linux 线程挂起 恢复

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

pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
int ready = 0;

void* thread_func(void* arg) {
    pthread_mutex_lock(&mutex);
    while (!ready) {
        printf("Thread is waiting...\n");
        pthread_cond_wait(&cond, &mutex); // 线程挂起等待条件变量
    }
    printf("Thread is running!\n");
    pthread_mutex_unlock(&mutex);
    return NULL;
}

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

    sleep(3); // 主线程休眠3秒

    pthread_mutex_lock(&mutex);
    ready = 1; // 设置条件变量
    pthread_cond_signal(&cond); // 唤醒等待的线程
    pthread_mutex_unlock(&mutex);

    pthread_join(thread, NULL);
    return 0;
}