| 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 | #ifdef HAVE_SCHED_H |
| 49 | #include <sched.h> |
| 50 | #endif |
| 51 | |
| 52 | #ifdef HAVE_THR_SETCONCURRENCY |
| 53 | #include <thread.h> |
| 54 | #endif |
| 55 | |
| 56 | // we use wxFFile under Linux in GetCPUCount() |
| 57 | #ifdef __LINUX__ |
| 58 | #include "wx/ffile.h" |
| 59 | // For setpriority. |
| 60 | #include <sys/time.h> |
| 61 | #include <sys/resource.h> |
| 62 | #endif |
| 63 | |
| 64 | #ifdef __VMS |
| 65 | #define THR_ID(thr) ((long long)(thr)->GetId()) |
| 66 | #else |
| 67 | #define THR_ID(thr) ((long)(thr)->GetId()) |
| 68 | #endif |
| 69 | |
| 70 | // ---------------------------------------------------------------------------- |
| 71 | // constants |
| 72 | // ---------------------------------------------------------------------------- |
| 73 | |
| 74 | // the possible states of the thread and transitions from them |
| 75 | enum wxThreadState |
| 76 | { |
| 77 | STATE_NEW, // didn't start execution yet (=> RUNNING) |
| 78 | STATE_RUNNING, // running (=> PAUSED or EXITED) |
| 79 | STATE_PAUSED, // suspended (=> RUNNING or EXITED) |
| 80 | STATE_EXITED // thread doesn't exist any more |
| 81 | }; |
| 82 | |
| 83 | // the exit value of a thread which has been cancelled |
| 84 | static const wxThread::ExitCode EXITCODE_CANCELLED = (wxThread::ExitCode)-1; |
| 85 | |
| 86 | // trace mask for wxThread operations |
| 87 | #define TRACE_THREADS _T("thread") |
| 88 | |
| 89 | // you can get additional debugging messages for the semaphore operations |
| 90 | #define TRACE_SEMA _T("semaphore") |
| 91 | |
| 92 | // ---------------------------------------------------------------------------- |
| 93 | // private functions |
| 94 | // ---------------------------------------------------------------------------- |
| 95 | |
| 96 | static void ScheduleThreadForDeletion(); |
| 97 | static void DeleteThread(wxThread *This); |
| 98 | |
| 99 | // ---------------------------------------------------------------------------- |
| 100 | // private classes |
| 101 | // ---------------------------------------------------------------------------- |
| 102 | |
| 103 | // an (non owning) array of pointers to threads |
| 104 | WX_DEFINE_ARRAY_PTR(wxThread *, wxArrayThread); |
| 105 | |
| 106 | // an entry for a thread we can wait for |
| 107 | |
| 108 | // ----------------------------------------------------------------------------- |
| 109 | // global data |
| 110 | // ----------------------------------------------------------------------------- |
| 111 | |
| 112 | // we keep the list of all threads created by the application to be able to |
| 113 | // terminate them on exit if there are some left - otherwise the process would |
| 114 | // be left in memory |
| 115 | static wxArrayThread gs_allThreads; |
| 116 | |
| 117 | // a mutex to protect gs_allThreads |
| 118 | static wxMutex *gs_mutexAllThreads = NULL; |
| 119 | |
| 120 | // the id of the main thread |
| 121 | static pthread_t gs_tidMain = (pthread_t)-1; |
| 122 | |
| 123 | // the key for the pointer to the associated wxThread object |
| 124 | static pthread_key_t gs_keySelf; |
| 125 | |
| 126 | // the number of threads which are being deleted - the program won't exit |
| 127 | // until there are any left |
| 128 | static size_t gs_nThreadsBeingDeleted = 0; |
| 129 | |
| 130 | // a mutex to protect gs_nThreadsBeingDeleted |
| 131 | static wxMutex *gs_mutexDeleteThread = (wxMutex *)NULL; |
| 132 | |
| 133 | // and a condition variable which will be signaled when all |
| 134 | // gs_nThreadsBeingDeleted will have been deleted |
| 135 | static wxCondition *gs_condAllDeleted = (wxCondition *)NULL; |
| 136 | |
| 137 | // this mutex must be acquired before any call to a GUI function |
| 138 | // (it's not inside #if wxUSE_GUI because this file is compiled as part |
| 139 | // of wxBase) |
| 140 | static wxMutex *gs_mutexGui = NULL; |
| 141 | |
| 142 | // when we wait for a thread to exit, we're blocking on a condition which the |
| 143 | // thread signals in its SignalExit() method -- but this condition can't be a |
| 144 | // member of the thread itself as a detached thread may delete itself at any |
| 145 | // moment and accessing the condition member of the thread after this would |
| 146 | // result in a disaster |
| 147 | // |
| 148 | // so instead we maintain a global list of the structs below for the threads |
| 149 | // we're interested in waiting on |
| 150 | |
| 151 | // ============================================================================ |
| 152 | // wxMutex implementation |
| 153 | // ============================================================================ |
| 154 | |
| 155 | // ---------------------------------------------------------------------------- |
| 156 | // wxMutexInternal |
| 157 | // ---------------------------------------------------------------------------- |
| 158 | |
| 159 | // this is a simple wrapper around pthread_mutex_t which provides error |
| 160 | // checking |
| 161 | class wxMutexInternal |
| 162 | { |
| 163 | public: |
| 164 | wxMutexInternal(wxMutexType mutexType); |
| 165 | ~wxMutexInternal(); |
| 166 | |
| 167 | wxMutexError Lock(); |
| 168 | wxMutexError Lock(unsigned long ms); |
| 169 | wxMutexError TryLock(); |
| 170 | wxMutexError Unlock(); |
| 171 | |
| 172 | bool IsOk() const { return m_isOk; } |
| 173 | |
| 174 | private: |
| 175 | // convert the result of pthread_mutex_[timed]lock() call to wx return code |
| 176 | wxMutexError HandleLockResult(int err); |
| 177 | |
| 178 | private: |
| 179 | pthread_mutex_t m_mutex; |
| 180 | bool m_isOk; |
| 181 | wxMutexType m_type; |
| 182 | unsigned long m_owningThread; |
| 183 | |
| 184 | // wxConditionInternal uses our m_mutex |
| 185 | friend class wxConditionInternal; |
| 186 | }; |
| 187 | |
| 188 | #if defined(HAVE_PTHREAD_MUTEXATTR_T) && \ |
| 189 | wxUSE_UNIX && !defined(HAVE_PTHREAD_MUTEXATTR_SETTYPE_DECL) |
| 190 | // on some systems pthread_mutexattr_settype() is not in the headers (but it is |
| 191 | // in the library, otherwise we wouldn't compile this code at all) |
| 192 | extern "C" int pthread_mutexattr_settype(pthread_mutexattr_t *, int); |
| 193 | #endif |
| 194 | |
| 195 | wxMutexInternal::wxMutexInternal(wxMutexType mutexType) |
| 196 | { |
| 197 | m_type = mutexType; |
| 198 | m_owningThread = 0; |
| 199 | |
| 200 | int err; |
| 201 | switch ( mutexType ) |
| 202 | { |
| 203 | case wxMUTEX_RECURSIVE: |
| 204 | // support recursive locks like Win32, i.e. a thread can lock a |
| 205 | // mutex which it had itself already locked |
| 206 | // |
| 207 | // unfortunately initialization of recursive mutexes is non |
| 208 | // portable, so try several methods |
| 209 | #ifdef HAVE_PTHREAD_MUTEXATTR_T |
| 210 | { |
| 211 | pthread_mutexattr_t attr; |
| 212 | pthread_mutexattr_init(&attr); |
| 213 | pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE); |
| 214 | |
| 215 | err = pthread_mutex_init(&m_mutex, &attr); |
| 216 | } |
| 217 | #elif defined(HAVE_PTHREAD_RECURSIVE_MUTEX_INITIALIZER) |
| 218 | // we can use this only as initializer so we have to assign it |
| 219 | // first to a temp var - assigning directly to m_mutex wouldn't |
| 220 | // even compile |
| 221 | { |
| 222 | pthread_mutex_t mutex = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP; |
| 223 | m_mutex = mutex; |
| 224 | } |
| 225 | #else // no recursive mutexes |
| 226 | err = EINVAL; |
| 227 | #endif // HAVE_PTHREAD_MUTEXATTR_T/... |
| 228 | break; |
| 229 | |
| 230 | default: |
| 231 | wxFAIL_MSG( _T("unknown mutex type") ); |
