ) |
| 244 | { |
| 245 | wxLogApiError( wxT("pthread_mutex_init()"), err); |
| 246 | } |
| 247 | } |
| 248 | |
| 249 | wxMutexInternal::~wxMutexInternal() |
| 250 | { |
| 251 | if ( m_isOk ) |
| 252 | { |
| 253 | int err = pthread_mutex_destroy(&m_mutex); |
| 254 | if ( err != 0 ) |
| 255 | { |
| 256 | wxLogApiError( wxT("pthread_mutex_destroy()"), err); |
| 257 | } |
| 258 | } |
| 259 | } |
| 260 | |
| 261 | wxMutexError wxMutexInternal::Lock() |
| 262 | { |
| 263 | if ((m_type == wxMUTEX_DEFAULT) && (m_owningThread != 0)) |
| 264 | { |
| 265 | if (m_owningThread == wxThread::GetCurrentId()) |
| 266 | return wxMUTEX_DEAD_LOCK; |
| 267 | } |
| 268 | |
| 269 | return HandleLockResult(pthread_mutex_lock(&m_mutex)); |
| 270 | } |
| 271 | |
| 272 | wxMutexError wxMutexInternal::Lock(unsigned long ms) |
| 273 | { |
| 274 | #ifdef HAVE_PTHREAD_MUTEX_TIMEDLOCK |
| 275 | static const long MSEC_IN_SEC = 1000; |
| 276 | static const long NSEC_IN_MSEC = 1000000; |
| 277 | static const long NSEC_IN_USEC = 1000; |
| 278 | static const long NSEC_IN_SEC = MSEC_IN_SEC * NSEC_IN_MSEC; |
| 279 | |
| 280 | time_t seconds = ms/MSEC_IN_SEC; |
| 281 | long nanoseconds = (ms % MSEC_IN_SEC) * NSEC_IN_MSEC; |
| 282 | timespec ts = { 0, 0 }; |
| 283 | |
| 284 | // normally we should use clock_gettime(CLOCK_REALTIME) here but this |
| 285 | // function is in librt and we don't link with it currently, so use |
| 286 | // gettimeofday() instead -- if it turns out that this is really too |
| 287 | // imprecise, we should modify configure to check if clock_gettime() is |
| 288 | // available and whether it requires -lrt and use it instead |
| 289 | #if 0 |
| 290 | if ( clock_gettime(CLOCK_REALTIME, &ts) == 0 ) |
| 291 | { |
| 292 | } |
| 293 | #else |
| 294 | struct timeval tv; |
| 295 | if ( wxGetTimeOfDay(&tv) != -1 ) |
| 296 | { |
| 297 | ts.tv_sec = tv.tv_sec; |
| 298 | ts.tv_nsec = tv.tv_usec*NSEC_IN_USEC; |
| 299 | } |
| 300 | #endif |
| 301 | else // fall back on system timer |
| 302 | { |
| 303 | ts.tv_sec = time(NULL); |
| 304 | } |
| 305 | |
| 306 | ts.tv_sec += seconds; |
| 307 | ts.tv_nsec += nanoseconds; |
| 308 | if ( ts.tv_nsec > NSEC_IN_SEC ) |
| 309 | { |
| 310 | ts.tv_sec += 1; |
| 311 | ts.tv_nsec -= NSEC_IN_SEC; |
| 312 | } |
| 313 | |
| 314 | return HandleLockResult(pthread_mutex_timedlock(&m_mutex, &ts)); |
| 315 | #else // !HAVE_PTHREAD_MUTEX_TIMEDLOCK |
| 316 | wxUnusedVar(ms); |
| 317 | |
| 318 | return wxMUTEX_MISC_ERROR; |
| 319 | #endif // HAVE_PTHREAD_MUTEX_TIMEDLOCK/!HAVE_PTHREAD_MUTEX_TIMEDLOCK |
| 320 | } |
| 321 | |
| 322 | wxMutexError wxMutexInternal::HandleLockResult(int err) |
| 323 | { |
| 324 | // wxPrintf( "err %d\n", err ); |
| 325 | |
| 326 | switch ( err ) |
| 327 | { |
| 328 | case EDEADLK: |
| 329 | // only error checking mutexes return this value and so it's an |
| 330 | // unexpected situation -- hence use assert, not wxLogDebug |
| 331 | wxFAIL_MSG( wxT("mutex deadlock prevented") ); |
| 332 | return wxMUTEX_DEAD_LOCK; |
| 333 | |
| 334 | case EINVAL: |
| 335 | wxLogDebug(wxT("pthread_mutex_[timed]lock(): mutex not initialized")); |
| 336 | break; |
| 337 | |
| 338 | case ETIMEDOUT: |
| 339 | return wxMUTEX_TIMEOUT; |
| 340 | |
| 341 | case 0: |
| 342 | if (m_type == wxMUTEX_DEFAULT) |
| 343 | m_owningThread = wxThread::GetCurrentId(); |
| 344 | return wxMUTEX_NO_ERROR; |
| 345 | |
| 346 | default: |
| 347 | wxLogApiError(wxT("pthread_mutex_[timed]lock()"), err); |
| 348 | } |
| 349 | |
| 350 | return wxMUTEX_MISC_ERROR; |
| 351 | } |
| 352 | |
| 353 | |
| 354 | wxMutexError wxMutexInternal::TryLock() |
| 355 | { |
| 356 | int err = pthread_mutex_trylock(&m_mutex); |
| 357 | switch ( err ) |
| 358 | { |
| 359 | case EBUSY: |
| 360 | // not an error: mutex is already locked, but we're prepared for |
| 361 | // this |
| 362 | return wxMUTEX_BUSY; |
| 363 | |
| 364 | case EINVAL: |
| 365 | wxLogDebug(wxT("pthread_mutex_trylock(): mutex not initialized.")); |
| 366 | break; |
| 367 | |
| 368 | case 0: |
| 369 | if (m_type == wxMUTEX_DEFAULT) |
| 370 | m_owningThread = wxThread::GetCurrentId(); |
| 371 | return wxMUTEX_NO_ERROR; |
| 372 | |
| 373 | default: |
| 374 | wxLogApiError(wxT("pthread_mutex_trylock()"), err); |
| 375 | } |
| 376 | |
| 377 | return wxMUTEX_MISC_ERROR; |
| 378 | } |
| 379 | |
| 380 | wxMutexError wxMutexInternal::Unlock() |
| 381 | { |
| 382 | m_owningThread = 0; |
| 383 | |
| 384 | int err = pthread_mutex_unlock(&m_mutex); |
| 385 | switch ( err ) |
| 386 | { |
| 387 | case EPERM: |
| 388 | // we don't own the mutex |
| 389 | return wxMUTEX_UNLOCKED; |
| 390 | |
| 391 | case EINVAL: |
| 392 | wxLogDebug(wxT("pthread_mutex_unlock(): mutex not initialized.")); |
| 393 | break; |
| 394 | |
| 395 | case 0: |
| 396 | return wxMUTEX_NO_ERROR; |
| 397 | |
| 398 | default: |
| 399 | wxLogApiError(wxT("pthread_mutex_unlock()"), err); |
| 400 | } |
| 401 | |
| 402 | return wxMUTEX_MISC_ERROR; |
| 403 | } |
| 404 | |
| 405 | // =========================================================================== |
| 406 | // wxCondition implementation |
| 407 | // =========================================================================== |
| 408 | |
| 409 | // --------------------------------------------------------------------------- |
| 410 | // wxConditionInternal |
| 411 | // --------------------------------------------------------------------------- |
| 412 | |
| 413 | // this is a wrapper around pthread_cond_t associated with a wxMutex (and hence |
| 414 | // with a pthread_mutex_t) |
| 415 | class wxConditionInternal |
| 416 | { |
| 417 | public: |
| 418 | wxConditionInternal(wxMutex& mutex); |
| 419 | ~wxConditionInternal(); |
| 420 | |
| 421 | bool IsOk() const { return m_isOk && m_mutex.IsOk(); } |
| 422 | |
| 423 | wxCondError Wait(); |
| 424 | wxCondError WaitTimeout(unsigned long milliseconds); |
| 425 | |
| 426 | wxCondError Signal(); |
| 427 | wxCondError Broadcast(); |
| 428 | |
| 429 | private: |
| 430 | // get the POSIX mutex associated with us |
| 431 | pthread_mutex_t *GetPMutex() const { return &m_mutex.m_internal->m_mutex; } |
| 432 | |
| 433 | wxMutex& m_mutex; |
| 434 | pthread_cond_t m_cond; |
| 435 | |
| 436 | bool m_isOk; |
| 437 | }; |
| 438 | |
| 439 | wxConditionInternal::wxConditionInternal(wxMutex& mutex) |
| 440 | : m_mutex(mutex) |
| 441 | { |
| 442 | int err = pthread_cond_init(&m_cond, NULL /* default attributes */); |
| 443 | |
| 444 | m_isOk = err == 0; |
| 445 | |
| 446 | if ( !m_isOk ) |
| 447 | { |
| 448 | wxLogApiError(wxT("pthread_cond_init()"), err); |
