C语言多线程编程中互斥锁的使用

#include <pthread.h>

// 定义互斥锁
pthread_mutex_t account_lock;

// 银行账户
int account_balance = 0;

// 线程函数
void *thread_func(void *arg) {
    // 获取互斥锁
    pthread_mutex_lock(&account_lock);

    // 获取当前余额
    int balance = account_balance;

    // 模拟存款或取款
    balance += rand() % 100;

    // 更新余额
    account_balance = balance;

    // 释放互斥锁
    pthread_mutex_unlock(&account_lock);

    return NULL;
}

int main() {
    // 初始化互斥锁
    pthread_mutex_init(&account_lock, NULL);

    // 创建 10 个线程并让它们同时运行
    pthread_t threads[10];
    for (int i = 0; i < 10; i++) {
        pthread_create(&threads[i], NULL, thread_func, NULL);
    }

    // 等待所有线程结束
    for (int i = 0; i < 10; i++) {
        pthread_join(threads[i], NULL);
    }

    // 输出最终余额
    printf("Final balance: %d\n", account_balance);

    // 销毁互斥锁
    pthread_mutex_destroy(&account_lock);

    return 0;
}