1 /////////////////////////////////////////////////////////////////////////////
4 // Author: Guilhem Lavaux
5 // Modified by: Vadim Zeitlin (modifications partly inspired by omnithreads
6 // package from Olivetti & Oracle Research Laboratory)
9 // Copyright: (c) Guilhem Lavaux
10 // Licence: wxWindows licence
11 /////////////////////////////////////////////////////////////////////////////
16 // ----------------------------------------------------------------------------
18 // ----------------------------------------------------------------------------
20 // get the value of wxUSE_THREADS configuration flag
25 // ----------------------------------------------------------------------------
27 // ----------------------------------------------------------------------------
31 wxMUTEX_NO_ERROR
= 0, // operation completed successfully
32 wxMUTEX_INVALID
, // mutex hasn't been initialized
33 wxMUTEX_DEAD_LOCK
, // mutex is already locked by the calling thread
34 wxMUTEX_BUSY
, // mutex is already locked by another thread
35 wxMUTEX_UNLOCKED
, // attempt to unlock a mutex which is not locked
36 wxMUTEX_TIMEOUT
, // LockTimeout() has timed out
37 wxMUTEX_MISC_ERROR
// any other error
44 wxCOND_TIMEOUT
, // WaitTimeout() has timed out
51 wxSEMA_INVALID
, // semaphore hasn't been initialized successfully
52 wxSEMA_BUSY
, // returned by TryWait() if Wait() would block
53 wxSEMA_TIMEOUT
, // returned by WaitTimeout()
54 wxSEMA_OVERFLOW
, // Post() would increase counter past the max
60 wxTHREAD_NO_ERROR
= 0, // No error
61 wxTHREAD_NO_RESOURCE
, // No resource left to create a new thread
62 wxTHREAD_RUNNING
, // The thread is already running
63 wxTHREAD_NOT_RUNNING
, // The thread isn't running
64 wxTHREAD_KILLED
, // Thread we waited for had to be killed
65 wxTHREAD_MISC_ERROR
// Some other error
74 // defines the interval of priority
77 WXTHREAD_MIN_PRIORITY
= 0u,
78 WXTHREAD_DEFAULT_PRIORITY
= 50u,
79 WXTHREAD_MAX_PRIORITY
= 100u
82 // There are 2 types of mutexes: normal mutexes and recursive ones. The attempt
83 // to lock a normal mutex by a thread which already owns it results in
84 // undefined behaviour (it always works under Windows, it will almost always
85 // result in a deadlock under Unix). Locking a recursive mutex in such
86 // situation always succeeds and it must be unlocked as many times as it has
89 // However recursive mutexes have several important drawbacks: first, in the
90 // POSIX implementation, they're less efficient. Second, and more importantly,
91 // they CAN NOT BE USED WITH CONDITION VARIABLES under Unix! Using them with
92 // wxCondition will work under Windows and some Unices (notably Linux) but will
93 // deadlock under other Unix versions (e.g. Solaris). As it might be difficult
94 // to ensure that a recursive mutex is not used with wxCondition, it is a good
95 // idea to avoid using recursive mutexes at all. Also, the last problem with
96 // them is that some (older) Unix versions don't support this at all -- which
97 // results in a configure warning when building and a deadlock when using them.
100 // normal mutex: try to always use this one
103 // recursive mutex: don't use these ones with wxCondition
107 // forward declarations
108 class WXDLLIMPEXP_FWD_BASE wxThreadHelper
;
109 class WXDLLIMPEXP_FWD_BASE wxConditionInternal
;
110 class WXDLLIMPEXP_FWD_BASE wxMutexInternal
;
111 class WXDLLIMPEXP_FWD_BASE wxSemaphoreInternal
;
112 class WXDLLIMPEXP_FWD_BASE wxThreadInternal
;
114 // ----------------------------------------------------------------------------
115 // A mutex object is a synchronization object whose state is set to signaled
116 // when it is not owned by any thread, and nonsignaled when it is owned. Its
117 // name comes from its usefulness in coordinating mutually-exclusive access to
118 // a shared resource. Only one thread at a time can own a mutex object.
