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1 | ///////////////////////////////////////////////////////////////////////////// | |
2 | // Name: src/msw/thread.cpp | |
3 | // Purpose: wxThread Implementation | |
4 | // Author: Original from Wolfram Gloger/Guilhem Lavaux | |
5 | // Modified by: Vadim Zeitlin to make it work :-) | |
6 | // Created: 04/22/98 | |
7 | // RCS-ID: $Id$ | |
8 | // Copyright: (c) Wolfram Gloger (1996, 1997), Guilhem Lavaux (1998); | |
9 | // Vadim Zeitlin (1999-2002) | |
10 | // Licence: wxWindows licence | |
11 | ///////////////////////////////////////////////////////////////////////////// | |
12 | ||
13 | // ---------------------------------------------------------------------------- | |
14 | // headers | |
15 | // ---------------------------------------------------------------------------- | |
16 | ||
17 | // For compilers that support precompilation, includes "wx.h". | |
18 | #include "wx/wxprec.h" | |
19 | ||
20 | #if defined(__BORLANDC__) | |
21 | #pragma hdrstop | |
22 | #endif | |
23 | ||
24 | #if wxUSE_THREADS | |
25 | ||
26 | #include "wx/thread.h" | |
27 | ||
28 | #ifndef WX_PRECOMP | |
29 | #include "wx/intl.h" | |
30 | #include "wx/app.h" | |
31 | #include "wx/module.h" | |
32 | #endif | |
33 | ||
34 | #include "wx/apptrait.h" | |
35 | #include "wx/scopeguard.h" | |
36 | ||
37 | #include "wx/msw/private.h" | |
38 | #include "wx/msw/missing.h" | |
39 | #include "wx/msw/seh.h" | |
40 | ||
41 | #include "wx/except.h" | |
42 | ||
43 | // must have this symbol defined to get _beginthread/_endthread declarations | |
44 | #ifndef _MT | |
45 | #define _MT | |
46 | #endif | |
47 | ||
48 | #if defined(__BORLANDC__) | |
49 | #if !defined(__MT__) | |
50 | // I can't set -tWM in the IDE (anyone?) so have to do this | |
51 | #define __MT__ | |
52 | #endif | |
53 | ||
54 | #if !defined(__MFC_COMPAT__) | |
55 | // Needed to know about _beginthreadex etc.. | |
56 | #define __MFC_COMPAT__ | |
57 | #endif | |
58 | #endif // BC++ | |
59 | ||
60 | // define wxUSE_BEGIN_THREAD if the compiler has _beginthreadex() function | |
61 | // which should be used instead of Win32 ::CreateThread() if possible | |
62 | #if defined(__VISUALC__) || \ | |
63 | (defined(__BORLANDC__) && (__BORLANDC__ >= 0x500)) || \ | |
64 | (defined(__GNUG__) && defined(__MSVCRT__)) || \ | |
65 | defined(__WATCOMC__) || defined(__MWERKS__) | |
66 | ||
67 | #ifndef __WXWINCE__ | |
68 | #undef wxUSE_BEGIN_THREAD | |
69 | #define wxUSE_BEGIN_THREAD | |
70 | #endif | |
71 | ||
72 | #endif | |
73 | ||
74 | #ifdef wxUSE_BEGIN_THREAD | |
75 | // this is where _beginthreadex() is declared | |
76 | #include <process.h> | |
77 | ||
78 | // the return type of the thread function entry point: notice that this | |
79 | // type can't hold a pointer under Win64 | |
80 | typedef unsigned THREAD_RETVAL; | |
81 | ||
82 | // the calling convention of the thread function entry point | |
83 | #define THREAD_CALLCONV __stdcall | |
84 | #else | |
85 | // the settings for CreateThread() | |
86 | typedef DWORD THREAD_RETVAL; | |
87 | #define THREAD_CALLCONV WINAPI | |
88 | #endif | |
89 | ||
90 | static const THREAD_RETVAL THREAD_ERROR_EXIT = (THREAD_RETVAL)-1; | |
91 | ||
92 | // ---------------------------------------------------------------------------- | |
93 | // constants | |
94 | // ---------------------------------------------------------------------------- | |
95 | ||
96 | // the possible states of the thread ("=>" shows all possible transitions from | |
97 | // this state) | |
98 | enum wxThreadState | |
99 | { | |
100 | STATE_NEW, // didn't start execution yet (=> RUNNING) | |
101 | STATE_RUNNING, // thread is running (=> PAUSED, CANCELED) | |
102 | STATE_PAUSED, // thread is temporarily suspended (=> RUNNING) | |
103 | STATE_CANCELED, // thread should terminate a.s.a.p. (=> EXITED) | |
104 | STATE_EXITED // thread is terminating | |
105 | }; | |
106 | ||
107 | // ---------------------------------------------------------------------------- | |
108 | // this module globals | |
109 | // ---------------------------------------------------------------------------- | |
110 | ||
111 | // TLS index of the slot where we store the pointer to the current thread | |
112 | static DWORD gs_tlsThisThread = 0xFFFFFFFF; | |
113 | ||
114 | // id of the main thread - the one which can call GUI functions without first | |
115 | // calling wxMutexGuiEnter() | |
116 | static DWORD gs_idMainThread = 0; | |
117 | ||
118 | // if it's false, some secondary thread is holding the GUI lock | |
119 | static bool gs_bGuiOwnedByMainThread = true; | |
120 | ||
121 | // critical section which controls access to all GUI functions: any secondary | |
122 | // thread (i.e. except the main one) must enter this crit section before doing | |
123 | // any GUI calls | |
124 | static wxCriticalSection *gs_critsectGui = NULL; | |
125 | ||
126 | // critical section which protects gs_nWaitingForGui variable | |
127 | static wxCriticalSection *gs_critsectWaitingForGui = NULL; | |
128 | ||
129 | // critical section which serializes WinThreadStart() and WaitForTerminate() | |
130 | // (this is a potential bottleneck, we use a single crit sect for all threads | |
131 | // in the system, but normally time spent inside it should be quite short) | |
132 | static wxCriticalSection *gs_critsectThreadDelete = NULL; | |
133 | ||
134 | // number of threads waiting for GUI in wxMutexGuiEnter() | |
135 | static size_t gs_nWaitingForGui = 0; | |
136 | ||
137 | // are we waiting for a thread termination? | |
138 | static bool gs_waitingForThread = false; | |
139 | ||
140 | // ============================================================================ | |
141 | // Windows implementation of thread and related classes | |