| 449 | } |
| 450 | } |
| 451 | |
| 452 | wxConditionInternal::~wxConditionInternal() |
| 453 | { |
| 454 | if ( m_isOk ) |
| 455 | { |
| 456 | int err = pthread_cond_destroy(&m_cond); |
| 457 | if ( err != 0 ) |
| 458 | { |
| 459 | wxLogApiError(wxT("pthread_cond_destroy()"), err); |
| 460 | } |
| 461 | } |
| 462 | } |
| 463 | |
| 464 | wxCondError wxConditionInternal::Wait() |
| 465 | { |
| 466 | int err = pthread_cond_wait(&m_cond, GetPMutex()); |
| 467 | if ( err != 0 ) |
| 468 | { |
| 469 | wxLogApiError(wxT("pthread_cond_wait()"), err); |
| 470 | |
| 471 | return wxCOND_MISC_ERROR; |
| 472 | } |
| 473 | |
| 474 | return wxCOND_NO_ERROR; |
| 475 | } |
| 476 | |
| 477 | wxCondError wxConditionInternal::WaitTimeout(unsigned long milliseconds) |
| 478 | { |
| 479 | wxLongLong curtime = wxGetLocalTimeMillis(); |
| 480 | curtime += milliseconds; |
| 481 | wxLongLong temp = curtime / 1000; |
| 482 | int sec = temp.GetLo(); |
| 483 | temp *= 1000; |
| 484 | temp = curtime - temp; |
| 485 | int millis = temp.GetLo(); |
| 486 | |
| 487 | timespec tspec; |
| 488 | |
| 489 | tspec.tv_sec = sec; |
| 490 | tspec.tv_nsec = millis * 1000L * 1000L; |
| 491 | |
| 492 | int err = pthread_cond_timedwait( &m_cond, GetPMutex(), &tspec ); |
| 493 | switch ( err ) |
| 494 | { |
| 495 | case ETIMEDOUT: |
| 496 | return wxCOND_TIMEOUT; |
| 497 | |
| 498 | case 0: |
| 499 | return wxCOND_NO_ERROR; |
| 500 | |
| 501 | default: |
| 502 | wxLogApiError(wxT("pthread_cond_timedwait()"), err); |
| 503 | } |
| 504 | |
| 505 | return wxCOND_MISC_ERROR; |
| 506 | } |
| 507 | |
| 508 | wxCondError wxConditionInternal::Signal() |
| 509 | { |
| 510 | int err = pthread_cond_signal(&m_cond); |
| 511 | if ( err != 0 ) |
| 512 | { |
| 513 | wxLogApiError(wxT("pthread_cond_signal()"), err); |
| 514 | |
| 515 | return wxCOND_MISC_ERROR; |
| 516 | } |
| 517 | |
| 518 | return wxCOND_NO_ERROR; |
| 519 | } |
| 520 | |
| 521 | wxCondError wxConditionInternal::Broadcast() |
| 522 | { |
| 523 | int err = pthread_cond_broadcast(&m_cond); |
| 524 | if ( err != 0 ) |
| 525 | { |
| 526 | wxLogApiError(wxT("pthread_cond_broadcast()"), err); |
| 527 | |
| 528 | return wxCOND_MISC_ERROR; |
| 529 | } |
| 530 | |
| 531 | return wxCOND_NO_ERROR; |
| 532 | } |
| 533 | |
| 534 | // =========================================================================== |
| 535 | // wxSemaphore implementation |
| 536 | // =========================================================================== |
| 537 | |
| 538 | // --------------------------------------------------------------------------- |
| 539 | // wxSemaphoreInternal |
| 540 | // --------------------------------------------------------------------------- |
| 541 | |
| 542 | // we implement the semaphores using mutexes and conditions instead of using |
| 543 | // the sem_xxx() POSIX functions because they're not widely available and also |
| 544 | // because it's impossible to implement WaitTimeout() using them |
| 545 | class wxSemaphoreInternal |
| 546 | { |
| 547 | public: |
| 548 | wxSemaphoreInternal(int initialcount, int maxcount); |
| 549 | |
| 550 | bool IsOk() const { return m_isOk; } |
| 551 | |
| 552 | wxSemaError Wait(); |
| 553 | wxSemaError TryWait(); |
| 554 | wxSemaError WaitTimeout(unsigned long milliseconds); |
| 555 | |
| 556 | wxSemaError Post(); |
| 557 | |
| 558 | private: |
| 559 | wxMutex m_mutex; |
| 560 | wxCondition m_cond; |
| 561 | |
| 562 | size_t m_count, |
| 563 | m_maxcount; |
| 564 | |
| 565 | bool m_isOk; |
| 566 | }; |
| 567 | |
| 568 | wxSemaphoreInternal::wxSemaphoreInternal(int initialcount, int maxcount) |
| 569 | : m_cond(m_mutex) |
| 570 | { |
| 571 | |
| 572 | if ( (initialcount < 0 || maxcount < 0) || |
| 573 | ((maxcount > 0) && (initialcount > maxcount)) ) |
| 574 | { |
| 575 | wxFAIL_MSG( wxT("wxSemaphore: invalid initial or maximal count") ); |
| 576 | |
| 577 | m_isOk = false; |
| 578 | } |
| 579 | else |
| 580 | { |
| 581 | m_maxcount = (size_t)maxcount; |
| 582 | m_count = (size_t)initialcount; |
| 583 | } |
| 584 | |
| 585 | m_isOk = m_mutex.IsOk() && m_cond.IsOk(); |
| 586 | } |
| 587 | |
| 588 | wxSemaError wxSemaphoreInternal::Wait() |
| 589 | { |
| 590 | wxMutexLocker locker(m_mutex); |
| 591 | |
| 592 | while ( m_count == 0 ) |
| 593 | { |
| 594 | wxLogTrace(TRACE_SEMA, |
| 595 | wxT("Thread %p waiting for semaphore to become signalled"), |
| 596 | wxThread::GetCurrentId()); |
| 597 | |
| 598 | if ( m_cond.Wait() != wxCOND_NO_ERROR ) |
| 599 | return wxSEMA_MISC_ERROR; |
| 600 | |
| 601 | wxLogTrace(TRACE_SEMA, |
| 602 | wxT("Thread %p finished waiting for semaphore, count = %lu"), |
| 603 | wxThread::GetCurrentId(), (unsigned long)m_count); |
| 604 | } |
| 605 | |
| 606 | m_count--; |
| 607 | |
| 608 | return wxSEMA_NO_ERROR; |
| 609 | } |
| 610 | |
| 611 | wxSemaError wxSemaphoreInternal::TryWait() |
| 612 | { |
| 613 | wxMutexLocker locker(m_mutex); |
| 614 | |
| 615 | if ( m_count == 0 ) |
| 616 | return wxSEMA_BUSY; |
| 617 | |
| 618 | m_count--; |
| 619 | |
| 620 | return wxSEMA_NO_ERROR; |
| 621 | } |
| 622 | |
| 623 | wxSemaError wxSemaphoreInternal::WaitTimeout(unsigned long milliseconds) |
| 624 | { |
| 625 | wxMutexLocker locker(m_mutex); |
| 626 | |
| 627 | wxLongLong startTime = wxGetLocalTimeMillis(); |
| 628 | |
| 629 | while ( m_count == 0 ) |
| 630 | { |
| 631 | wxLongLong elapsed = wxGetLocalTimeMillis() - startTime; |
| 632 | long remainingTime = (long)milliseconds - (long)elapsed.GetLo(); |
| 633 | if ( remainingTime <= 0 ) |
| 634 | { |
| 635 | // timeout |
| 636 | return wxSEMA_TIMEOUT; |
| 637 | } |
| 638 | |
| 639 | switch ( m_cond.WaitTimeout(remainingTime) ) |
| 640 | { |
| 641 | case wxCOND_TIMEOUT: |
| 642 | return wxSEMA_TIMEOUT; |
| 643 | |
| 644 | default: |
| 645 | return wxSEMA_MISC_ERROR; |
| 646 | |
| 647 | case wxCOND_NO_ERROR: |
| 648 | ; |
| 649 | } |
| 650 | } |
| 651 | |
| 652 | m_count--; |
| 653 | |
| 654 | return wxSEMA_NO_ERROR; |
| 655 | } |
| 656 | |
| 657 | wxSemaError wxSemaphoreInternal::Post() |
| 658 | { |
| 659 | wxMutexLocker locker(m_mutex); |
| 660 | |
| 661 | if ( m_maxcount > 0 && m_count == m_maxcount ) |
| 662 | { |
| 663 | return wxSEMA_OVERFLOW; |
| 664 | } |
| 665 | |
| 666 | m_count++; |
| 667 | |
| 668 | wxLogTrace(TRACE_SEMA, |
| 669 | wxT("Thread %p about to signal semaphore, count = %lu"), |
| 670 | wxThread::GetCurrentId(), (unsigned long)m_count); |
| 671 | |
| 672 | return m_cond.Signal() == wxCOND_NO_ERROR ? wxSEMA_NO_ERROR |
| 673 | : wxSEMA_MISC_ERROR; |
| 674 | } |
| 675 | |