| 232 | // fall through |
| 233 | |
| 234 | case wxMUTEX_DEFAULT: |
| 235 | err = pthread_mutex_init(&m_mutex, NULL); |
| 236 | break; |
| 237 | } |
| 238 | |
| 239 | m_isOk = err == 0; |
| 240 | if ( !m_isOk ) |
| 241 | { |
| 242 | wxLogApiError( wxT("pthread_mutex_init()"), err); |
| 243 | } |
| 244 | } |
| 245 | |
| 246 | wxMutexInternal::~wxMutexInternal() |
| 247 | { |
| 248 | if ( m_isOk ) |
| 249 | { |
| 250 | int err = pthread_mutex_destroy(&m_mutex); |
| 251 | if ( err != 0 ) |
| 252 | { |
| 253 | wxLogApiError( wxT("pthread_mutex_destroy()"), err); |
| 254 | } |
| 255 | } |
| 256 | } |
| 257 | |
| 258 | wxMutexError wxMutexInternal::Lock() |
| 259 | { |
| 260 | if ((m_type == wxMUTEX_DEFAULT) && (m_owningThread != 0)) |
| 261 | { |
| 262 | if (m_owningThread == wxThread::GetCurrentId()) |
| 263 | return wxMUTEX_DEAD_LOCK; |
| 264 | } |
| 265 | |
| 266 | return HandleLockResult(pthread_mutex_lock(&m_mutex)); |
| 267 | } |
| 268 | |
| 269 | wxMutexError wxMutexInternal::Lock(unsigned long ms) |
| 270 | { |
| 271 | #ifdef HAVE_PTHREAD_MUTEX_TIMEDLOCK |
| 272 | static const long MSEC_IN_SEC = 1000; |
| 273 | static const long NSEC_IN_MSEC = 1000000; |
| 274 | static const long NSEC_IN_USEC = 1000; |
| 275 | static const long NSEC_IN_SEC = MSEC_IN_SEC * NSEC_IN_MSEC; |
| 276 | |
| 277 | time_t seconds = ms/MSEC_IN_SEC; |
| 278 | long nanoseconds = (ms % MSEC_IN_SEC) * NSEC_IN_MSEC; |
| 279 | timespec ts = { 0, 0 }; |
| 280 | |
| 281 | // normally we should use clock_gettime(CLOCK_REALTIME) here but this |
| 282 | // function is in librt and we don't link with it currently, so use |
| 283 | // gettimeofday() instead -- if it turns out that this is really too |
| 284 | // imprecise, we should modify configure to check if clock_gettime() is |
| 285 | // available and whether it requires -lrt and use it instead |
| 286 | #if 0 |
| 287 | if ( clock_gettime(CLOCK_REALTIME, &ts) == 0 ) |
| 288 | { |
| 289 | } |
| 290 | #else |
| 291 | struct timeval tv; |
| 292 | if ( wxGetTimeOfDay(&tv) != -1 ) |
| 293 | { |
| 294 | ts.tv_sec = tv.tv_sec; |
| 295 | ts.tv_nsec = tv.tv_usec*NSEC_IN_USEC; |
| 296 | } |
| 297 | #endif |
| 298 | else // fall back on system timer |
| 299 | { |
| 300 | ts.tv_sec = time(NULL); |
| 301 | } |
| 302 | |
| 303 | ts.tv_sec += seconds; |
| 304 | ts.tv_nsec += nanoseconds; |
| 305 | if ( ts.tv_nsec > NSEC_IN_SEC ) |
| 306 | { |
| 307 | ts.tv_sec += 1; |
| 308 | ts.tv_nsec -= NSEC_IN_SEC; |
| 309 | } |
| 310 | |
| 311 | return HandleLockResult(pthread_mutex_timedlock(&m_mutex, &ts)); |
| 312 | #else // !HAVE_PTHREAD_MUTEX_TIMEDLOCK |
| 313 | wxUnusedVar(ms); |
| 314 | |
| 315 | return wxMUTEX_MISC_ERROR; |
| 316 | #endif // HAVE_PTHREAD_MUTEX_TIMEDLOCK/!HAVE_PTHREAD_MUTEX_TIMEDLOCK |
| 317 | } |
| 318 | |
| 319 | wxMutexError wxMutexInternal::HandleLockResult(int err) |
| 320 | { |
| 321 | // wxPrintf( "err %d\n", err ); |
| 322 | |
| 323 | switch ( err ) |
| 324 | { |
| 325 | case EDEADLK: |
| 326 | // only error checking mutexes return this value and so it's an |
| 327 | // unexpected situation -- hence use assert, not wxLogDebug |
| 328 | wxFAIL_MSG( _T("mutex deadlock prevented") ); |
| 329 | return wxMUTEX_DEAD_LOCK; |
| 330 | |
| 331 | case EINVAL: |
| 332 | wxLogDebug(_T("pthread_mutex_[timed]lock(): mutex not initialized")); |
| 333 | break; |
| 334 | |
| 335 | case ETIMEDOUT: |
| 336 | return wxMUTEX_TIMEOUT; |
| 337 | |
| 338 | case 0: |
| 339 | if (m_type == wxMUTEX_DEFAULT) |
| 340 | m_owningThread = wxThread::GetCurrentId(); |
| 341 | return wxMUTEX_NO_ERROR; |
| 342 | |
| 343 | default: |
| 344 | wxLogApiError(_T("pthread_mutex_[timed]lock()"), err); |
| 345 | } |
| 346 | |
| 347 | return wxMUTEX_MISC_ERROR; |
| 348 | } |
| 349 | |
| 350 | |
| 351 | wxMutexError wxMutexInternal::TryLock() |
| 352 | { |
| 353 | int err = pthread_mutex_trylock(&m_mutex); |
| 354 | switch ( err ) |
| 355 | { |
| 356 | case EBUSY: |
| 357 | // not an error: mutex is already locked, but we're prepared for |
| 358 | // this |
| 359 | return wxMUTEX_BUSY; |
| 360 | |
| 361 | case EINVAL: |
| 362 | wxLogDebug(_T("pthread_mutex_trylock(): mutex not initialized.")); |
| 363 | break; |
| 364 | |
| 365 | case 0: |
| 366 | if (m_type == wxMUTEX_DEFAULT) |
| 367 | m_owningThread = wxThread::GetCurrentId(); |
| 368 | return wxMUTEX_NO_ERROR; |
| 369 | |
| 370 | default: |
| 371 | wxLogApiError(_T("pthread_mutex_trylock()"), err); |
| 372 | } |
| 373 | |
| 374 | return wxMUTEX_MISC_ERROR; |
| 375 | } |
| 376 | |
| 377 | wxMutexError wxMutexInternal::Unlock() |
| 378 | { |
| 379 | m_owningThread = 0; |
| 380 | |
| 381 | int err = pthread_mutex_unlock(&m_mutex); |
| 382 | switch ( err ) |
| 383 | { |
| 384 | case EPERM: |
| 385 | // we don't own the mutex |
| 386 | return wxMUTEX_UNLOCKED; |
| 387 | |
| 388 | case EINVAL: |
| 389 | wxLogDebug(_T("pthread_mutex_unlock(): mutex not initialized.")); |
| 390 | break; |
| 391 | |
| 392 | case 0: |
| 393 | return wxMUTEX_NO_ERROR; |
| 394 | |
| 395 | default: |
| 396 | wxLogApiError(_T("pthread_mutex_unlock()"), err); |
| 397 | } |
| 398 | |
| 399 | return wxMUTEX_MISC_ERROR; |
| 400 | } |
| 401 | |
| 402 | // =========================================================================== |
| 403 | // wxCondition implementation |
| 404 | // =========================================================================== |
| 405 | |
| 406 | // --------------------------------------------------------------------------- |
| 407 | // wxConditionInternal |
| 408 | // --------------------------------------------------------------------------- |
| 409 | |
| 410 | // this is a wrapper around pthread_cond_t associated with a wxMutex (and hence |
| 411 | // with a pthread_mutex_t) |
| 412 | class wxConditionInternal |
| 413 | { |
| 414 | public: |
| 415 | wxConditionInternal(wxMutex& mutex); |
| 416 | ~wxConditionInternal(); |
| 417 | |
| 418 | bool IsOk() const { return m_isOk && m_mutex.IsOk(); } |
| 419 | |
| 420 | wxCondError Wait(); |
| 421 | wxCondError WaitTimeout(unsigned long milliseconds); |
| 422 | |
| 423 | wxCondError Signal(); |
| 424 | wxCondError Broadcast(); |
| 425 | |
| 426 | private: |
| 427 | // get the POSIX mutex associated with us |
| 428 | pthread_mutex_t *GetPMutex() const { return &m_mutex.m_internal->m_mutex; } |
| 429 | |
| 430 | wxMutex& m_mutex; |
| 431 | pthread_cond_t m_cond; |
| 432 | |
| 433 | bool m_isOk; |
| 434 | }; |
| 435 | |
| 436 | wxConditionInternal::wxConditionInternal(wxMutex& mutex) |
| 437 | : m_mutex(mutex) |
| 438 | { |
| 439 | int err = pthread_cond_init(&m_cond, NULL /* default attributes */); |
| 440 | |
| 441 | m_isOk = err == 0; |
| 442 | |
| 443 | if ( !m_isOk ) |
| 444 | { |
| 445 | wxLogApiError(_T("pthread_cond_init()"), err); |
| 446 | } |
| 447 | } |
| 448 | |
| 449 | wxConditionInternal::~wxConditionInternal() |
| 450 | { |
| 451 | if ( m_isOk ) |
| 452 | { |
| 453 | int err = pthread_cond_destroy(&m_cond); |
| 454 | if ( err != 0 ) |
| 455 | { |
| 456 | wxLogApiError(_T("pthread_cond_destroy()"), err); |
| 457 | } |
| 458 | } |
| 459 | } |
| 460 | |
| 461 | wxCondError wxConditionInternal::Wait() |
| 462 | { |
| 463 | int err = pthread_cond_wait(&m_cond, GetPMutex()); |
| 464 | if ( err != 0 ) |
| 465 | { |
| 466 | wxLogApiError(_T("pthread_cond_wait()"), err); |
| 467 | |
| 468 | return wxCOND_MISC_ERROR; |
| 469 | } |
| 470 | |
| 471 | return wxCOND_NO_ERROR; |
| 472 | } |
| 473 | |
| 474 | wxCondError wxConditionInternal::WaitTimeout(unsigned long milliseconds) |
| 475 | { |
| 476 | wxLongLong curtime = wxGetLocalTimeMillis(); |
