X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/b568d04ffa191f9e3b643ca33526094eca0ba304..bc55104d9ab0b0b835644f17a152b4fbbfa8c7b9:/include/wx/thread.h diff --git a/include/wx/thread.h b/include/wx/thread.h index 3f1415adc7..7dd5cfa621 100644 --- a/include/wx/thread.h +++ b/include/wx/thread.h @@ -40,21 +40,21 @@ enum wxMutexError { - wxMUTEX_NO_ERROR = 0, - wxMUTEX_DEAD_LOCK, // Mutex has been already locked by THE CALLING thread - wxMUTEX_BUSY, // Mutex has been already locked by ONE thread - wxMUTEX_UNLOCKED, - wxMUTEX_MISC_ERROR + wxMUTEX_NO_ERROR = 0, + wxMUTEX_DEAD_LOCK, // Mutex has been already locked by THE CALLING thread + wxMUTEX_BUSY, // Mutex has been already locked by ONE thread + wxMUTEX_UNLOCKED, + wxMUTEX_MISC_ERROR }; enum wxThreadError { - wxTHREAD_NO_ERROR = 0, // No error - wxTHREAD_NO_RESOURCE, // No resource left to create a new thread - wxTHREAD_RUNNING, // The thread is already running - wxTHREAD_NOT_RUNNING, // The thread isn't running - wxTHREAD_KILLED, // Thread we waited for had to be killed - wxTHREAD_MISC_ERROR // Some other error + wxTHREAD_NO_ERROR = 0, // No error + wxTHREAD_NO_RESOURCE, // No resource left to create a new thread + wxTHREAD_RUNNING, // The thread is already running + wxTHREAD_NOT_RUNNING, // The thread isn't running + wxTHREAD_KILLED, // Thread we waited for had to be killed + wxTHREAD_MISC_ERROR // Some other error }; enum wxThreadKind @@ -99,14 +99,12 @@ public: bool IsLocked() const { return (m_locked > 0); } protected: - friend class wxCondition; - // no assignment operator nor copy ctor wxMutex(const wxMutex&); wxMutex& operator=(const wxMutex&); int m_locked; - wxMutexInternal *p_internal; + wxMutexInternal *m_internal; }; // a helper class which locks the mutex in the ctor and unlocks it in the dtor: @@ -150,11 +148,11 @@ class WXDLLEXPORT wxCriticalSectionInternal; // in order to avoid any overhead under platforms where critical sections are // just mutexes make all wxCriticalSection class functions inline -#if !defined(__WXMSW__) && !defined(__WXPM__) && !defined(__WXMAC__) +#if !defined(__WXMSW__) && !defined(__WXPM__) #define WXCRITICAL_INLINE inline #define wxCRITSECT_IS_MUTEX 1 -#else // MSW || Mac || OS2 +#else // MSW || OS2 #define WXCRITICAL_INLINE #define wxCRITSECT_IS_MUTEX 0 @@ -213,28 +211,37 @@ private: }; // ---------------------------------------------------------------------------- -// Condition handler. +// Condition variable: allows to block the thread execution until something +// happens (== condition is signaled) // ---------------------------------------------------------------------------- class wxConditionInternal; class WXDLLEXPORT wxCondition { public: - // constructor & destructor - wxCondition(); - ~wxCondition(); - - // Waits indefinitely. - void Wait(wxMutex& mutex); - // Waits until a signal is raised or the timeout is elapsed. - bool Wait(wxMutex& mutex, unsigned long sec, unsigned long nsec); - // Raises a signal: only one "Waiter" is released. - void Signal(); - // Broadcasts to all "Waiters". - void Broadcast(); + // constructor & destructor + wxCondition(); + ~wxCondition(); + + // wait until the condition is signaled + // waits indefinitely. + void Wait(); + // waits until a signal is raised or the timeout elapses + bool Wait(unsigned long sec, unsigned long nsec); + + // signal the condition + // wakes up one (and only one) of the waiting threads + void Signal(); + // wakes up all threads waiting on this condition + void Broadcast(); + +#ifdef __WXDEBUG__ + // for debugging purposes only + void *GetId() const { return m_internal; } +#endif // __WXDEBUG__ private: - wxConditionInternal *p_internal; + wxConditionInternal *m_internal; }; // ---------------------------------------------------------------------------- @@ -250,6 +257,13 @@ private: // created by the wxThread object while "main thread" is the thread created // during the process initialization (a.k.a. the GUI thread) +// On VMS thread pointers are 64 bits (also needed for other systems??? +#ifdef __VMS + typedef unsigned long long wxThreadIdType; +#else + typedef unsigned long wxThreadIdType; +#endif + class wxThreadInternal; class WXDLLEXPORT wxThread { @@ -276,6 +290,26 @@ public: // NB: at least under MSW worker threads can not call ::wxSleep()! static void Sleep(unsigned long milliseconds); + // get the number of system CPUs - useful with SetConcurrency() + // (the "best" value for it is usually number of CPUs + 1) + // + // Returns -1 if unknown, number of CPUs otherwise + static int GetCPUCount(); + + // Get the platform specific thread ID and return as a long. This + // can be used to uniquely identify threads, even if they are not + // wxThreads. This is used by wxPython. + static wxThreadIdType GetCurrentId(); + + // sets the concurrency level: this is, roughly, the number of threads + // the system tries to schedule to run in parallel. 0 means the + // default value (usually acceptable, but may not yield the best + // performance for this process) + // + // Returns TRUE on success, FALSE otherwise (if not implemented, for + // example) + static bool SetConcurrency(size_t level); + // constructor only creates the C++ thread object and doesn't create (or // start) the real thread wxThread(wxThreadKind kind = wxTHREAD_DETACHED); @@ -284,8 +318,11 @@ public: // from _another_ thread (typically the thread that created this one, e.g. // the main thread), not from the thread itself - // create a new thread - call Run() to start it - wxThreadError Create(); + // create a new thread and optionally set the stack size on + // platforms that support that - call Run() to start it + // (special cased for watcom which won't accept 0 default) + + wxThreadError Create(unsigned int stackSize = 0); // starts execution of the thread - from the moment Run() is called // the execution of wxThread::Entry() may start at any moment, caller @@ -349,7 +386,7 @@ public: // Get the thread ID - a platform dependent number which uniquely // identifies a thread inside a process - unsigned long GetId() const; + wxThreadIdType GetId() const; // called when the thread exits - in the context of this thread // @@ -381,7 +418,7 @@ private: friend class wxThreadInternal; // the (platform-dependent) thread class implementation - wxThreadInternal *p_internal; + wxThreadInternal *m_internal; // protects access to any methods of wxThreadInternal object wxCriticalSection m_critsect; @@ -402,6 +439,7 @@ void WXDLLEXPORT wxMutexGuiLeave(); // having to take them inside "#if wxUSE_THREADS" #define wxENTER_CRIT_SECT(cs) (cs).Enter() #define wxLEAVE_CRIT_SECT(cs) (cs).Leave() +#define wxCRIT_SECT_DECLARE(cs) static wxCriticalSection cs #define wxCRIT_SECT_LOCKER(name, cs) wxCriticalSectionLocker name(cs) #else // !wxUSE_THREADS @@ -416,6 +454,7 @@ inline void WXDLLEXPORT wxMutexGuiLeave() { } // having to take them inside "#if wxUSE_THREADS" #define wxENTER_CRIT_SECT(cs) #define wxLEAVE_CRIT_SECT(cs) +#define wxCRIT_SECT_DECLARE(cs) #define wxCRIT_SECT_LOCKER(name, cs) #endif // wxUSE_THREADS @@ -450,7 +489,7 @@ public: // wxApp then should block all "dangerous" messages extern bool WXDLLEXPORT wxIsWaitingForThread(); #elif defined(__WXMAC__) - extern void WXDLLEXPORT wxMutexGuiLeaveOrEnter(); + extern void WXDLLEXPORT wxMutexGuiLeaveOrEnter(); // returns TRUE if the main thread has GUI lock extern bool WXDLLEXPORT wxGuiOwnedByMainThread(); @@ -461,6 +500,13 @@ public: // return TRUE if the main thread is waiting for some other to terminate: // wxApp then should block all "dangerous" messages extern bool WXDLLEXPORT wxIsWaitingForThread(); + + // implement wxCriticalSection using mutexes + inline wxCriticalSection::wxCriticalSection() { } + inline wxCriticalSection::~wxCriticalSection() { } + + inline void wxCriticalSection::Enter() { (void)m_mutex.Lock(); } + inline void wxCriticalSection::Leave() { (void)m_mutex.Unlock(); } #elif defined(__WXPM__) // unlock GUI if there are threads waiting for and lock it back when // there are no more of them - should be called periodically by the main @@ -493,3 +539,5 @@ public: #endif // wxUSE_THREADS #endif // __THREADH__ + +// vi:sts=4:sw=4:et