142 | // ============================================================================ | |
143 | ||
144 | // ---------------------------------------------------------------------------- | |
145 | // wxCriticalSection | |
146 | // ---------------------------------------------------------------------------- | |
147 | ||
148 | wxCriticalSection::wxCriticalSection( wxCriticalSectionType WXUNUSED(critSecType) ) | |
149 | { | |
150 | wxCOMPILE_TIME_ASSERT( sizeof(CRITICAL_SECTION) <= sizeof(wxCritSectBuffer), | |
151 | wxCriticalSectionBufferTooSmall ); | |
152 | ||
153 | ::InitializeCriticalSection((CRITICAL_SECTION *)m_buffer); | |
154 | } | |
155 | ||
156 | wxCriticalSection::~wxCriticalSection() | |
157 | { | |
158 | ::DeleteCriticalSection((CRITICAL_SECTION *)m_buffer); | |
159 | } | |
160 | ||
161 | void wxCriticalSection::Enter() | |
162 | { | |
163 | ::EnterCriticalSection((CRITICAL_SECTION *)m_buffer); | |
164 | } | |
165 | ||
166 | void wxCriticalSection::Leave() | |
167 | { | |
168 | ::LeaveCriticalSection((CRITICAL_SECTION *)m_buffer); | |
169 | } | |
170 | ||
171 | // ---------------------------------------------------------------------------- | |
172 | // wxMutex | |
173 | // ---------------------------------------------------------------------------- | |
174 | ||
175 | class wxMutexInternal | |
176 | { | |
177 | public: | |
178 | wxMutexInternal(wxMutexType mutexType); | |
179 | ~wxMutexInternal(); | |
180 | ||
181 | bool IsOk() const { return m_mutex != NULL; } | |
182 | ||
183 | wxMutexError Lock() { return LockTimeout(INFINITE); } | |
184 | wxMutexError Lock(unsigned long ms) { return LockTimeout(ms); } | |
185 | wxMutexError TryLock(); | |
186 | wxMutexError Unlock(); | |
187 | ||
188 | private: | |
189 | wxMutexError LockTimeout(DWORD milliseconds); | |
190 | ||
191 | HANDLE m_mutex; | |
192 | ||
193 | unsigned long m_owningThread; | |
194 | wxMutexType m_type; | |
195 | ||
196 | DECLARE_NO_COPY_CLASS(wxMutexInternal) | |
197 | }; | |
198 | ||
199 | // all mutexes are recursive under Win32 so we don't use mutexType | |
200 | wxMutexInternal::wxMutexInternal(wxMutexType mutexType) | |
201 | { | |
202 | // create a nameless (hence intra process and always private) mutex | |
203 | m_mutex = ::CreateMutex | |
204 | ( | |
205 | NULL, // default secutiry attributes | |
206 | FALSE, // not initially locked | |
207 | NULL // no name | |
208 | ); | |
209 | ||
210 | m_type = mutexType; | |
211 | m_owningThread = 0; | |
212 | ||
213 | if ( !m_mutex ) | |
214 | { | |
215 | wxLogLastError(_T("CreateMutex()")); | |
216 | } | |
217 | ||
218 | } | |
219 | ||
220 | wxMutexInternal::~wxMutexInternal() | |
221 | { | |
222 | if ( m_mutex ) | |
223 | { | |
224 | if ( !::CloseHandle(m_mutex) ) | |
225 | { | |
226 | wxLogLastError(_T("CloseHandle(mutex)")); | |
227 | } | |
228 | } | |
229 | } | |
230 | ||
231 | wxMutexError wxMutexInternal::TryLock() | |
232 | { | |
233 | const wxMutexError rc = LockTimeout(0); | |
234 | ||
235 | // we have a special return code for timeout in this case | |
236 | return rc == wxMUTEX_TIMEOUT ? wxMUTEX_BUSY : rc; | |
237 | } | |
238 | ||
239 | wxMutexError wxMutexInternal::LockTimeout(DWORD milliseconds) | |
240 | { | |
241 | if (m_type == wxMUTEX_DEFAULT) | |
242 | { | |
243 | // Don't allow recursive | |
244 | if (m_owningThread != 0) | |
245 | { | |
246 | if (m_owningThread == wxThread::GetCurrentId()) | |
247 | return wxMUTEX_DEAD_LOCK; | |
248 | } | |
249 | } | |
250 | ||
251 | DWORD rc = ::WaitForSingleObject(m_mutex, milliseconds); | |
252 | switch ( rc ) | |
253 | { | |
254 | case WAIT_ABANDONED: | |
255 | // the previous caller died without releasing the mutex, so even | |
256 | // though we did get it, log a message about this | |
257 | wxLogDebug(_T("WaitForSingleObject() returned WAIT_ABANDONED")); | |
258 | // fall through | |
259 | ||
260 | case WAIT_OBJECT_0: | |
261 | // ok | |
262 | break; | |
263 | ||
264 | case WAIT_TIMEOUT: | |
265 | return wxMUTEX_TIMEOUT; | |
266 | ||
267 | default: | |
268 | wxFAIL_MSG(wxT("impossible return value in wxMutex::Lock")); | |
269 | // fall through | |
270 | ||
271 | case WAIT_FAILED: | |
272 | wxLogLastError(_T("WaitForSingleObject(mutex)")); | |
273 | return wxMUTEX_MISC_ERROR; | |
274 | } | |
275 | ||
276 | if (m_type == wxMUTEX_DEFAULT) | |
277 | { | |
278 | // required for checking recursiveness | |
279 | m_owningThread = wxThread::GetCurrentId(); | |
280 | } | |
281 | ||
282 | return wxMUTEX_NO_ERROR; | |
283 | } | |
284 | ||
285 | wxMutexError wxMutexInternal::Unlock() | |
286 | { | |
287 | // required for checking recursiveness | |
288 | m_owningThread = 0; | |
289 | ||
290 | if ( !::ReleaseMutex(m_mutex) ) | |
291 | { | |
292 | wxLogLastError(_T("ReleaseMutex()")); | |
293 | ||
294 | return wxMUTEX_MISC_ERROR; | |
295 | } | |
296 | ||
297 | return wxMUTEX_NO_ERROR; | |
298 | } | |
299 | ||
300 | // -------------------------------------------------------------------------- | |
301 | // wxSemaphore | |
302 | // -------------------------------------------------------------------------- | |
303 | ||
304 | // a trivial wrapper around Win32 semaphore | |
305 | class wxSemaphoreInternal | |
306 | { | |
307 | public: | |
308 | wxSemaphoreInternal(int initialcount, int maxcount); | |
309 | ~wxSemaphoreInternal(); | |
310 | ||
311 | bool IsOk() const { return m_semaphore != NULL; } | |
312 | ||
313 | wxSemaError Wait() { return WaitTimeout(INFINITE); } | |
314 | ||
315 | wxSemaError TryWait() | |
316 | { | |
317 | wxSemaError rc = WaitTimeout(0); | |
318 | if ( rc == wxSEMA_TIMEOUT ) | |
319 | rc = wxSEMA_BUSY; | |
320 | ||
321 | return rc; | |
322 | } | |
323 | ||
324 | wxSemaError WaitTimeout(unsigned long milliseconds); | |
325 | ||
326 | wxSemaError Post(); | |
