sem.c

来自「linux下的多线程调试工具」· C语言 代码 · 共 42 行

#define _XOPEN_SOURCE 600

#include <pthread.h>
#include <semaphore.h>
#include <stdio.h>
#include <time.h>
#include <fcntl.h>
#include "alias.h"

struct timespec wait = {0, 30000000};
struct timespec rem;
#define WAIT nanosleep (&wait, &rem)

sem_t sem;
FILE *fd;

void *func () {
    new_thread_alias (fd, "func");
    sem_trywait (&sem);
    sem_wait (&sem);
    sem_post (&sem);
    sem_trywait (&sem);
}

int main () {
    pthread_t thread;

    fd = alias_init ("alias");
    new_thread_alias (fd, "main");
    new_object_alias (fd, &sem, "sem");

    sem_init (&sem, 0, 0);
    pthread_create (&thread, NULL, func, NULL);
    WAIT;
    sem_post (&sem);
    pthread_join (thread, NULL);
    sem_destroy (&sem);

    return 0;
}