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1 /////////////////////////////////////////////////////////////////////////////
2 // Name: wx/thread.h
3 // Purpose: Thread API
4 // Author: Guilhem Lavaux
5 // Modified by: Vadim Zeitlin (modifications partly inspired by omnithreads
6 // package from Olivetti & Oracle Research Laboratory)
7 // Created: 04/13/98
8 // RCS-ID: $Id$
9 // Copyright: (c) Guilhem Lavaux
10 // Licence: wxWindows licence
11 /////////////////////////////////////////////////////////////////////////////
12
13 #ifndef _WX_THREAD_H_
14 #define _WX_THREAD_H_
15
16 // ----------------------------------------------------------------------------
17 // headers
18 // ----------------------------------------------------------------------------
19
20 // get the value of wxUSE_THREADS configuration flag
21 #include "wx/defs.h"
22
23 #if wxUSE_THREADS
24
25 // only for wxUSE_THREADS - otherwise we'd get undefined symbols
26 #if defined(__GNUG__) && !defined(__APPLE__)
27 #pragma interface "thread.h"
28 #endif
29
30 // Windows headers define it
31 #ifdef Yield
32 #undef Yield
33 #endif
34
35 #include "wx/module.h"
36
37 // ----------------------------------------------------------------------------
38 // constants
39 // ----------------------------------------------------------------------------
40
41 enum wxMutexError
42 {
43 wxMUTEX_NO_ERROR = 0, // operation completed successfully
44 wxMUTEX_INVALID, // mutex hasn't been initialized
45 wxMUTEX_DEAD_LOCK, // mutex is already locked by the calling thread
46 wxMUTEX_BUSY, // mutex is already locked by another thread
47 wxMUTEX_UNLOCKED, // attempt to unlock a mutex which is not locked
48 wxMUTEX_MISC_ERROR // any other error
49 };
50
51 enum wxCondError
52 {
53 wxCOND_NO_ERROR = 0,
54 wxCOND_INVALID,
55 wxCOND_TIMEOUT, // WaitTimeout() has timed out
56 wxCOND_MISC_ERROR
57 };
58
59 enum wxSemaError
60 {
61 wxSEMA_NO_ERROR = 0,
62 wxSEMA_INVALID, // semaphore hasn't been initialized successfully
63 wxSEMA_BUSY, // returned by TryWait() if Wait() would block
64 wxSEMA_TIMEOUT, // returned by WaitTimeout()
65 wxSEMA_OVERFLOW, // Post() would increase counter past the max
66 wxSEMA_MISC_ERROR
67 };
68
69 enum wxThreadError
70 {
71 wxTHREAD_NO_ERROR = 0, // No error
72 wxTHREAD_NO_RESOURCE, // No resource left to create a new thread
73 wxTHREAD_RUNNING, // The thread is already running
74 wxTHREAD_NOT_RUNNING, // The thread isn't running
75 wxTHREAD_KILLED, // Thread we waited for had to be killed
76 wxTHREAD_MISC_ERROR // Some other error
77 };
78
79 enum wxThreadKind
80 {
81 wxTHREAD_DETACHED,
82 wxTHREAD_JOINABLE
83 };
84
85 // defines the interval of priority
86 enum
87 {
88 WXTHREAD_MIN_PRIORITY = 0u,
89 WXTHREAD_DEFAULT_PRIORITY = 50u,
90 WXTHREAD_MAX_PRIORITY = 100u
91 };
92
93 // There are 2 types of mutexes: normal mutexes and recursive ones. The attempt
94 // to lock a normal mutex by a thread which already owns it results in
95 // undefined behaviour (it always works under Windows, it will almost always
96 // result in a deadlock under Unix). Locking a recursive mutex in such
97 // situation always succeeds and it must be unlocked as many times as it has
98 // been locked.
99 //
100 // However recursive mutexes have several important drawbacks: first, in the
101 // POSIX implementation, they're less efficient. Second, and more importantly,
102 // they CAN NOT BE USED WITH CONDITION VARIABLES under Unix! Using them with
103 // wxCondition will work under Windows and some Unices (notably Linux) but will
104 // deadlock under other Unix versions (e.g. Solaris). As it might be difficult
105 // to ensure that a recursive mutex is not used with wxCondition, it is a good
106 // idea to avoid using recursive mutexes at all. Also, the last problem with
107 // them is that some (older) Unix versions don't support this at all -- which
108 // results in a configure warning when building and a deadlock when using them.