327 | ||
328 | private: | |
329 | HANDLE m_semaphore; | |
330 | ||
331 | DECLARE_NO_COPY_CLASS(wxSemaphoreInternal) | |
332 | }; | |
333 | ||
334 | wxSemaphoreInternal::wxSemaphoreInternal(int initialcount, int maxcount) | |
335 | { | |
336 | #if !defined(_WIN32_WCE) || (_WIN32_WCE >= 300) | |
337 | if ( maxcount == 0 ) | |
338 | { | |
339 | // make it practically infinite | |
340 | maxcount = INT_MAX; | |
341 | } | |
342 | ||
343 | m_semaphore = ::CreateSemaphore | |
344 | ( | |
345 | NULL, // default security attributes | |
346 | initialcount, | |
347 | maxcount, | |
348 | NULL // no name | |
349 | ); | |
350 | #endif | |
351 | if ( !m_semaphore ) | |
352 | { | |
353 | wxLogLastError(_T("CreateSemaphore()")); | |
354 | } | |
355 | } | |
356 | ||
357 | wxSemaphoreInternal::~wxSemaphoreInternal() | |
358 | { | |
359 | if ( m_semaphore ) | |
360 | { | |
361 | if ( !::CloseHandle(m_semaphore) ) | |
362 | { | |
363 | wxLogLastError(_T("CloseHandle(semaphore)")); | |
364 | } | |
365 | } | |
366 | } | |
367 | ||
368 | wxSemaError wxSemaphoreInternal::WaitTimeout(unsigned long milliseconds) | |
369 | { | |
370 | DWORD rc = ::WaitForSingleObject( m_semaphore, milliseconds ); | |
371 | ||
372 | switch ( rc ) | |
373 | { | |
374 | case WAIT_OBJECT_0: | |
375 | return wxSEMA_NO_ERROR; | |
376 | ||
377 | case WAIT_TIMEOUT: | |
378 | return wxSEMA_TIMEOUT; | |
379 | ||
380 | default: | |
381 | wxLogLastError(_T("WaitForSingleObject(semaphore)")); | |
382 | } | |
383 | ||
384 | return wxSEMA_MISC_ERROR; | |
385 | } | |
386 | ||
387 | wxSemaError wxSemaphoreInternal::Post() | |
388 | { | |
389 | #if !defined(_WIN32_WCE) || (_WIN32_WCE >= 300) | |
390 | if ( !::ReleaseSemaphore(m_semaphore, 1, NULL /* ptr to previous count */) ) | |
391 | { | |
392 | if ( GetLastError() == ERROR_TOO_MANY_POSTS ) | |
393 | { | |
394 | return wxSEMA_OVERFLOW; | |
395 | } | |
396 | else | |
397 | { | |
398 | wxLogLastError(_T("ReleaseSemaphore")); | |
399 | return wxSEMA_MISC_ERROR; | |
400 | } | |
401 | } | |
402 | ||
403 | return wxSEMA_NO_ERROR; | |
404 | #else | |
405 | return wxSEMA_MISC_ERROR; | |
406 | #endif | |
407 | } | |
408 | ||
409 | // ---------------------------------------------------------------------------- | |
410 | // wxThread implementation | |
411 | // ---------------------------------------------------------------------------- | |
412 | ||
413 | // wxThreadInternal class | |
414 | // ---------------------- | |
415 | ||
416 | class wxThreadInternal | |
417 | { | |
418 | public: | |
419 | wxThreadInternal(wxThread *thread) | |
420 | { | |
421 | m_thread = thread; | |
422 | m_hThread = 0; | |
423 | m_state = STATE_NEW; | |
424 | m_priority = WXTHREAD_DEFAULT_PRIORITY; | |
425 | m_nRef = 1; | |
426 | } | |
427 | ||
428 | ~wxThreadInternal() | |
429 | { | |
430 | Free(); | |
431 | } | |
432 | ||
433 | void Free() | |
434 | { | |
435 | if ( m_hThread ) | |
436 | { | |
437 | if ( !::CloseHandle(m_hThread) ) | |
438 | { | |
439 | wxLogLastError(wxT("CloseHandle(thread)")); | |
440 | } | |
441 | ||
442 | m_hThread = 0; | |
443 | } | |
444 | } | |
445 | ||
446 | // create a new (suspended) thread (for the given thread object) | |
447 | bool Create(wxThread *thread, unsigned int stackSize); | |
448 | ||
449 | // wait for the thread to terminate, either by itself, or by asking it | |
450 | // (politely, this is not Kill()!) to do it | |
451 | wxThreadError WaitForTerminate(wxCriticalSection& cs, | |
452 | wxThread::ExitCode *pRc, | |
453 | wxThread *threadToDelete = NULL); | |
454 | ||
455 | // kill the thread unconditionally | |
456 | wxThreadError Kill(); | |
457 | ||
458 | // suspend/resume/terminate | |
459 | bool Suspend(); | |
460 | bool Resume(); | |
461 | void Cancel() { m_state = STATE_CANCELED; } | |
462 | ||
463 | // thread state | |
464 | void SetState(wxThreadState state) { m_state = state; } | |
465 | wxThreadState GetState() const { return m_state; } | |
466 | ||
467 | // thread priority | |
468 | void SetPriority(unsigned int priority); | |
469 | unsigned int GetPriority() const { return m_priority; } | |
470 | ||
471 | // thread handle and id | |
472 | HANDLE GetHandle() const { return m_hThread; } | |
473 | DWORD GetId() const { return m_tid; } | |
474 | ||
475 | // the thread function forwarding to DoThreadStart | |
476 | static THREAD_RETVAL THREAD_CALLCONV WinThreadStart(void *thread); | |
477 | ||
478 | // really start the thread (if it's not already dead) | |
479 | static THREAD_RETVAL DoThreadStart(wxThread *thread); | |
480 | ||
481 | // call OnExit() on the thread | |
482 | static void DoThreadOnExit(wxThread *thread); | |
483 | ||
484 | ||
485 | void KeepAlive() | |
486 | { | |
487 | if ( m_thread->IsDetached() ) | |
488 | ::InterlockedIncrement(&m_nRef); | |
489 | } | |
490 | ||
491 | void LetDie() | |
492 | { | |
493 | if ( m_thread->IsDetached() && !::InterlockedDecrement(&m_nRef) ) | |
494 | delete m_thread; | |
495 | } | |
496 | ||
497 | private: | |
498 | // the thread we're associated with | |
499 | wxThread *m_thread; | |
500 | ||
501 | HANDLE m_hThread; // handle of the thread | |
502 | wxThreadState m_state; // state, see wxThreadState enum | |
503 | unsigned int m_priority; // thread priority in "wx" units | |
504 | DWORD m_tid; // thread id | |
505 | ||
506 | // number of threads which need this thread to remain alive, when the count | |
507 | // reaches 0 we kill the owning wxThread -- and die ourselves with it | |
508 | LONG m_nRef; | |
509 | ||
510 | DECLARE_NO_COPY_CLASS(wxThreadInternal) | |
511 | }; | |
512 | ||
513 | // small class which keeps a thread alive during its lifetime | |
514 | class wxThreadKeepAlive | |
515 | { | |
516 | public: | |
517 | wxThreadKeepAlive(wxThreadInternal& thrImpl) : m_thrImpl(thrImpl) | |
