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文件大小: 17mb
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上传时间: 2015-04-23
详细说明： 多线程 求质数 返回数组中的最大值 bool isPrime(long x) { if (x <= 1) return false; if (x == 2) return true; for (long i = 2; i <= ceil(sqrt((long double)x));i++) if (x%i == 0) return false; return true; } DWORD WINAPI findPrime(void* p) { long result=0; int l = stc(p)->lower, u = stc(p)->uper; int t_id=GetCurrentThreadId(); for (int i = l; i <= u;i++) if (isPrime(i)) { result++; } DWORD dReturn = WaitForSingleObject(mutex_mul_result_h, INFINITE); mul_result += result; ReleaseMutex(mutex_mul_result_h); //Enter CriticalSection(&gCRITICAL_SECTION_Printf); //printf("%d,%d,%d,%d\n", l, u, result,t_id); //fflush(stdout); //LeaveCriticalSection(&gCRITICAL_SECTION_Printf); return 0; } //dispatcher void dispatch() { DWORD Status; timer tm; tm.start(); //srand(time(NULL)); long step = STEP;//ceil(double(TEST/10)); handlenum = 0; for (int i = 1; i <= TEST;) { i += step; handlenum++; } handle_array=new HANDLE[handlenum]; Thread_id = new DWORD[handlenum ]; arg = new FP_ARG[handlenum]; InitializeCriticalSection(&gCRITICAL_SECTION_Printf); mutex_mul_result_h = CreateMutex(NULL, false, mutex_mul_result); handlenum = 0; for (int i = 1; i <= TEST;) { arg[handlenum].lower = i; arg[handlenum].uper = (i + step-1>TEST) ? TEST : i + step-1; handle_array[handlenum]=(HANDLE)CreateThread(NULL, 0, findPrime, &arg[handlenum], 0, &Thread_id[handlenum]); /*EnterCriticalSection(&gCRITICAL_SECTION_Printf); printf("lower:%d uper:%d thread_id:%d\n", arg[handlenum].lower, arg[handlenum].uper,Thread_id[handlenum]); LeaveCriticalSection(&gCRITICAL_SECTION_Printf);*/ i += step; handlenum++; } tm.stop(); Sleep(1000); printf("there are %d threads\n", handlenum); printf("the multithreads use %f msc\n", tm.read()); } //the number of 1-1000000 Primenumber void s_finePrime() { timer tm; long result = 0; tm.start(); for (int i = 1; i <= TEST; i++) if (isPrime(i)) result++; tm.stop(); printf("Single thread result is %d\n", result); printf("Single thread use %f msc\n", tm.read()); } int _tmain(int argc, _TCHAR* argv[]) { dispatch(); WaitForMultipleObjects(handlenum, handle_array, true, INFINITE);//不起作用 printf("the multithreads reslut is %d\n", mul_result); CloseHandle(mutex_mul_result_h); DeleteCriticalSection(&gCRITICAL_SECTION_Printf); s_finePrime(); system("pause"); return 0; } ...展开收缩
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