109 enum wxMutexType
110 {
111 // normal mutex: try to always use this one
112 wxMUTEX_DEFAULT,
113
114 // recursive mutex: don't use these ones with wxCondition
115 wxMUTEX_RECURSIVE
116 };
117
118 // forward declarations
119 class WXDLLEXPORT wxConditionInternal;
120 class WXDLLEXPORT wxMutexInternal;
121 class WXDLLEXPORT wxSemaphoreInternal;
122 class WXDLLEXPORT wxThreadInternal;
123
124 // ----------------------------------------------------------------------------
125 // A mutex object is a synchronization object whose state is set to signaled
126 // when it is not owned by any thread, and nonsignaled when it is owned. Its
127 // name comes from its usefulness in coordinating mutually-exclusive access to
128 // a shared resource. Only one thread at a time can own a mutex object.
129 // ----------------------------------------------------------------------------
130
131 // you should consider wxMutexLocker whenever possible instead of directly
132 // working with wxMutex class - it is safer
133 class WXDLLEXPORT wxMutex
134 {
135 public:
136 // constructor & destructor
137 // ------------------------
138
139 // create either default (always safe) or recursive mutex
140 wxMutex(wxMutexType mutexType = wxMUTEX_DEFAULT);
141
142 // destroys the mutex kernel object
143 ~wxMutex();
144
145 // test if the mutex has been created successfully
146 bool IsOk() const;
147
148 // mutex operations
149 // ----------------
150
151 // Lock the mutex, blocking on it until it is unlocked by the other thread.
152 // The result of locking a mutex already locked by the current thread
153 // depend on the mutex type.
154 //
155 // The caller must call Unlock() later if Lock() returned wxMUTEX_NO_ERROR.
156 wxMutexError Lock();
157
158 // Try to lock the mutex: if it is currently locked, return immediately
159 // with an error. Otherwise the caller must call Unlock().
160 wxMutexError TryLock();
161
162 // Unlock the mutex. It is an error to unlock an already unlocked mutex
163 wxMutexError Unlock();
164
165 protected:
166 wxMutexInternal *m_internal;
167
168 friend class wxConditionInternal;
169
170 DECLARE_NO_COPY_CLASS(wxMutex)
171 };
172
173 // a helper class which locks the mutex in the ctor and unlocks it in the dtor:
174 // this ensures that mutex is always unlocked, even if the function returns or
175 // throws an exception before it reaches the end
176 class WXDLLEXPORT wxMutexLocker
177 {
178 public:
179 // lock the mutex in the ctor
180 wxMutexLocker(wxMutex& mutex)
181 : m_isOk(FALSE), m_mutex(mutex)
182 { m_isOk = ( m_mutex.Lock() == wxMUTEX_NO_ERROR ); }
183
184 // returns TRUE if mutex was successfully locked in ctor
185 bool IsOk() const
186 { return m_isOk; }
187
188 // unlock the mutex in dtor
189 ~wxMutexLocker()
190 { if ( IsOk() ) m_mutex.Unlock(); }
191
192 private:
193 // no assignment operator nor copy ctor
194 wxMutexLocker(const wxMutexLocker&);
195 wxMutexLocker& operator=(const wxMutexLocker&);
196
197 bool m_isOk;
198 wxMutex& m_mutex;
199 };
200
201 // ----------------------------------------------------------------------------
202 // Critical section: this is the same as mutex but is only visible to the
203 // threads of the same process. For the platforms which don't have native
204 // support for critical sections, they're implemented entirely in terms of
205 // mutexes.