119 // ----------------------------------------------------------------------------
121 // you should consider wxMutexLocker whenever possible instead of directly
122 // working with wxMutex class - it is safer
123 class WXDLLIMPEXP_BASE wxMutex
126 // constructor & destructor
127 // ------------------------
129 // create either default (always safe) or recursive mutex
130 wxMutex(wxMutexType mutexType
= wxMUTEX_DEFAULT
);
132 // destroys the mutex kernel object
135 // test if the mutex has been created successfully
141 // Lock the mutex, blocking on it until it is unlocked by the other thread.
142 // The result of locking a mutex already locked by the current thread
143 // depend on the mutex type.
145 // The caller must call Unlock() later if Lock() returned wxMUTEX_NO_ERROR.
148 // Same as Lock() but return wxMUTEX_TIMEOUT if the mutex can't be locked
149 // during the given number of milliseconds
150 wxMutexError
LockTimeout(unsigned long ms
);
152 // Try to lock the mutex: if it is currently locked, return immediately
153 // with an error. Otherwise the caller must call Unlock().
154 wxMutexError
TryLock();
156 // Unlock the mutex. It is an error to unlock an already unlocked mutex
157 wxMutexError
Unlock();
160 wxMutexInternal
*m_internal
;
162 friend class wxConditionInternal
;
164 DECLARE_NO_COPY_CLASS(wxMutex
)
167 // a helper class which locks the mutex in the ctor and unlocks it in the dtor:
168 // this ensures that mutex is always unlocked, even if the function returns or
169 // throws an exception before it reaches the end
170 class WXDLLIMPEXP_BASE wxMutexLocker
173 // lock the mutex in the ctor
174 wxMutexLocker(wxMutex
& mutex
)
175 : m_isOk(false), m_mutex(mutex
)
176 { m_isOk
= ( m_mutex
.Lock() == wxMUTEX_NO_ERROR
); }
178 // returns true if mutex was successfully locked in ctor
182 // unlock the mutex in dtor
184 { if ( IsOk() ) m_mutex
.Unlock(); }
187 // no assignment operator nor copy ctor
188 wxMutexLocker(const wxMutexLocker
&);
189 wxMutexLocker
& operator=(const wxMutexLocker
&);
195 // ----------------------------------------------------------------------------
196 // Critical section: this is the same as mutex but is only visible to the
197 // threads of the same process. For the platforms which don't have native
198 // support for critical sections, they're implemented entirely in terms of
201 // NB: wxCriticalSection object does not allocate any memory in its ctor
202 // which makes it possible to have static globals of this class
203 // ----------------------------------------------------------------------------
205 // in order to avoid any overhead under platforms where critical sections are
206 // just mutexes make all wxCriticalSection class functions inline
207 #if !defined(__WXMSW__)
208 #define wxCRITSECT_IS_MUTEX 1
211 #define wxCRITSECT_INLINE
213 #define wxCRITSECT_INLINE inline
216 #define wxCRITSECT_IS_MUTEX 0
218 #define wxCRITSECT_INLINE
221 // you should consider wxCriticalSectionLocker whenever possible instead of
222 // directly working with wxCriticalSection class - it is safer
223 class WXDLLIMPEXP_BASE wxCriticalSection
227 wxCRITSECT_INLINE
wxCriticalSection();
228 wxCRITSECT_INLINE
~wxCriticalSection();
229 // enter the section (the same as locking a mutex)
230 wxCRITSECT_INLINE
void Enter();
232 // leave the critical section (same as unlocking a mutex)
233 wxCRITSECT_INLINE
void Leave();
236 #if wxCRITSECT_IS_MUTEX
238 #elif defined(__WXMSW__)
239 // we can't allocate any memory in the ctor, so use placement new -
240 // unfortunately, we have to hardcode the sizeof() here because we can't
241 // include windows.h from this public header and we also have to use the
242 // union to force the correct (i.e. maximal) alignment
244 // if CRITICAL_SECTION size changes in Windows, you'll get an assert from
245 // thread.cpp and will need to increase the buffer size
247 // finally, we need this typedef instead of declaring m_buffer directly
248 // because otherwise the assert mentioned above wouldn't compile with some
249 // compilers (notably CodeWarrior 8)
251 typedef char wxCritSectBuffer
[40];
253 typedef char wxCritSectBuffer
[24];
257 unsigned long m_dummy1
;
260 wxCritSectBuffer m_buffer
;
262 #endif // Unix&OS2/Win32
264 DECLARE_NO_COPY_CLASS(wxCriticalSection
)
267 #if wxCRITSECT_IS_MUTEX && !defined(__WXMAC__)
268 // implement wxCriticalSection using mutexes
269 inline wxCriticalSection
::wxCriticalSection() { }
270 inline wxCriticalSection
::~wxCriticalSection() { }
272 inline void wxCriticalSection
::Enter() { (void)m_mutex
.Lock(); }
273 inline void wxCriticalSection
::Leave() { (void)m_mutex
.Unlock(); }
274 #endif // wxCRITSECT_IS_MUTEX
276 #undef wxCRITSECT_INLINE
277 #undef wxCRITSECT_IS_MUTEX
279 // wxCriticalSectionLocker is the same to critical sections as wxMutexLocker is
281 class WXDLLIMPEXP_BASE wxCriticalSectionLocker
284 wxCriticalSectionLocker(wxCriticalSection
& cs
)
290 ~wxCriticalSectionLocker()
296 wxCriticalSection
& m_critsect
;
298 DECLARE_NO_COPY_CLASS(wxCriticalSectionLocker
)
301 // ----------------------------------------------------------------------------
302 // wxCondition models a POSIX condition variable which allows one (or more)
303 // thread(s) to wait until some condition is fulfilled
304 // ----------------------------------------------------------------------------
306 class WXDLLIMPEXP_BASE wxCondition
309 // Each wxCondition object is associated with a (single) wxMutex object.