| 477 | curtime += milliseconds; |
| 478 | wxLongLong temp = curtime / 1000; |
| 479 | int sec = temp.GetLo(); |
| 480 | temp *= 1000; |
| 481 | temp = curtime - temp; |
| 482 | int millis = temp.GetLo(); |
| 483 | |
| 484 | timespec tspec; |
| 485 | |
| 486 | tspec.tv_sec = sec; |
| 487 | tspec.tv_nsec = millis * 1000L * 1000L; |
| 488 | |
| 489 | int err = pthread_cond_timedwait( &m_cond, GetPMutex(), &tspec ); |
| 490 | switch ( err ) |
| 491 | { |
| 492 | case ETIMEDOUT: |
| 493 | return wxCOND_TIMEOUT; |
| 494 | |
| 495 | case 0: |
| 496 | return wxCOND_NO_ERROR; |
| 497 | |
| 498 | default: |
| 499 | wxLogApiError(_T("pthread_cond_timedwait()"), err); |
| 500 | } |
| 501 | |
| 502 | return wxCOND_MISC_ERROR; |
| 503 | } |
| 504 | |
| 505 | wxCondError wxConditionInternal::Signal() |
| 506 | { |
| 507 | int err = pthread_cond_signal(&m_cond); |
| 508 | if ( err != 0 ) |
| 509 | { |
| 510 | wxLogApiError(_T("pthread_cond_signal()"), err); |
| 511 | |
| 512 | return wxCOND_MISC_ERROR; |
| 513 | } |
| 514 | |
| 515 | return wxCOND_NO_ERROR; |
| 516 | } |
| 517 | |
| 518 | wxCondError wxConditionInternal::Broadcast() |
| 519 | { |
| 520 | int err = pthread_cond_broadcast(&m_cond); |
| 521 | if ( err != 0 ) |
| 522 | { |
| 523 | wxLogApiError(_T("pthread_cond_broadcast()"), err); |
| 524 | |
| 525 | return wxCOND_MISC_ERROR; |
| 526 | } |
| 527 | |
| 528 | return wxCOND_NO_ERROR; |
| 529 | } |
| 530 | |
| 531 | // =========================================================================== |
| 532 | // wxSemaphore implementation |
| 533 | // =========================================================================== |
| 534 | |
| 535 | // --------------------------------------------------------------------------- |
| 536 | // wxSemaphoreInternal |
| 537 | // --------------------------------------------------------------------------- |
| 538 | |
| 539 | // we implement the semaphores using mutexes and conditions instead of using |
| 540 | // the sem_xxx() POSIX functions because they're not widely available and also |
| 541 | // because it's impossible to implement WaitTimeout() using them |
| 542 | class wxSemaphoreInternal |
| 543 | { |
| 544 | public: |
| 545 | wxSemaphoreInternal(int initialcount, int maxcount); |
| 546 | |
| 547 | bool IsOk() const { return m_isOk; } |
| 548 | |
| 549 | wxSemaError Wait(); |
| 550 | wxSemaError TryWait(); |
| 551 | wxSemaError WaitTimeout(unsigned long milliseconds); |
| 552 | |
| 553 | wxSemaError Post(); |
| 554 | |
| 555 | private: |
| 556 | wxMutex m_mutex; |
| 557 | wxCondition m_cond; |
| 558 | |
| 559 | size_t m_count, |
| 560 | m_maxcount; |
| 561 | |
| 562 | bool m_isOk; |
| 563 | }; |
| 564 | |
| 565 | wxSemaphoreInternal::wxSemaphoreInternal(int initialcount, int maxcount) |
| 566 | : m_cond(m_mutex) |
| 567 | { |
| 568 | |
| 569 | if ( (initialcount < 0 || maxcount < 0) || |
| 570 | ((maxcount > 0) && (initialcount > maxcount)) ) |
| 571 | { |
| 572 | wxFAIL_MSG( _T("wxSemaphore: invalid initial or maximal count") ); |
| 573 | |
| 574 | m_isOk = false; |
| 575 | } |
| 576 | else |
| 577 | { |
| 578 | m_maxcount = (size_t)maxcount; |
| 579 | m_count = (size_t)initialcount; |
| 580 | } |
| 581 | |
| 582 | m_isOk = m_mutex.IsOk() && m_cond.IsOk(); |
| 583 | } |
| 584 | |
| 585 | wxSemaError wxSemaphoreInternal::Wait() |
| 586 | { |
| 587 | wxMutexLocker locker(m_mutex); |
| 588 | |
| 589 | while ( m_count == 0 ) |
| 590 | { |
| 591 | wxLogTrace(TRACE_SEMA, |
| 592 | _T("Thread %ld waiting for semaphore to become signalled"), |
| 593 | wxThread::GetCurrentId()); |
| 594 | |
| 595 | if ( m_cond.Wait() != wxCOND_NO_ERROR ) |
| 596 | return wxSEMA_MISC_ERROR; |
| 597 | |
| 598 | wxLogTrace(TRACE_SEMA, |
| 599 | _T("Thread %ld finished waiting for semaphore, count = %lu"), |
| 600 | wxThread::GetCurrentId(), (unsigned long)m_count); |
| 601 | } |
| 602 | |
| 603 | m_count--; |
| 604 | |
| 605 | return wxSEMA_NO_ERROR; |
| 606 | } |
| 607 | |
| 608 | wxSemaError wxSemaphoreInternal::TryWait() |
| 609 | { |
| 610 | wxMutexLocker locker(m_mutex); |
| 611 | |
| 612 | if ( m_count == 0 ) |
| 613 | return wxSEMA_BUSY; |
| 614 | |
| 615 | m_count--; |
| 616 | |
| 617 | return wxSEMA_NO_ERROR; |
| 618 | } |
| 619 | |
| 620 | wxSemaError wxSemaphoreInternal::WaitTimeout(unsigned long milliseconds) |
| 621 | { |
| 622 | wxMutexLocker locker(m_mutex); |
| 623 | |
| 624 | wxLongLong startTime = wxGetLocalTimeMillis(); |
| 625 | |
| 626 | while ( m_count == 0 ) |
| 627 | { |
| 628 | wxLongLong elapsed = wxGetLocalTimeMillis() - startTime; |
| 629 | long remainingTime = (long)milliseconds - (long)elapsed.GetLo(); |
| 630 | if ( remainingTime <= 0 ) |
| 631 | { |
| 632 | // timeout |
| 633 | return wxSEMA_TIMEOUT; |
| 634 | } |
| 635 | |
| 636 | switch ( m_cond.WaitTimeout(remainingTime) ) |
| 637 | { |
| 638 | case wxCOND_TIMEOUT: |
| 639 | return wxSEMA_TIMEOUT; |
| 640 | |
| 641 | default: |
| 642 | return wxSEMA_MISC_ERROR; |
| 643 | |
| 644 | case wxCOND_NO_ERROR: |
| 645 | ; |
| 646 | } |
| 647 | } |
| 648 | |
| 649 | m_count--; |
| 650 | |
| 651 | return wxSEMA_NO_ERROR; |
| 652 | } |
| 653 | |
| 654 | wxSemaError wxSemaphoreInternal::Post() |
| 655 | { |
| 656 | wxMutexLocker locker(m_mutex); |
| 657 | |
| 658 | if ( m_maxcount > 0 && m_count == m_maxcount ) |
| 659 | { |
| 660 | return wxSEMA_OVERFLOW; |
| 661 | } |
| 662 | |
| 663 | m_count++; |
| 664 | |
| 665 | wxLogTrace(TRACE_SEMA, |
| 666 | _T("Thread %ld about to signal semaphore, count = %lu"), |
| 667 | wxThread::GetCurrentId(), (unsigned long)m_count); |
| 668 | |
| 669 | return m_cond.Signal() == wxCOND_NO_ERROR ? wxSEMA_NO_ERROR |
| 670 | : wxSEMA_MISC_ERROR; |
| 671 | } |
| 672 | |
| 673 | // =========================================================================== |
| 674 | // wxThread implementation |
| 675 | // =========================================================================== |
| 676 | |
| 677 | // the thread callback functions must have the C linkage |
| 678 | extern "C" |
| 679 | { |
| 680 | |
| 681 | #ifdef wxHAVE_PTHREAD_CLEANUP |
| 682 | // thread exit function |
| 683 | void wxPthreadCleanup(void *ptr); |
| 684 | #endif // wxHAVE_PTHREAD_CLEANUP |
| 685 | |
| 686 | void *wxPthreadStart(void *ptr); |
| 687 | |
| 688 | } // extern "C" |
| 689 | |
| 690 | // ---------------------------------------------------------------------------- |
| 691 | // wxThreadInternal |
| 692 | // ---------------------------------------------------------------------------- |
| 693 | |
| 694 | class wxThreadInternal |
| 695 | { |
| 696 | public: |
| 697 | wxThreadInternal(); |
| 698 | ~wxThreadInternal(); |
| 699 | |
| 700 | // thread entry function |
| 701 | static void *PthreadStart(wxThread *thread); |
| 702 | |
| 703 | // thread actions |
| 704 | // start the thread |
| 705 | wxThreadError Run(); |
| 706 | // unblock the thread allowing it to run |
| 707 | void SignalRun() { m_semRun.Post(); } |
| 708 | // ask the thread to terminate |
| 709 | void Wait(); |
| 710 | // go to sleep until Resume() is called |
| 711 | void Pause(); |
| 712 | // resume the thread |
| 713 | void Resume(); |
| 714 | |
| 715 | // accessors |
| 716 | // priority |
| 717 | int GetPriority() const { return m_prio; } |
| 718 | void SetPriority(int prio) { m_prio = prio; } |
| 719 | // state |
| 720 | wxThreadState GetState() const { return m_state; } |
| 721 | void SetState(wxThreadState state) |
| 722 | { |
| 723 | #ifdef __WXDEBUG__ |
| 724 | static const wxChar *stateNames[] = |
| 725 | { |
| 726 | _T("NEW"), |
| 727 | _T("RUNNING"), |