206 //
207 // NB: wxCriticalSection object does not allocate any memory in its ctor
208 // which makes it possible to have static globals of this class
209 // ----------------------------------------------------------------------------
210
211 // in order to avoid any overhead under platforms where critical sections are
212 // just mutexes make all wxCriticalSection class functions inline
213 #if !defined(__WXMSW__) && !defined(__WXPM__)
214 #define wxCRITSECT_IS_MUTEX 1
215
216 #define wxCRITSECT_INLINE inline
217 #else // MSW || OS2
218 #define wxCRITSECT_IS_MUTEX 0
219
220 #define wxCRITSECT_INLINE
221 #endif // MSW/!MSW
222
223 // you should consider wxCriticalSectionLocker whenever possible instead of
224 // directly working with wxCriticalSection class - it is safer
225 class WXDLLEXPORT wxCriticalSection
226 {
227 public:
228 // ctor & dtor
229 wxCRITSECT_INLINE wxCriticalSection();
230 wxCRITSECT_INLINE ~wxCriticalSection();
231
232 // enter the section (the same as locking a mutex)
233 wxCRITSECT_INLINE void Enter();
234
235 // leave the critical section (same as unlocking a mutex)
236 wxCRITSECT_INLINE void Leave();
237
238 private:
239 #if wxCRITSECT_IS_MUTEX
240 wxMutex m_mutex;
241 #elif defined(__WXMSW__)
242 // we can't allocate any memory in the ctor, so use placement new -
243 // unfortunately, we have to hardcode the sizeof() here because we can't
244 // include windows.h from this public header and we also have to use the
245 // union to force the correct (i.e. maximal) alignment
246 //
247 // if CRITICAL_SECTION size changes in Windows, you'll get an assert from
248 // thread.cpp and will need to increase the buffer size
249 //
250 // finally, we need this typedef instead of declaring m_buffer directly
251 // because otherwise the assert mentioned above wouldn't compile with some
252 // compilers (notably CodeWarrior 8)
253 typedef char wxCritSectBuffer[24];
254 union
255 {
256 unsigned long m_dummy1;
257 void *m_dummy2;
258
259 wxCritSectBuffer m_buffer;
260 };
261 #else
262 // nothing for OS/2
263 #endif // Unix/Win32/OS2
264
265 DECLARE_NO_COPY_CLASS(wxCriticalSection)
266 };
267
268 #if wxCRITSECT_IS_MUTEX
269 // implement wxCriticalSection using mutexes
270 inline wxCriticalSection::wxCriticalSection() { }
271 inline wxCriticalSection::~wxCriticalSection() { }
272
273 inline void wxCriticalSection::Enter() { (void)m_mutex.Lock(); }
274 inline void wxCriticalSection::Leave() { (void)m_mutex.Unlock(); }
275 #endif // wxCRITSECT_IS_MUTEX
276
277 #undef wxCRITSECT_INLINE
278 #undef wxCRITSECT_IS_MUTEX
279
280 // wxCriticalSectionLocker is the same to critical sections as wxMutexLocker is
281 // to th mutexes
282 class WXDLLEXPORT wxCriticalSectionLocker
283 {
284 public:
285 wxCriticalSectionLocker(wxCriticalSection& cs)
286 : m_critsect(cs)
287 {
288 m_critsect.Enter();
289 }
290
291 ~wxCriticalSectionLocker()
292 {
293 m_critsect.Leave();
294 }
295
296 private:
297 wxCriticalSection& m_critsect;
298
299 DECLARE_NO_COPY_CLASS(wxCriticalSectionLocker)
300 };
301
302 // ----------------------------------------------------------------------------
303 // wxCondition models a POSIX condition variable which allows one (or more)
304 // thread(s) to wait until some condition is fulfilled
305 // ----------------------------------------------------------------------------
306
307 class WXDLLEXPORT wxCondition
308 {
309 public:
310 // Each wxCondition object is associated with a (single) wxMutex object.
311 // The mutex object MUST be locked before calling Wait()
312 wxCondition(wxMutex& mutex);
313
314 // dtor is not virtual, don't use this class polymorphically
315 ~wxCondition();
316
317 // return TRUE if the condition has been created successfully
318 bool IsOk() const;
319
320 // NB: the associated mutex MUST be locked beforehand by the calling thread
321 //
322 // it atomically releases the lock on the associated mutex
323 // and starts waiting to be woken up by a Signal()/Broadcast()
324 // once its signaled, then it will wait until it can reacquire
325 // the lock on the associated mutex object, before returning.
326 wxCondError Wait();
327
328 // exactly as Wait() except that it may also return if the specified
329 // timeout ellapses even if the condition hasn't been signalled: in this
330 // case, the return value is FALSE, otherwise (i.e. in case of a normal
331 // return) it is TRUE
332 //
333 // the timeeout parameter specifies a interval that needs to be waited in
334 // milliseconds
335 wxCondError WaitTimeout(unsigned long milliseconds);
336
337 // NB: the associated mutex may or may not be locked by the calling thread
338 //
339 // this method unblocks one thread if any are blocking on the condition.