| 676 | // =========================================================================== |
| 677 | // wxThread implementation |
| 678 | // =========================================================================== |
| 679 | |
| 680 | // the thread callback functions must have the C linkage |
| 681 | extern "C" |
| 682 | { |
| 683 | |
| 684 | #ifdef wxHAVE_PTHREAD_CLEANUP |
| 685 | // thread exit function |
| 686 | void wxPthreadCleanup(void *ptr); |
| 687 | #endif // wxHAVE_PTHREAD_CLEANUP |
| 688 | |
| 689 | void *wxPthreadStart(void *ptr); |
| 690 | |
| 691 | } // extern "C" |
| 692 | |
| 693 | // ---------------------------------------------------------------------------- |
| 694 | // wxThreadInternal |
| 695 | // ---------------------------------------------------------------------------- |
| 696 | |
| 697 | class wxThreadInternal |
| 698 | { |
| 699 | public: |
| 700 | wxThreadInternal(); |
| 701 | ~wxThreadInternal(); |
| 702 | |
| 703 | // thread entry function |
| 704 | static void *PthreadStart(wxThread *thread); |
| 705 | |
| 706 | // thread actions |
| 707 | // start the thread |
| 708 | wxThreadError Run(); |
| 709 | // unblock the thread allowing it to run |
| 710 | void SignalRun() { m_semRun.Post(); } |
| 711 | // ask the thread to terminate |
| 712 | void Wait(); |
| 713 | // go to sleep until Resume() is called |
| 714 | void Pause(); |
| 715 | // resume the thread |
| 716 | void Resume(); |
| 717 | |
| 718 | // accessors |
| 719 | // priority |
| 720 | int GetPriority() const { return m_prio; } |
| 721 | void SetPriority(int prio) { m_prio = prio; } |
| 722 | // state |
| 723 | wxThreadState GetState() const { return m_state; } |
| 724 | void SetState(wxThreadState state) |
| 725 | { |
| 726 | #if wxUSE_LOG_TRACE |
| 727 | static const wxChar *const stateNames[] = |
| 728 | { |
| 729 | wxT("NEW"), |
| 730 | wxT("RUNNING"), |
| 731 | wxT("PAUSED"), |
| 732 | wxT("EXITED"), |
| 733 | }; |
| 734 | |
| 735 | wxLogTrace(TRACE_THREADS, wxT("Thread %p: %s => %s."), |
| 736 | GetId(), stateNames[m_state], stateNames[state]); |
| 737 | #endif // wxUSE_LOG_TRACE |
| 738 | |
| 739 | m_state = state; |
| 740 | } |
| 741 | // id |
| 742 | pthread_t GetId() const { return m_threadId; } |
| 743 | pthread_t *GetIdPtr() { return &m_threadId; } |
| 744 | // "cancelled" flag |
| 745 | void SetCancelFlag() { m_cancelled = true; } |
| 746 | bool WasCancelled() const { return m_cancelled; } |
| 747 | // exit code |
| 748 | void SetExitCode(wxThread::ExitCode exitcode) { m_exitcode = exitcode; } |
| 749 | wxThread::ExitCode GetExitCode() const { return m_exitcode; } |
| 750 | |
| 751 | // the pause flag |
| 752 | void SetReallyPaused(bool paused) { m_isPaused = paused; } |
| 753 | bool IsReallyPaused() const { return m_isPaused; } |
| 754 | |
| 755 | // tell the thread that it is a detached one |
| 756 | void Detach() |
| 757 | { |
| 758 | wxCriticalSectionLocker lock(m_csJoinFlag); |
| 759 | |
| 760 | m_shouldBeJoined = false; |
| 761 | m_isDetached = true; |
| 762 | } |
| 763 | |
| 764 | #ifdef wxHAVE_PTHREAD_CLEANUP |
| 765 | // this is used by wxPthreadCleanup() only |
| 766 | static void Cleanup(wxThread *thread); |
| 767 | #endif // wxHAVE_PTHREAD_CLEANUP |
| 768 | |
| 769 | private: |
| 770 | pthread_t m_threadId; // id of the thread |
| 771 | wxThreadState m_state; // see wxThreadState enum |
| 772 | int m_prio; // in wxWidgets units: from 0 to 100 |
| 773 | |
| 774 | // this flag is set when the thread should terminate |
| 775 | bool m_cancelled; |
| 776 | |
| 777 | // this flag is set when the thread is blocking on m_semSuspend |
| 778 | bool m_isPaused; |
| 779 | |
| 780 | // the thread exit code - only used for joinable (!detached) threads and |
| 781 | // is only valid after the thread termination |
| 782 | wxThread::ExitCode m_exitcode; |
| 783 | |
| 784 | // many threads may call Wait(), but only one of them should call |
| 785 | // pthread_join(), so we have to keep track of this |
| 786 | wxCriticalSection m_csJoinFlag; |
| 787 | bool m_shouldBeJoined; |
| 788 | bool m_isDetached; |
| 789 | |
| 790 | // this semaphore is posted by Run() and the threads Entry() is not |
| 791 | // called before it is done |
| 792 | wxSemaphore m_semRun; |
| 793 | |
| 794 | // this one is signaled when the thread should resume after having been |
| 795 | // Pause()d |
| 796 | wxSemaphore m_semSuspend; |
| 797 | }; |
| 798 | |
| 799 | // ---------------------------------------------------------------------------- |
| 800 | // thread startup and exit functions |
| 801 | // ---------------------------------------------------------------------------- |
| 802 | |
| 803 | void *wxPthreadStart(void *ptr) |
| 804 | { |
| 805 | return wxThreadInternal::PthreadStart((wxThread *)ptr); |
| 806 | } |
| 807 | |
| 808 | void *wxThreadInternal::PthreadStart(wxThread *thread) |
| 809 | { |
| 810 | wxThreadInternal *pthread = thread->m_internal; |
| 811 | |
| 812 | wxLogTrace(TRACE_THREADS, wxT("Thread %p started."), THR_ID(pthread)); |
| 813 | |
| 814 | // associate the thread pointer with the newly created thread so that |
| 815 | // wxThread::This() will work |
| 816 | int rc = pthread_setspecific(gs_keySelf, thread); |
| 817 | if ( rc != 0 ) |
| 818 | { |
| 819 | wxLogSysError(rc, _("Cannot start thread: error writing TLS")); |
| 820 | |
| 821 | return (void *)-1; |
| 822 | } |
| 823 | |
| 824 | // have to declare this before pthread_cleanup_push() which defines a |
| 825 | // block! |
| 826 | bool dontRunAtAll; |
| 827 | |
| 828 | #ifdef wxHAVE_PTHREAD_CLEANUP |
| 829 | // install the cleanup handler which will be called if the thread is |
| 830 | // cancelled |
| 831 | pthread_cleanup_push(wxPthreadCleanup, thread); |
| 832 | #endif // wxHAVE_PTHREAD_CLEANUP |
| 833 | |
| 834 | // wait for the semaphore to be posted from Run() |
| 835 | pthread->m_semRun.Wait(); |
| 836 | |
| 837 | // test whether we should run the run at all - may be it was deleted |
| 838 | // before it started to Run()? |
| 839 | { |
| 840 | wxCriticalSectionLocker lock(thread->m_critsect); |
| 841 | |
| 842 | dontRunAtAll = pthread->GetState() == STATE_NEW && |
| 843 | pthread->WasCancelled(); |
| 844 | } |
| 845 | |
| 846 | if ( !dontRunAtAll ) |
| 847 | { |
| 848 | // call the main entry |
| 849 | wxLogTrace(TRACE_THREADS, |
| 850 | wxT("Thread %p about to enter its Entry()."), |
| 851 | THR_ID(pthread)); |
| 852 | |
| 853 | wxTRY |
| 854 | { |
| 855 | pthread->m_exitcode = thread->Entry(); |
| 856 | |
| 857 | wxLogTrace(TRACE_THREADS, |
| 858 | wxT("Thread %p Entry() returned %lu."), |