518 | { m_thrImpl.KeepAlive(); } | |
519 | ~wxThreadKeepAlive() | |
520 | { m_thrImpl.LetDie(); } | |
521 | ||
522 | private: | |
523 | wxThreadInternal& m_thrImpl; | |
524 | }; | |
525 | ||
526 | /* static */ | |
527 | void wxThreadInternal::DoThreadOnExit(wxThread *thread) | |
528 | { | |
529 | wxTRY | |
530 | { | |
531 | thread->OnExit(); | |
532 | } | |
533 | wxCATCH_ALL( wxTheApp->OnUnhandledException(); ) | |
534 | } | |
535 | ||
536 | /* static */ | |
537 | THREAD_RETVAL wxThreadInternal::DoThreadStart(wxThread *thread) | |
538 | { | |
539 | wxON_BLOCK_EXIT1(DoThreadOnExit, thread); | |
540 | ||
541 | THREAD_RETVAL rc = THREAD_ERROR_EXIT; | |
542 | ||
543 | wxTRY | |
544 | { | |
545 | // store the thread object in the TLS | |
546 | if ( !::TlsSetValue(gs_tlsThisThread, thread) ) | |
547 | { | |
548 | wxLogSysError(_("Can not start thread: error writing TLS.")); | |
549 | ||
550 | return THREAD_ERROR_EXIT; | |
551 | } | |
552 | ||
553 | rc = wxPtrToUInt(thread->Entry()); | |
554 | } | |
555 | wxCATCH_ALL( wxTheApp->OnUnhandledException(); ) | |
556 | ||
557 | return rc; | |
558 | } | |
559 | ||
560 | /* static */ | |
561 | THREAD_RETVAL THREAD_CALLCONV wxThreadInternal::WinThreadStart(void *param) | |
562 | { | |
563 | THREAD_RETVAL rc = THREAD_ERROR_EXIT; | |
564 | ||
565 | wxThread * const thread = (wxThread *)param; | |
566 | ||
567 | // each thread has its own SEH translator so install our own a.s.a.p. | |
568 | DisableAutomaticSETranslator(); | |
569 | ||
570 | // first of all, check whether we hadn't been cancelled already and don't | |
571 | // start the user code at all then | |
572 | const bool hasExited = thread->m_internal->GetState() == STATE_EXITED; | |
573 | ||
574 | // run the thread function itself inside a SEH try/except block | |
575 | wxSEH_TRY | |
576 | { | |
577 | if ( hasExited ) | |
578 | DoThreadOnExit(thread); | |
579 | else | |
580 | rc = DoThreadStart(thread); | |
581 | } | |
582 | wxSEH_HANDLE(THREAD_ERROR_EXIT) | |
583 | ||
584 | ||
585 | // save IsDetached because thread object can be deleted by joinable | |
586 | // threads after state is changed to STATE_EXITED. | |
587 | const bool isDetached = thread->IsDetached(); | |
588 | if ( !hasExited ) | |
589 | { | |
590 | // enter m_critsect before changing the thread state | |
591 | // | |
592 | // NB: can't use wxCriticalSectionLocker here as we use SEH and it's | |
593 | // incompatible with C++ object dtors | |
594 | thread->m_critsect.Enter(); | |
595 | thread->m_internal->SetState(STATE_EXITED); | |
596 | thread->m_critsect.Leave(); | |
597 | } | |
598 | ||
599 | // the thread may delete itself now if it wants, we don't need it any more | |
600 | if ( isDetached ) | |
601 | thread->m_internal->LetDie(); | |
602 | ||
603 | return rc; | |
604 | } | |
605 | ||
606 | void wxThreadInternal::SetPriority(unsigned int priority) | |
607 | { | |
608 | m_priority = priority; | |
609 | ||
610 | // translate wxWidgets priority to the Windows one | |
611 | int win_priority; | |
612 | if (m_priority <= 20) | |
613 | win_priority = THREAD_PRIORITY_LOWEST; | |
614 | else if (m_priority <= 40) | |
615 | win_priority = THREAD_PRIORITY_BELOW_NORMAL; | |
616 | else if (m_priority <= 60) | |
617 | win_priority = THREAD_PRIORITY_NORMAL; | |
618 | else if (m_priority <= 80) | |
619 | win_priority = THREAD_PRIORITY_ABOVE_NORMAL; | |
620 | else if (m_priority <= 100) | |
621 | win_priority = THREAD_PRIORITY_HIGHEST; | |
622 | else | |
623 | { | |
624 | wxFAIL_MSG(wxT("invalid value of thread priority parameter")); | |
625 | win_priority = THREAD_PRIORITY_NORMAL; | |
626 | } | |
627 | ||
628 | if ( !::SetThreadPriority(m_hThread, win_priority) ) | |
629 | { | |
630 | wxLogSysError(_("Can't set thread priority")); | |
631 | } | |
632 | } | |
633 | ||
634 | bool wxThreadInternal::Create(wxThread *thread, unsigned int stackSize) | |
635 | { | |
636 | wxASSERT_MSG( m_state == STATE_NEW && !m_hThread, | |
637 | _T("Create()ing thread twice?") ); | |
638 | ||
639 | // for compilers which have it, we should use C RTL function for thread | |
640 | // creation instead of Win32 API one because otherwise we will have memory | |
641 | // leaks if the thread uses C RTL (and most threads do) | |
642 | #ifdef wxUSE_BEGIN_THREAD | |
643 | ||
644 | // Watcom is reported to not like 0 stack size (which means "use default" | |
645 | // for the other compilers and is also the default value for stackSize) | |
646 | #ifdef __WATCOMC__ | |
647 | if ( !stackSize ) | |
648 | stackSize = 10240; | |
649 | #endif // __WATCOMC__ | |
650 | ||
651 | m_hThread = (HANDLE)_beginthreadex | |
652 | ( | |
653 | NULL, // default security | |
654 | stackSize, | |
655 | wxThreadInternal::WinThreadStart, // entry point | |
656 | thread, | |
657 | CREATE_SUSPENDED, | |
658 | (unsigned int *)&m_tid | |
659 | ); | |
660 | #else // compiler doesn't have _beginthreadex | |
661 | m_hThread = ::CreateThread | |
662 | ( | |
663 | NULL, // default security | |
664 | stackSize, // stack size | |
665 | wxThreadInternal::WinThreadStart, // thread entry point | |
666 | (LPVOID)thread, // parameter | |
667 | CREATE_SUSPENDED, // flags | |
668 | &m_tid // [out] thread id | |
669 | ); | |
670 | #endif // _beginthreadex/CreateThread | |
671 | ||
672 | if ( m_hThread == NULL ) | |
673 | { | |
674 | wxLogSysError(_("Can't create thread")); | |
675 | ||
676 | return false; | |
677 | } | |
678 | ||
679 | if ( m_priority != WXTHREAD_DEFAULT_PRIORITY ) | |
680 | { | |
681 | SetPriority(m_priority); | |
682 | } | |
683 | ||
684 | return true; | |
685 | } | |
686 | ||
687 | wxThreadError wxThreadInternal::Kill() | |
688 | { | |
689 | if ( !::TerminateThread(m_hThread, THREAD_ERROR_EXIT) ) | |
690 | { | |
691 | wxLogSysError(_("Couldn't terminate thread")); | |
