¿Cómo se usa CreateThread para funciones que son miembros de la clase?

¿Cómo se usa CreateThread() para crear hilos de funciones que son miembros de la clase?

Necesita crear un método estático para usar como la función de inicio de subproceso real, y pasar un puntero a la instancia como el argumento CreateThread a CreateThread . Eso pasará al método estático, que puede convertirlo en un puntero de objeto y llamar a la función de miembro.

 class MyClass { static DWORD WINAPI StaticThreadStart(void* Param) { MyClass* This = (MyClass*) Param; return This->ThreadStart(); } DWORD ThreadStart(void) { // Do stuff } void startMyThread() { DWORD ThreadID; CreateThread(NULL, 0, StaticThreadStart, (void*) this, 0, &ThreadID); } }; 

Otros que se cruzan, pueden querer usar mi solución. Es un archivo fuente completo comstackdo con VS2008. ¡Vea a continuación un breve ejemplo de instrucciones sobre cómo usar!

 // Thread.h #ifndef __THREAD_H__ #define __THREAD_H__ // ############################################################################# #define WIN32_LEAN_AND_MEAN #include  // ============================================================================= template class Thread { // new type Method: pointer to a object's method (this call) typedef DWORD (T::* Method)(void); // ----------------------------------------------------------------------------- protected: HANDLE hThread; // unique handle to the thread private: DWORD threadID; // thread id - 0 until started T* object; // the object which owns the method Method method; // the method of the object HANDLE hInterrupt; // mutex to signal an interrupt via ReleaseSemaphore() HANDLE hSingleStart; // only one thread allowed to call start() mutex // ----------------------------------------------------------------------------- private: // This function gets executed by a concurrent thread. static DWORD run(LPVOID thread_obj) { Thread* thread = (Thread*)thread_obj; return (thread->object->*thread->method) (); } // Prevent copying of threads: No sensible implementation! Thread(const Thread& other) {} // Prevent assignment of threads: No sensible implementation! Thread& operator =(const Thread& other) {} // ----------------------------------------------------------------------------- public: /* Creates a new Thread object. object: the one which method should be executed. method: pointer to the object's method. */ explicit Thread(T* object, DWORD ( T::* method)(void)) { this->hThread = NULL; this->object = object; this->method = method; this->threadID = 0; this->hInterrupt = CreateSemaphore(NULL, 1, 1, NULL); this->hSingleStart = CreateMutex(NULL, FALSE, NULL); // this->hInterrupt = CreateMutex(NULL, FALSE, NULL); } // ----------------------------------------------------------------------------- ~Thread(void) { if (hInterrupt) CloseHandle(hInterrupt); if (hThread) CloseHandle(hThread); } // ----------------------------------------------------------------------------- /* Starts executing the objects method in a concurrent thread. True if the thread was started successfully; otherwise false. */ bool start() { __try { if (WaitForSingleObject(hSingleStart, 0) != WAIT_OBJECT_0) return false; if (hThread) // Thread had been started sometime in the past { if (WaitForSingleObject(hThread, 0) == WAIT_TIMEOUT) { // if thread's still running deny new start return false; } CloseHandle(hThread); } // (Re-)Set not interrupted semaphore state WaitForSingleObject(hInterrupt, 0); hThread = CreateThread( NULL, 0, (LPTHREAD_START_ROUTINE) Thread::run, this, 0, &this->threadID ); if (hThread) return true; return false; } __finally { ReleaseMutex(hSingleStart); } } // ----------------------------------------------------------------------------- // Blocks the calling thread until this thread has stopped. inline void join() { WaitForSingleObject(hThread, INFINITE); } // ----------------------------------------------------------------------------- /* Asks the thread to exit nicely. Thread function must implement checks. return value indicates if the interrupt could be placed not if the thread reacts on the interrupt. true indicates success, false an error. */ inline bool interrupt() { if (hInterrupt) { return ((ReleaseSemaphore(hInterrupt, 1, NULL) == FALSE) ? false : true); } return false; } // ----------------------------------------------------------------------------- /* True if an interrupt request was set, otherwise false. */ inline bool isInterrupted() { return this->isInterrupted(0); } // ----------------------------------------------------------------------------- /* True if an interrupt request was set, otherwise false. Waits for millisec milliseconds for the interrupt to take place. */ inline bool isInterrupted(DWORD millisec) { if (WaitForSingleObject(hInterrupt, millisec) == WAIT_TIMEOUT) { return false; } ReleaseSemaphore(hInterrupt, 1, NULL); // keep interrupted state return true; } // ----------------------------------------------------------------------------- inline bool isRunning() { DWORD exitCode = 0; if (hThread) GetExitCodeThread(hThread, &exitCode); if (exitCode == STILL_ACTIVE) return true; return false; } // ----------------------------------------------------------------------------- // Getter & Setter // ----------------------------------------------------------------------------- __declspec(property(get = getThreadHandle)) HANDLE ThreadHandle; inline HANDLE getThreadHandle() { return hThread; } // ----------------------------------------------------------------------------- __declspec(property(get = getThreadID)) DWORD ThreadID; inline DWORD getThreadID() { return threadID; } // ----------------------------------------------------------------------------- }; // ############################################################################# #endif // __THREAD_H__ 

Ejemplo corto:

 // main.cpp #include  #include  #include "Thread.h" class HelloWorld { public: DWORD print () { std::cout < < "Hello World!" << std::endl; return 0; } }; int main(void) { // Random object with DWORD method (void) HelloWorld world; // thread should call print method of world. Thread thread(&world, &HelloWorld::print); if (thread.start()) std::cout < < "Thread start()" << std::endl; thread.join(); // wait for thread return 0; }