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489468fe | 1 | ///////////////////////////////////////////////////////////////////////////// |
524c47aa | 2 | // Name: src/osx/carbon/thread.cpp |
489468fe SC |
3 | // Purpose: wxThread Implementation |
4 | // Author: Original from Wolfram Gloger/Guilhem Lavaux/Vadim Zeitlin | |
5 | // Modified by: Aj Lavin, Stefan Csomor | |
6 | // Created: 04/22/98 | |
7 | // RCS-ID: $Id$ | |
8 | // Copyright: (c) Wolfram Gloger (1996, 1997); Guilhem Lavaux (1998), | |
9 | // Vadim Zeitlin (1999), Stefan Csomor (2000) | |
10 | // Licence: wxWindows licence | |
11 | ///////////////////////////////////////////////////////////////////////////// | |
12 | ||
13 | #include "wx/wxprec.h" | |
14 | ||
15 | #if defined(__BORLANDC__) | |
16 | #pragma hdrstop | |
17 | #endif | |
18 | ||
19 | #ifndef WX_PRECOMP | |
20 | #include "wx/wx.h" | |
21 | #include "wx/module.h" | |
22 | #endif | |
23 | ||
24 | #if wxUSE_THREADS | |
25 | ||
26 | #include "wx/thread.h" | |
27 | ||
b2680ced | 28 | #if wxOSX_USE_COCOA_OR_CARBON |
489468fe | 29 | #include <CoreServices/CoreServices.h> |
b2680ced SC |
30 | #else |
31 | #include <Foundation/Foundation.h> | |
32 | #endif | |
33 | ||
1f0c8f31 | 34 | #include "wx/osx/uma.h" |
489468fe SC |
35 | |
36 | // the possible states of the thread: | |
37 | // ("=>" shows all possible transitions from this state) | |
38 | enum wxThreadState | |
39 | { | |
40 | STATE_NEW, // didn't start execution yet (=> RUNNING) | |
41 | STATE_RUNNING, // thread is running (=> PAUSED, CANCELED) | |
42 | STATE_PAUSED, // thread is temporarily suspended (=> RUNNING) | |
43 | STATE_CANCELED, // thread should terminate a.s.a.p. (=> EXITED) | |
44 | STATE_EXITED // thread is terminating | |
45 | }; | |
46 | ||
47 | // ---------------------------------------------------------------------------- | |
48 | // globals | |
49 | // ---------------------------------------------------------------------------- | |
50 | ||
51 | // the task ID of the main thread | |
f9226383 | 52 | wxThreadIdType wxThread::ms_idMainThread = kInvalidID; |
489468fe SC |
53 | |
54 | // this is the Per-Task Storage for the pointer to the appropriate wxThread | |
55 | TaskStorageIndex gs_tlsForWXThread = 0; | |
56 | ||
57 | // if it's false, some secondary thread is holding the GUI lock | |
58 | static bool gs_bGuiOwnedByMainThread = true; | |
59 | ||
60 | // critical section which controls access to all GUI functions: any secondary | |
61 | // thread (i.e. except the main one) must enter this crit section before doing | |
62 | // any GUI calls | |
63 | static wxCriticalSection *gs_critsectGui = NULL; | |
64 | ||
65 | // critical section which protects gs_nWaitingForGui variable | |
66 | static wxCriticalSection *gs_critsectWaitingForGui = NULL; | |
67 | ||
68 | // number of threads waiting for GUI in wxMutexGuiEnter() | |
69 | static size_t gs_nWaitingForGui = 0; | |
70 | ||
71 | // overall number of threads, needed for determining | |
72 | // the sleep value of the main event loop | |
73 | size_t g_numberOfThreads = 0; | |
74 | ||
75 | ||
76 | #if wxUSE_GUI | |
77 | MPCriticalRegionID gs_guiCritical = kInvalidID; | |
78 | #endif | |
79 | ||
80 | // ============================================================================ | |
81 | // MacOS implementation of thread classes | |
82 | // ============================================================================ | |
83 | ||
84 | /* | |
85 | Notes : | |
86 | ||
87 | The implementation is very close to the phtreads implementation, the reason for | |
88 | using MPServices is the fact that these are also available under OS 9. Thus allowing | |
89 | for one common API for all current builds. | |
90 | ||
91 | As soon as wxThreads are on a 64 bit address space, the TLS must be extended | |
92 | to use two indices one for each 32 bit part as the MP implementation is limited | |
93 | to longs. | |
94 | ||
95 | I have three implementations for mutexes : | |
96 | version A based on a binary semaphore, problem - not reentrant, version B based | |
97 | on a critical region, allows for reentrancy, performance implications not | |
98 | yet tested, and third a plain pthreads implementation | |
99 | ||
100 | The same for condition internal, one implementation by Aj Lavin and the other one | |
101 | copied from the thrimpl.cpp which I assume has been more broadly tested, I've just | |
102 | replaced the interlock increment with the appropriate PPC calls | |
103 | */ | |
104 | ||
105 | // ---------------------------------------------------------------------------- | |
106 | // wxCriticalSection | |
107 | // ---------------------------------------------------------------------------- | |
108 | ||
3ad41c28 | 109 | wxCriticalSection::wxCriticalSection( wxCriticalSectionType WXUNUSED(critSecType) ) |
489468fe SC |
110 | { |
111 | MPCreateCriticalRegion( (MPCriticalRegionID*) &m_critRegion ); | |
112 | } | |
113 | ||
114 | wxCriticalSection::~wxCriticalSection() | |
115 | { | |
116 | MPDeleteCriticalRegion( (MPCriticalRegionID) m_critRegion ); | |
117 | } | |
118 | ||
119 | void wxCriticalSection::Enter() | |
120 | { | |
121 | MPEnterCriticalRegion( (MPCriticalRegionID) m_critRegion, kDurationForever ); | |
122 | } | |
123 | ||
b9697cb4 VZ |
124 | bool wxCriticalSection::TryEnter() |
125 | { | |
126 | return MPEnterCriticalRegion( (MPCriticalRegionID) m_critRegion, kDurationImmediate ) == noErr; | |
127 | } | |
128 | ||
489468fe SC |
129 | void wxCriticalSection::Leave() |