| 859 | THR_ID(pthread), wxPtrToUInt(pthread->m_exitcode)); |
| 860 | } |
| 861 | wxCATCH_ALL( wxTheApp->OnUnhandledException(); ) |
| 862 | |
| 863 | { |
| 864 | wxCriticalSectionLocker lock(thread->m_critsect); |
| 865 | |
| 866 | // change the state of the thread to "exited" so that |
| 867 | // wxPthreadCleanup handler won't do anything from now (if it's |
| 868 | // called before we do pthread_cleanup_pop below) |
| 869 | pthread->SetState(STATE_EXITED); |
| 870 | } |
| 871 | } |
| 872 | |
| 873 | // NB: pthread_cleanup_push/pop() are macros and pop contains the matching |
| 874 | // '}' for the '{' in push, so they must be used in the same block! |
| 875 | #ifdef wxHAVE_PTHREAD_CLEANUP |
| 876 | #ifdef __DECCXX |
| 877 | // under Tru64 we get a warning from macro expansion |
| 878 | #pragma message save |
| 879 | #pragma message disable(declbutnotref) |
| 880 | #endif |
| 881 | |
| 882 | // remove the cleanup handler without executing it |
| 883 | pthread_cleanup_pop(FALSE); |
| 884 | |
| 885 | #ifdef __DECCXX |
| 886 | #pragma message restore |
| 887 | #endif |
| 888 | #endif // wxHAVE_PTHREAD_CLEANUP |
| 889 | |
| 890 | if ( dontRunAtAll ) |
| 891 | { |
| 892 | // FIXME: deleting a possibly joinable thread here??? |
| 893 | delete thread; |
| 894 | |
| 895 | return EXITCODE_CANCELLED; |
| 896 | } |
| 897 | else |
| 898 | { |
| 899 | // terminate the thread |
| 900 | thread->Exit(pthread->m_exitcode); |
| 901 | |
| 902 | wxFAIL_MSG(wxT("wxThread::Exit() can't return.")); |
| 903 | |
| 904 | return NULL; |
| 905 | } |
| 906 | } |
| 907 | |
| 908 | #ifdef wxHAVE_PTHREAD_CLEANUP |
| 909 | |
| 910 | // this handler is called when the thread is cancelled |
| 911 | extern "C" void wxPthreadCleanup(void *ptr) |
| 912 | { |
| 913 | wxThreadInternal::Cleanup((wxThread *)ptr); |
| 914 | } |
| 915 | |
| 916 | void wxThreadInternal::Cleanup(wxThread *thread) |
| 917 | { |
| 918 | if (pthread_getspecific(gs_keySelf) == 0) return; |
| 919 | { |
| 920 | wxCriticalSectionLocker lock(thread->m_critsect); |
| 921 | if ( thread->m_internal->GetState() == STATE_EXITED ) |
| 922 | { |
| 923 | // thread is already considered as finished. |
| 924 | return; |
| 925 | } |
| 926 | } |
| 927 | |
| 928 | // exit the thread gracefully |
| 929 | thread->Exit(EXITCODE_CANCELLED); |
| 930 | } |
| 931 | |
| 932 | #endif // wxHAVE_PTHREAD_CLEANUP |
| 933 | |
| 934 | // ---------------------------------------------------------------------------- |
| 935 | // wxThreadInternal |
| 936 | // ---------------------------------------------------------------------------- |
| 937 | |
| 938 | wxThreadInternal::wxThreadInternal() |
| 939 | { |
| 940 | m_state = STATE_NEW; |
| 941 | m_cancelled = false; |
| 942 | m_prio = WXTHREAD_DEFAULT_PRIORITY; |
| 943 | m_threadId = 0; |
| 944 | m_exitcode = 0; |
| 945 | |
| 946 | // set to true only when the thread starts waiting on m_semSuspend |
| 947 | m_isPaused = false; |
| 948 | |
| 949 | // defaults for joinable threads |
| 950 | m_shouldBeJoined = true; |
| 951 | m_isDetached = false; |
| 952 | } |
| 953 | |
| 954 | wxThreadInternal::~wxThreadInternal() |
| 955 | { |
| 956 | } |
| 957 | |
| 958 | wxThreadError wxThreadInternal::Run() |
| 959 | { |
| 960 | wxCHECK_MSG( GetState() == STATE_NEW, wxTHREAD_RUNNING, |
| 961 | wxT("thread may only be started once after Create()") ); |
| 962 | |
| 963 | SetState(STATE_RUNNING); |
| 964 | |
| 965 | // wake up threads waiting for our start |
| 966 | SignalRun(); |
| 967 | |
| 968 | return wxTHREAD_NO_ERROR; |
| 969 | } |
| 970 | |
| 971 | void wxThreadInternal::Wait() |
| 972 | { |
| 973 | wxCHECK_RET( !m_isDetached, wxT("can't wait for a detached thread") ); |
| 974 | |
| 975 | // if the thread we're waiting for is waiting for the GUI mutex, we will |
| 976 | // deadlock so make sure we release it temporarily |
| 977 | if ( wxThread::IsMain() ) |
| 978 | wxMutexGuiLeave(); |
| 979 | |
| 980 | wxLogTrace(TRACE_THREADS, |
| 981 | wxT("Starting to wait for thread %p to exit."), |
| 982 | THR_ID(this)); |
| 983 | |
| 984 | // to avoid memory leaks we should call pthread_join(), but it must only be |
| 985 | // done once so use a critical section to serialize the code below |
| 986 | { |
| 987 | wxCriticalSectionLocker lock(m_csJoinFlag); |
| 988 | |
| 989 | if ( m_shouldBeJoined ) |
| 990 | { |
| 991 | // FIXME shouldn't we set cancellation type to DISABLED here? If |
| 992 | // we're cancelled inside pthread_join(), things will almost |
| 993 | // certainly break - but if we disable the cancellation, we |
| 994 | // might deadlock |
| 995 | if ( pthread_join(GetId(), &m_exitcode) != 0 ) |
| 996 | { |
| 997 | // this is a serious problem, so use wxLogError and not |
| 998 | // wxLogDebug: it is possible to bring the system to its knees |
| 999 | // by creating too many threads and not joining them quite |
| 1000 | // easily |
| 1001 | wxLogError(_("Failed to join a thread, potential memory leak detected - please restart the program")); |
| 1002 | } |
| 1003 | |
| 1004 | m_shouldBeJoined = false; |
| 1005 | } |
| 1006 | } |
| 1007 | |
| 1008 | // reacquire GUI mutex |
| 1009 | if ( wxThread::IsMain() ) |
| 1010 | wxMutexGuiEnter(); |
| 1011 | } |
| 1012 | |
| 1013 | void wxThreadInternal::Pause() |
| 1014 | { |
| 1015 | // the state is set from the thread which pauses us first, this function |
| 1016 | // is called later so the state should have been already set |
| 1017 | wxCHECK_RET( m_state == STATE_PAUSED, |
| 1018 | wxT("thread must first be paused with wxThread::Pause().") ); |
| 1019 | |
| 1020 | wxLogTrace(TRACE_THREADS, |
| 1021 | wxT("Thread %p goes to sleep."), THR_ID(this)); |
| 1022 | |
| 1023 | // wait until the semaphore is Post()ed from Resume() |
| 1024 | m_semSuspend.Wait(); |
| 1025 | } |
| 1026 | |
| 1027 | void wxThreadInternal::Resume() |
| 1028 | { |
| 1029 | wxCHECK_RET( m_state == STATE_PAUSED, |
| 1030 | wxT("can't resume thread which is not suspended.") ); |
| 1031 | |
| 1032 | // the thread might be not actually paused yet - if there were no call to |
| 1033 | // TestDestroy() since the last call to Pause() for example |
| 1034 | if ( IsReallyPaused() ) |
| 1035 | { |
| 1036 | wxLogTrace(TRACE_THREADS, |
| 1037 | wxT("Waking up thread %p"), THR_ID(this)); |
| 1038 | |
| 1039 | // wake up Pause() |
| 1040 | m_semSuspend.Post(); |
| 1041 | |
| 1042 | // reset the flag |
| 1043 | SetReallyPaused(false); |
| 1044 | } |
| 1045 | else |
| 1046 | { |
| 1047 | wxLogTrace(TRACE_THREADS, |
| 1048 | wxT("Thread %p is not yet really paused"), THR_ID(this)); |
