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Project 2 教學

Project 2 教學. S ynchronization Functions in Windows. HANDLE WINAPI CreateSemaphore ( __ in_opt LPSECURITY_ATTRIBUTES lpSemaphoreAttributes , __in LONG lInitialCount , __in LONG lMaximumCount , __ in_opt LPCTSTR lpName ); 

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Project 2 教學

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  1. Project 2 教學

  2. Synchronization Functionsin Windows HANDLE WINAPI CreateSemaphore ( __in_opt LPSECURITY_ATTRIBUTES lpSemaphoreAttributes, __in LONG lInitialCount, __in LONG lMaximumCount, __in_opt LPCTSTR lpName );  EX：The max value for the semaphore Sem is 5, and its initial value is 0 • HANDLE Sem; • Sem = CreateSemaphore( NULL ,0 ,5 ,NULL);

  3. Synchronization Functionsin Windows DWORD WINAPI WaitForSingleObject ( __in HANDLE hHandle, __in DWORD dwMilliseconds ); EX：to wait for a semaphore WaitForSingleObject( Sem, INFINITE );

  4. Synchronization Functionsin Windows BOOL WINAPI ReleaseSemaphore ( __in HANDLE hSemaphore, __in LONG lReleaseCount, __out_opt LPLONG lpPreviousCount ); EX：to signal a sempahore ReleaseSemaphore(Sem, 1, NULL);

  5. Synchronization Functionsin Windows HANDLE WINAPI CreateThread ( __in_opt LPSECURITY_ATTRIBUTES lpThreadAttributes, __in SIZE_T dwStackSize, __in LPTHREAD_START_ROUTINE lpStartAddress, __in_opt LPVOID lpParameter, __in DWORD dwCreationFlags, __out_opt LPDWORD lpThreadId ); EX: to create a thread to execute function ABC CreateThread(NULL, 0,(LPTHREAD_START_ROUTINE)ABC, NULL, 0,&ThreadID);

  6. Synchronization Functionsin Windows • #include <windows.h> • #include <process.h> • 可以使用Dev-c或VC

  7. EX:Hw2 in Windows • int main(void) • { • full=CreateSemaphore( NULL ,0 ,5 ,NULL); • empty=CreateSemaphore( NULL ,5 ,5 ,NULL); • intj, *tid_arg; • srand((int)time(0)); • printf("start\n"); • tid_arg= (int *) malloc(sizeof(int)); • *tid_arg = 1; • DWORD tid; • Thread[0]=CreateThread(NULL, 0,(LPTHREAD_START_ROUTINE)producer, (void*)tid_arg, 0, &tid); • Thread[1]=CreateThread(NULL, 0,(LPTHREAD_START_ROUTINE)consumer, (void*)tid_arg, 0, &tid); • WaitForMultipleObjects(2, Thread, TRUE, INFINITE); • system("pause"); • return 0; • }

  8. EX:Hw2 in Windows • void * producer(void *arg) • { printf("p_in\n"); • inti,tid,in_data; • tid = *((int *) arg); • free(arg); • for (i=0;i<12;i++){ • WaitForSingleObject( empty, INFINITE); • Sleep(rand()%5); • in_data=rand()%256; • printf(">>p(%d) =(%d),buf[%d]\n", i, in_data,top); • buf[top] = in_data; • top=(top+1)%5; • ReleaseSemaphore(full, 1, NULL); • } • return 0; • }

  9. EX:Hw2 in Windows • void * consumer(void *arg) • { • printf("c_in\n"); • inti,tid,out_data; • tid = *((int *) arg); • free(arg); • for (i=0;i<12;i++){ • WaitForSingleObject( full, INFINITE); • Sleep(rand()%10); • out_data=buf[down]; • printf(">>c(%d) =(%d),buf[%d]\n", i, out_data,down); • down=(down+1)%5; • ReleaseSemaphore(empty, 1, NULL); • } • return 0; • }

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