基于Windows操作系统屏障同步代码
时间: 2023-08-19 08:38:08 浏览: 50
以下是基于Windows操作系统的屏障同步代码示例,使用了事件对象和互斥对象:
```
#include <Windows.h>
#include <iostream>
#include <vector>
using namespace std;
const int THREAD_NUM = 4;
const int BARRIER_COUNT = 3;
HANDLE barrier_mutex;
HANDLE barrier_event;
int count = 0;
DWORD WINAPI ThreadFunc(LPVOID lpParam) {
int thread_id = *(int*)lpParam;
for (int i = 0; i < BARRIER_COUNT; i++) {
// 等待所有线程到达屏障
WaitForSingleObject(barrier_mutex, INFINITE);
count++;
ReleaseMutex(barrier_mutex);
if (count == THREAD_NUM) {
SetEvent(barrier_event);
}
// 等待屏障释放
WaitForSingleObject(barrier_event, INFINITE);
// 重置屏障状态
WaitForSingleObject(barrier_mutex, INFINITE);
count--;
if (count == 0) {
ResetEvent(barrier_event);
}
ReleaseMutex(barrier_mutex);
cout << "Thread " << thread_id << " passed barrier " << i << endl;
}
return 0;
}
int main() {
HANDLE threads[THREAD_NUM];
int thread_ids[THREAD_NUM];
// 创建互斥对象和事件对象
barrier_mutex = CreateMutex(NULL, FALSE, NULL);
barrier_event = CreateEvent(NULL, TRUE, FALSE, NULL);
// 创建线程
for (int i = 0; i < THREAD_NUM; i++) {
thread_ids[i] = i;
threads[i] = CreateThread(NULL, 0, ThreadFunc, &thread_ids[i], 0, NULL);
}
// 等待所有线程结束
WaitForMultipleObjects(THREAD_NUM, threads, TRUE, INFINITE);
// 关闭句柄
CloseHandle(barrier_mutex);
CloseHandle(barrier_event);
for (int i = 0; i < THREAD_NUM; i++) {
CloseHandle(threads[i]);
}
return 0;
}
```
该示例创建了4个线程,每个线程都要通过3个屏障。屏障同步使用了一个互斥对象和一个事件对象。在每个线程到达屏障时,会对计数器进行加1操作,并等待所有线程到达屏障。当所有线程都到达屏障时,会设置事件对象,唤醒所有线程。在所有线程通过屏障后,会重置计数器和事件对象,以便下一轮屏障同步的使用。