| 728 | _T("PAUSED"), |
| 729 | _T("EXITED"), |
| 730 | }; |
| 731 | |
| 732 | wxLogTrace(TRACE_THREADS, _T("Thread %ld: %s => %s."), |
| 733 | (long)GetId(), stateNames[m_state], stateNames[state]); |
| 734 | #endif // __WXDEBUG__ |
| 735 | |
| 736 | m_state = state; |
| 737 | } |
| 738 | // id |
| 739 | pthread_t GetId() const { return m_threadId; } |
| 740 | pthread_t *GetIdPtr() { return &m_threadId; } |
| 741 | // "cancelled" flag |
| 742 | void SetCancelFlag() { m_cancelled = true; } |
| 743 | bool WasCancelled() const { return m_cancelled; } |
| 744 | // exit code |
| 745 | void SetExitCode(wxThread::ExitCode exitcode) { m_exitcode = exitcode; } |
| 746 | wxThread::ExitCode GetExitCode() const { return m_exitcode; } |
| 747 | |
| 748 | // the pause flag |
| 749 | void SetReallyPaused(bool paused) { m_isPaused = paused; } |
| 750 | bool IsReallyPaused() const { return m_isPaused; } |
| 751 | |
| 752 | // tell the thread that it is a detached one |
| 753 | void Detach() |
| 754 | { |
| 755 | wxCriticalSectionLocker lock(m_csJoinFlag); |
| 756 | |
| 757 | m_shouldBeJoined = false; |
| 758 | m_isDetached = true; |
| 759 | } |
| 760 | |
| 761 | #ifdef wxHAVE_PTHREAD_CLEANUP |
| 762 | // this is used by wxPthreadCleanup() only |
| 763 | static void Cleanup(wxThread *thread); |
| 764 | #endif // wxHAVE_PTHREAD_CLEANUP |
| 765 | |
| 766 | private: |
| 767 | pthread_t m_threadId; // id of the thread |
| 768 | wxThreadState m_state; // see wxThreadState enum |
| 769 | int m_prio; // in wxWidgets units: from 0 to 100 |
| 770 | |
| 771 | // this flag is set when the thread should terminate |
| 772 | bool m_cancelled; |
| 773 | |
| 774 | // this flag is set when the thread is blocking on m_semSuspend |
| 775 | bool m_isPaused; |
| 776 | |
| 777 | // the thread exit code - only used for joinable (!detached) threads and |
| 778 | // is only valid after the thread termination |
| 779 | wxThread::ExitCode m_exitcode; |
| 780 | |
| 781 | // many threads may call Wait(), but only one of them should call |
| 782 | // pthread_join(), so we have to keep track of this |
| 783 | wxCriticalSection m_csJoinFlag; |
| 784 | bool m_shouldBeJoined; |
| 785 | bool m_isDetached; |
| 786 | |
| 787 | // this semaphore is posted by Run() and the threads Entry() is not |
| 788 | // called before it is done |
| 789 | wxSemaphore m_semRun; |
| 790 | |
| 791 | // this one is signaled when the thread should resume after having been |
| 792 | // Pause()d |
| 793 | wxSemaphore m_semSuspend; |
| 794 | }; |
| 795 | |
| 796 | // ---------------------------------------------------------------------------- |
| 797 | // thread startup and exit functions |
| 798 | // ---------------------------------------------------------------------------- |
| 799 | |
| 800 | void *wxPthreadStart(void *ptr) |
| 801 | { |
| 802 | return wxThreadInternal::PthreadStart((wxThread *)ptr); |
| 803 | } |
| 804 | |
| 805 | void *wxThreadInternal::PthreadStart(wxThread *thread) |
| 806 | { |
| 807 | wxThreadInternal *pthread = thread->m_internal; |
| 808 | |
| 809 | wxLogTrace(TRACE_THREADS, _T("Thread %ld started."), THR_ID(pthread)); |
| 810 | |
| 811 | // associate the thread pointer with the newly created thread so that |
| 812 | // wxThread::This() will work |
| 813 | int rc = pthread_setspecific(gs_keySelf, thread); |
| 814 | if ( rc != 0 ) |
| 815 | { |
| 816 | wxLogSysError(rc, _("Cannot start thread: error writing TLS")); |
| 817 | |
| 818 | return (void *)-1; |
| 819 | } |
| 820 | |
| 821 | // have to declare this before pthread_cleanup_push() which defines a |
| 822 | // block! |
| 823 | bool dontRunAtAll; |
| 824 | |
| 825 | #ifdef wxHAVE_PTHREAD_CLEANUP |
| 826 | // install the cleanup handler which will be called if the thread is |
| 827 | // cancelled |
| 828 | pthread_cleanup_push(wxPthreadCleanup, thread); |
| 829 | #endif // wxHAVE_PTHREAD_CLEANUP |
| 830 | |
| 831 | // wait for the semaphore to be posted from Run() |
| 832 | pthread->m_semRun.Wait(); |
| 833 | |
| 834 | // test whether we should run the run at all - may be it was deleted |
| 835 | // before it started to Run()? |
| 836 | { |
| 837 | wxCriticalSectionLocker lock(thread->m_critsect); |
| 838 | |
| 839 | dontRunAtAll = pthread->GetState() == STATE_NEW && |
| 840 | pthread->WasCancelled(); |
| 841 | } |
| 842 | |
| 843 | if ( !dontRunAtAll ) |
| 844 | { |
| 845 | // call the main entry |
| 846 | wxLogTrace(TRACE_THREADS, |
| 847 | _T("Thread %ld about to enter its Entry()."), |
| 848 | THR_ID(pthread)); |
| 849 | |
| 850 | wxTRY |
| 851 | { |
| 852 | pthread->m_exitcode = thread->Entry(); |
| 853 | |
| 854 | wxLogTrace(TRACE_THREADS, |
| 855 | _T("Thread %ld Entry() returned %lu."), |
| 856 | THR_ID(pthread), wxPtrToUInt(pthread->m_exitcode)); |
| 857 | } |
| 858 | wxCATCH_ALL( wxTheApp->OnUnhandledException(); ) |
| 859 | |
| 860 | { |
| 861 | wxCriticalSectionLocker lock(thread->m_critsect); |
| 862 | |
| 863 | // change the state of the thread to "exited" so that |
| 864 | // wxPthreadCleanup handler won't do anything from now (if it's |
| 865 | // called before we do pthread_cleanup_pop below) |
| 866 | pthread->SetState(STATE_EXITED); |
| 867 | } |
| 868 | } |
| 869 | |
| 870 | // NB: pthread_cleanup_push/pop() are macros and pop contains the matching |
| 871 | // '}' for the '{' in push, so they must be used in the same block! |
| 872 | #ifdef wxHAVE_PTHREAD_CLEANUP |
| 873 | #ifdef __DECCXX |
| 874 | // under Tru64 we get a warning from macro expansion |
| 875 | #pragma message save |
| 876 | #pragma message disable(declbutnotref) |
| 877 | #endif |
| 878 | |
| 879 | // remove the cleanup handler without executing it |
| 880 | pthread_cleanup_pop(FALSE); |
| 881 | |
| 882 | #ifdef __DECCXX |
| 883 | #pragma message restore |
| 884 | #endif |
| 885 | #endif // wxHAVE_PTHREAD_CLEANUP |
| 886 | |
| 887 | if ( dontRunAtAll ) |
| 888 | { |
| 889 | // FIXME: deleting a possibly joinable thread here??? |
| 890 | delete thread; |
| 891 | |
| 892 | return EXITCODE_CANCELLED; |
| 893 | } |
| 894 | else |
| 895 | { |
| 896 | // terminate the thread |
| 897 | thread->Exit(pthread->m_exitcode); |
| 898 | |
| 899 | wxFAIL_MSG(wxT("wxThread::Exit() can't return.")); |
| 900 | |
| 901 | return NULL; |
| 902 | } |
| 903 | } |
| 904 | |
| 905 | #ifdef wxHAVE_PTHREAD_CLEANUP |
| 906 | |
| 907 | // this handler is called when the thread is cancelled |
| 908 | extern "C" void wxPthreadCleanup(void *ptr) |
| 909 | { |
| 910 | wxThreadInternal::Cleanup((wxThread *)ptr); |
| 911 | } |
| 912 | |
| 913 | void wxThreadInternal::Cleanup(wxThread *thread) |
| 914 | { |
| 915 | if (pthread_getspecific(gs_keySelf) == 0) return; |
| 916 | { |
| 917 | wxCriticalSectionLocker lock(thread->m_critsect); |
| 918 | if ( thread->m_internal->GetState() == STATE_EXITED ) |
| 919 | { |
| 920 | // thread is already considered as finished. |
| 921 | return; |
| 922 | } |
| 923 | } |
| 924 | |
| 925 | // exit the thread gracefully |
| 926 | thread->Exit(EXITCODE_CANCELLED); |
| 927 | } |
| 928 | |
| 929 | #endif // wxHAVE_PTHREAD_CLEANUP |
| 930 | |
| 931 | // ---------------------------------------------------------------------------- |
| 932 | // wxThreadInternal |
| 933 | // ---------------------------------------------------------------------------- |
| 934 | |
| 935 | wxThreadInternal::wxThreadInternal() |
| 936 | { |
| 937 | m_state = STATE_NEW; |
| 938 | m_cancelled = false; |
| 939 | m_prio = WXTHREAD_DEFAULT_PRIORITY; |
| 940 | m_threadId = 0; |
| 941 | m_exitcode = 0; |
| 942 | |
| 943 | // set to true only when the thread starts waiting on m_semSuspend |