130 | { | |
131 | MPExitCriticalRegion( (MPCriticalRegionID) m_critRegion ); | |
132 | } | |
133 | ||
134 | // ---------------------------------------------------------------------------- | |
135 | // wxMutex implementation | |
136 | // ---------------------------------------------------------------------------- | |
137 | ||
138 | #define wxUSE_MAC_SEMAPHORE_MUTEX 0 | |
139 | #define wxUSE_MAC_CRITICAL_REGION_MUTEX 1 | |
140 | #define wxUSE_MAC_PTHREADS_MUTEX 0 | |
141 | ||
489468fe SC |
142 | #if wxUSE_MAC_CRITICAL_REGION_MUTEX |
143 | ||
144 | class wxMutexInternal | |
145 | { | |
146 | public: | |
147 | wxMutexInternal( wxMutexType mutexType ); | |
148 | virtual ~wxMutexInternal(); | |
149 | ||
150 | bool IsOk() const { return m_isOk; } | |
151 | ||
152 | wxMutexError Lock() { return Lock(kDurationForever); } | |
153 | wxMutexError Lock(unsigned long ms); | |
154 | wxMutexError TryLock(); | |
155 | wxMutexError Unlock(); | |
156 | ||
157 | private: | |
158 | MPCriticalRegionID m_critRegion; | |
159 | bool m_isOk ; | |
160 | }; | |
161 | ||
162 | wxMutexInternal::wxMutexInternal( wxMutexType WXUNUSED(mutexType) ) | |
163 | { | |
164 | m_isOk = false; | |
165 | m_critRegion = kInvalidID; | |
166 | ||
167 | verify_noerr( MPCreateCriticalRegion( &m_critRegion ) ); | |
168 | m_isOk = ( m_critRegion != kInvalidID ); | |
169 | if ( !IsOk() ) | |
170 | { | |
171 | wxFAIL_MSG( wxT("Error when creating mutex") ); | |
172 | } | |
173 | } | |
174 | ||
175 | wxMutexInternal::~wxMutexInternal() | |
176 | { | |
177 | if ( m_critRegion != kInvalidID ) | |
178 | MPDeleteCriticalRegion( m_critRegion ); | |
179 | ||
180 | MPYield(); | |
181 | } | |
182 | ||
183 | wxMutexError wxMutexInternal::Lock(unsigned long ms) | |
184 | { | |
185 | wxCHECK_MSG( m_isOk , wxMUTEX_MISC_ERROR , wxT("Invalid Mutex") ); | |
186 | ||
187 | OSStatus err = MPEnterCriticalRegion( m_critRegion, ms ); | |
188 | switch ( err ) | |
189 | { | |
190 | case noErr: | |
191 | break; | |
192 | ||
193 | case kMPTimeoutErr: | |
194 | wxASSERT_MSG( ms != kDurationForever, wxT("unexpected timeout") ); | |
195 | return wxMUTEX_TIMEOUT; | |
196 | ||
197 | default: | |
198 | wxLogSysError(wxT("Could not lock mutex")); | |
199 | return wxMUTEX_MISC_ERROR; | |
200 | } | |
201 | ||
202 | return wxMUTEX_NO_ERROR; | |
203 | } | |
204 | ||
205 | wxMutexError wxMutexInternal::TryLock() | |
206 | { | |
207 | wxCHECK_MSG( m_isOk , wxMUTEX_MISC_ERROR , wxT("Invalid Mutex") ) ; | |
208 | ||
209 | OSStatus err = MPEnterCriticalRegion( m_critRegion, kDurationImmediate); | |
210 | if (err != noErr) | |
211 | { | |
212 | if ( err == kMPTimeoutErr) | |
213 | return wxMUTEX_BUSY; | |
214 | ||
215 | wxLogSysError( wxT("Could not try lock mutex") ); | |
216 | return wxMUTEX_MISC_ERROR; | |
217 | } | |
218 | ||
219 | return wxMUTEX_NO_ERROR; | |
220 | } | |
221 | ||
222 | wxMutexError wxMutexInternal::Unlock() | |
223 | { | |
224 | wxCHECK_MSG( m_isOk , wxMUTEX_MISC_ERROR , wxT("Invalid Mutex") ) ; | |
225 | ||
226 | OSStatus err = MPExitCriticalRegion( m_critRegion ); | |
227 | MPYield() ; | |
228 | ||
229 | if (err != noErr) | |
230 | { | |
231 | wxLogSysError( wxT("Could not unlock mutex") ); | |
232 | ||
233 | return wxMUTEX_MISC_ERROR; | |
234 | } | |
235 | ||
236 | return wxMUTEX_NO_ERROR; | |
237 | } | |
238 | ||
239 | #endif | |
240 | ||
241 | // -------------------------------------------------------------------------- | |
242 | // wxSemaphore | |
243 | // -------------------------------------------------------------------------- | |
244 | ||
245 | class wxSemaphoreInternal | |
246 | { | |
247 | public: | |
248 | wxSemaphoreInternal( int initialcount, int maxcount ); | |
249 | virtual ~wxSemaphoreInternal(); | |
250 | ||
251 | bool IsOk() const | |
252 | { return m_isOk; } | |
253 | ||
254 | wxSemaError Post(); | |
255 | wxSemaError WaitTimeout( unsigned long milliseconds ); | |
256 | ||
257 | wxSemaError Wait() | |
258 | { return WaitTimeout( kDurationForever); } | |
259 | ||
260 | wxSemaError TryWait() | |
261 | { | |
262 | wxSemaError err = WaitTimeout( kDurationImmediate ); | |
263 | if (err == wxSEMA_TIMEOUT) | |
264 | err = wxSEMA_BUSY; | |
265 | ||
266 | return err; | |
267 | } | |
268 | ||
269 | private: | |
270 | MPSemaphoreID m_semaphore; | |
271 | bool m_isOk; | |
272 | }; | |
273 | ||
274 | wxSemaphoreInternal::wxSemaphoreInternal( int initialcount, int maxcount) | |
275 | { | |
276 | m_isOk = false; | |
277 | m_semaphore = kInvalidID; | |
278 | if ( maxcount == 0 ) | |
279 | // make it practically infinite | |
280 | maxcount = INT_MAX; | |
281 | ||
282 | verify_noerr( MPCreateSemaphore( maxcount, initialcount, &m_semaphore ) ); | |
283 | m_isOk = ( m_semaphore != kInvalidID ); | |
284 | ||
285 | if ( !IsOk() ) | |
286 | { | |
287 | wxFAIL_MSG( wxT("Error when creating semaphore") ); | |
288 | } | |
289 | } | |
290 | ||
291 | wxSemaphoreInternal::~wxSemaphoreInternal() | |
292 | { | |
293 | if (m_semaphore != kInvalidID) | |
294 | MPDeleteSemaphore( m_semaphore ); | |
295 | ||
296 | MPYield(); | |
297 | } | |
298 | ||
299 | wxSemaError wxSemaphoreInternal::WaitTimeout( unsigned long milliseconds ) | |
300 | { | |
301 | OSStatus err = MPWaitOnSemaphore( m_semaphore, milliseconds ); | |
302 | if (err != noErr) | |
303 | { | |
304 | if (err == kMPTimeoutErr) | |
305 | return wxSEMA_TIMEOUT; | |
306 | ||
307 | return wxSEMA_MISC_ERROR; | |
308 | } | |
309 | ||
310 | return wxSEMA_NO_ERROR; | |
311 | } | |
312 | ||