310 // The mutex object MUST be locked before calling Wait()
311 wxCondition(wxMutex
& mutex
);
313 // dtor is not virtual, don't use this class polymorphically
316 // return true if the condition has been created successfully
319 // NB: the associated mutex MUST be locked beforehand by the calling thread
321 // it atomically releases the lock on the associated mutex
322 // and starts waiting to be woken up by a Signal()/Broadcast()
323 // once its signaled, then it will wait until it can reacquire
324 // the lock on the associated mutex object, before returning.
327 // exactly as Wait() except that it may also return if the specified
328 // timeout elapses even if the condition hasn't been signalled: in this
329 // case, the return value is false, otherwise (i.e. in case of a normal
330 // return) it is true
332 // the timeout parameter specifies an interval that needs to be waited for
334 wxCondError
WaitTimeout(unsigned long milliseconds
);
336 // NB: the associated mutex may or may not be locked by the calling thread
338 // this method unblocks one thread if any are blocking on the condition.
339 // if no thread is blocking in Wait(), then the signal is NOT remembered
340 // The thread which was blocking on Wait() will then reacquire the lock
341 // on the associated mutex object before returning
342 wxCondError
Signal();
344 // NB: the associated mutex may or may not be locked by the calling thread
346 // this method unblocks all threads if any are blocking on the condition.
347 // if no thread is blocking in Wait(), then the signal is NOT remembered
348 // The threads which were blocking on Wait() will then reacquire the lock
349 // on the associated mutex object before returning.
350 wxCondError
Broadcast();
353 #if WXWIN_COMPATIBILITY_2_6
354 // deprecated version, don't use
355 wxDEPRECATED( bool Wait(unsigned long milliseconds
) );
356 #endif // WXWIN_COMPATIBILITY_2_6
359 wxConditionInternal
*m_internal
;
361 DECLARE_NO_COPY_CLASS(wxCondition
)
364 #if WXWIN_COMPATIBILITY_2_6
365 inline bool wxCondition
::Wait(unsigned long milliseconds
)
366 { return WaitTimeout(milliseconds
) == wxCOND_NO_ERROR
; }
367 #endif // WXWIN_COMPATIBILITY_2_6
369 // ----------------------------------------------------------------------------
370 // wxSemaphore: a counter limiting the number of threads concurrently accessing
372 // ----------------------------------------------------------------------------
374 class WXDLLIMPEXP_BASE wxSemaphore
377 // specifying a maxcount of 0 actually makes wxSemaphore behave as if there
378 // is no upper limit, if maxcount is 1 the semaphore behaves as a mutex
379 wxSemaphore( int initialcount
= 0, int maxcount
= 0 );
381 // dtor is not virtual, don't use this class polymorphically
384 // return true if the semaphore has been created successfully
387 // wait indefinitely, until the semaphore count goes beyond 0
388 // and then decrement it and return (this method might have been called
392 // same as Wait(), but does not block, returns wxSEMA_NO_ERROR if
393 // successful and wxSEMA_BUSY if the count is currently zero
394 wxSemaError
TryWait();
396 // same as Wait(), but as a timeout limit, returns wxSEMA_NO_ERROR if the
397 // semaphore was acquired and wxSEMA_TIMEOUT if the timeout has elapsed
398 wxSemaError
WaitTimeout(unsigned long milliseconds
);
400 // increments the semaphore count and signals one of the waiting threads
404 wxSemaphoreInternal
*m_internal
;
406 DECLARE_NO_COPY_CLASS(wxSemaphore
)
409 // ----------------------------------------------------------------------------
410 // wxThread: class encapsulating a thread of execution
411 // ----------------------------------------------------------------------------
413 // there are two different kinds of threads: joinable and detached (default)
414 // ones. Only joinable threads can return a return code and only detached
415 // threads auto-delete themselves - the user should delete the joinable
418 // NB: in the function descriptions the words "this thread" mean the thread
419 // created by the wxThread object while "main thread" is the thread created
420 // during the process initialization (a.k.a. the GUI thread)
422 // On VMS thread pointers are 64 bits (also needed for other systems???
