releasemutex

#include <windows.h>
#include <stdio.h>

HANDLE hMutex;

void AccessSharedResource() {
    // 尝试获取互斥对象的锁
    DWORD dwWaitResult = WaitForSingleObject(hMutex, INFINITE);
    if (dwWaitResult == WAIT_OBJECT_0) {
        // 成功获取锁，访问共享资源
        printf("Accessing shared resource...\n");
        // 模拟访问共享资源的操作
        Sleep(1000);
        printf("Finished accessing shared resource.\n");

        // 释放互斥对象的锁
        if (!ReleaseMutex(hMutex)) {
            printf("Failed to release mutex. Error: %d\n", GetLastError());
        }
    } else {
        printf("Failed to acquire mutex. Error: %d\n", GetLastError());
    }
}

int main() {
    // 创建一个命名互斥对象
    hMutex = CreateMutex(NULL, FALSE, "MyNamedMutex");
    if (hMutex == NULL) {
        printf("Failed to create mutex. Error: %d\n", GetLastError());
        return 1;
    }

    // 启动多个线程访问共享资源
    HANDLE hThreads[2];
    for (int i = 0; i < 2; ++i) {
        hThreads[i] = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)AccessSharedResource, NULL, 0, NULL);
        if (hThreads[i] == NULL) {
            printf("Failed to create thread. Error: %d\n", GetLastError());
            CloseHandle(hMutex);
            return 1;
        }
    }

    // 等待所有线程完成
    WaitForMultipleObjects(2, hThreads, TRUE, INFINITE);

    // 关闭线程句柄
    for (int i = 0; i < 2; ++i) {
        CloseHandle(hThreads[i]);
    }

    // 关闭互斥对象句柄
    CloseHandle(hMutex);

    return 0;
}