| 944 | m_isPaused = false; |
| 945 | |
| 946 | // defaults for joinable threads |
| 947 | m_shouldBeJoined = true; |
| 948 | m_isDetached = false; |
| 949 | } |
| 950 | |
| 951 | wxThreadInternal::~wxThreadInternal() |
| 952 | { |
| 953 | } |
| 954 | |
| 955 | wxThreadError wxThreadInternal::Run() |
| 956 | { |
| 957 | wxCHECK_MSG( GetState() == STATE_NEW, wxTHREAD_RUNNING, |
| 958 | wxT("thread may only be started once after Create()") ); |
| 959 | |
| 960 | SetState(STATE_RUNNING); |
| 961 | |
| 962 | // wake up threads waiting for our start |
| 963 | SignalRun(); |
| 964 | |
| 965 | return wxTHREAD_NO_ERROR; |
| 966 | } |
| 967 | |
| 968 | void wxThreadInternal::Wait() |
| 969 | { |
| 970 | wxCHECK_RET( !m_isDetached, _T("can't wait for a detached thread") ); |
| 971 | |
| 972 | // if the thread we're waiting for is waiting for the GUI mutex, we will |
| 973 | // deadlock so make sure we release it temporarily |
| 974 | if ( wxThread::IsMain() ) |
| 975 | wxMutexGuiLeave(); |
| 976 | |
| 977 | wxLogTrace(TRACE_THREADS, |
| 978 | _T("Starting to wait for thread %ld to exit."), |
| 979 | THR_ID(this)); |
| 980 | |
| 981 | // to avoid memory leaks we should call pthread_join(), but it must only be |
| 982 | // done once so use a critical section to serialize the code below |
| 983 | { |
| 984 | wxCriticalSectionLocker lock(m_csJoinFlag); |
| 985 | |
| 986 | if ( m_shouldBeJoined ) |
| 987 | { |
| 988 | // FIXME shouldn't we set cancellation type to DISABLED here? If |
| 989 | // we're cancelled inside pthread_join(), things will almost |
| 990 | // certainly break - but if we disable the cancellation, we |
| 991 | // might deadlock |
| 992 | if ( pthread_join(GetId(), &m_exitcode) != 0 ) |
| 993 | { |
| 994 | // this is a serious problem, so use wxLogError and not |
| 995 | // wxLogDebug: it is possible to bring the system to its knees |
| 996 | // by creating too many threads and not joining them quite |
| 997 | // easily |
| 998 | wxLogError(_("Failed to join a thread, potential memory leak detected - please restart the program")); |
| 999 | } |
| 1000 | |
| 1001 | m_shouldBeJoined = false; |
| 1002 | } |
| 1003 | } |
| 1004 | |
| 1005 | // reacquire GUI mutex |
| 1006 | if ( wxThread::IsMain() ) |
| 1007 | wxMutexGuiEnter(); |
| 1008 | } |
| 1009 | |
| 1010 | void wxThreadInternal::Pause() |
| 1011 | { |
| 1012 | // the state is set from the thread which pauses us first, this function |
| 1013 | // is called later so the state should have been already set |
| 1014 | wxCHECK_RET( m_state == STATE_PAUSED, |
| 1015 | wxT("thread must first be paused with wxThread::Pause().") ); |
| 1016 | |
| 1017 | wxLogTrace(TRACE_THREADS, |
| 1018 | _T("Thread %ld goes to sleep."), THR_ID(this)); |
| 1019 | |
| 1020 | // wait until the semaphore is Post()ed from Resume() |
| 1021 | m_semSuspend.Wait(); |
| 1022 | } |
| 1023 | |
| 1024 | void wxThreadInternal::Resume() |
| 1025 | { |
| 1026 | wxCHECK_RET( m_state == STATE_PAUSED, |
| 1027 | wxT("can't resume thread which is not suspended.") ); |
| 1028 | |
| 1029 | // the thread might be not actually paused yet - if there were no call to |
| 1030 | // TestDestroy() since the last call to Pause() for example |
| 1031 | if ( IsReallyPaused() ) |
| 1032 | { |
| 1033 | wxLogTrace(TRACE_THREADS, |
| 1034 | _T("Waking up thread %ld"), THR_ID(this)); |
| 1035 | |
| 1036 | // wake up Pause() |
| 1037 | m_semSuspend.Post(); |
| 1038 | |
| 1039 | // reset the flag |
| 1040 | SetReallyPaused(false); |
| 1041 | } |
| 1042 | else |
| 1043 | { |
| 1044 | wxLogTrace(TRACE_THREADS, |
| 1045 | _T("Thread %ld is not yet really paused"), THR_ID(this)); |
| 1046 | } |
| 1047 | |
| 1048 | SetState(STATE_RUNNING); |
| 1049 | } |
| 1050 | |
| 1051 | // ----------------------------------------------------------------------------- |
| 1052 | // wxThread static functions |
| 1053 | // ----------------------------------------------------------------------------- |
| 1054 | |
| 1055 | wxThread *wxThread::This() |
| 1056 | { |
| 1057 | return (wxThread *)pthread_getspecific(gs_keySelf); |
| 1058 | } |
| 1059 | |
| 1060 | bool wxThread::IsMain() |
| 1061 | { |
| 1062 | return (bool)pthread_equal(pthread_self(), gs_tidMain) || gs_tidMain == (pthread_t)-1; |
| 1063 | } |
| 1064 | |
| 1065 | void wxThread::Yield() |
| 1066 | { |
| 1067 | #ifdef HAVE_SCHED_YIELD |
| 1068 | sched_yield(); |
| 1069 | #endif |
| 1070 | } |
| 1071 | |
| 1072 | int wxThread::GetCPUCount() |
| 1073 | { |
| 1074 | #if defined(_SC_NPROCESSORS_ONLN) |
| 1075 | // this works for Solaris and Linux 2.6 |
| 1076 | int rc = sysconf(_SC_NPROCESSORS_ONLN); |
| 1077 | if ( rc != -1 ) |
| 1078 | { |
| 1079 | return rc; |
| 1080 | } |
| 1081 | #elif defined(__LINUX__) && wxUSE_FFILE |
| 1082 | // read from proc (can't use wxTextFile here because it's a special file: |
| 1083 | // it has 0 size but still can be read from) |
| 1084 | wxLogNull nolog; |
| 1085 | |
| 1086 | wxFFile file(_T("/proc/cpuinfo")); |
| 1087 | if ( file.IsOpened() ) |
| 1088 | { |
| 1089 | // slurp the whole file |
| 1090 | wxString s; |
| 1091 | if ( file.ReadAll(&s) ) |
| 1092 | { |
| 1093 | // (ab)use Replace() to find the number of "processor: num" strings |
| 1094 | size_t count = s.Replace(_T("processor\t:"), _T("")); |
| 1095 | if ( count > 0 ) |
| 1096 | { |
| 1097 | return count; |
| 1098 | } |
| 1099 | |
| 1100 | wxLogDebug(_T("failed to parse /proc/cpuinfo")); |
| 1101 | } |
| 1102 | else |
| 1103 | { |
| 1104 | wxLogDebug(_T("failed to read /proc/cpuinfo")); |
| 1105 | } |
| 1106 | } |
| 1107 | #endif // different ways to get number of CPUs |
| 1108 | |
| 1109 | // unknown |
| 1110 | return -1; |
| 1111 | } |
| 1112 | |
| 1113 | // VMS is a 64 bit system and threads have 64 bit pointers. |
| 1114 | // FIXME: also needed for other systems???? |
| 1115 | #ifdef __VMS |
| 1116 | unsigned long long wxThread::GetCurrentId() |
| 1117 | { |
| 1118 | return (unsigned long long)pthread_self(); |
| 1119 | } |
| 1120 | |
| 1121 | #else // !__VMS |
| 1122 | |
| 1123 | unsigned long wxThread::GetCurrentId() |
| 1124 | { |
| 1125 | return (unsigned long)pthread_self(); |
| 1126 | } |
| 1127 | |
| 1128 | #endif // __VMS/!__VMS |
| 1129 | |
| 1130 | |
| 1131 | bool wxThread::SetConcurrency(size_t level) |
| 1132 | { |
| 1133 | #ifdef HAVE_THR_SETCONCURRENCY |
| 1134 | int rc = thr_setconcurrency(level); |
| 1135 | if ( rc != 0 ) |
| 1136 | { |
| 1137 | wxLogSysError(rc, _T("thr_setconcurrency() failed")); |
| 1138 | } |
| 1139 | |
| 1140 | return rc == 0; |
| 1141 | #else // !HAVE_THR_SETCONCURRENCY |
| 1142 | // ok only for the default value |
| 1143 | return level == 0; |
| 1144 | #endif // HAVE_THR_SETCONCURRENCY/!HAVE_THR_SETCONCURRENCY |
| 1145 | } |
| 1146 | |
| 1147 | // ----------------------------------------------------------------------------- |
| 1148 | // creating thread |
| 1149 | // ----------------------------------------------------------------------------- |
| 1150 | |
| 1151 | wxThread::wxThread(wxThreadKind kind) |
| 1152 | { |
| 1153 | // add this thread to the global list of all threads |
| 1154 | { |
| 1155 | wxMutexLocker lock(*gs_mutexAllThreads); |
| 1156 | |
| 1157 | gs_allThreads.Add(this); |
| 1158 | } |
| 1159 | |
| 1160 | m_internal = new wxThreadInternal(); |
| 1161 | |
| 1162 | m_isDetached = kind == wxTHREAD_DETACHED; |
| 1163 | } |
| 1164 | |
| 1165 | #ifdef HAVE_PTHREAD_ATTR_SETSTACKSIZE |
| 1166 | #define WXUNUSED_STACKSIZE(identifier) identifier |
| 1167 | #else |
| 1168 | #define WXUNUSED_STACKSIZE(identifier) WXUNUSED(identifier) |
