linux c 多线程 等待

#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
int ready = 0;

void* thread_func(void* arg) {
    printf("子线程开始执行\n");
    sleep(2); // 模拟耗时操作
    pthread_mutex_lock(&mutex);
    ready = 1;
    pthread_mutex_unlock(&mutex);
    printf("子线程执行完毕\n");
    return NULL;
}

int main() {
    pthread_t thread;
    pthread_create(&thread, NULL, thread_func, NULL);

    pthread_mutex_lock(&mutex);
    while (!ready) {
        pthread_mutex_unlock(&mutex);
        usleep(100); // 避免忙等待
        pthread_mutex_lock(&mutex);
    }
    pthread_mutex_unlock(&mutex);

    printf("主线程继续执行\n");
    pthread_join(thread, NULL);
    return 0;
}

pthread_mutex_t mutex1 = PTHREAD_MUTEX_INITIALIZER;
pthread_mutex_t mutex2 = PTHREAD_MUTEX_INITIALIZER;

void* thread1_func(void* arg) {
    pthread_mutex_lock(&mutex1);
    pthread_mutex_lock(&mutex2);
    // 执行操作
    pthread_mutex_unlock(&mutex2);
    pthread_mutex_unlock(&mutex1);
    return NULL;
}

void* thread2_func(void* arg) {
    pthread_mutex_lock(&mutex1); // 确保加锁顺序与thread1_func一致
    pthread_mutex_lock(&mutex2);
    // 执行操作
    pthread_mutex_unlock(&mutex2);
    pthread_mutex_unlock(&mutex1);
    return NULL;
}