| 1049 | } |
| 1050 | |
| 1051 | SetState(STATE_RUNNING); |
| 1052 | } |
| 1053 | |
| 1054 | // ----------------------------------------------------------------------------- |
| 1055 | // wxThread static functions |
| 1056 | // ----------------------------------------------------------------------------- |
| 1057 | |
| 1058 | wxThread *wxThread::This() |
| 1059 | { |
| 1060 | return (wxThread *)pthread_getspecific(gs_keySelf); |
| 1061 | } |
| 1062 | |
| 1063 | void wxThread::Yield() |
| 1064 | { |
| 1065 | #ifdef HAVE_SCHED_YIELD |
| 1066 | sched_yield(); |
| 1067 | #endif |
| 1068 | } |
| 1069 | |
| 1070 | int wxThread::GetCPUCount() |
| 1071 | { |
| 1072 | #if defined(_SC_NPROCESSORS_ONLN) |
| 1073 | // this works for Solaris and Linux 2.6 |
| 1074 | int rc = sysconf(_SC_NPROCESSORS_ONLN); |
| 1075 | if ( rc != -1 ) |
| 1076 | { |
| 1077 | return rc; |
| 1078 | } |
| 1079 | #elif defined(__LINUX__) && wxUSE_FFILE |
| 1080 | // read from proc (can't use wxTextFile here because it's a special file: |
| 1081 | // it has 0 size but still can be read from) |
| 1082 | wxLogNull nolog; |
| 1083 | |
| 1084 | wxFFile file(wxT("/proc/cpuinfo")); |
| 1085 | if ( file.IsOpened() ) |
| 1086 | { |
| 1087 | // slurp the whole file |
| 1088 | wxString s; |
| 1089 | if ( file.ReadAll(&s) ) |
| 1090 | { |
| 1091 | // (ab)use Replace() to find the number of "processor: num" strings |
| 1092 | size_t count = s.Replace(wxT("processor\t:"), wxT("")); |
| 1093 | if ( count > 0 ) |
| 1094 | { |
| 1095 | return count; |
| 1096 | } |
| 1097 | |
| 1098 | wxLogDebug(wxT("failed to parse /proc/cpuinfo")); |
| 1099 | } |
| 1100 | else |
| 1101 | { |
| 1102 | wxLogDebug(wxT("failed to read /proc/cpuinfo")); |
| 1103 | } |
| 1104 | } |
| 1105 | #endif // different ways to get number of CPUs |
| 1106 | |
| 1107 | // unknown |
| 1108 | return -1; |
| 1109 | } |
| 1110 | |
| 1111 | wxThreadIdType wxThread::GetCurrentId() |
| 1112 | { |
| 1113 | return (wxThreadIdType)pthread_self(); |
| 1114 | } |
| 1115 | |
| 1116 | |
| 1117 | bool wxThread::SetConcurrency(size_t level) |
| 1118 | { |
| 1119 | #ifdef HAVE_THR_SETCONCURRENCY |
| 1120 | int rc = thr_setconcurrency(level); |
| 1121 | if ( rc != 0 ) |
| 1122 | { |
| 1123 | wxLogSysError(rc, wxT("thr_setconcurrency() failed")); |
| 1124 | } |
| 1125 | |
| 1126 | return rc == 0; |
| 1127 | #else // !HAVE_THR_SETCONCURRENCY |
| 1128 | // ok only for the default value |
| 1129 | return level == 0; |
| 1130 | #endif // HAVE_THR_SETCONCURRENCY/!HAVE_THR_SETCONCURRENCY |
| 1131 | } |
| 1132 | |
| 1133 | // ----------------------------------------------------------------------------- |
| 1134 | // creating thread |
| 1135 | // ----------------------------------------------------------------------------- |
| 1136 | |
| 1137 | wxThread::wxThread(wxThreadKind kind) |
| 1138 | { |
| 1139 | // add this thread to the global list of all threads |
| 1140 | { |
| 1141 | wxMutexLocker lock(*gs_mutexAllThreads); |
| 1142 | |
| 1143 | gs_allThreads.Add(this); |
| 1144 | } |
| 1145 | |
| 1146 | m_internal = new wxThreadInternal(); |
| 1147 | |
| 1148 | m_isDetached = kind == wxTHREAD_DETACHED; |
| 1149 | } |
| 1150 | |
| 1151 | #ifdef HAVE_PTHREAD_ATTR_SETSTACKSIZE |
| 1152 | #define WXUNUSED_STACKSIZE(identifier) identifier |
| 1153 | #else |
| 1154 | #define WXUNUSED_STACKSIZE(identifier) WXUNUSED(identifier) |
| 1155 | #endif |
| 1156 | |
| 1157 | wxThreadError wxThread::Create(unsigned int WXUNUSED_STACKSIZE(stackSize)) |
| 1158 | { |
| 1159 | if ( m_internal->GetState() != STATE_NEW ) |
| 1160 | { |
| 1161 | // don't recreate thread |
| 1162 | return wxTHREAD_RUNNING; |
| 1163 | } |
| 1164 | |
| 1165 | // set up the thread attribute: right now, we only set thread priority |
| 1166 | pthread_attr_t attr; |
| 1167 | pthread_attr_init(&attr); |
| 1168 | |
| 1169 | #ifdef HAVE_PTHREAD_ATTR_SETSTACKSIZE |
| 1170 | if (stackSize) |
| 1171 | pthread_attr_setstacksize(&attr, stackSize); |
| 1172 | #endif |
| 1173 | |
| 1174 | #ifdef HAVE_THREAD_PRIORITY_FUNCTIONS |
| 1175 | int policy; |
| 1176 | if ( pthread_attr_getschedpolicy(&attr, &policy) != 0 ) |
| 1177 | { |
| 1178 | wxLogError(_("Cannot retrieve thread scheduling policy.")); |
| 1179 | } |
| 1180 | |
| 1181 | #ifdef __VMS__ |
| 1182 | /* the pthread.h contains too many spaces. This is a work-around */ |
| 1183 | # undef sched_get_priority_max |
| 1184 | #undef sched_get_priority_min |
| 1185 | #define sched_get_priority_max(_pol_) \ |
| 1186 | (_pol_ == SCHED_OTHER ? PRI_FG_MAX_NP : PRI_FIFO_MAX) |
| 1187 | #define sched_get_priority_min(_pol_) \ |
| 1188 | (_pol_ == SCHED_OTHER ? PRI_FG_MIN_NP : PRI_FIFO_MIN) |
| 1189 | #endif |
| 1190 | |
| 1191 | int max_prio = sched_get_priority_max(policy), |
| 1192 | min_prio = sched_get_priority_min(policy), |
| 1193 | prio = m_internal->GetPriority(); |
| 1194 | |
| 1195 | if ( min_prio == -1 || max_prio == -1 ) |
| 1196 | { |
| 1197 | wxLogError(_("Cannot get priority range for scheduling policy %d."), |
| 1198 | policy); |
| 1199 | } |
| 1200 | else if ( max_prio == min_prio ) |
| 1201 | { |
| 1202 | if ( prio != WXTHREAD_DEFAULT_PRIORITY ) |
| 1203 | { |
| 1204 | // notify the programmer that this doesn't work here |
| 1205 | wxLogWarning(_("Thread priority setting is ignored.")); |
| 1206 | } |
| 1207 | //else: we have default priority, so don't complain |
| 1208 | |
| 1209 | // anyhow, don't do anything because priority is just ignored |
| 1210 | } |
| 1211 | else |
| 1212 | { |
| 1213 | struct sched_param sp; |
| 1214 | if ( pthread_attr_getschedparam(&attr, &sp) != 0 ) |
| 1215 | { |
| 1216 | wxFAIL_MSG(wxT("pthread_attr_getschedparam() failed")); |
| 1217 | } |
| 1218 | |
| 1219 | sp.sched_priority = min_prio + (prio*(max_prio - min_prio))/100; |
| 1220 | |
| 1221 | if ( pthread_attr_setschedparam(&attr, &sp) != 0 ) |
| 1222 | { |
| 1223 | wxFAIL_MSG(wxT("pthread_attr_setschedparam(priority) failed")); |
| 1224 | } |
| 1225 | } |
| 1226 | #endif // HAVE_THREAD_PRIORITY_FUNCTIONS |
| 1227 | |
| 1228 | #ifdef HAVE_PTHREAD_ATTR_SETSCOPE |
| 1229 | // this will make the threads created by this process really concurrent |
| 1230 | if ( pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM) != 0 ) |
| 1231 | { |
| 1232 | wxFAIL_MSG(wxT("pthread_attr_setscope(PTHREAD_SCOPE_SYSTEM) failed")); |
| 1233 | } |
| 1234 | #endif // HAVE_PTHREAD_ATTR_SETSCOPE |
| 1235 | |
| 1236 | // VZ: assume that this one is always available (it's rather fundamental), |
| 1237 | // if this function is ever missing we should try to use |