| 1169 | #endif |
| 1170 | |
| 1171 | wxThreadError wxThread::Create(unsigned int WXUNUSED_STACKSIZE(stackSize)) |
| 1172 | { |
| 1173 | if ( m_internal->GetState() != STATE_NEW ) |
| 1174 | { |
| 1175 | // don't recreate thread |
| 1176 | return wxTHREAD_RUNNING; |
| 1177 | } |
| 1178 | |
| 1179 | // set up the thread attribute: right now, we only set thread priority |
| 1180 | pthread_attr_t attr; |
| 1181 | pthread_attr_init(&attr); |
| 1182 | |
| 1183 | #ifdef HAVE_PTHREAD_ATTR_SETSTACKSIZE |
| 1184 | if (stackSize) |
| 1185 | pthread_attr_setstacksize(&attr, stackSize); |
| 1186 | #endif |
| 1187 | |
| 1188 | #ifdef HAVE_THREAD_PRIORITY_FUNCTIONS |
| 1189 | int policy; |
| 1190 | if ( pthread_attr_getschedpolicy(&attr, &policy) != 0 ) |
| 1191 | { |
| 1192 | wxLogError(_("Cannot retrieve thread scheduling policy.")); |
| 1193 | } |
| 1194 | |
| 1195 | #ifdef __VMS__ |
| 1196 | /* the pthread.h contains too many spaces. This is a work-around */ |
| 1197 | # undef sched_get_priority_max |
| 1198 | #undef sched_get_priority_min |
| 1199 | #define sched_get_priority_max(_pol_) \ |
| 1200 | (_pol_ == SCHED_OTHER ? PRI_FG_MAX_NP : PRI_FIFO_MAX) |
| 1201 | #define sched_get_priority_min(_pol_) \ |
| 1202 | (_pol_ == SCHED_OTHER ? PRI_FG_MIN_NP : PRI_FIFO_MIN) |
| 1203 | #endif |
| 1204 | |
| 1205 | int max_prio = sched_get_priority_max(policy), |
| 1206 | min_prio = sched_get_priority_min(policy), |
| 1207 | prio = m_internal->GetPriority(); |
| 1208 | |
| 1209 | if ( min_prio == -1 || max_prio == -1 ) |
| 1210 | { |
| 1211 | wxLogError(_("Cannot get priority range for scheduling policy %d."), |
| 1212 | policy); |
| 1213 | } |
| 1214 | else if ( max_prio == min_prio ) |
| 1215 | { |
| 1216 | if ( prio != WXTHREAD_DEFAULT_PRIORITY ) |
| 1217 | { |
| 1218 | // notify the programmer that this doesn't work here |
| 1219 | wxLogWarning(_("Thread priority setting is ignored.")); |
| 1220 | } |
| 1221 | //else: we have default priority, so don't complain |
| 1222 | |
| 1223 | // anyhow, don't do anything because priority is just ignored |
| 1224 | } |
| 1225 | else |
| 1226 | { |
| 1227 | struct sched_param sp; |
| 1228 | if ( pthread_attr_getschedparam(&attr, &sp) != 0 ) |
| 1229 | { |
| 1230 | wxFAIL_MSG(_T("pthread_attr_getschedparam() failed")); |
| 1231 | } |
| 1232 | |
| 1233 | sp.sched_priority = min_prio + (prio*(max_prio - min_prio))/100; |
| 1234 | |
| 1235 | if ( pthread_attr_setschedparam(&attr, &sp) != 0 ) |
| 1236 | { |
| 1237 | wxFAIL_MSG(_T("pthread_attr_setschedparam(priority) failed")); |
| 1238 | } |
| 1239 | } |
| 1240 | #endif // HAVE_THREAD_PRIORITY_FUNCTIONS |
| 1241 | |
| 1242 | #ifdef HAVE_PTHREAD_ATTR_SETSCOPE |
| 1243 | // this will make the threads created by this process really concurrent |
| 1244 | if ( pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM) != 0 ) |
| 1245 | { |
| 1246 | wxFAIL_MSG(_T("pthread_attr_setscope(PTHREAD_SCOPE_SYSTEM) failed")); |
| 1247 | } |
| 1248 | #endif // HAVE_PTHREAD_ATTR_SETSCOPE |
| 1249 | |
| 1250 | // VZ: assume that this one is always available (it's rather fundamental), |
| 1251 | // if this function is ever missing we should try to use |
| 1252 | // pthread_detach() instead (after thread creation) |
| 1253 | if ( m_isDetached ) |
| 1254 | { |
| 1255 | if ( pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) != 0 ) |
| 1256 | { |
| 1257 | wxFAIL_MSG(_T("pthread_attr_setdetachstate(DETACHED) failed")); |
| 1258 | } |
| 1259 | |
| 1260 | // never try to join detached threads |
| 1261 | m_internal->Detach(); |
| 1262 | } |
| 1263 | //else: threads are created joinable by default, it's ok |
| 1264 | |
| 1265 | // create the new OS thread object |
| 1266 | int rc = pthread_create |
| 1267 | ( |
| 1268 | m_internal->GetIdPtr(), |
| 1269 | &attr, |
| 1270 | wxPthreadStart, |
| 1271 | (void *)this |
| 1272 | ); |
| 1273 | |
| 1274 | if ( pthread_attr_destroy(&attr) != 0 ) |
| 1275 | { |
| 1276 | wxFAIL_MSG(_T("pthread_attr_destroy() failed")); |
| 1277 | } |
| 1278 | |
| 1279 | if ( rc != 0 ) |
| 1280 | { |
| 1281 | m_internal->SetState(STATE_EXITED); |
| 1282 | |
| 1283 | return wxTHREAD_NO_RESOURCE; |
| 1284 | } |
| 1285 | |
| 1286 | return wxTHREAD_NO_ERROR; |
| 1287 | } |
| 1288 | |
| 1289 | wxThreadError wxThread::Run() |
| 1290 | { |
| 1291 | wxCriticalSectionLocker lock(m_critsect); |
| 1292 | |
| 1293 | wxCHECK_MSG( m_internal->GetId(), wxTHREAD_MISC_ERROR, |
| 1294 | wxT("must call wxThread::Create() first") ); |
| 1295 | |
| 1296 | return m_internal->Run(); |
| 1297 | } |
| 1298 | |
| 1299 | // ----------------------------------------------------------------------------- |
| 1300 | // misc accessors |
| 1301 | // ----------------------------------------------------------------------------- |
| 1302 | |
| 1303 | void wxThread::SetPriority(unsigned int prio) |
| 1304 | { |
| 1305 | wxCHECK_RET( ((int)WXTHREAD_MIN_PRIORITY <= (int)prio) && |
| 1306 | ((int)prio <= (int)WXTHREAD_MAX_PRIORITY), |
| 1307 | wxT("invalid thread priority") ); |
| 1308 | |
| 1309 | wxCriticalSectionLocker lock(m_critsect); |
| 1310 | |
| 1311 | switch ( m_internal->GetState() ) |
| 1312 | { |
| 1313 | case STATE_NEW: |
| 1314 | // thread not yet started, priority will be set when it is |
| 1315 | m_internal->SetPriority(prio); |
| 1316 | break; |
| 1317 | |
| 1318 | case STATE_RUNNING: |
| 1319 | case STATE_PAUSED: |
| 1320 | #ifdef HAVE_THREAD_PRIORITY_FUNCTIONS |
| 1321 | #if defined(__LINUX__) |
| 1322 | // On Linux, pthread_setschedparam with SCHED_OTHER does not allow |
| 1323 | // a priority other than 0. Instead, we use the BSD setpriority |
| 1324 | // which alllows us to set a 'nice' value between 20 to -20. Only |
| 1325 | // super user can set a value less than zero (more negative yields |
| 1326 | // higher priority). setpriority set the static priority of a |
| 1327 | // process, but this is OK since Linux is configured as a thread |
| 1328 | // per process. |
| 1329 | // |
| 1330 | // FIXME this is not true for 2.6!! |
| 1331 | |
| 1332 | // map wx priorites WXTHREAD_MIN_PRIORITY..WXTHREAD_MAX_PRIORITY |
| 1333 | // to Unix priorities 20..-20 |
| 1334 | if ( setpriority(PRIO_PROCESS, 0, -(2*(int)prio)/5 + 20) == -1 ) |
| 1335 | { |
| 1336 | wxLogError(_("Failed to set thread priority %d."), prio); |
| 1337 | } |
| 1338 | #else // __LINUX__ |
| 1339 | { |
| 1340 | struct sched_param sparam; |
| 1341 | sparam.sched_priority = prio; |
| 1342 | |
| 1343 | if ( pthread_setschedparam(m_internal->GetId(), |
| 1344 | SCHED_OTHER, &sparam) != 0 ) |
| 1345 | { |
| 1346 | wxLogError(_("Failed to set thread priority %d."), prio); |
| 1347 | } |
| 1348 | } |
| 1349 | #endif // __LINUX__ |
| 1350 | #endif // HAVE_THREAD_PRIORITY_FUNCTIONS |
| 1351 | break; |
| 1352 | |
| 1353 | case STATE_EXITED: |
| 1354 | default: |
| 1355 | wxFAIL_MSG(wxT("impossible to set thread priority in this state")); |
| 1356 | } |
| 1357 | } |
| 1358 | |
| 1359 | unsigned int wxThread::GetPriority() const |
| 1360 | { |
| 1361 | wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect); |
| 1362 | |
| 1363 | return m_internal->GetPriority(); |
| 1364 | } |
| 1365 | |
| 1366 | wxThreadIdType wxThread::GetId() const |
| 1367 | { |
| 1368 | return (wxThreadIdType) m_internal->GetId(); |
| 1369 | } |
| 1370 | |
| 1371 | // ----------------------------------------------------------------------------- |
| 1372 | // pause/resume |
| 1373 | // ----------------------------------------------------------------------------- |
| 1374 | |
| 1375 | wxThreadError wxThread::Pause() |