313 | wxSemaError wxSemaphoreInternal::Post() | |
314 | { | |
315 | OSStatus err = MPSignalSemaphore( m_semaphore ); | |
316 | MPYield(); | |
317 | if (err != noErr) | |
318 | return wxSEMA_MISC_ERROR; | |
319 | ||
320 | return wxSEMA_NO_ERROR; | |
321 | } | |
322 | ||
323 | // ---------------------------------------------------------------------------- | |
324 | // wxCondition implementation | |
325 | // ---------------------------------------------------------------------------- | |
326 | ||
489468fe SC |
327 | class wxConditionInternal |
328 | { | |
329 | public: | |
330 | wxConditionInternal( wxMutex& mutex ); | |
331 | ||
332 | bool IsOk() const | |
333 | { return m_mutex.IsOk() && m_semaphore.IsOk(); } | |
334 | ||
335 | wxCondError Wait(); | |
336 | wxCondError WaitTimeout( unsigned long milliseconds ); | |
337 | ||
338 | wxCondError Signal(); | |
339 | wxCondError Broadcast(); | |
340 | ||
341 | private: | |
342 | // the number of threads currently waiting for this condition | |
343 | SInt32 m_numWaiters; | |
344 | ||
345 | // the critical section protecting m_numWaiters | |
346 | wxCriticalSection m_csWaiters; | |
347 | ||
348 | wxMutex& m_mutex; | |
349 | wxSemaphore m_semaphore; | |
350 | ||
c0c133e1 | 351 | wxDECLARE_NO_COPY_CLASS(wxConditionInternal); |
489468fe SC |
352 | }; |
353 | ||
354 | wxConditionInternal::wxConditionInternal( wxMutex& mutex ) | |
355 | : m_mutex(mutex) | |
356 | { | |
357 | // another thread can't access it until we return from ctor, so no need to | |
358 | // protect access to m_numWaiters here | |
359 | m_numWaiters = 0; | |
360 | } | |
361 | ||
362 | wxCondError wxConditionInternal::Wait() | |
363 | { | |
364 | // increment the number of waiters | |
365 | IncrementAtomic( &m_numWaiters ); | |
366 | ||
367 | m_mutex.Unlock(); | |
368 | ||
369 | // a potential race condition can occur here | |
370 | // | |
371 | // after a thread increments nwaiters, and unlocks the mutex and before the | |
372 | // semaphore.Wait() is called, if another thread can cause a signal to be | |
373 | // generated | |
374 | // | |
375 | // this race condition is handled by using a semaphore and incrementing the | |
376 | // semaphore only if 'nwaiters' is greater that zero since the semaphore, | |
377 | // can 'remember' signals the race condition will not occur | |
378 | ||
379 | // wait ( if necessary ) and decrement semaphore | |
380 | wxSemaError err = m_semaphore.Wait(); | |
381 | m_mutex.Lock(); | |
382 | ||
383 | return err == wxSEMA_NO_ERROR ? wxCOND_NO_ERROR : wxCOND_MISC_ERROR; | |
384 | } | |
385 | ||
386 | wxCondError wxConditionInternal::WaitTimeout( unsigned long milliseconds ) | |
387 | { | |
388 | IncrementAtomic( &m_numWaiters ); | |
389 | ||
390 | m_mutex.Unlock(); | |
391 | ||
392 | // a race condition can occur at this point in the code | |
393 | // | |
394 | // please see the comments in Wait(), for details | |
395 | ||
396 | wxSemaError err = m_semaphore.WaitTimeout(milliseconds); | |
397 | ||
398 | if ( err == wxSEMA_TIMEOUT ) | |
399 | { | |
400 | // another potential race condition exists here it is caused when a | |
401 | // 'waiting' thread timesout, and returns from WaitForSingleObject, but | |
402 | // has not yet decremented 'nwaiters'. | |
403 | // | |
404 | // at this point if another thread calls signal() then the semaphore | |
405 | // will be incremented, but the waiting thread will miss it. | |
406 | // | |
407 | // to handle this particular case, the waiting thread calls | |
408 | // WaitForSingleObject again with a timeout of 0, after locking | |
409 | // 'nwaiters_mutex'. this call does not block because of the zero | |
410 | // timeout, but will allow the waiting thread to catch the missed | |
411 | // signals. | |
412 | wxCriticalSectionLocker lock(m_csWaiters); | |
413 | ||
414 | err = m_semaphore.WaitTimeout(0); | |
415 | ||
416 | if ( err != wxSEMA_NO_ERROR ) | |
417 | { | |
418 | m_numWaiters--; | |
419 | } | |
420 | } | |
421 | ||
422 | m_mutex.Lock(); | |
423 | ||
424 | return err == wxSEMA_NO_ERROR ? wxCOND_NO_ERROR : wxCOND_MISC_ERROR; | |
425 | } | |
426 | ||
427 | wxCondError wxConditionInternal::Signal() | |
428 | { | |
429 | wxCriticalSectionLocker lock(m_csWaiters); | |
430 | ||
431 | if ( m_numWaiters > 0 ) | |
432 | { | |
433 | // increment the semaphore by 1 | |
434 | if ( m_semaphore.Post() != wxSEMA_NO_ERROR ) | |
435 | return wxCOND_MISC_ERROR; | |
436 | ||
437 | m_numWaiters--; | |
438 | } | |
439 | ||
440 | return wxCOND_NO_ERROR; | |
441 | } | |
442 | ||
443 | wxCondError wxConditionInternal::Broadcast() | |
444 | { | |
445 | wxCriticalSectionLocker lock(m_csWaiters); | |
446 | ||
447 | while ( m_numWaiters > 0 ) | |
448 | { | |
449 | if ( m_semaphore.Post() != wxSEMA_NO_ERROR ) | |
450 | return wxCOND_MISC_ERROR; | |
451 | ||
452 | m_numWaiters--; | |
453 | } | |
454 | ||
455 | return wxCOND_NO_ERROR; | |
456 | } | |
489468fe SC |
457 | |
458 | // ---------------------------------------------------------------------------- | |
459 | // wxCriticalSection implementation | |
460 | // ---------------------------------------------------------------------------- | |
461 | ||
462 | // XXX currently implemented as mutex in headers. Change to critical section. | |
463 | ||
464 | // ---------------------------------------------------------------------------- | |
465 | // wxThread implementation | |
466 | // ---------------------------------------------------------------------------- | |
467 | ||
468 | // wxThreadInternal class | |