424 typedef unsigned long long wxThreadIdType
;
426 typedef unsigned long wxThreadIdType
;
429 class WXDLLIMPEXP_BASE wxThread
432 // the return type for the thread function
433 typedef void *ExitCode
;
436 // Returns the wxThread object for the calling thread. NULL is returned
437 // if the caller is the main thread (but it's recommended to use
438 // IsMain() and only call This() for threads other than the main one
439 // because NULL is also returned on error). If the thread wasn't
440 // created with wxThread class, the returned value is undefined.
441 static wxThread
*This();
443 // Returns true if current thread is the main thread.
444 static bool IsMain();
446 // Release the rest of our time slice letting the other threads run
449 // Sleep during the specified period of time in milliseconds
451 // This is the same as wxMilliSleep().
452 static void Sleep(unsigned long milliseconds
);
454 // get the number of system CPUs - useful with SetConcurrency()
455 // (the "best" value for it is usually number of CPUs + 1)
457 // Returns -1 if unknown, number of CPUs otherwise
458 static int GetCPUCount();
460 // Get the platform specific thread ID and return as a long. This
461 // can be used to uniquely identify threads, even if they are not
462 // wxThreads. This is used by wxPython.
463 static wxThreadIdType
GetCurrentId();
465 // sets the concurrency level: this is, roughly, the number of threads
466 // the system tries to schedule to run in parallel. 0 means the
467 // default value (usually acceptable, but may not yield the best
468 // performance for this process)
470 // Returns true on success, false otherwise (if not implemented, for
472 static bool SetConcurrency(size_t level
);
474 // constructor only creates the C++ thread object and doesn't create (or
475 // start) the real thread
476 wxThread(wxThreadKind kind
= wxTHREAD_DETACHED
);
478 // functions that change the thread state: all these can only be called
479 // from _another_ thread (typically the thread that created this one, e.g.
480 // the main thread), not from the thread itself
482 // create a new thread and optionally set the stack size on
483 // platforms that support that - call Run() to start it
484 // (special cased for watcom which won't accept 0 default)
486 wxThreadError
Create(unsigned int stackSize
= 0);
488 // starts execution of the thread - from the moment Run() is called
489 // the execution of wxThread::Entry() may start at any moment, caller
490 // shouldn't suppose that it starts after (or before) Run() returns.
493 // stops the thread if it's running and deletes the wxThread object if
494 // this is a detached thread freeing its memory - otherwise (for
495 // joinable threads) you still need to delete wxThread object
498 // this function only works if the thread calls TestDestroy()
499 // periodically - the thread will only be deleted the next time it
502 // will fill the rc pointer with the thread exit code if it's !NULL
503 wxThreadError
Delete(ExitCode
*rc
= (ExitCode
*)NULL
);
505 // waits for a joinable thread to finish and returns its exit code
507 // Returns (ExitCode)-1 on error (for example, if the thread is not
511 // kills the thread without giving it any chance to clean up - should
512 // not be used under normal circumstances, use Delete() instead.
513 // It is a dangerous function that should only be used in the most
516 // The wxThread object is deleted by Kill() if the thread is
517 // detachable, but you still have to delete it manually for joinable
519 wxThreadError
Kill();
521 // pause a running thread: as Delete(), this only works if the thread
522 // calls TestDestroy() regularly
523 wxThreadError
Pause();
525 // resume a paused thread
526 wxThreadError
Resume();
529 // Sets the priority to "prio": see WXTHREAD_XXX_PRIORITY constants
531 // NB: the priority can only be set before the thread is created
532 void SetPriority(unsigned int prio
);
534 // Get the current priority.