| 1376 | { |
| 1377 | wxCHECK_MSG( This() != this, wxTHREAD_MISC_ERROR, |
| 1378 | _T("a thread can't pause itself") ); |
| 1379 | |
| 1380 | wxCriticalSectionLocker lock(m_critsect); |
| 1381 | |
| 1382 | if ( m_internal->GetState() != STATE_RUNNING ) |
| 1383 | { |
| 1384 | wxLogDebug(wxT("Can't pause thread which is not running.")); |
| 1385 | |
| 1386 | return wxTHREAD_NOT_RUNNING; |
| 1387 | } |
| 1388 | |
| 1389 | // just set a flag, the thread will be really paused only during the next |
| 1390 | // call to TestDestroy() |
| 1391 | m_internal->SetState(STATE_PAUSED); |
| 1392 | |
| 1393 | return wxTHREAD_NO_ERROR; |
| 1394 | } |
| 1395 | |
| 1396 | wxThreadError wxThread::Resume() |
| 1397 | { |
| 1398 | wxCHECK_MSG( This() != this, wxTHREAD_MISC_ERROR, |
| 1399 | _T("a thread can't resume itself") ); |
| 1400 | |
| 1401 | wxCriticalSectionLocker lock(m_critsect); |
| 1402 | |
| 1403 | wxThreadState state = m_internal->GetState(); |
| 1404 | |
| 1405 | switch ( state ) |
| 1406 | { |
| 1407 | case STATE_PAUSED: |
| 1408 | wxLogTrace(TRACE_THREADS, _T("Thread %ld suspended, resuming."), |
| 1409 | GetId()); |
| 1410 | |
| 1411 | m_internal->Resume(); |
| 1412 | |
| 1413 | return wxTHREAD_NO_ERROR; |
| 1414 | |
| 1415 | case STATE_EXITED: |
| 1416 | wxLogTrace(TRACE_THREADS, _T("Thread %ld exited, won't resume."), |
| 1417 | GetId()); |
| 1418 | return wxTHREAD_NO_ERROR; |
| 1419 | |
| 1420 | default: |
| 1421 | wxLogDebug(_T("Attempt to resume a thread which is not paused.")); |
| 1422 | |
| 1423 | return wxTHREAD_MISC_ERROR; |
| 1424 | } |
| 1425 | } |
| 1426 | |
| 1427 | // ----------------------------------------------------------------------------- |
| 1428 | // exiting thread |
| 1429 | // ----------------------------------------------------------------------------- |
| 1430 | |
| 1431 | wxThread::ExitCode wxThread::Wait() |
| 1432 | { |
| 1433 | wxCHECK_MSG( This() != this, (ExitCode)-1, |
| 1434 | _T("a thread can't wait for itself") ); |
| 1435 | |
| 1436 | wxCHECK_MSG( !m_isDetached, (ExitCode)-1, |
| 1437 | _T("can't wait for detached thread") ); |
| 1438 | |
| 1439 | m_internal->Wait(); |
| 1440 | |
| 1441 | return m_internal->GetExitCode(); |
| 1442 | } |
| 1443 | |
| 1444 | wxThreadError wxThread::Delete(ExitCode *rc) |
| 1445 | { |
| 1446 | wxCHECK_MSG( This() != this, wxTHREAD_MISC_ERROR, |
| 1447 | _T("a thread can't delete itself") ); |
| 1448 | |
| 1449 | bool isDetached = m_isDetached; |
| 1450 | |
| 1451 | m_critsect.Enter(); |
| 1452 | wxThreadState state = m_internal->GetState(); |
| 1453 | |
| 1454 | // ask the thread to stop |
| 1455 | m_internal->SetCancelFlag(); |
| 1456 | |
| 1457 | m_critsect.Leave(); |
| 1458 | |
| 1459 | switch ( state ) |
| 1460 | { |
| 1461 | case STATE_NEW: |
| 1462 | // we need to wake up the thread so that PthreadStart() will |
| 1463 | // terminate - right now it's blocking on run semaphore in |
| 1464 | // PthreadStart() |
| 1465 | m_internal->SignalRun(); |
| 1466 | |
| 1467 | // fall through |
| 1468 | |
| 1469 | case STATE_EXITED: |
| 1470 | // nothing to do |
| 1471 | break; |
| 1472 | |
| 1473 | case STATE_PAUSED: |
| 1474 | // resume the thread first |
| 1475 | m_internal->Resume(); |
| 1476 | |
| 1477 | // fall through |
| 1478 | |
| 1479 | default: |
| 1480 | if ( !isDetached ) |
| 1481 | { |
| 1482 | // wait until the thread stops |
| 1483 | m_internal->Wait(); |
| 1484 | |
| 1485 | if ( rc ) |
| 1486 | { |
| 1487 | // return the exit code of the thread |
| 1488 | *rc = m_internal->GetExitCode(); |
| 1489 | } |
| 1490 | } |
| 1491 | //else: can't wait for detached threads |
| 1492 | } |
| 1493 | |
| 1494 | return wxTHREAD_NO_ERROR; |
| 1495 | } |
| 1496 | |
| 1497 | wxThreadError wxThread::Kill() |
| 1498 | { |
| 1499 | wxCHECK_MSG( This() != this, wxTHREAD_MISC_ERROR, |
| 1500 | _T("a thread can't kill itself") ); |
| 1501 | |
| 1502 | switch ( m_internal->GetState() ) |
| 1503 | { |
| 1504 | case STATE_NEW: |
| 1505 | case STATE_EXITED: |
| 1506 | return wxTHREAD_NOT_RUNNING; |
| 1507 | |
| 1508 | case STATE_PAUSED: |
| 1509 | // resume the thread first |
| 1510 | Resume(); |
| 1511 | |
| 1512 | // fall through |
| 1513 | |
| 1514 | default: |
| 1515 | #ifdef HAVE_PTHREAD_CANCEL |
| 1516 | if ( pthread_cancel(m_internal->GetId()) != 0 ) |
| 1517 | #endif // HAVE_PTHREAD_CANCEL |
| 1518 | { |
| 1519 | wxLogError(_("Failed to terminate a thread.")); |
| 1520 | |
| 1521 | return wxTHREAD_MISC_ERROR; |
| 1522 | } |
| 1523 | |
| 1524 | #ifdef HAVE_PTHREAD_CANCEL |
| 1525 | if ( m_isDetached ) |
| 1526 | { |
| 1527 | // if we use cleanup function, this will be done from |
| 1528 | // wxPthreadCleanup() |
| 1529 | #ifndef wxHAVE_PTHREAD_CLEANUP |
| 1530 | ScheduleThreadForDeletion(); |
| 1531 | |
| 1532 | // don't call OnExit() here, it can only be called in the |
| 1533 | // threads context and we're in the context of another thread |
| 1534 | |
| 1535 | DeleteThread(this); |
| 1536 | #endif // wxHAVE_PTHREAD_CLEANUP |
| 1537 | } |
| 1538 | else |
| 1539 | { |
| 1540 | m_internal->SetExitCode(EXITCODE_CANCELLED); |
| 1541 | } |
| 1542 | |
| 1543 | return wxTHREAD_NO_ERROR; |
| 1544 | #endif // HAVE_PTHREAD_CANCEL |
| 1545 | } |
| 1546 | } |
| 1547 | |
| 1548 | void wxThread::Exit(ExitCode status) |
| 1549 | { |
| 1550 | wxASSERT_MSG( This() == this, |
| 1551 | _T("wxThread::Exit() can only be called in the context of the same thread") ); |
| 1552 | |
| 1553 | if ( m_isDetached ) |
| 1554 | { |
| 1555 | // from the moment we call OnExit(), the main program may terminate at |
| 1556 | // any moment, so mark this thread as being already in process of being |
| 1557 | // deleted or wxThreadModule::OnExit() will try to delete it again |
| 1558 | ScheduleThreadForDeletion(); |
| 1559 | } |
| 1560 | |
| 1561 | // don't enter m_critsect before calling OnExit() because the user code |
| 1562 | // might deadlock if, for example, it signals a condition in OnExit() (a |
| 1563 | // common case) while the main thread calls any of functions entering |
| 1564 | // m_critsect on us (almost all of them do) |
| 1565 | wxTRY |
| 1566 | { |
| 1567 | OnExit(); |
| 1568 | } |
| 1569 | wxCATCH_ALL( wxTheApp->OnUnhandledException(); ) |
| 1570 | |
| 1571 | // delete C++ thread object if this is a detached thread - user is |
| 1572 | // responsible for doing this for joinable ones |
| 1573 | if ( m_isDetached ) |
| 1574 | { |
| 1575 | // FIXME I'm feeling bad about it - what if another thread function is |
| 1576 | // called (in another thread context) now? It will try to access |
| 1577 | // half destroyed object which will probably result in something |
| 1578 | // very bad - but we can't protect this by a crit section unless |
| 1579 | // we make it a global object, but this would mean that we can |
| 1580 | // only call one thread function at a time :-( |
| 1581 | DeleteThread(this); |
| 1582 | pthread_setspecific(gs_keySelf, 0); |
| 1583 | } |
| 1584 | else |
| 1585 | { |
| 1586 | m_critsect.Enter(); |
| 1587 | m_internal->SetState(STATE_EXITED); |
| 1588 | m_critsect.Leave(); |
| 1589 | } |
| 1590 | |
| 1591 | // terminate the thread (pthread_exit() never returns) |
| 1592 | pthread_exit(status); |
| 1593 | |
| 1594 | wxFAIL_MSG(_T("pthread_exit() failed")); |
| 1595 | } |
| 1596 | |
| 1597 | // also test whether we were paused |
| 1598 | bool wxThread::TestDestroy() |
| 1599 | { |
| 1600 | wxASSERT_MSG( This() == this, |
| 1601 | _T("wxThread::TestDestroy() can only be called in the context of the same thread") ); |
| 1602 | |
| 1603 | m_critsect.Enter(); |
| 1604 | |