469 | // ---------------------- | |
470 | ||
471 | class wxThreadInternal | |
472 | { | |
473 | public: | |
474 | wxThreadInternal() | |
475 | { | |
476 | m_tid = kInvalidID; | |
477 | m_state = STATE_NEW; | |
478 | m_prio = WXTHREAD_DEFAULT_PRIORITY; | |
479 | m_notifyQueueId = kInvalidID; | |
480 | m_exitcode = 0; | |
481 | m_cancelled = false ; | |
482 | ||
483 | // set to true only when the thread starts waiting on m_semSuspend | |
484 | m_isPaused = false; | |
485 | ||
486 | // defaults for joinable threads | |
487 | m_shouldBeJoined = true; | |
488 | m_isDetached = false; | |
489 | } | |
490 | ||
491 | virtual ~wxThreadInternal() | |
492 | { | |
493 | if ( m_notifyQueueId) | |
494 | { | |
495 | MPDeleteQueue( m_notifyQueueId ); | |
496 | m_notifyQueueId = kInvalidID ; | |
497 | } | |
498 | } | |
499 | ||
500 | // thread function | |
501 | static OSStatus MacThreadStart(void* arg); | |
502 | ||
503 | // create a new (suspended) thread (for the given thread object) | |
504 | bool Create(wxThread *thread, unsigned int stackSize); | |
505 | ||
506 | // thread actions | |
507 | ||
508 | // start the thread | |
509 | wxThreadError Run(); | |
510 | ||
511 | // unblock the thread allowing it to run | |
512 | void SignalRun() { m_semRun.Post(); } | |
513 | ||
514 | // ask the thread to terminate | |
515 | void Wait(); | |
516 | ||
517 | // go to sleep until Resume() is called | |
518 | void Pause(); | |
519 | ||
520 | // resume the thread | |
521 | void Resume(); | |
522 | ||
523 | // accessors | |
524 | // priority | |
525 | int GetPriority() const | |
526 | { return m_prio; } | |
527 | void SetPriority(int prio); | |
528 | ||
529 | // state | |
530 | wxThreadState GetState() const | |
531 | { return m_state; } | |
532 | void SetState(wxThreadState state) | |
533 | { m_state = state; } | |
534 | ||
535 | // Get the ID of this thread's underlying MP Services task. | |
536 | MPTaskID GetId() const | |
537 | { return m_tid; } | |
538 | ||
539 | void SetCancelFlag() | |
540 | { m_cancelled = true; } | |
541 | ||
542 | bool WasCancelled() const | |
543 | { return m_cancelled; } | |
544 | ||
545 | // exit code | |
546 | void SetExitCode(wxThread::ExitCode exitcode) | |
547 | { m_exitcode = exitcode; } | |
548 | wxThread::ExitCode GetExitCode() const | |
549 | { return m_exitcode; } | |
550 | ||
551 | // the pause flag | |
552 | void SetReallyPaused(bool paused) | |
553 | { m_isPaused = paused; } | |
554 | bool IsReallyPaused() const | |
555 | { return m_isPaused; } | |
556 | ||
557 | // tell the thread that it is a detached one | |
558 | void Detach() | |
559 | { | |
560 | wxCriticalSectionLocker lock(m_csJoinFlag); | |
561 | ||
562 | m_shouldBeJoined = false; | |
563 | m_isDetached = true; | |
564 | } | |
565 | ||
566 | private: | |
567 | // the thread we're associated with | |
568 | wxThread * m_thread; | |
569 | ||
570 | MPTaskID m_tid; // thread id | |
571 | MPQueueID m_notifyQueueId; // its notification queue | |
572 | ||
573 | wxThreadState m_state; // see wxThreadState enum | |
574 | int m_prio; // in wxWidgets units: from 0 to 100 | |
575 | ||
576 | // this flag is set when the thread should terminate | |
577 | bool m_cancelled; | |
578 | ||
579 | // this flag is set when the thread is blocking on m_semSuspend | |
580 | bool m_isPaused; | |
581 | ||
582 | // the thread exit code - only used for joinable (!detached) threads and | |
583 | // is only valid after the thread termination | |
584 | wxThread::ExitCode m_exitcode; | |
585 | ||
586 | // many threads may call Wait(), but only one of them should call | |
587 | // pthread_join(), so we have to keep track of this | |
588 | wxCriticalSection m_csJoinFlag; | |
589 | bool m_shouldBeJoined; | |
590 | bool m_isDetached; | |
591 | ||
592 | // this semaphore is posted by Run() and the threads Entry() is not | |
593 | // called before it is done | |
594 | wxSemaphore m_semRun; | |
595 | ||
596 | // this one is signaled when the thread should resume after having been | |
597 | // Pause()d | |
598 | wxSemaphore m_semSuspend; | |
599 | }; | |
600 | ||
601 | OSStatus wxThreadInternal::MacThreadStart(void *parameter) | |
602 | { | |
603 | wxThread* thread = (wxThread*) parameter ; | |
604 | wxThreadInternal *pthread = thread->m_internal; | |
605 | ||
606 | // add to TLS so that This() will work | |
607 | verify_noerr( MPSetTaskStorageValue( gs_tlsForWXThread , (TaskStorageValue) thread ) ) ; | |
608 | ||
609 | // have to declare this before pthread_cleanup_push() which defines a | |
610 | // block! | |
611 | bool dontRunAtAll; | |
612 | ||
613 | // wait for the semaphore to be posted from Run() | |
614 | pthread->m_semRun.Wait(); | |
615 | ||
616 | // test whether we should run the run at all - may be it was deleted | |
617 | // before it started to Run()? | |
618 | { | |
619 | wxCriticalSectionLocker lock(thread->m_critsect); | |
620 | ||
621 | dontRunAtAll = pthread->GetState() == STATE_NEW && | |
622 | pthread->WasCancelled(); | |
623 | } | |
624 | ||
625 | if ( !dontRunAtAll ) | |
626 | { | |
627 | pthread->m_exitcode = thread->Entry(); | |
628 | ||
629 | { | |
630 | wxCriticalSectionLocker lock(thread->m_critsect); | |
631 | pthread->SetState( STATE_EXITED ); | |
632 | } | |
633 | } | |
634 | ||
635 | if ( dontRunAtAll ) | |
636 | { | |
637 | if ( pthread->m_isDetached ) | |
638 | delete thread; | |
639 | ||
640 | return -1; | |
641 | } | |
642 | else | |
643 | { | |
644 | // on Mac for the running code, | |
645 | // the correct thread termination is to return | |