| 1238 | // pthread_detach() instead (after thread creation) |
| 1239 | if ( m_isDetached ) |
| 1240 | { |
| 1241 | if ( pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) != 0 ) |
| 1242 | { |
| 1243 | wxFAIL_MSG(wxT("pthread_attr_setdetachstate(DETACHED) failed")); |
| 1244 | } |
| 1245 | |
| 1246 | // never try to join detached threads |
| 1247 | m_internal->Detach(); |
| 1248 | } |
| 1249 | //else: threads are created joinable by default, it's ok |
| 1250 | |
| 1251 | // create the new OS thread object |
| 1252 | int rc = pthread_create |
| 1253 | ( |
| 1254 | m_internal->GetIdPtr(), |
| 1255 | &attr, |
| 1256 | wxPthreadStart, |
| 1257 | (void *)this |
| 1258 | ); |
| 1259 | |
| 1260 | if ( pthread_attr_destroy(&attr) != 0 ) |
| 1261 | { |
| 1262 | wxFAIL_MSG(wxT("pthread_attr_destroy() failed")); |
| 1263 | } |
| 1264 | |
| 1265 | if ( rc != 0 ) |
| 1266 | { |
| 1267 | m_internal->SetState(STATE_EXITED); |
| 1268 | |
| 1269 | return wxTHREAD_NO_RESOURCE; |
| 1270 | } |
| 1271 | |
| 1272 | return wxTHREAD_NO_ERROR; |
| 1273 | } |
| 1274 | |
| 1275 | wxThreadError wxThread::Run() |
| 1276 | { |
| 1277 | wxCriticalSectionLocker lock(m_critsect); |
| 1278 | |
| 1279 | wxCHECK_MSG( m_internal->GetId(), wxTHREAD_MISC_ERROR, |
| 1280 | wxT("must call wxThread::Create() first") ); |
| 1281 | |
| 1282 | return m_internal->Run(); |
| 1283 | } |
| 1284 | |
| 1285 | // ----------------------------------------------------------------------------- |
| 1286 | // misc accessors |
| 1287 | // ----------------------------------------------------------------------------- |
| 1288 | |
| 1289 | void wxThread::SetPriority(unsigned int prio) |
| 1290 | { |
| 1291 | wxCHECK_RET( ((int)WXTHREAD_MIN_PRIORITY <= (int)prio) && |
| 1292 | ((int)prio <= (int)WXTHREAD_MAX_PRIORITY), |
| 1293 | wxT("invalid thread priority") ); |
| 1294 | |
| 1295 | wxCriticalSectionLocker lock(m_critsect); |
| 1296 | |
| 1297 | switch ( m_internal->GetState() ) |
| 1298 | { |
| 1299 | case STATE_NEW: |
| 1300 | // thread not yet started, priority will be set when it is |
| 1301 | m_internal->SetPriority(prio); |
| 1302 | break; |
| 1303 | |
| 1304 | case STATE_RUNNING: |
| 1305 | case STATE_PAUSED: |
| 1306 | #ifdef HAVE_THREAD_PRIORITY_FUNCTIONS |
| 1307 | #if defined(__LINUX__) |
| 1308 | // On Linux, pthread_setschedparam with SCHED_OTHER does not allow |
| 1309 | // a priority other than 0. Instead, we use the BSD setpriority |
| 1310 | // which alllows us to set a 'nice' value between 20 to -20. Only |
| 1311 | // super user can set a value less than zero (more negative yields |
| 1312 | // higher priority). setpriority set the static priority of a |
| 1313 | // process, but this is OK since Linux is configured as a thread |
| 1314 | // per process. |
| 1315 | // |
| 1316 | // FIXME this is not true for 2.6!! |
| 1317 | |
| 1318 | // map wx priorites WXTHREAD_MIN_PRIORITY..WXTHREAD_MAX_PRIORITY |
| 1319 | // to Unix priorities 20..-20 |
| 1320 | if ( setpriority(PRIO_PROCESS, 0, -(2*(int)prio)/5 + 20) == -1 ) |
| 1321 | { |
| 1322 | wxLogError(_("Failed to set thread priority %d."), prio); |
| 1323 | } |
| 1324 | #else // __LINUX__ |
| 1325 | { |
| 1326 | struct sched_param sparam; |
| 1327 | sparam.sched_priority = prio; |
| 1328 | |
| 1329 | if ( pthread_setschedparam(m_internal->GetId(), |
| 1330 | SCHED_OTHER, &sparam) != 0 ) |
| 1331 | { |
| 1332 | wxLogError(_("Failed to set thread priority %d."), prio); |
| 1333 | } |
| 1334 | } |
| 1335 | #endif // __LINUX__ |
| 1336 | #endif // HAVE_THREAD_PRIORITY_FUNCTIONS |
| 1337 | break; |
| 1338 | |
| 1339 | case STATE_EXITED: |
| 1340 | default: |
| 1341 | wxFAIL_MSG(wxT("impossible to set thread priority in this state")); |
| 1342 | } |
| 1343 | } |
| 1344 | |
| 1345 | unsigned int wxThread::GetPriority() const |
| 1346 | { |
| 1347 | wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect); |
| 1348 | |
| 1349 | return m_internal->GetPriority(); |
| 1350 | } |
| 1351 | |
| 1352 | wxThreadIdType wxThread::GetId() const |
| 1353 | { |
| 1354 | return (wxThreadIdType) m_internal->GetId(); |
| 1355 | } |
| 1356 | |
| 1357 | // ----------------------------------------------------------------------------- |
| 1358 | // pause/resume |
| 1359 | // ----------------------------------------------------------------------------- |
| 1360 | |
| 1361 | wxThreadError wxThread::Pause() |
| 1362 | { |
| 1363 | wxCHECK_MSG( This() != this, wxTHREAD_MISC_ERROR, |
| 1364 | wxT("a thread can't pause itself") ); |
| 1365 | |
| 1366 | wxCriticalSectionLocker lock(m_critsect); |
| 1367 | |
| 1368 | if ( m_internal->GetState() != STATE_RUNNING ) |
| 1369 | { |
| 1370 | wxLogDebug(wxT("Can't pause thread which is not running.")); |
| 1371 | |
| 1372 | return wxTHREAD_NOT_RUNNING; |
| 1373 | } |
| 1374 | |
| 1375 | // just set a flag, the thread will be really paused only during the next |
| 1376 | // call to TestDestroy() |
| 1377 | m_internal->SetState(STATE_PAUSED); |
| 1378 | |
| 1379 | return wxTHREAD_NO_ERROR; |
| 1380 | } |
| 1381 | |
| 1382 | wxThreadError wxThread::Resume() |
| 1383 | { |
| 1384 | wxCHECK_MSG( This() != this, wxTHREAD_MISC_ERROR, |
| 1385 | wxT("a thread can't resume itself") ); |
| 1386 | |
| 1387 | wxCriticalSectionLocker lock(m_critsect); |
| 1388 | |
| 1389 | wxThreadState state = m_internal->GetState(); |
| 1390 | |
| 1391 | switch ( state ) |
| 1392 | { |
| 1393 | case STATE_PAUSED: |
| 1394 | wxLogTrace(TRACE_THREADS, wxT("Thread %p suspended, resuming."), |
| 1395 | GetId()); |
| 1396 | |
| 1397 | m_internal->Resume(); |
| 1398 | |
| 1399 | return wxTHREAD_NO_ERROR; |
| 1400 | |
| 1401 | case STATE_EXITED: |
| 1402 | wxLogTrace(TRACE_THREADS, wxT("Thread %p exited, won't resume."), |
| 1403 | GetId()); |
| 1404 | return wxTHREAD_NO_ERROR; |
| 1405 | |
| 1406 | default: |
| 1407 | wxLogDebug(wxT("Attempt to resume a thread which is not paused.")); |
| 1408 | |
| 1409 | return wxTHREAD_MISC_ERROR; |
| 1410 | } |
| 1411 | } |
| 1412 | |
| 1413 | // ----------------------------------------------------------------------------- |
| 1414 | // exiting thread |
| 1415 | // ----------------------------------------------------------------------------- |
| 1416 | |
| 1417 | wxThread::ExitCode wxThread::Wait() |
| 1418 | { |
| 1419 | wxCHECK_MSG( This() != this, (ExitCode)-1, |
| 1420 | wxT("a thread can't wait for itself") ); |
| 1421 | |
| 1422 | wxCHECK_MSG( !m_isDetached, (ExitCode)-1, |
| 1423 | wxT("can't wait for detached thread") ); |
| 1424 | |
