linux 下 簡單的多線程

linux 下，簡單的多線程應用。

編譯的時候，因爲引用了pthread庫，所以要加-lpthread

 

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>
#include <pthread.h>

pthread_t ntid;

void printids(const char *s)
{
	pid_t pid;
	pthread_t tid;

	pid = getpid(); //get process id
	tid = pthread_self(); //get thread id

	printf("%s pid %lu tid %lu (0x%lx)\n", s, (unsigned long)pid,
			(unsigned long)tid, (unsigned long)tid);
}

void *thr_fn1(void *arg)
{
	printf("thread 1 exiting\n");

	printids("thread1");

	sleep(3);
	pthread_exit((void *)1);
}

void * thr_fn2(void *arg)
{
	printf("thread 2 exiting\n");

	sleep(5);
	pthread_exit((void *)2);
}


int main(void)
{
	int err;
	pthread_t tid1, tid2;
	void *tret;

	/* create thread 1 */
	err = pthread_create(&tid1, NULL, thr_fn1, NULL);
	if (err != 0) {
		printf("can't create thread 1\n");
	}

	/* create thread 2*/
	err = pthread_create(&tid2, NULL, thr_fn2, NULL);
	if (err != 0) {
		printf("can't create thread 2\n");
	}

	/*block until thread1 exit*/
	err = pthread_join(tid1, &tret);
	if (err != 0) {
		printf("can't join with thread 1\n");
	}
	printf("thread 1 exit code %ld\n", (long)tret);

	/*block until thread2 exit*/
	err = pthread_join(tid2, &tret);
	if (err != 0) {
		printf("can't join with thread 1\n");
	}
	printf("thread 2 exit code %ld\n", (long)tret);


	exit(0);
}