646 | ||
647 | // terminate the thread | |
648 | thread->Exit( pthread->m_exitcode ); | |
649 | ||
650 | return (OSStatus) NULL; // pthread->m_exitcode; | |
651 | } | |
652 | } | |
653 | ||
654 | bool wxThreadInternal::Create( wxThread *thread, unsigned int stackSize ) | |
655 | { | |
656 | wxASSERT_MSG( m_state == STATE_NEW && !m_tid, | |
657 | wxT("Create()ing thread twice?") ); | |
658 | ||
659 | OSStatus err = noErr; | |
660 | m_thread = thread; | |
661 | ||
662 | if ( m_notifyQueueId == kInvalidID ) | |
663 | { | |
664 | OSStatus err = MPCreateQueue( &m_notifyQueueId ); | |
665 | if (err != noErr) | |
666 | { | |
3d167787 | 667 | wxLogSysError( wxT("Can't create the thread event queue") ); |
489468fe SC |
668 | |
669 | return false; | |
670 | } | |
671 | } | |
672 | ||
673 | m_state = STATE_NEW; | |
674 | ||
675 | err = MPCreateTask( | |
676 | MacThreadStart, (void*)m_thread, stackSize, | |
677 | m_notifyQueueId, &m_exitcode, 0, 0, &m_tid ); | |
678 | ||
679 | if (err != noErr) | |
680 | { | |
681 | wxLogSysError( wxT("Can't create thread") ); | |
682 | ||
683 | return false; | |
684 | } | |
685 | ||
686 | if ( m_prio != WXTHREAD_DEFAULT_PRIORITY ) | |
687 | SetPriority( m_prio ); | |
688 | ||
689 | return true; | |
690 | } | |
691 | ||
692 | void wxThreadInternal::SetPriority( int priority ) | |
693 | { | |
694 | m_prio = priority; | |
695 | ||
696 | if (m_tid) | |
697 | { | |
698 | // Mac priorities range from 1 to 10,000, with a default of 100. | |
699 | // wxWidgets priorities range from 0 to 100 with a default of 50. | |
700 | // We can map wxWidgets to Mac priorities easily by assuming | |
701 | // the former uses a logarithmic scale. | |
702 | const unsigned int macPriority = (int)( exp( priority / 25.0 * log( 10.0)) + 0.5); | |
703 | ||
704 | MPSetTaskWeight( m_tid, macPriority ); | |
705 | } | |
706 | } | |
707 | ||
708 | wxThreadError wxThreadInternal::Run() | |
709 | { | |
710 | wxCHECK_MSG( GetState() == STATE_NEW, wxTHREAD_RUNNING, | |
711 | wxT("thread may only be started once after Create()") ); | |
712 | ||
713 | SetState( STATE_RUNNING ); | |
714 | ||
715 | // wake up threads waiting for our start | |
716 | SignalRun(); | |
717 | ||
718 | return wxTHREAD_NO_ERROR; | |
719 | } | |
720 | ||
721 | void wxThreadInternal::Wait() | |
722 | { | |
723 | wxCHECK_RET( !m_isDetached, wxT("can't wait for a detached thread") ); | |
724 | ||
725 | // if the thread we're waiting for is waiting for the GUI mutex, we will | |
726 | // deadlock so make sure we release it temporarily | |
727 | if ( wxThread::IsMain() ) | |
728 | { | |
729 | // give the thread we're waiting for chance to do the GUI call | |
730 | // it might be in, we don't do this conditionally as the to be waited on | |
731 | // thread might have to acquire the mutex later but before terminating | |
732 | if ( wxGuiOwnedByMainThread() ) | |
733 | wxMutexGuiLeave(); | |
734 | } | |
735 | ||
736 | { | |
737 | wxCriticalSectionLocker lock(m_csJoinFlag); | |
738 | ||
739 | if ( m_shouldBeJoined ) | |
740 | { | |
741 | void *param1, *param2, *rc; | |
742 | ||
743 | OSStatus err = MPWaitOnQueue( | |
744 | m_notifyQueueId, | |
745 | ¶m1, | |
746 | ¶m2, | |
747 | &rc, | |
748 | kDurationForever ); | |
749 | if (err != noErr) | |
750 | { | |
751 | wxLogSysError( wxT( "Cannot wait for thread termination.")); | |
752 | rc = (void*) -1; | |
753 | } | |
754 | ||
755 | // actually param1 would be the address of m_exitcode | |
756 | // but we don't need this here | |
757 | m_exitcode = rc; | |
758 | ||
759 | m_shouldBeJoined = false; | |
760 | } | |
761 | } | |
762 | } | |
763 | ||
764 | void wxThreadInternal::Pause() | |
765 | { | |
766 | // the state is set from the thread which pauses us first, this function | |
767 | // is called later so the state should have been already set | |
768 | wxCHECK_RET( m_state == STATE_PAUSED, | |
769 | wxT("thread must first be paused with wxThread::Pause().") ); | |
770 | ||
771 | // wait until the semaphore is Post()ed from Resume() | |
772 | m_semSuspend.Wait(); | |
773 | } | |
774 | ||
775 | void wxThreadInternal::Resume() | |
776 | { | |
777 | wxCHECK_RET( m_state == STATE_PAUSED, | |
778 | wxT("can't resume thread which is not suspended.") ); | |
779 | ||
780 | // the thread might be not actually paused yet - if there were no call to | |
781 | // TestDestroy() since the last call to Pause() for example | |
782 | if ( IsReallyPaused() ) | |
783 | { | |
784 | // wake up Pause() | |
785 | m_semSuspend.Post(); | |
786 | ||
787 | // reset the flag | |
788 | SetReallyPaused( false ); | |
789 | } | |
790 | ||
791 | SetState( STATE_RUNNING ); | |
792 | } | |
793 | ||
794 | // static functions | |
795 | // ---------------- | |
796 | ||
797 | wxThread *wxThread::This() | |
798 | { | |
799 | wxThread* thr = (wxThread*) MPGetTaskStorageValue( gs_tlsForWXThread ) ; | |
800 | ||
801 | return thr; | |
802 | } | |
803 | ||
489468fe SC |
804 | #ifdef Yield |
805 | #undef Yield | |
806 | #endif | |
807 | ||
808 | void wxThread::Yield() | |
809 | { | |
810 | CFRunLoopRunInMode( kCFRunLoopDefaultMode , 0 , true ) ; | |
811 | ||
812 | MPYield(); | |
813 | } | |
814 | ||
815 | void wxThread::Sleep( unsigned long milliseconds ) | |
816 | { | |
817 | AbsoluteTime wakeup = AddDurationToAbsolute( milliseconds, UpTime() ); | |
818 | MPDelayUntil( &wakeup ); | |
819 | } | |
820 | ||
821 | int wxThread::GetCPUCount() | |
822 | { | |
823 | return MPProcessors(); | |
824 | } | |
825 | ||