340 // if no thread is blocking in Wait(), then the signal is NOT remembered
341 // The thread which was blocking on Wait(), will then reacquire the lock
342 // on the associated mutex object before returning
343 wxCondError Signal();
344
345 // NB: the associated mutex may or may not be locked by the calling thread
346 //
347 // this method unblocks all threads if any are blocking on the condition.
348 // if no thread is blocking in Wait(), then the signal is NOT remembered
349 // The threads which were blocking on Wait(), will then reacquire the lock
350 // on the associated mutex object before returning.
351 wxCondError Broadcast();
352
353
354 // deprecated version, don't use
355 bool Wait(unsigned long milliseconds)
356 { return WaitTimeout(milliseconds) == wxCOND_NO_ERROR; }
357
358 private:
359 wxConditionInternal *m_internal;
360
361 DECLARE_NO_COPY_CLASS(wxCondition)
362 };
363
364 // ----------------------------------------------------------------------------
365 // wxSemaphore: a counter limiting the number of threads concurrently accessing
366 // a shared resource
367 // ----------------------------------------------------------------------------
368
369 class WXDLLEXPORT wxSemaphore
370 {
371 public:
372 // specifying a maxcount of 0 actually makes wxSemaphore behave as if there
373 // is no upper limit, if maxcount is 1 the semaphore behaves as a mutex
374 wxSemaphore( int initialcount = 0, int maxcount = 0 );
375
376 // dtor is not virtual, don't use this class polymorphically
377 ~wxSemaphore();
378
379 // return TRUE if the semaphore has been created successfully
380 bool IsOk() const;
381
382 // wait indefinitely, until the semaphore count goes beyond 0
383 // and then decrement it and return (this method might have been called
384 // Acquire())
385 wxSemaError Wait();
386
387 // same as Wait(), but does not block, returns wxSEMA_NO_ERROR if
388 // successful and wxSEMA_BUSY if the count is currently zero
389 wxSemaError TryWait();
390
391 // same as Wait(), but as a timeout limit, returns wxSEMA_NO_ERROR if the
392 // semaphore was acquired and wxSEMA_TIMEOUT if the timeout has ellapsed
393 wxSemaError WaitTimeout(unsigned long milliseconds);
394
395 // increments the semaphore count and signals one of the waiting threads
396 wxSemaError Post();
397
398 private:
399 wxSemaphoreInternal *m_internal;
400
401 DECLARE_NO_COPY_CLASS(wxSemaphore)
402 };
403
404 // ----------------------------------------------------------------------------
405 // wxThread: class encpasulating a thread of execution
406 // ----------------------------------------------------------------------------
407
408 // there are two different kinds of threads: joinable and detached (default)
409 // ones. Only joinable threads can return a return code and only detached
410 // threads auto-delete themselves - the user should delete the joinable
411 // threads manually.
412
413 // NB: in the function descriptions the words "this thread" mean the thread
414 // created by the wxThread object while "main thread" is the thread created
415 // during the process initialization (a.k.a. the GUI thread)
416
417 // On VMS thread pointers are 64 bits (also needed for other systems???
418 #ifdef __VMS
419 typedef unsigned long long wxThreadIdType;
420 #else
421 typedef unsigned long wxThreadIdType;
422 #endif
423
424 class WXDLLEXPORT wxThread
425 {
426 public:
427 // the return type for the thread function
428 typedef void *ExitCode;
429
430 // static functions
431 // Returns the wxThread object for the calling thread. NULL is returned
432 // if the caller is the main thread (but it's recommended to use
433 // IsMain() and only call This() for threads other than the main one
434 // because NULL is also returned on error). If the thread wasn't
435 // created with wxThread class, the returned value is undefined.
436 static wxThread *This();
437
438 // Returns true if current thread is the main thread.
439 static bool IsMain();
440
441 // Release the rest of our time slice leting the other threads run
442 static void Yield();
443
444 // Sleep during the specified period of time in milliseconds
445 //
446 // NB: at least under MSW worker threads can not call ::wxSleep()!