| 1425 | m_internal->Wait(); |
| 1426 | |
| 1427 | return m_internal->GetExitCode(); |
| 1428 | } |
| 1429 | |
| 1430 | wxThreadError wxThread::Delete(ExitCode *rc) |
| 1431 | { |
| 1432 | wxCHECK_MSG( This() != this, wxTHREAD_MISC_ERROR, |
| 1433 | wxT("a thread can't delete itself") ); |
| 1434 | |
| 1435 | bool isDetached = m_isDetached; |
| 1436 | |
| 1437 | m_critsect.Enter(); |
| 1438 | wxThreadState state = m_internal->GetState(); |
| 1439 | |
| 1440 | // ask the thread to stop |
| 1441 | m_internal->SetCancelFlag(); |
| 1442 | |
| 1443 | m_critsect.Leave(); |
| 1444 | |
| 1445 | switch ( state ) |
| 1446 | { |
| 1447 | case STATE_NEW: |
| 1448 | // we need to wake up the thread so that PthreadStart() will |
| 1449 | // terminate - right now it's blocking on run semaphore in |
| 1450 | // PthreadStart() |
| 1451 | m_internal->SignalRun(); |
| 1452 | |
| 1453 | // fall through |
| 1454 | |
| 1455 | case STATE_EXITED: |
| 1456 | // nothing to do |
| 1457 | break; |
| 1458 | |
| 1459 | case STATE_PAUSED: |
| 1460 | // resume the thread first |
| 1461 | m_internal->Resume(); |
| 1462 | |
| 1463 | // fall through |
| 1464 | |
| 1465 | default: |
| 1466 | if ( !isDetached ) |
| 1467 | { |
| 1468 | // wait until the thread stops |
| 1469 | m_internal->Wait(); |
| 1470 | |
| 1471 | if ( rc ) |
| 1472 | { |
| 1473 | // return the exit code of the thread |
| 1474 | *rc = m_internal->GetExitCode(); |
| 1475 | } |
| 1476 | } |
| 1477 | //else: can't wait for detached threads |
| 1478 | } |
| 1479 | |
| 1480 | return wxTHREAD_NO_ERROR; |
| 1481 | } |
| 1482 | |
| 1483 | wxThreadError wxThread::Kill() |
| 1484 | { |
| 1485 | wxCHECK_MSG( This() != this, wxTHREAD_MISC_ERROR, |
| 1486 | wxT("a thread can't kill itself") ); |
| 1487 | |
| 1488 | switch ( m_internal->GetState() ) |
| 1489 | { |
| 1490 | case STATE_NEW: |
| 1491 | case STATE_EXITED: |
| 1492 | return wxTHREAD_NOT_RUNNING; |
| 1493 | |
| 1494 | case STATE_PAUSED: |
| 1495 | // resume the thread first |
| 1496 | Resume(); |
| 1497 | |
| 1498 | // fall through |
| 1499 | |
| 1500 | default: |
| 1501 | #ifdef HAVE_PTHREAD_CANCEL |
| 1502 | if ( pthread_cancel(m_internal->GetId()) != 0 ) |
| 1503 | #endif // HAVE_PTHREAD_CANCEL |
| 1504 | { |
| 1505 | wxLogError(_("Failed to terminate a thread.")); |
| 1506 | |
| 1507 | return wxTHREAD_MISC_ERROR; |
| 1508 | } |
| 1509 | |
| 1510 | #ifdef HAVE_PTHREAD_CANCEL |
| 1511 | if ( m_isDetached ) |
| 1512 | { |
| 1513 | // if we use cleanup function, this will be done from |
| 1514 | // wxPthreadCleanup() |
| 1515 | #ifndef wxHAVE_PTHREAD_CLEANUP |
| 1516 | ScheduleThreadForDeletion(); |
| 1517 | |
| 1518 | // don't call OnExit() here, it can only be called in the |
| 1519 | // threads context and we're in the context of another thread |
| 1520 | |
| 1521 | DeleteThread(this); |
| 1522 | #endif // wxHAVE_PTHREAD_CLEANUP |
| 1523 | } |
| 1524 | else |
| 1525 | { |
| 1526 | m_internal->SetExitCode(EXITCODE_CANCELLED); |
| 1527 | } |
| 1528 | |
| 1529 | return wxTHREAD_NO_ERROR; |
| 1530 | #endif // HAVE_PTHREAD_CANCEL |
| 1531 | } |
| 1532 | } |
| 1533 | |
| 1534 | void wxThread::Exit(ExitCode status) |
| 1535 | { |
| 1536 | wxASSERT_MSG( This() == this, |
| 1537 | wxT("wxThread::Exit() can only be called in the context of the same thread") ); |
| 1538 | |
| 1539 | if ( m_isDetached ) |
| 1540 | { |
| 1541 | // from the moment we call OnExit(), the main program may terminate at |
| 1542 | // any moment, so mark this thread as being already in process of being |
| 1543 | // deleted or wxThreadModule::OnExit() will try to delete it again |
| 1544 | ScheduleThreadForDeletion(); |
| 1545 | } |
| 1546 | |
| 1547 | // don't enter m_critsect before calling OnExit() because the user code |
| 1548 | // might deadlock if, for example, it signals a condition in OnExit() (a |
| 1549 | // common case) while the main thread calls any of functions entering |
| 1550 | // m_critsect on us (almost all of them do) |
| 1551 | wxTRY |
| 1552 | { |
| 1553 | OnExit(); |
| 1554 | } |
| 1555 | wxCATCH_ALL( wxTheApp->OnUnhandledException(); ) |
| 1556 | |
| 1557 | // delete C++ thread object if this is a detached thread - user is |
| 1558 | // responsible for doing this for joinable ones |
| 1559 | if ( m_isDetached ) |
| 1560 | { |
| 1561 | // FIXME I'm feeling bad about it - what if another thread function is |
| 1562 | // called (in another thread context) now? It will try to access |
| 1563 | // half destroyed object which will probably result in something |
| 1564 | // very bad - but we can't protect this by a crit section unless |
| 1565 | // we make it a global object, but this would mean that we can |
| 1566 | // only call one thread function at a time :-( |
| 1567 | DeleteThread(this); |
| 1568 | pthread_setspecific(gs_keySelf, 0); |
| 1569 | } |
| 1570 | else |
| 1571 | { |
| 1572 | m_critsect.Enter(); |
| 1573 | m_internal->SetState(STATE_EXITED); |
| 1574 | m_critsect.Leave(); |
| 1575 | } |
| 1576 | |
| 1577 | // terminate the thread (pthread_exit() never returns) |
| 1578 | pthread_exit(status); |
| 1579 | |
| 1580 | wxFAIL_MSG(wxT("pthread_exit() failed")); |
| 1581 | } |
| 1582 | |
| 1583 | // also test whether we were paused |
| 1584 | bool wxThread::TestDestroy() |
| 1585 | { |
| 1586 | wxASSERT_MSG( This() == this, |
| 1587 | wxT("wxThread::TestDestroy() can only be called in the context of the same thread") ); |
| 1588 | |
| 1589 | m_critsect.Enter(); |
| 1590 | |
| 1591 | if ( m_internal->GetState() == STATE_PAUSED ) |
| 1592 | { |
| 1593 | m_internal->SetReallyPaused(true); |
| 1594 | |
| 1595 | // leave the crit section or the other threads will stop too if they |
| 1596 | // try to call any of (seemingly harmless) IsXXX() functions while we |
| 1597 | // sleep |
| 1598 | m_critsect.Leave(); |
| 1599 | |
| 1600 | m_internal->Pause(); |
| 1601 | } |
| 1602 | else |
| 1603 | { |
| 1604 | // thread wasn't requested to pause, nothing to do |
| 1605 | m_critsect.Leave(); |
| 1606 | } |
| 1607 | |
| 1608 | return m_internal->WasCancelled(); |
| 1609 | } |
| 1610 | |
| 1611 | wxThread::~wxThread() |
| 1612 | { |
| 1613 | m_critsect.Enter(); |
| 1614 | |
| 1615 | // check that the thread either exited or couldn't be created |
| 1616 | if ( m_internal->GetState() != STATE_EXITED && |
| 1617 | m_internal->GetState() != STATE_NEW ) |
| 1618 | { |
| 1619 | wxLogDebug(wxT("The thread %ld is being destroyed although it is still running! The application may crash."), |
| 1620 | (long)GetId()); |
| 1621 | } |
| 1622 | |
| 1623 | m_critsect.Leave(); |