826 | unsigned long wxThread::GetCurrentId() | |
827 | { | |
828 | return (unsigned long)MPCurrentTaskID(); | |
829 | } | |
830 | ||
831 | bool wxThread::SetConcurrency( size_t WXUNUSED(level) ) | |
832 | { | |
833 | // Cannot be set in MacOS. | |
834 | return false; | |
835 | } | |
836 | ||
837 | wxThread::wxThread( wxThreadKind kind ) | |
838 | { | |
839 | g_numberOfThreads++; | |
840 | m_internal = new wxThreadInternal(); | |
841 | ||
842 | m_isDetached = (kind == wxTHREAD_DETACHED); | |
843 | } | |
844 | ||
845 | wxThread::~wxThread() | |
846 | { | |
847 | wxASSERT_MSG( g_numberOfThreads>0 , wxT("More threads deleted than created.") ) ; | |
848 | ||
849 | g_numberOfThreads--; | |
850 | ||
489468fe SC |
851 | m_critsect.Enter(); |
852 | ||
853 | // check that the thread either exited or couldn't be created | |
854 | if ( m_internal->GetState() != STATE_EXITED && | |
855 | m_internal->GetState() != STATE_NEW ) | |
856 | { | |
857 | wxLogDebug( | |
858 | wxT("The thread %ld is being destroyed although it is still running! The application may crash."), | |
859 | GetId() ); | |
860 | } | |
861 | ||
862 | m_critsect.Leave(); | |
489468fe SC |
863 | |
864 | wxDELETE( m_internal ) ; | |
865 | } | |
866 | ||
867 | wxThreadError wxThread::Create( unsigned int stackSize ) | |
868 | { | |
869 | wxCriticalSectionLocker lock(m_critsect); | |
870 | ||
871 | if ( m_isDetached ) | |
872 | m_internal->Detach() ; | |
873 | ||
874 | if ( !m_internal->Create(this, stackSize) ) | |
875 | { | |
876 | m_internal->SetState( STATE_EXITED ); | |
877 | ||
878 | return wxTHREAD_NO_RESOURCE; | |
879 | } | |
880 | ||
881 | return wxTHREAD_NO_ERROR; | |
882 | } | |
883 | ||
884 | wxThreadError wxThread::Run() | |
885 | { | |
886 | wxCriticalSectionLocker lock(m_critsect); | |
887 | ||
888 | wxCHECK_MSG( m_internal->GetId(), wxTHREAD_MISC_ERROR, | |
889 | wxT("must call wxThread::Create() first") ); | |
890 | ||
891 | return m_internal->Run(); | |
892 | } | |
893 | ||
894 | // ----------------------------------------------------------------------------- | |
895 | // pause/resume | |
896 | // ----------------------------------------------------------------------------- | |
897 | ||
898 | wxThreadError wxThread::Pause() | |
899 | { | |
900 | wxCHECK_MSG( This() != this, wxTHREAD_MISC_ERROR, | |
9a83f860 | 901 | wxT("a thread can't pause itself") ); |
489468fe SC |
902 | |
903 | wxCriticalSectionLocker lock(m_critsect); | |
904 | ||
905 | if ( m_internal->GetState() != STATE_RUNNING ) | |
906 | { | |
907 | wxLogDebug( wxT("Can't pause thread which is not running.") ); | |
908 | ||
909 | return wxTHREAD_NOT_RUNNING; | |
910 | } | |
911 | ||
912 | // just set a flag, the thread will be really paused only during the next | |
913 | // call to TestDestroy() | |
914 | m_internal->SetState( STATE_PAUSED ); | |
915 | ||
916 | return wxTHREAD_NO_ERROR; | |
917 | } | |
918 | ||
919 | wxThreadError wxThread::Resume() | |
920 | { | |
921 | wxCHECK_MSG( This() != this, wxTHREAD_MISC_ERROR, | |
922 | wxT("a thread can't resume itself") ); | |
923 | ||
924 | wxCriticalSectionLocker lock(m_critsect); | |
925 | ||
926 | wxThreadState state = m_internal->GetState(); | |
927 | ||
928 | switch ( state ) | |
929 | { | |
930 | case STATE_PAUSED: | |
931 | m_internal->Resume(); | |
932 | return wxTHREAD_NO_ERROR; | |
933 | ||
934 | case STATE_EXITED: | |
935 | return wxTHREAD_NO_ERROR; | |
936 | ||
937 | default: | |
938 | wxLogDebug( wxT("Attempt to resume a thread which is not paused.") ); | |
939 | ||
940 | return wxTHREAD_MISC_ERROR; | |
941 | } | |
942 | } | |
943 | ||
944 | // ----------------------------------------------------------------------------- | |
945 | // exiting thread | |
946 | // ----------------------------------------------------------------------------- | |
947 | ||
b95a7c31 | 948 | wxThread::ExitCode wxThread::Wait(wxThreadWait WXUNUSED(waitMode)) |
489468fe SC |
949 | { |
950 | wxCHECK_MSG( This() != this, (ExitCode)-1, | |
951 | wxT("a thread can't wait for itself") ); | |
952 | ||
953 | wxCHECK_MSG( !m_isDetached, (ExitCode)-1, | |
954 | wxT("can't wait for detached thread") ); | |
955 | ||
956 | m_internal->Wait(); | |
957 | ||
958 | return m_internal->GetExitCode(); | |
959 | } | |
960 | ||
b95a7c31 | 961 | wxThreadError wxThread::Delete(ExitCode *rc, wxThreadWait WXUNUSED(waitMode)) |
489468fe SC |
962 | { |
963 | wxCHECK_MSG( This() != this, wxTHREAD_MISC_ERROR, | |
964 | wxT("a thread can't delete itself") ); | |
965 | ||
966 | bool isDetached = m_isDetached; | |
967 | ||
968 | m_critsect.Enter(); | |
969 | wxThreadState state = m_internal->GetState(); | |
970 | ||
971 | // ask the thread to stop | |
972 | m_internal->SetCancelFlag(); | |
973 | ||
974 | m_critsect.Leave(); | |
975 | ||
976 | switch ( state ) | |
977 | { | |
978 | case STATE_NEW: | |
979 | // we need to wake up the thread so that PthreadStart() will | |
980 | // terminate - right now it's blocking on run semaphore in | |
981 | // PthreadStart() | |
982 | m_internal->SignalRun(); | |
983 | ||
984 | // fall through | |
985 | ||
986 | case STATE_EXITED: | |
987 | // nothing to do | |
988 | break; | |
989 | ||
990 | case STATE_PAUSED: | |
991 | // resume the thread first | |
992 | m_internal->Resume(); | |
993 | ||
994 | // fall through | |
995 | ||
996 | default: | |
997 | if ( !isDetached ) | |
998 | { | |
999 | // wait until the thread stops | |
1000 | m_internal->Wait(); | |
1001 | ||
1002 | if ( rc ) | |
1003 | { | |