| 1605 | if ( m_internal->GetState() == STATE_PAUSED ) |
| 1606 | { |
| 1607 | m_internal->SetReallyPaused(true); |
| 1608 | |
| 1609 | // leave the crit section or the other threads will stop too if they |
| 1610 | // try to call any of (seemingly harmless) IsXXX() functions while we |
| 1611 | // sleep |
| 1612 | m_critsect.Leave(); |
| 1613 | |
| 1614 | m_internal->Pause(); |
| 1615 | } |
| 1616 | else |
| 1617 | { |
| 1618 | // thread wasn't requested to pause, nothing to do |
| 1619 | m_critsect.Leave(); |
| 1620 | } |
| 1621 | |
| 1622 | return m_internal->WasCancelled(); |
| 1623 | } |
| 1624 | |
| 1625 | wxThread::~wxThread() |
| 1626 | { |
| 1627 | #ifdef __WXDEBUG__ |
| 1628 | m_critsect.Enter(); |
| 1629 | |
| 1630 | // check that the thread either exited or couldn't be created |
| 1631 | if ( m_internal->GetState() != STATE_EXITED && |
| 1632 | m_internal->GetState() != STATE_NEW ) |
| 1633 | { |
| 1634 | wxLogDebug(_T("The thread %ld is being destroyed although it is still running! The application may crash."), |
| 1635 | (long)GetId()); |
| 1636 | } |
| 1637 | |
| 1638 | m_critsect.Leave(); |
| 1639 | #endif // __WXDEBUG__ |
| 1640 | |
| 1641 | delete m_internal; |
| 1642 | |
| 1643 | // remove this thread from the global array |
| 1644 | { |
| 1645 | wxMutexLocker lock(*gs_mutexAllThreads); |
| 1646 | |
| 1647 | gs_allThreads.Remove(this); |
| 1648 | } |
| 1649 | } |
| 1650 | |
| 1651 | // ----------------------------------------------------------------------------- |
| 1652 | // state tests |
| 1653 | // ----------------------------------------------------------------------------- |
| 1654 | |
| 1655 | bool wxThread::IsRunning() const |
| 1656 | { |
| 1657 | wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect); |
| 1658 | |
| 1659 | return m_internal->GetState() == STATE_RUNNING; |
| 1660 | } |
| 1661 | |
| 1662 | bool wxThread::IsAlive() const |
| 1663 | { |
| 1664 | wxCriticalSectionLocker lock((wxCriticalSection&)m_critsect); |
| 1665 | |
| 1666 | switch ( m_internal->GetState() ) |
| 1667 | { |
| 1668 | case STATE_RUNNING: |
| 1669 | case STATE_PAUSED: |
| 1670 | return true; |
| 1671 | |
| 1672 | default: |
| 1673 | return false; |
| 1674 | } |
| 1675 | } |
| 1676 | |
| 1677 | bool wxThread::IsPaused() const |
| 1678 | { |
| 1679 | wxCriticalSectionLocker lock((wxCriticalSection&)m_critsect); |
| 1680 | |
| 1681 | return (m_internal->GetState() == STATE_PAUSED); |
| 1682 | } |
| 1683 | |
| 1684 | //-------------------------------------------------------------------- |
| 1685 | // wxThreadModule |
| 1686 | //-------------------------------------------------------------------- |
| 1687 | |
| 1688 | class wxThreadModule : public wxModule |
| 1689 | { |
| 1690 | public: |
| 1691 | virtual bool OnInit(); |
| 1692 | virtual void OnExit(); |
| 1693 | |
| 1694 | private: |
| 1695 | DECLARE_DYNAMIC_CLASS(wxThreadModule) |
| 1696 | }; |
| 1697 | |
| 1698 | IMPLEMENT_DYNAMIC_CLASS(wxThreadModule, wxModule) |
| 1699 | |
| 1700 | bool wxThreadModule::OnInit() |
| 1701 | { |
| 1702 | int rc = pthread_key_create(&gs_keySelf, NULL /* dtor function */); |
| 1703 | if ( rc != 0 ) |
| 1704 | { |
| 1705 | wxLogSysError(rc, _("Thread module initialization failed: failed to create thread key")); |
| 1706 | |
| 1707 | return false; |
| 1708 | } |
| 1709 | |
| 1710 | gs_tidMain = pthread_self(); |
| 1711 | |
| 1712 | gs_mutexAllThreads = new wxMutex(); |
| 1713 | |
| 1714 | gs_mutexGui = new wxMutex(); |
| 1715 | gs_mutexGui->Lock(); |
| 1716 | |
| 1717 | gs_mutexDeleteThread = new wxMutex(); |
| 1718 | gs_condAllDeleted = new wxCondition(*gs_mutexDeleteThread); |
| 1719 | |
| 1720 | return true; |
| 1721 | } |
| 1722 | |
| 1723 | void wxThreadModule::OnExit() |
| 1724 | { |
| 1725 | wxASSERT_MSG( wxThread::IsMain(), wxT("only main thread can be here") ); |
| 1726 | |
| 1727 | // are there any threads left which are being deleted right now? |
| 1728 | size_t nThreadsBeingDeleted; |
| 1729 | |
| 1730 | { |
| 1731 | wxMutexLocker lock( *gs_mutexDeleteThread ); |
| 1732 | nThreadsBeingDeleted = gs_nThreadsBeingDeleted; |
| 1733 | |
| 1734 | if ( nThreadsBeingDeleted > 0 ) |
| 1735 | { |
| 1736 | wxLogTrace(TRACE_THREADS, |
| 1737 | _T("Waiting for %lu threads to disappear"), |
| 1738 | (unsigned long)nThreadsBeingDeleted); |
| 1739 | |
| 1740 | // have to wait until all of them disappear |
| 1741 | gs_condAllDeleted->Wait(); |
| 1742 | } |
| 1743 | } |
| 1744 | |
| 1745 | size_t count; |
| 1746 | |
| 1747 | { |
| 1748 | wxMutexLocker lock(*gs_mutexAllThreads); |
| 1749 | |
| 1750 | // terminate any threads left |
| 1751 | count = gs_allThreads.GetCount(); |
| 1752 | if ( count != 0u ) |
| 1753 | { |
| 1754 | wxLogDebug(wxT("%lu threads were not terminated by the application."), |
| 1755 | (unsigned long)count); |
| 1756 | } |
| 1757 | } // unlock mutex before deleting the threads as they lock it in their dtor |
| 1758 | |
| 1759 | for ( size_t n = 0u; n < count; n++ ) |
| 1760 | { |
| 1761 | // Delete calls the destructor which removes the current entry. We |
| 1762 | // should only delete the first one each time. |
| 1763 | gs_allThreads[0]->Delete(); |
| 1764 | } |
| 1765 | |
| 1766 | delete gs_mutexAllThreads; |
| 1767 | |
| 1768 | // destroy GUI mutex |
| 1769 | gs_mutexGui->Unlock(); |
| 1770 | delete gs_mutexGui; |
| 1771 | |
| 1772 | // and free TLD slot |
| 1773 | (void)pthread_key_delete(gs_keySelf); |
| 1774 | |
| 1775 | delete gs_condAllDeleted; |
| 1776 | delete gs_mutexDeleteThread; |
| 1777 | } |
| 1778 | |
| 1779 | // ---------------------------------------------------------------------------- |
| 1780 | // global functions |
| 1781 | // ---------------------------------------------------------------------------- |
| 1782 | |
| 1783 | static void ScheduleThreadForDeletion() |
| 1784 | { |
| 1785 | wxMutexLocker lock( *gs_mutexDeleteThread ); |
| 1786 | |
| 1787 | gs_nThreadsBeingDeleted++; |
| 1788 | |
| 1789 | wxLogTrace(TRACE_THREADS, _T("%lu thread%s waiting to be deleted"), |
| 1790 | (unsigned long)gs_nThreadsBeingDeleted, |
| 1791 | gs_nThreadsBeingDeleted == 1 ? _T("") : _T("s")); |
| 1792 | } |
| 1793 | |
| 1794 | static void DeleteThread(wxThread *This) |
| 1795 | { |
| 1796 | // gs_mutexDeleteThread should be unlocked before signalling the condition |
| 1797 | // or wxThreadModule::OnExit() would deadlock |
| 1798 | wxMutexLocker locker( *gs_mutexDeleteThread ); |
| 1799 | |
| 1800 | wxLogTrace(TRACE_THREADS, _T("Thread %ld auto deletes."), This->GetId()); |
| 1801 | |
| 1802 | delete This; |
| 1803 | |
| 1804 | wxCHECK_RET( gs_nThreadsBeingDeleted > 0, |
| 1805 | _T("no threads scheduled for deletion, yet we delete one?") ); |
| 1806 | |
| 1807 | wxLogTrace(TRACE_THREADS, _T("%lu scheduled for deletion threads left."), |
| 1808 | (unsigned long)gs_nThreadsBeingDeleted - 1); |
| 1809 | |
| 1810 | if ( !--gs_nThreadsBeingDeleted ) |
| 1811 | { |
| 1812 | // no more threads left, signal it |
| 1813 | gs_condAllDeleted->Signal(); |
| 1814 | } |
| 1815 | } |
| 1816 | |
| 1817 | void wxMutexGuiEnterImpl() |
| 1818 | { |
| 1819 | gs_mutexGui->Lock(); |
| 1820 | } |
| 1821 | |
| 1822 | void wxMutexGuiLeaveImpl() |
| 1823 | { |
| 1824 | gs_mutexGui->Unlock(); |
| 1825 | } |
| 1826 | |
| 1827 | // ---------------------------------------------------------------------------- |
| 1828 | // include common implementation code |
| 1829 | // ---------------------------------------------------------------------------- |
| 1830 | |
| 1831 | #include "wx/thrimpl.cpp" |
| 1832 | |
| 1833 | #endif // wxUSE_THREADS |