| 1624 | |
| 1625 | delete m_internal; |
| 1626 | |
| 1627 | // remove this thread from the global array |
| 1628 | { |
| 1629 | wxMutexLocker lock(*gs_mutexAllThreads); |
| 1630 | |
| 1631 | gs_allThreads.Remove(this); |
| 1632 | } |
| 1633 | } |
| 1634 | |
| 1635 | // ----------------------------------------------------------------------------- |
| 1636 | // state tests |
| 1637 | // ----------------------------------------------------------------------------- |
| 1638 | |
| 1639 | bool wxThread::IsRunning() const |
| 1640 | { |
| 1641 | wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect); |
| 1642 | |
| 1643 | return m_internal->GetState() == STATE_RUNNING; |
| 1644 | } |
| 1645 | |
| 1646 | bool wxThread::IsAlive() const |
| 1647 | { |
| 1648 | wxCriticalSectionLocker lock((wxCriticalSection&)m_critsect); |
| 1649 | |
| 1650 | switch ( m_internal->GetState() ) |
| 1651 | { |
| 1652 | case STATE_RUNNING: |
| 1653 | case STATE_PAUSED: |
| 1654 | return true; |
| 1655 | |
| 1656 | default: |
| 1657 | return false; |
| 1658 | } |
| 1659 | } |
| 1660 | |
| 1661 | bool wxThread::IsPaused() const |
| 1662 | { |
| 1663 | wxCriticalSectionLocker lock((wxCriticalSection&)m_critsect); |
| 1664 | |
| 1665 | return (m_internal->GetState() == STATE_PAUSED); |
| 1666 | } |
| 1667 | |
| 1668 | //-------------------------------------------------------------------- |
| 1669 | // wxThreadModule |
| 1670 | //-------------------------------------------------------------------- |
| 1671 | |
| 1672 | class wxThreadModule : public wxModule |
| 1673 | { |
| 1674 | public: |
| 1675 | virtual bool OnInit(); |
| 1676 | virtual void OnExit(); |
| 1677 | |
| 1678 | private: |
| 1679 | DECLARE_DYNAMIC_CLASS(wxThreadModule) |
| 1680 | }; |
| 1681 | |
| 1682 | IMPLEMENT_DYNAMIC_CLASS(wxThreadModule, wxModule) |
| 1683 | |
| 1684 | bool wxThreadModule::OnInit() |
| 1685 | { |
| 1686 | int rc = pthread_key_create(&gs_keySelf, NULL /* dtor function */); |
| 1687 | if ( rc != 0 ) |
| 1688 | { |
| 1689 | wxLogSysError(rc, _("Thread module initialization failed: failed to create thread key")); |
| 1690 | |
| 1691 | return false; |
| 1692 | } |
| 1693 | |
| 1694 | wxThread::ms_idMainThread = wxThread::GetCurrentId(); |
| 1695 | |
| 1696 | gs_mutexAllThreads = new wxMutex(); |
| 1697 | |
| 1698 | gs_mutexGui = new wxMutex(); |
| 1699 | gs_mutexGui->Lock(); |
| 1700 | |
| 1701 | gs_mutexDeleteThread = new wxMutex(); |
| 1702 | gs_condAllDeleted = new wxCondition(*gs_mutexDeleteThread); |
| 1703 | |
| 1704 | return true; |
| 1705 | } |
| 1706 | |
| 1707 | void wxThreadModule::OnExit() |
| 1708 | { |
| 1709 | wxASSERT_MSG( wxThread::IsMain(), wxT("only main thread can be here") ); |
| 1710 | |
| 1711 | // are there any threads left which are being deleted right now? |
| 1712 | size_t nThreadsBeingDeleted; |
| 1713 | |
| 1714 | { |
| 1715 | wxMutexLocker lock( *gs_mutexDeleteThread ); |
| 1716 | nThreadsBeingDeleted = gs_nThreadsBeingDeleted; |
| 1717 | |
| 1718 | if ( nThreadsBeingDeleted > 0 ) |
| 1719 | { |
| 1720 | wxLogTrace(TRACE_THREADS, |
| 1721 | wxT("Waiting for %lu threads to disappear"), |
| 1722 | (unsigned long)nThreadsBeingDeleted); |
| 1723 | |
| 1724 | // have to wait until all of them disappear |
| 1725 | gs_condAllDeleted->Wait(); |
| 1726 | } |
| 1727 | } |
| 1728 | |
| 1729 | size_t count; |
| 1730 | |
| 1731 | { |
| 1732 | wxMutexLocker lock(*gs_mutexAllThreads); |
| 1733 | |
| 1734 | // terminate any threads left |
| 1735 | count = gs_allThreads.GetCount(); |
| 1736 | if ( count != 0u ) |
| 1737 | { |
| 1738 | wxLogDebug(wxT("%lu threads were not terminated by the application."), |
| 1739 | (unsigned long)count); |
| 1740 | } |
| 1741 | } // unlock mutex before deleting the threads as they lock it in their dtor |
| 1742 | |
| 1743 | for ( size_t n = 0u; n < count; n++ ) |
| 1744 | { |
| 1745 | // Delete calls the destructor which removes the current entry. We |
| 1746 | // should only delete the first one each time. |
| 1747 | gs_allThreads[0]->Delete(); |
| 1748 | } |
| 1749 | |
| 1750 | delete gs_mutexAllThreads; |
| 1751 | |
| 1752 | // destroy GUI mutex |
| 1753 | gs_mutexGui->Unlock(); |
| 1754 | delete gs_mutexGui; |
| 1755 | |
| 1756 | // and free TLD slot |
| 1757 | (void)pthread_key_delete(gs_keySelf); |
| 1758 | |
| 1759 | delete gs_condAllDeleted; |
| 1760 | delete gs_mutexDeleteThread; |
| 1761 | } |
| 1762 | |
| 1763 | // ---------------------------------------------------------------------------- |
| 1764 | // global functions |
| 1765 | // ---------------------------------------------------------------------------- |
| 1766 | |
| 1767 | static void ScheduleThreadForDeletion() |
| 1768 | { |
| 1769 | wxMutexLocker lock( *gs_mutexDeleteThread ); |
| 1770 | |
| 1771 | gs_nThreadsBeingDeleted++; |
| 1772 | |
| 1773 | wxLogTrace(TRACE_THREADS, wxT("%lu thread%s waiting to be deleted"), |
| 1774 | (unsigned long)gs_nThreadsBeingDeleted, |
| 1775 | gs_nThreadsBeingDeleted == 1 ? wxT("") : wxT("s")); |
| 1776 | } |
| 1777 | |
| 1778 | static void DeleteThread(wxThread *This) |
| 1779 | { |
| 1780 | wxLogTrace(TRACE_THREADS, wxT("Thread %p auto deletes."), This->GetId()); |
| 1781 | |
| 1782 | delete This; |
| 1783 | |
| 1784 | // only lock gs_mutexDeleteThread after deleting the thread to avoid |
| 1785 | // calling out into user code with it locked as this may result in |
| 1786 | // deadlocks if the thread dtor deletes another thread (see #11501) |
| 1787 | wxMutexLocker locker( *gs_mutexDeleteThread ); |
| 1788 | |
| 1789 | wxCHECK_RET( gs_nThreadsBeingDeleted > 0, |
| 1790 | wxT("no threads scheduled for deletion, yet we delete one?") ); |
| 1791 | |
| 1792 | wxLogTrace(TRACE_THREADS, wxT("%lu threads remain scheduled for deletion."), |
| 1793 | (unsigned long)gs_nThreadsBeingDeleted - 1); |
| 1794 | |
| 1795 | if ( !--gs_nThreadsBeingDeleted ) |
| 1796 | { |
| 1797 | // no more threads left, signal it |
| 1798 | gs_condAllDeleted->Signal(); |
| 1799 | } |
| 1800 | } |
| 1801 | |
| 1802 | void wxMutexGuiEnterImpl() |
| 1803 | { |
| 1804 | gs_mutexGui->Lock(); |
| 1805 | } |
| 1806 | |
| 1807 | void wxMutexGuiLeaveImpl() |
| 1808 | { |
| 1809 | gs_mutexGui->Unlock(); |
| 1810 | } |
| 1811 | |
| 1812 | // ---------------------------------------------------------------------------- |
| 1813 | // include common implementation code |
| 1814 | // ---------------------------------------------------------------------------- |
| 1815 | |
| 1816 | #include "wx/thrimpl.cpp" |
| 1817 | |
| 1818 | #endif // wxUSE_THREADS |