1004 | // return the exit code of the thread | |
1005 | *rc = m_internal->GetExitCode(); | |
1006 | } | |
1007 | } | |
1008 | } | |
1009 | ||
1010 | return wxTHREAD_NO_ERROR; | |
1011 | } | |
1012 | ||
1013 | wxThreadError wxThread::Kill() | |
1014 | { | |
1015 | wxCHECK_MSG( This() != this, wxTHREAD_MISC_ERROR, | |
1016 | wxT("a thread can't kill itself") ); | |
1017 | ||
1018 | switch ( m_internal->GetState() ) | |
1019 | { | |
1020 | case STATE_NEW: | |
1021 | case STATE_EXITED: | |
1022 | return wxTHREAD_NOT_RUNNING; | |
1023 | ||
1024 | case STATE_PAUSED: | |
1025 | // resume the thread first | |
1026 | Resume(); | |
1027 | ||
1028 | // fall through | |
1029 | ||
1030 | default: | |
1031 | OSStatus err = MPTerminateTask( m_internal->GetId() , -1 ) ; | |
1032 | if (err != noErr) | |
1033 | { | |
1034 | wxLogError( wxT("Failed to terminate a thread.") ); | |
1035 | ||
1036 | return wxTHREAD_MISC_ERROR; | |
1037 | } | |
1038 | ||
1039 | if ( m_isDetached ) | |
1040 | { | |
1041 | delete this ; | |
1042 | } | |
1043 | else | |
1044 | { | |
1045 | // this should be retrieved by Wait actually | |
1046 | m_internal->SetExitCode( (void*)-1 ); | |
1047 | } | |
1048 | ||
1049 | return wxTHREAD_NO_ERROR; | |
1050 | } | |
1051 | } | |
1052 | ||
1053 | void wxThread::Exit( ExitCode status ) | |
1054 | { | |
1055 | wxASSERT_MSG( This() == this, | |
1056 | wxT("wxThread::Exit() can only be called in the context of the same thread") ); | |
1057 | ||
1058 | // don't enter m_critsect before calling OnExit() because the user code | |
1059 | // might deadlock if, for example, it signals a condition in OnExit() (a | |
1060 | // common case) while the main thread calls any of functions entering | |
1061 | // m_critsect on us (almost all of them do) | |
1062 | OnExit(); | |
1063 | ||
1064 | MPTaskID threadid = m_internal->GetId(); | |
1065 | ||
1066 | if ( IsDetached() ) | |
1067 | { | |
1068 | delete this; | |
1069 | } | |
1070 | else // joinable | |
1071 | { | |
1072 | // update the status of the joinable thread | |
1073 | wxCriticalSectionLocker lock( m_critsect ); | |
1074 | m_internal->SetState( STATE_EXITED ); | |
1075 | } | |
1076 | ||
1077 | MPTerminateTask( threadid, (long)status ); | |
1078 | } | |
1079 | ||
1080 | // also test whether we were paused | |
1081 | bool wxThread::TestDestroy() | |
1082 | { | |
1083 | wxASSERT_MSG( This() == this, | |
1084 | wxT("wxThread::TestDestroy() can only be called in the context of the same thread") ); | |
1085 | ||
1086 | m_critsect.Enter(); | |
1087 | ||
1088 | if ( m_internal->GetState() == STATE_PAUSED ) | |
1089 | { | |
1090 | m_internal->SetReallyPaused( true ); | |
1091 | ||
1092 | // leave the crit section or the other threads will stop too if they attempt | |
1093 | // to call any of (seemingly harmless) IsXXX() functions while we sleep | |
1094 | m_critsect.Leave(); | |
1095 | ||
1096 | m_internal->Pause(); | |
1097 | } | |
1098 | else | |
1099 | { | |
1100 | // thread wasn't requested to pause, nothing to do | |
1101 | m_critsect.Leave(); | |
1102 | } | |
1103 | ||
1104 | return m_internal->WasCancelled(); | |
1105 | } | |
1106 | ||
1107 | // ----------------------------------------------------------------------------- | |
1108 | // priority setting | |
1109 | // ----------------------------------------------------------------------------- | |
1110 | ||
1111 | void wxThread::SetPriority(unsigned int prio) | |
1112 | { | |
1113 | wxCHECK_RET( ((int)WXTHREAD_MIN_PRIORITY <= (int)prio) && | |
1114 | ((int)prio <= (int)WXTHREAD_MAX_PRIORITY), | |
1115 | wxT("invalid thread priority") ); | |
1116 | ||
1117 | wxCriticalSectionLocker lock(m_critsect); | |
1118 | ||
1119 | switch ( m_internal->GetState() ) | |
1120 | { | |
1121 | case STATE_RUNNING: | |
1122 | case STATE_PAUSED: | |
1123 | case STATE_NEW: | |
1124 | // thread not yet started, priority will be set when it is | |
1125 | m_internal->SetPriority( prio ); | |
1126 | break; | |
1127 | ||
1128 | case STATE_EXITED: | |
1129 | default: | |
1130 | wxFAIL_MSG( wxT("impossible to set thread priority in this state") ); | |
1131 | } | |
1132 | } | |
1133 | ||
1134 | unsigned int wxThread::GetPriority() const | |
1135 | { | |
f48a1159 | 1136 | wxCriticalSectionLocker lock(const_cast<wxCriticalSection &>(m_critsect)); |
489468fe SC |
1137 | |
1138 | return m_internal->GetPriority(); | |
1139 | } | |
1140 | ||
1141 | unsigned long wxThread::GetId() const | |
1142 | { | |
f48a1159 | 1143 | wxCriticalSectionLocker lock(const_cast<wxCriticalSection &>(m_critsect)); |
489468fe SC |
1144 | |
1145 | return (unsigned long)m_internal->GetId(); | |
1146 | } | |
1147 | ||
1148 | // ----------------------------------------------------------------------------- | |
1149 | // state tests | |
1150 | // ----------------------------------------------------------------------------- | |
1151 | ||
1152 | bool wxThread::IsRunning() const | |
1153 | { | |
1154 | wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect); | |
1155 | ||
1156 | return m_internal->GetState() == STATE_RUNNING; | |
1157 | } | |
1158 | ||
1159 | bool wxThread::IsAlive() const | |
1160 | { | |
1161 | wxCriticalSectionLocker lock((wxCriticalSection&)m_critsect); | |
1162 | ||
1163 | switch ( m_internal->GetState() ) | |
1164 | { | |
1165 | case STATE_RUNNING: | |
1166 | case STATE_PAUSED: | |
1167 | return true; | |
1168 | ||
1169 | default: | |
1170 | return false; | |
1171 | } | |
1172 | } | |
1173 | ||
1174 | bool wxThread::IsPaused() const | |
1175 | { | |
