如何在Linux C上同步两个线程？

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

pthread_mutex_t mutex;
pthread_cond_t cond;
int sharedData = 0;

void* thread1(void* arg) {
    pthread_mutex_lock(&mutex);
    while (sharedData < 10) {
        // 等待条件变量满足
        pthread_cond_wait(&cond, &mutex);
    }
    printf("Thread 1: sharedData = %d\n", sharedData);
    pthread_mutex_unlock(&mutex);
    pthread_exit(NULL);
}

void* thread2(void* arg) {
    pthread_mutex_lock(&mutex);
    sharedData = 10;
    // 发送信号通知等待的线程条件已满足
    pthread_cond_signal(&cond);
    pthread_mutex_unlock(&mutex);
    pthread_exit(NULL);
}

int main() {
    pthread_t t1, t2;
    pthread_mutex_init(&mutex, NULL);
    pthread_cond_init(&cond, NULL);

    pthread_create(&t1, NULL, thread1, NULL);
    pthread_create(&t2, NULL, thread2, NULL);

    pthread_join(t1, NULL);
    pthread_join(t2, NULL);

    pthread_mutex_destroy(&mutex);
    pthread_cond_destroy(&cond);

    return 0;
}