535 unsigned int GetPriority() const;
537 // thread status inquiries
538 // Returns true if the thread is alive: i.e. running or suspended
539 bool IsAlive() const;
540 // Returns true if the thread is running (not paused, not killed).
541 bool IsRunning() const;
542 // Returns true if the thread is suspended
543 bool IsPaused() const;
545 // is the thread of detached kind?
546 bool IsDetached() const { return m_isDetached
; }
548 // Get the thread ID - a platform dependent number which uniquely
549 // identifies a thread inside a process
550 wxThreadIdType
GetId() const;
552 // called when the thread exits - in the context of this thread
554 // NB: this function will not be called if the thread is Kill()ed
555 virtual void OnExit() { }
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 virtual bool TestDestroy();
562 // dtor is public, but the detached threads should never be deleted - use
563 // Delete() instead (or leave the thread terminate by itself)
567 // exits from the current thread - can be called only from this thread
568 void Exit(ExitCode exitcode
= 0);
570 // entry point for the thread - called by Run() and executes in the context
572 virtual void *Entry() = 0;
575 // no copy ctor/assignment operator
576 wxThread(const wxThread
&);
577 wxThread
& operator=(const wxThread
&);
579 friend class wxThreadInternal
;
581 // the (platform-dependent) thread class implementation
582 wxThreadInternal
*m_internal
;
584 // protects access to any methods of wxThreadInternal object
585 wxCriticalSection m_critsect
;
587 // true if the thread is detached, false if it is joinable
591 // wxThreadHelperThread class
592 // --------------------------
594 class WXDLLIMPEXP_BASE wxThreadHelperThread
: public wxThread
597 // constructor only creates the C++ thread object and doesn't create (or
598 // start) the real thread
599 wxThreadHelperThread(wxThreadHelper
& owner
, wxThreadKind kind
)
600 : wxThread(kind
), m_owner(owner
)
604 // entry point for the thread -- calls Entry() in owner.
605 virtual void *Entry();
608 // the owner of the thread
609 wxThreadHelper
& m_owner
;
611 // no copy ctor/assignment operator
612 wxThreadHelperThread(const wxThreadHelperThread
&);
613 wxThreadHelperThread
& operator=(const wxThreadHelperThread
&);
616 // ----------------------------------------------------------------------------
617 // wxThreadHelper: this class implements the threading logic to run a
618 // background task in another object (such as a window). It is a mix-in: just
619 // derive from it to implement a threading background task in your class.
620 // ----------------------------------------------------------------------------
622 class WXDLLIMPEXP_BASE wxThreadHelper
627 // If detached thread is about to finish, it will set
628 // m_thread to NULL so don't delete it then
629 // But if KillThread is called before detached thread
630 // sets it to NULL, then the thread object still
631 // exists and can be killed
632 wxCriticalSectionLocker
locker(m_critSection
);
638 if ( m_kind
== wxTHREAD_JOINABLE
)
646 // constructor only initializes m_thread to NULL
647 wxThreadHelper(wxThreadKind kind
= wxTHREAD_JOINABLE
)
648 : m_thread(NULL
), m_kind(kind
) { }
650 // destructor deletes m_thread
651 virtual ~wxThreadHelper() { KillThread(); }
653 // create a new thread (and optionally set the stack size on platforms that
654 // support/need that), call Run() to start it
655 wxThreadError
Create(unsigned int stackSize
= 0)
659 m_thread
= new wxThreadHelperThread(*this, m_kind
);
661 return m_thread
->Create(stackSize
);
664 // entry point for the thread - called by Run() and executes in the context
666 virtual void *Entry() = 0;
668 // returns a pointer to the thread which can be used to call Run()
669 wxThread
*GetThread() const
671 wxCriticalSectionLocker
locker((wxCriticalSection
&)m_critSection
);
673 wxThread
* thread
= m_thread
;
681 wxCriticalSection m_critSection
; // To guard the m_thread variable
683 friend class wxThreadHelperThread
;
686 // call Entry() in owner, put it down here to avoid circular declarations
687 inline void *wxThreadHelperThread
::Entry()
689 void * const result
= m_owner
.Entry();
691 wxCriticalSectionLocker
locker(m_owner
.m_critSection
);
693 // Detached thread will be deleted after returning, so make sure
694 // wxThreadHelper::GetThread will not return an invalid pointer.