692 | ||
693 | return wxTHREAD_MISC_ERROR; | |
694 | } | |
695 | ||
696 | Free(); | |
697 | ||
698 | return wxTHREAD_NO_ERROR; | |
699 | } | |
700 | ||
701 | wxThreadError | |
702 | wxThreadInternal::WaitForTerminate(wxCriticalSection& cs, | |
703 | wxThread::ExitCode *pRc, | |
704 | wxThread *threadToDelete) | |
705 | { | |
706 | // prevent the thread C++ object from disappearing as long as we are using | |
707 | // it here | |
708 | wxThreadKeepAlive keepAlive(*this); | |
709 | ||
710 | ||
711 | // we may either wait passively for the thread to terminate (when called | |
712 | // from Wait()) or ask it to terminate (when called from Delete()) | |
713 | bool shouldDelete = threadToDelete != NULL; | |
714 | ||
715 | DWORD rc = 0; | |
716 | ||
717 | // we might need to resume the thread if it's currently stopped | |
718 | bool shouldResume = false; | |
719 | ||
720 | // as Delete() (which calls us) is always safe to call we need to consider | |
721 | // all possible states | |
722 | { | |
723 | wxCriticalSectionLocker lock(cs); | |
724 | ||
725 | if ( m_state == STATE_NEW ) | |
726 | { | |
727 | if ( shouldDelete ) | |
728 | { | |
729 | // WinThreadStart() will see it and terminate immediately, no | |
730 | // need to cancel the thread -- but we still need to resume it | |
731 | // to let it run | |
732 | m_state = STATE_EXITED; | |
733 | ||
734 | // we must call Resume() as the thread hasn't been initially | |
735 | // resumed yet (and as Resume() it knows about STATE_EXITED | |
736 | // special case, it won't touch it and WinThreadStart() will | |
737 | // just exit immediately) | |
738 | shouldResume = true; | |
739 | shouldDelete = false; | |
740 | } | |
741 | //else: shouldResume is correctly set to false here, wait until | |
742 | // someone else runs the thread and it finishes | |
743 | } | |
744 | else // running, paused, cancelled or even exited | |
745 | { | |
746 | shouldResume = m_state == STATE_PAUSED; | |
747 | } | |
748 | } | |
749 | ||
750 | // resume the thread if it is paused | |
751 | if ( shouldResume ) | |
752 | Resume(); | |
753 | ||
754 | // ask the thread to terminate | |
755 | if ( shouldDelete ) | |
756 | { | |
757 | wxCriticalSectionLocker lock(cs); | |
758 | ||
759 | Cancel(); | |
760 | } | |
761 | ||
762 | ||
763 | // now wait for thread to finish | |
764 | if ( wxThread::IsMain() ) | |
765 | { | |
766 | // set flag for wxIsWaitingForThread() | |
767 | gs_waitingForThread = true; | |
768 | } | |
769 | ||
770 | // we can't just wait for the thread to terminate because it might be | |
771 | // calling some GUI functions and so it will never terminate before we | |
772 | // process the Windows messages that result from these functions | |
773 | // (note that even in console applications we might have to process | |
774 | // messages if we use wxExecute() or timers or ...) | |
775 | DWORD result wxDUMMY_INITIALIZE(0); | |
776 | do | |
777 | { | |
778 | if ( wxThread::IsMain() ) | |
779 | { | |
780 | // give the thread we're waiting for chance to do the GUI call | |
781 | // it might be in | |
782 | if ( (gs_nWaitingForGui > 0) && wxGuiOwnedByMainThread() ) | |
783 | { | |
784 | wxMutexGuiLeave(); | |
785 | } | |
786 | } | |
787 | ||
788 | wxAppTraits *traits = wxTheApp ? wxTheApp->GetTraits() : NULL; | |
789 | if ( traits ) | |
790 | { | |
791 | result = traits->WaitForThread(m_hThread); | |
792 | } | |
793 | else // can't wait for the thread | |
794 | { | |
795 | // so kill it below | |
796 | result = 0xFFFFFFFF; | |
797 | } | |
798 | ||
799 | switch ( result ) | |
800 | { | |
801 | case 0xFFFFFFFF: | |
802 | // error | |
803 | wxLogSysError(_("Can not wait for thread termination")); | |
804 | Kill(); | |
805 | return wxTHREAD_KILLED; | |
806 | ||
807 | case WAIT_OBJECT_0: | |
808 | // thread we're waiting for terminated | |
809 | break; | |
810 | ||
811 | case WAIT_OBJECT_0 + 1: | |
812 | // new message arrived, process it -- but only if we're the | |
813 | // main thread as we don't support processing messages in | |
814 | // the other ones | |
815 | // | |
816 | // NB: we still must include QS_ALLINPUT even when waiting | |
817 | // in a secondary thread because if it had created some | |
818 | // window somehow (possible not even using wxWidgets) | |
819 | // the system might dead lock then | |
820 | if ( wxThread::IsMain() ) | |
821 | { | |
822 | if ( traits && !traits->DoMessageFromThreadWait() ) | |
823 | { | |
824 | // WM_QUIT received: kill the thread | |
825 | Kill(); | |
826 | ||
827 | return wxTHREAD_KILLED; | |
828 | } | |
829 | } | |
830 | break; | |
831 | ||
832 | default: | |
833 | wxFAIL_MSG(wxT("unexpected result of MsgWaitForMultipleObject")); | |
834 | } | |
835 | } while ( result != WAIT_OBJECT_0 ); | |
836 | ||
837 | if ( wxThread::IsMain() ) | |
838 | { | |
839 | gs_waitingForThread = false; | |
840 | } | |
841 | ||
842 | ||
843 | // although the thread might be already in the EXITED state it might not | |
844 | // have terminated yet and so we are not sure that it has actually | |
845 | // terminated if the "if" above hadn't been taken | |
846 | for ( ;; ) | |
847 | { | |
848 | if ( !::GetExitCodeThread(m_hThread, &rc) ) | |
849 | { | |
850 | wxLogLastError(wxT("GetExitCodeThread")); | |
851 | ||
852 | rc = THREAD_ERROR_EXIT; | |
853 | ||
854 | break; | |
855 | } | |
856 | ||
857 | if ( rc != STILL_ACTIVE ) | |
858 | break; | |
859 | ||
860 | // give the other thread some time to terminate, otherwise we may be | |
861 | // starving it | |
862 | ::Sleep(1); | |
863 | } | |
864 | ||
865 | if ( pRc ) | |
866 | *pRc = wxUIntToPtr(rc); | |
867 | ||
868 | // we don't need the thread handle any more in any case | |
869 | Free(); | |
870 | ||
871 | ||