1176 | wxCriticalSectionLocker lock((wxCriticalSection&)m_critsect); | |
1177 | ||
1178 | return (m_internal->GetState() == STATE_PAUSED); | |
1179 | } | |
1180 | ||
1181 | // ---------------------------------------------------------------------------- | |
1182 | // Automatic initialization for thread module | |
1183 | // ---------------------------------------------------------------------------- | |
1184 | ||
1185 | class wxThreadModule : public wxModule | |
1186 | { | |
1187 | public: | |
1188 | virtual bool OnInit(); | |
1189 | virtual void OnExit(); | |
1190 | ||
1191 | private: | |
1192 | DECLARE_DYNAMIC_CLASS(wxThreadModule) | |
1193 | }; | |
1194 | ||
1195 | IMPLEMENT_DYNAMIC_CLASS(wxThreadModule, wxModule) | |
1196 | ||
1197 | bool wxThreadModule::OnInit() | |
1198 | { | |
03647350 VZ |
1199 | bool hasThreadManager = |
1200 | #ifdef __LP64__ | |
489468fe SC |
1201 | true ; // TODO VERIFY IN NEXT BUILD |
1202 | #else | |
1203 | MPLibraryIsLoaded(); | |
1204 | #endif | |
1205 | ||
1206 | if ( !hasThreadManager ) | |
1207 | { | |
1208 | wxLogError( wxT("MP thread support is not available on this system" ) ) ; | |
1209 | ||
1210 | return false; | |
1211 | } | |
1212 | ||
1213 | // main thread's This() is NULL | |
1214 | verify_noerr( MPAllocateTaskStorageIndex( &gs_tlsForWXThread ) ) ; | |
1215 | verify_noerr( MPSetTaskStorageValue( gs_tlsForWXThread, 0 ) ) ; | |
1216 | ||
f9226383 | 1217 | wxThread::ms_idMainThread = wxThread::GetCurrentId(); |
489468fe SC |
1218 | gs_critsectWaitingForGui = new wxCriticalSection(); |
1219 | ||
1220 | gs_critsectGui = new wxCriticalSection(); | |
1221 | gs_critsectGui->Enter(); | |
1222 | ||
1223 | return true; | |
1224 | } | |
1225 | ||
1226 | void wxThreadModule::OnExit() | |
1227 | { | |
1228 | if ( gs_critsectGui ) | |
1229 | { | |
1230 | if ( !wxGuiOwnedByMainThread() ) | |
1231 | { | |
1232 | gs_critsectGui->Enter(); | |
1233 | gs_bGuiOwnedByMainThread = true; | |
1234 | } | |
1235 | ||
1236 | gs_critsectGui->Leave(); | |
5276b0a5 | 1237 | wxDELETE(gs_critsectGui); |
489468fe SC |
1238 | } |
1239 | ||
5276b0a5 | 1240 | wxDELETE(gs_critsectWaitingForGui); |
489468fe SC |
1241 | } |
1242 | ||
1243 | // ---------------------------------------------------------------------------- | |
1244 | // GUI Serialization copied from MSW implementation | |
1245 | // ---------------------------------------------------------------------------- | |
1246 | ||
1247 | void wxMutexGuiEnterImpl() | |
1248 | { | |
1249 | // this would dead lock everything... | |
1250 | wxASSERT_MSG( !wxThread::IsMain(), | |
1251 | wxT("main thread doesn't want to block in wxMutexGuiEnter()!") ); | |
1252 | ||
1253 | // the order in which we enter the critical sections here is crucial!! | |
1254 | ||
1255 | // set the flag telling to the main thread that we want to do some GUI | |
1256 | { | |
1257 | wxCriticalSectionLocker enter(*gs_critsectWaitingForGui); | |
1258 | ||
1259 | gs_nWaitingForGui++; | |
1260 | } | |
1261 | ||
1262 | wxWakeUpMainThread(); | |
1263 | ||
1264 | // now we may block here because the main thread will soon let us in | |
1265 | // (during the next iteration of OnIdle()) | |
1266 | gs_critsectGui->Enter(); | |
1267 | } | |
1268 | ||
1269 | void wxMutexGuiLeaveImpl() | |
1270 | { | |
1271 | wxCriticalSectionLocker enter(*gs_critsectWaitingForGui); | |
1272 | ||
1273 | if ( wxThread::IsMain() ) | |
1274 | { | |
1275 | gs_bGuiOwnedByMainThread = false; | |
1276 | } | |
1277 | else | |
1278 | { | |
1279 | // decrement the number of threads waiting for GUI access now | |
1280 | wxASSERT_MSG( gs_nWaitingForGui > 0, | |
1281 | wxT("calling wxMutexGuiLeave() without entering it first?") ); | |
1282 | ||
1283 | gs_nWaitingForGui--; | |
1284 | ||
1285 | wxWakeUpMainThread(); | |
1286 | } | |
1287 | ||
1288 | gs_critsectGui->Leave(); | |
1289 | } | |
1290 | ||
1291 | void WXDLLIMPEXP_BASE wxMutexGuiLeaveOrEnter() | |
1292 | { | |
1293 | wxASSERT_MSG( wxThread::IsMain(), | |
1294 | wxT("only main thread may call wxMutexGuiLeaveOrEnter()!") ); | |
1295 | ||
1296 | if ( !gs_critsectWaitingForGui ) | |
1297 | return; | |
1298 | ||
1299 | wxCriticalSectionLocker enter(*gs_critsectWaitingForGui); | |
1300 | ||
1301 | if ( gs_nWaitingForGui == 0 ) | |
1302 | { | |
1303 | // no threads are waiting for GUI - so we may acquire the lock without | |
1304 | // any danger (but only if we don't already have it) | |
1305 | if ( !wxGuiOwnedByMainThread() ) | |
1306 | { | |
1307 | gs_critsectGui->Enter(); | |
1308 | ||
1309 | gs_bGuiOwnedByMainThread = true; | |
1310 | } | |
1311 | //else: already have it, nothing to do | |
1312 | } | |
1313 | else | |
1314 | { | |
1315 | // some threads are waiting, release the GUI lock if we have it | |
1316 | if ( wxGuiOwnedByMainThread() ) | |
1317 | wxMutexGuiLeave(); | |
1318 | //else: some other worker thread is doing GUI | |
1319 | } | |
1320 | } | |
1321 | ||
1322 | bool WXDLLIMPEXP_BASE wxGuiOwnedByMainThread() | |
1323 | { | |
1324 | return gs_bGuiOwnedByMainThread; | |
1325 | } | |
1326 | ||
1327 | // wake up the main thread | |
1328 | void WXDLLEXPORT wxWakeUpMainThread() | |
1329 | { | |
1330 | wxMacWakeUp(); | |
1331 | } | |
1332 | ||
1333 | // ---------------------------------------------------------------------------- | |
1334 | // include common implementation code | |
1335 | // ---------------------------------------------------------------------------- | |
1336 | ||
1337 | #include "wx/thrimpl.cpp" | |
1338 | ||
1339 | #endif // wxUSE_THREADS |