447 static void Sleep(unsigned long milliseconds);
448
449 // get the number of system CPUs - useful with SetConcurrency()
450 // (the "best" value for it is usually number of CPUs + 1)
451 //
452 // Returns -1 if unknown, number of CPUs otherwise
453 static int GetCPUCount();
454
455 // Get the platform specific thread ID and return as a long. This
456 // can be used to uniquely identify threads, even if they are not
457 // wxThreads. This is used by wxPython.
458 static wxThreadIdType GetCurrentId();
459
460 // sets the concurrency level: this is, roughly, the number of threads
461 // the system tries to schedule to run in parallel. 0 means the
462 // default value (usually acceptable, but may not yield the best
463 // performance for this process)
464 //
465 // Returns TRUE on success, FALSE otherwise (if not implemented, for
466 // example)
467 static bool SetConcurrency(size_t level);
468
469 // constructor only creates the C++ thread object and doesn't create (or
470 // start) the real thread
471 wxThread(wxThreadKind kind = wxTHREAD_DETACHED);
472
473 // functions that change the thread state: all these can only be called
474 // from _another_ thread (typically the thread that created this one, e.g.
475 // the main thread), not from the thread itself
476
477 // create a new thread and optionally set the stack size on
478 // platforms that support that - call Run() to start it
479 // (special cased for watcom which won't accept 0 default)
480
481 wxThreadError Create(unsigned int stackSize = 0);
482
483 // starts execution of the thread - from the moment Run() is called
484 // the execution of wxThread::Entry() may start at any moment, caller
485 // shouldn't suppose that it starts after (or before) Run() returns.
486 wxThreadError Run();
487
488 // stops the thread if it's running and deletes the wxThread object if
489 // this is a detached thread freeing its memory - otherwise (for
490 // joinable threads) you still need to delete wxThread object
491 // yourself.
492 //
493 // this function only works if the thread calls TestDestroy()
494 // periodically - the thread will only be deleted the next time it
495 // does it!
496 //
497 // will fill the rc pointer with the thread exit code if it's !NULL
498 wxThreadError Delete(ExitCode *rc = (ExitCode *)NULL);
499
500 // waits for a joinable thread to finish and returns its exit code
501 //
502 // Returns (ExitCode)-1 on error (for example, if the thread is not
503 // joinable)
504 ExitCode Wait();
505
506 // kills the thread without giving it any chance to clean up - should
507 // not be used in normal circumstances, use Delete() instead. It is a
508 // dangerous function that should only be used in the most extreme
509 // cases!
510 //
511 // The wxThread object is deleted by Kill() if the thread is
512 // detachable, but you still have to delete it manually for joinable
513 // threads.
514 wxThreadError Kill();
515
516 // pause a running thread: as Delete(), this only works if the thread
517 // calls TestDestroy() regularly
518 wxThreadError Pause();
519
520 // resume a paused thread
521 wxThreadError Resume();
522
523 // priority
524 // Sets the priority to "prio": see WXTHREAD_XXX_PRIORITY constants
525 //
526 // NB: the priority can only be set before the thread is created
527 void SetPriority(unsigned int prio);
528
529 // Get the current priority.
530 unsigned int GetPriority() const;
531
532 // thread status inquiries
533 // Returns true if the thread is alive: i.e. running or suspended
534 bool IsAlive() const;
535 // Returns true if the thread is running (not paused, not killed).
536 bool IsRunning() const;
537 // Returns true if the thread is suspended
538 bool IsPaused() const;
539
540 // is the thread of detached kind?
541 bool IsDetached() const { return m_isDetached; }
542
543 // Get the thread ID - a platform dependent number which uniquely
544 // identifies a thread inside a process
545 wxThreadIdType GetId() const;
546
547 // called when the thread exits - in the context of this thread
548 //
549 // NB: this function will not be called if the thread is Kill()ed
550 virtual void OnExit() { }
551
552 // dtor is public, but the detached threads should never be deleted - use
553 // Delete() instead (or leave the thread terminate by itself)
554 virtual ~wxThread();
555
556 protected:
557 // Returns TRUE if the thread was asked to terminate: this function should
558 // be called by the thread from time to time, otherwise the main thread
559 // will be left forever in Delete()!