872 | return rc == THREAD_ERROR_EXIT ? wxTHREAD_MISC_ERROR : wxTHREAD_NO_ERROR; | |
873 | } | |
874 | ||
875 | bool wxThreadInternal::Suspend() | |
876 | { | |
877 | DWORD nSuspendCount = ::SuspendThread(m_hThread); | |
878 | if ( nSuspendCount == (DWORD)-1 ) | |
879 | { | |
880 | wxLogSysError(_("Can not suspend thread %x"), m_hThread); | |
881 | ||
882 | return false; | |
883 | } | |
884 | ||
885 | m_state = STATE_PAUSED; | |
886 | ||
887 | return true; | |
888 | } | |
889 | ||
890 | bool wxThreadInternal::Resume() | |
891 | { | |
892 | DWORD nSuspendCount = ::ResumeThread(m_hThread); | |
893 | if ( nSuspendCount == (DWORD)-1 ) | |
894 | { | |
895 | wxLogSysError(_("Can not resume thread %x"), m_hThread); | |
896 | ||
897 | return false; | |
898 | } | |
899 | ||
900 | // don't change the state from STATE_EXITED because it's special and means | |
901 | // we are going to terminate without running any user code - if we did it, | |
902 | // the code in WaitForTerminate() wouldn't work | |
903 | if ( m_state != STATE_EXITED ) | |
904 | { | |
905 | m_state = STATE_RUNNING; | |
906 | } | |
907 | ||
908 | return true; | |
909 | } | |
910 | ||
911 | // static functions | |
912 | // ---------------- | |
913 | ||
914 | wxThread *wxThread::This() | |
915 | { | |
916 | wxThread *thread = (wxThread *)::TlsGetValue(gs_tlsThisThread); | |
917 | ||
918 | // be careful, 0 may be a valid return value as well | |
919 | if ( !thread && (::GetLastError() != NO_ERROR) ) | |
920 | { | |
921 | wxLogSysError(_("Couldn't get the current thread pointer")); | |
922 | ||
923 | // return NULL... | |
924 | } | |
925 | ||
926 | return thread; | |
927 | } | |
928 | ||
929 | bool wxThread::IsMain() | |
930 | { | |
931 | return ::GetCurrentThreadId() == gs_idMainThread || gs_idMainThread == 0; | |
932 | } | |
933 | ||
934 | void wxThread::Yield() | |
935 | { | |
936 | // 0 argument to Sleep() is special and means to just give away the rest of | |
937 | // our timeslice | |
938 | ::Sleep(0); | |
939 | } | |
940 | ||
941 | int wxThread::GetCPUCount() | |
942 | { | |
943 | SYSTEM_INFO si; | |
944 | GetSystemInfo(&si); | |
945 | ||
946 | return si.dwNumberOfProcessors; | |
947 | } | |
948 | ||
949 | unsigned long wxThread::GetCurrentId() | |
950 | { | |
951 | return (unsigned long)::GetCurrentThreadId(); | |
952 | } | |
953 | ||
954 | bool wxThread::SetConcurrency(size_t WXUNUSED_IN_WINCE(level)) | |
955 | { | |
956 | #ifdef __WXWINCE__ | |
957 | return false; | |
958 | #else | |
959 | wxASSERT_MSG( IsMain(), _T("should only be called from the main thread") ); | |
960 | ||
961 | // ok only for the default one | |
962 | if ( level == 0 ) | |
963 | return 0; | |
964 | ||
965 | // get system affinity mask first | |
966 | HANDLE hProcess = ::GetCurrentProcess(); | |
967 | DWORD_PTR dwProcMask, dwSysMask; | |
968 | if ( ::GetProcessAffinityMask(hProcess, &dwProcMask, &dwSysMask) == 0 ) | |
969 | { | |
970 | wxLogLastError(_T("GetProcessAffinityMask")); | |
971 | ||
972 | return false; | |
973 | } | |
974 | ||
975 | // how many CPUs have we got? | |
976 | if ( dwSysMask == 1 ) | |
977 | { | |
978 | // don't bother with all this complicated stuff - on a single | |
979 | // processor system it doesn't make much sense anyhow | |
980 | return level == 1; | |
981 | } | |
982 | ||
983 | // calculate the process mask: it's a bit vector with one bit per | |
984 | // processor; we want to schedule the process to run on first level | |
985 | // CPUs | |
986 | DWORD bit = 1; | |
987 | while ( bit ) | |
988 | { | |
989 | if ( dwSysMask & bit ) | |
990 | { | |
991 | // ok, we can set this bit | |
992 | dwProcMask |= bit; | |
993 | ||
994 | // another process added | |
995 | if ( --level == 0 ) | |
996 | { | |
997 | // and that's enough | |
998 | break; | |
999 | } | |
1000 | } | |
1001 | ||
1002 | // next bit | |
1003 | bit <<= 1; | |
1004 | } | |
1005 | ||
1006 | // could we set all bits? | |
1007 | if ( level != 0 ) | |
1008 | { | |
1009 | wxLogDebug(_T("bad level %u in wxThread::SetConcurrency()"), level); | |
1010 | ||
1011 | return false; | |
1012 | } | |
1013 | ||
1014 | // set it: we can't link to SetProcessAffinityMask() because it doesn't | |
1015 | // exist in Win9x, use RT binding instead | |
1016 | ||
1017 | typedef BOOL (WINAPI *SETPROCESSAFFINITYMASK)(HANDLE, DWORD_PTR); | |
1018 | ||
1019 | // can use static var because we're always in the main thread here | |
1020 | static SETPROCESSAFFINITYMASK pfnSetProcessAffinityMask = NULL; | |
1021 | ||
1022 | if ( !pfnSetProcessAffinityMask ) | |
1023 | { | |
1024 | HMODULE hModKernel = ::LoadLibrary(_T("kernel32")); | |
1025 | if ( hModKernel ) | |
1026 | { | |
1027 | pfnSetProcessAffinityMask = (SETPROCESSAFFINITYMASK) | |
1028 | ::GetProcAddress(hModKernel, "SetProcessAffinityMask"); | |
1029 | } | |
1030 | ||
1031 | // we've discovered a MT version of Win9x! | |
1032 | wxASSERT_MSG( pfnSetProcessAffinityMask, | |
1033 | _T("this system has several CPUs but no SetProcessAffinityMask function?") ); | |
1034 | } | |
1035 | ||
1036 | if ( !pfnSetProcessAffinityMask ) | |
1037 | { | |
1038 | // msg given above - do it only once | |
1039 | return false; | |
1040 | } | |
1041 | ||
1042 | if ( pfnSetProcessAffinityMask(hProcess, dwProcMask) == 0 ) | |
1043 | { | |
1044 | wxLogLastError(_T("SetProcessAffinityMask")); | |
1045 | ||
1046 | return false; | |
1047 | } | |
1048 | ||
1049 | return true; | |
1050 | #endif // __WXWINCE__/!__WXWINCE__ | |
1051 | } | |
1052 | ||
1053 | // ctor and dtor | |
1054 | // ------------- | |
1055 | ||
1056 | wxThread::wxThread(wxThreadKind kind) | |
1057 | { | |
1058 | m_internal = new wxThreadInternal(this); | |
1059 | ||
1060 | m_isDetached = kind == wxTHREAD_DETACHED; | |
1061 | } | |
1062 | ||
1063 | wxThread::~wxThread() | |
1064 | { | |
