linux互斥信号量编程

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

sem_t mutex;

void* thread_func(void* arg) {
    sem_wait(&mutex);
    // 访问共享资源
    printf("Thread %ld is accessing the shared resource
", (long)arg);
    sleep(1);
    sem_post(&mutex);
    return NULL;
}

int main() {
    pthread_t threads[5];
    sem_init(&mutex, 0, 1);

    for (long i = 0; i < 5; i++) {
        pthread_create(&threads[i], NULL, thread_func, (void*)i);
    }

    for (int i = 0; i < 5; i++) {
        pthread_join(threads[i], NULL);
    }

    sem_destroy(&mutex);
    return 0;
}