560 bool TestDestroy();
561
562 // exits from the current thread - can be called only from this thread
563 void Exit(ExitCode exitcode = 0);
564
565 // entry point for the thread - called by Run() and executes in the context
566 // of this thread.
567 virtual void *Entry() = 0;
568
569 private:
570 // no copy ctor/assignment operator
571 wxThread(const wxThread&);
572 wxThread& operator=(const wxThread&);
573
574 friend class wxThreadInternal;
575
576 // the (platform-dependent) thread class implementation
577 wxThreadInternal *m_internal;
578
579 // protects access to any methods of wxThreadInternal object
580 wxCriticalSection m_critsect;
581
582 // true if the thread is detached, false if it is joinable
583 bool m_isDetached;
584 };
585
586 // ----------------------------------------------------------------------------
587 // Automatic initialization
588 // ----------------------------------------------------------------------------
589
590 // GUI mutex handling.
591 void WXDLLEXPORT wxMutexGuiEnter();
592 void WXDLLEXPORT wxMutexGuiLeave();
593
594 // macros for entering/leaving critical sections which may be used without
595 // having to take them inside "#if wxUSE_THREADS"
596 #define wxENTER_CRIT_SECT(cs) (cs).Enter()
597 #define wxLEAVE_CRIT_SECT(cs) (cs).Leave()
598 #define wxCRIT_SECT_DECLARE(cs) static wxCriticalSection cs
599 #define wxCRIT_SECT_LOCKER(name, cs) wxCriticalSectionLocker name(cs)
600
601 #else // !wxUSE_THREADS
602
603 // no thread support
604 inline void WXDLLEXPORT wxMutexGuiEnter() { }
605 inline void WXDLLEXPORT wxMutexGuiLeave() { }
606
607 // macros for entering/leaving critical sections which may be used without
608 // having to take them inside "#if wxUSE_THREADS"
609 #define wxENTER_CRIT_SECT(cs)
610 #define wxLEAVE_CRIT_SECT(cs)
611 #define wxCRIT_SECT_DECLARE(cs)
612 #define wxCRIT_SECT_LOCKER(name, cs)
613
614 #endif // wxUSE_THREADS/!wxUSE_THREADS
615
616 // mark part of code as being a critical section: this macro declares a
617 // critical section with the given name and enters it immediately and leaves
618 // it at the end of the current scope
619 //
620 // example:
621 //
622 // int Count()
623 // {
624 // static int s_counter = 0;
625 //
626 // wxCRITICAL_SECTION(counter);
627 //
628 // return ++s_counter;
629 // }
630 //
631 // this function is MT-safe in presence of the threads but there is no
632 // overhead when the library is compiled without threads
633 #define wxCRITICAL_SECTION(name) \
634 wxCRIT_SECT_DECLARE(s_cs##name); \
635 wxCRIT_SECT_LOCKER(cs##name##Locker, s_cs##name)
636
637 // automatically lock GUI mutex in ctor and unlock it in dtor
638 class WXDLLEXPORT wxMutexGuiLocker
639 {
640 public:
641 wxMutexGuiLocker() { wxMutexGuiEnter(); }
642 ~wxMutexGuiLocker() { wxMutexGuiLeave(); }
643 };
644
645 // -----------------------------------------------------------------------------
646 // implementation only until the end of file
647 // -----------------------------------------------------------------------------
648
649 #if wxUSE_THREADS
650
651 #if defined(__WXMSW__) || defined(__WXMAC__) || defined(__WXPM__)
652 // unlock GUI if there are threads waiting for and lock it back when
653 // there are no more of them - should be called periodically by the main
654 // thread
655 extern void WXDLLEXPORT wxMutexGuiLeaveOrEnter();
656
657 // returns TRUE if the main thread has GUI lock
658 extern bool WXDLLEXPORT wxGuiOwnedByMainThread();
659
660 #ifndef __WXPM__
661 // wakes up the main thread if it's sleeping inside ::GetMessage()
662 extern void WXDLLEXPORT wxWakeUpMainThread();
663 #endif // !OS/2
664
665 // return TRUE if the main thread is waiting for some other to terminate:
666 // wxApp then should block all "dangerous" messages
667 extern bool WXDLLEXPORT wxIsWaitingForThread();
668 #endif // MSW, Mac, OS/2
669
670 #endif // wxUSE_THREADS
671
672 #endif // _WX_THREAD_H_
673