1065 | delete m_internal; | |
1066 | } | |
1067 | ||
1068 | // create/start thread | |
1069 | // ------------------- | |
1070 | ||
1071 | wxThreadError wxThread::Create(unsigned int stackSize) | |
1072 | { | |
1073 | wxCriticalSectionLocker lock(m_critsect); | |
1074 | ||
1075 | if ( !m_internal->Create(this, stackSize) ) | |
1076 | return wxTHREAD_NO_RESOURCE; | |
1077 | ||
1078 | return wxTHREAD_NO_ERROR; | |
1079 | } | |
1080 | ||
1081 | wxThreadError wxThread::Run() | |
1082 | { | |
1083 | wxCriticalSectionLocker lock(m_critsect); | |
1084 | ||
1085 | if ( m_internal->GetState() != STATE_NEW ) | |
1086 | { | |
1087 | // actually, it may be almost any state at all, not only STATE_RUNNING | |
1088 | return wxTHREAD_RUNNING; | |
1089 | } | |
1090 | ||
1091 | // the thread has just been created and is still suspended - let it run | |
1092 | return Resume(); | |
1093 | } | |
1094 | ||
1095 | // suspend/resume thread | |
1096 | // --------------------- | |
1097 | ||
1098 | wxThreadError wxThread::Pause() | |
1099 | { | |
1100 | wxCriticalSectionLocker lock(m_critsect); | |
1101 | ||
1102 | return m_internal->Suspend() ? wxTHREAD_NO_ERROR : wxTHREAD_MISC_ERROR; | |
1103 | } | |
1104 | ||
1105 | wxThreadError wxThread::Resume() | |
1106 | { | |
1107 | wxCriticalSectionLocker lock(m_critsect); | |
1108 | ||
1109 | return m_internal->Resume() ? wxTHREAD_NO_ERROR : wxTHREAD_MISC_ERROR; | |
1110 | } | |
1111 | ||
1112 | // stopping thread | |
1113 | // --------------- | |
1114 | ||
1115 | wxThread::ExitCode wxThread::Wait() | |
1116 | { | |
1117 | ExitCode rc = wxUIntToPtr(THREAD_ERROR_EXIT); | |
1118 | ||
1119 | // although under Windows we can wait for any thread, it's an error to | |
1120 | // wait for a detached one in wxWin API | |
1121 | wxCHECK_MSG( !IsDetached(), rc, | |
1122 | _T("wxThread::Wait(): can't wait for detached thread") ); | |
1123 | ||
1124 | (void)m_internal->WaitForTerminate(m_critsect, &rc); | |
1125 | ||
1126 | return rc; | |
1127 | } | |
1128 | ||
1129 | wxThreadError wxThread::Delete(ExitCode *pRc) | |
1130 | { | |
1131 | return m_internal->WaitForTerminate(m_critsect, pRc, this); | |
1132 | } | |
1133 | ||
1134 | wxThreadError wxThread::Kill() | |
1135 | { | |
1136 | if ( !IsRunning() ) | |
1137 | return wxTHREAD_NOT_RUNNING; | |
1138 | ||
1139 | wxThreadError rc = m_internal->Kill(); | |
1140 | ||
1141 | if ( IsDetached() ) | |
1142 | { | |
1143 | delete this; | |
1144 | } | |
1145 | else // joinable | |
1146 | { | |
1147 | // update the status of the joinable thread | |
1148 | wxCriticalSectionLocker lock(m_critsect); | |
1149 | m_internal->SetState(STATE_EXITED); | |
1150 | } | |
1151 | ||
1152 | return rc; | |
1153 | } | |
1154 | ||
1155 | void wxThread::Exit(ExitCode status) | |
1156 | { | |
1157 | m_internal->Free(); | |
1158 | ||
1159 | if ( IsDetached() ) | |
1160 | { | |
1161 | delete this; | |
1162 | } | |
1163 | else // joinable | |
1164 | { | |
1165 | // update the status of the joinable thread | |
1166 | wxCriticalSectionLocker lock(m_critsect); | |
1167 | m_internal->SetState(STATE_EXITED); | |
1168 | } | |
1169 | ||
1170 | #ifdef wxUSE_BEGIN_THREAD | |
1171 | _endthreadex(wxPtrToUInt(status)); | |
1172 | #else // !VC++ | |
1173 | ::ExitThread((DWORD)status); | |
1174 | #endif // VC++/!VC++ | |
1175 | ||
1176 | wxFAIL_MSG(wxT("Couldn't return from ExitThread()!")); | |
1177 | } | |
1178 | ||
1179 | // priority setting | |
1180 | // ---------------- | |
1181 | ||
1182 | void wxThread::SetPriority(unsigned int prio) | |
1183 | { | |
1184 | wxCriticalSectionLocker lock(m_critsect); | |
1185 | ||
1186 | m_internal->SetPriority(prio); | |
1187 | } | |
1188 | ||
1189 | unsigned int wxThread::GetPriority() const | |
1190 | { | |
1191 | wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect); // const_cast | |
1192 | ||
1193 | return m_internal->GetPriority(); | |
1194 | } | |
1195 | ||
1196 | unsigned long wxThread::GetId() const | |
1197 | { | |
1198 | wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect); // const_cast | |
1199 | ||
1200 | return (unsigned long)m_internal->GetId(); | |
1201 | } | |
1202 | ||
1203 | bool wxThread::IsRunning() const | |
1204 | { | |
1205 | wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect); // const_cast | |
1206 | ||
1207 | return m_internal->GetState() == STATE_RUNNING; | |
1208 | } | |
1209 | ||
1210 | bool wxThread::IsAlive() const | |
1211 | { | |
1212 | wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect); // const_cast | |
1213 | ||
1214 | return (m_internal->GetState() == STATE_RUNNING) || | |
1215 | (m_internal->GetState() == STATE_PAUSED); | |
1216 | } | |
1217 | ||
1218 | bool wxThread::IsPaused() const | |
1219 | { | |
1220 | wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect); // const_cast | |
1221 | ||
1222 | return m_internal->GetState() == STATE_PAUSED; | |
1223 | } | |
1224 | ||
1225 | bool wxThread::TestDestroy() | |
1226 | { | |
1227 | wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect); // const_cast | |
1228 | ||
1229 | return m_internal->GetState() == STATE_CANCELED; | |
1230 | } | |
1231 | ||
1232 | // ---------------------------------------------------------------------------- | |
1233 | // Automatic initialization for thread module | |
1234 | // ---------------------------------------------------------------------------- | |
1235 | ||
1236 | class wxThreadModule : public wxModule | |
1237 | { | |
1238 | public: | |
1239 | virtual bool OnInit(); | |
1240 | virtual void OnExit(); | |
1241 | ||
1242 | private: | |
1243 | DECLARE_DYNAMIC_CLASS(wxThreadModule) | |
1244 | }; | |
1245 | ||
1246 | IMPLEMENT_DYNAMIC_CLASS(wxThreadModule, wxModule) | |
1247 | ||
1248 | bool wxThreadModule::OnInit() | |
1249 | { | |