695 // And that wxThreadHelper::KillThread will not try to kill
696 // an already deleted thread
697 if ( m_owner
.m_kind
== wxTHREAD_DETACHED
)
698 m_owner
.m_thread
= NULL
;
703 // ----------------------------------------------------------------------------
704 // Automatic initialization
705 // ----------------------------------------------------------------------------
707 // GUI mutex handling.
708 void WXDLLIMPEXP_BASE
wxMutexGuiEnter();
709 void WXDLLIMPEXP_BASE
wxMutexGuiLeave();
711 // macros for entering/leaving critical sections which may be used without
712 // having to take them inside "#if wxUSE_THREADS"
713 #define wxENTER_CRIT_SECT(cs) (cs).Enter()
714 #define wxLEAVE_CRIT_SECT(cs) (cs).Leave()
715 #define wxCRIT_SECT_DECLARE(cs) static wxCriticalSection cs
716 #define wxCRIT_SECT_DECLARE_MEMBER(cs) wxCriticalSection cs
717 #define wxCRIT_SECT_LOCKER(name, cs) wxCriticalSectionLocker name(cs)
719 // function for checking if we're in the main thread which may be used whether
720 // wxUSE_THREADS is 0 or 1
721 inline bool wxIsMainThread() { return wxThread
::IsMain(); }
723 #else // !wxUSE_THREADS
726 inline void wxMutexGuiEnter() { }
727 inline void wxMutexGuiLeave() { }
729 // macros for entering/leaving critical sections which may be used without
730 // having to take them inside "#if wxUSE_THREADS"
731 // (the implementation uses dummy structs to force semicolon after the macro)
732 #define wxENTER_CRIT_SECT(cs) do {} while (0)
733 #define wxLEAVE_CRIT_SECT(cs) do {} while (0)
734 #define wxCRIT_SECT_DECLARE(cs) struct wxDummyCS##cs
735 #define wxCRIT_SECT_DECLARE_MEMBER(cs) struct wxDummyCSMember##cs
736 #define wxCRIT_SECT_LOCKER(name, cs) struct wxDummyCSLocker##name
738 // if there is only one thread, it is always the main one
739 inline bool wxIsMainThread() { return true; }
741 #endif // wxUSE_THREADS/!wxUSE_THREADS
743 // mark part of code as being a critical section: this macro declares a
744 // critical section with the given name and enters it immediately and leaves
745 // it at the end of the current scope
751 // static int s_counter = 0;
753 // wxCRITICAL_SECTION(counter);
755 // return ++s_counter;
758 // this function is MT-safe in presence of the threads but there is no
759 // overhead when the library is compiled without threads
760 #define wxCRITICAL_SECTION(name) \
761 wxCRIT_SECT_DECLARE(s_cs##name); \
762 wxCRIT_SECT_LOCKER(cs##name##Locker, s_cs##name)
764 // automatically lock GUI mutex in ctor and unlock it in dtor
765 class WXDLLIMPEXP_BASE wxMutexGuiLocker
768 wxMutexGuiLocker() { wxMutexGuiEnter(); }
769 ~wxMutexGuiLocker() { wxMutexGuiLeave(); }
772 // -----------------------------------------------------------------------------
773 // implementation only until the end of file
774 // -----------------------------------------------------------------------------
778 #if defined(__WXMSW__) || defined(__OS2__) || defined(__EMX__)
779 // unlock GUI if there are threads waiting for and lock it back when
780 // there are no more of them - should be called periodically by the main
782 extern void WXDLLIMPEXP_BASE
wxMutexGuiLeaveOrEnter();
784 // returns true if the main thread has GUI lock
785 extern bool WXDLLIMPEXP_BASE
wxGuiOwnedByMainThread();
787 // wakes up the main thread if it's sleeping inside ::GetMessage()
788 extern void WXDLLIMPEXP_BASE
wxWakeUpMainThread();
790 // return true if the main thread is waiting for some other to terminate:
791 // wxApp then should block all "dangerous" messages
792 extern bool WXDLLIMPEXP_BASE
wxIsWaitingForThread();
795 #endif // wxUSE_THREADS
797 #endif // _WX_THREAD_H_