1250 | // allocate TLS index for storing the pointer to the current thread | |
1251 | gs_tlsThisThread = ::TlsAlloc(); | |
1252 | if ( gs_tlsThisThread == 0xFFFFFFFF ) | |
1253 | { | |
1254 | // in normal circumstances it will only happen if all other | |
1255 | // TLS_MINIMUM_AVAILABLE (>= 64) indices are already taken - in other | |
1256 | // words, this should never happen | |
1257 | wxLogSysError(_("Thread module initialization failed: impossible to allocate index in thread local storage")); | |
1258 | ||
1259 | return false; | |
1260 | } | |
1261 | ||
1262 | // main thread doesn't have associated wxThread object, so store 0 in the | |
1263 | // TLS instead | |
1264 | if ( !::TlsSetValue(gs_tlsThisThread, (LPVOID)0) ) | |
1265 | { | |
1266 | ::TlsFree(gs_tlsThisThread); | |
1267 | gs_tlsThisThread = 0xFFFFFFFF; | |
1268 | ||
1269 | wxLogSysError(_("Thread module initialization failed: can not store value in thread local storage")); | |
1270 | ||
1271 | return false; | |
1272 | } | |
1273 | ||
1274 | gs_critsectWaitingForGui = new wxCriticalSection(); | |
1275 | ||
1276 | gs_critsectGui = new wxCriticalSection(); | |
1277 | gs_critsectGui->Enter(); | |
1278 | ||
1279 | gs_critsectThreadDelete = new wxCriticalSection; | |
1280 | ||
1281 | // no error return for GetCurrentThreadId() | |
1282 | gs_idMainThread = ::GetCurrentThreadId(); | |
1283 | ||
1284 | return true; | |
1285 | } | |
1286 | ||
1287 | void wxThreadModule::OnExit() | |
1288 | { | |
1289 | if ( !::TlsFree(gs_tlsThisThread) ) | |
1290 | { | |
1291 | wxLogLastError(wxT("TlsFree failed.")); | |
1292 | } | |
1293 | ||
1294 | delete gs_critsectThreadDelete; | |
1295 | gs_critsectThreadDelete = NULL; | |
1296 | ||
1297 | if ( gs_critsectGui ) | |
1298 | { | |
1299 | gs_critsectGui->Leave(); | |
1300 | delete gs_critsectGui; | |
1301 | gs_critsectGui = NULL; | |
1302 | } | |
1303 | ||
1304 | delete gs_critsectWaitingForGui; | |
1305 | gs_critsectWaitingForGui = NULL; | |
1306 | } | |
1307 | ||
1308 | // ---------------------------------------------------------------------------- | |
1309 | // under Windows, these functions are implemented using a critical section and | |
1310 | // not a mutex, so the names are a bit confusing | |
1311 | // ---------------------------------------------------------------------------- | |
1312 | ||
1313 | void wxMutexGuiEnterImpl() | |
1314 | { | |
1315 | // this would dead lock everything... | |
1316 | wxASSERT_MSG( !wxThread::IsMain(), | |
1317 | wxT("main thread doesn't want to block in wxMutexGuiEnter()!") ); | |
1318 | ||
1319 | // the order in which we enter the critical sections here is crucial!! | |
1320 | ||
1321 | // set the flag telling to the main thread that we want to do some GUI | |
1322 | { | |
1323 | wxCriticalSectionLocker enter(*gs_critsectWaitingForGui); | |
1324 | ||
1325 | gs_nWaitingForGui++; | |
1326 | } | |
1327 | ||
1328 | wxWakeUpMainThread(); | |
1329 | ||
1330 | // now we may block here because the main thread will soon let us in | |
1331 | // (during the next iteration of OnIdle()) | |
1332 | gs_critsectGui->Enter(); | |
1333 | } | |
1334 | ||
1335 | void wxMutexGuiLeaveImpl() | |
1336 | { | |
1337 | wxCriticalSectionLocker enter(*gs_critsectWaitingForGui); | |
1338 | ||
1339 | if ( wxThread::IsMain() ) | |
1340 | { | |
1341 | gs_bGuiOwnedByMainThread = false; | |
1342 | } | |
1343 | else | |
1344 | { | |
1345 | // decrement the number of threads waiting for GUI access now | |
1346 | wxASSERT_MSG( gs_nWaitingForGui > 0, | |
1347 | wxT("calling wxMutexGuiLeave() without entering it first?") ); | |
1348 | ||
1349 | gs_nWaitingForGui--; | |
1350 | ||
1351 | wxWakeUpMainThread(); | |
1352 | } | |
1353 | ||
1354 | gs_critsectGui->Leave(); | |
1355 | } | |
1356 | ||
1357 | void WXDLLIMPEXP_BASE wxMutexGuiLeaveOrEnter() | |
1358 | { | |
1359 | wxASSERT_MSG( wxThread::IsMain(), | |
1360 | wxT("only main thread may call wxMutexGuiLeaveOrEnter()!") ); | |
1361 | ||
1362 | wxCriticalSectionLocker enter(*gs_critsectWaitingForGui); | |
1363 | ||
1364 | if ( gs_nWaitingForGui == 0 ) | |
1365 | { | |
1366 | // no threads are waiting for GUI - so we may acquire the lock without | |
1367 | // any danger (but only if we don't already have it) | |
1368 | if ( !wxGuiOwnedByMainThread() ) | |
1369 | { | |
1370 | gs_critsectGui->Enter(); | |
1371 | ||
1372 | gs_bGuiOwnedByMainThread = true; | |
1373 | } | |
1374 | //else: already have it, nothing to do | |
1375 | } | |
1376 | else | |
1377 | { | |
1378 | // some threads are waiting, release the GUI lock if we have it | |
1379 | if ( wxGuiOwnedByMainThread() ) | |
1380 | { | |
1381 | wxMutexGuiLeave(); | |
1382 | } | |
1383 | //else: some other worker thread is doing GUI | |
1384 | } | |
1385 | } | |
1386 | ||
1387 | bool WXDLLIMPEXP_BASE wxGuiOwnedByMainThread() | |
1388 | { | |
1389 | return gs_bGuiOwnedByMainThread; | |
1390 | } | |
1391 | ||
1392 | // wake up the main thread if it's in ::GetMessage() | |
1393 | void WXDLLIMPEXP_BASE wxWakeUpMainThread() | |
1394 | { | |
1395 | // sending any message would do - hopefully WM_NULL is harmless enough | |
1396 | if ( !::PostThreadMessage(gs_idMainThread, WM_NULL, 0, 0) ) | |
1397 | { | |
1398 | // should never happen | |
1399 | wxLogLastError(wxT("PostThreadMessage(WM_NULL)")); | |
1400 | } | |
1401 | } | |
1402 | ||
1403 | bool WXDLLIMPEXP_BASE wxIsWaitingForThread() | |
1404 | { | |
1405 | return gs_waitingForThread; | |
1406 | } | |
1407 | ||
1408 | // ---------------------------------------------------------------------------- | |
1409 | // include common implementation code | |
1410 | // ---------------------------------------------------------------------------- | |
1411 | ||
1412 | #include "wx/thrimpl.cpp" | |
1413 | ||
1414 | #endif // wxUSE_THREADS |