threadFinishBySem.c

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

sem_t *sem[10];

void *run(void *param){
	int *tmp = (int *)malloc(sizeof(int));
	*tmp = *((int *)param);
	sem_wait(sem[*tmp]);	
	pthread_exit(tmp);
	return NULL;
}
int main(){
	pthread_t tid[10];
	int tag[10] = {0,1,2,3,4,5,6,7,8,9};
	int i;
	for(i=0;i<10;i++){
		char str[3] = {0};
		str[0] = i+'0';
		sem[i] = sem_open(str, O_CREAT, 0777);
	}
	for(i=0;i<10;i++){
		pthread_create(&tid[i],NULL,run, &tag[i]);
		printf("create tid %d.\n",i);
	}
	for(i=0;i<10;i++){
		sem_post(sem[i]);
	}
	for(i=0;i<10;i++){
		int *ret;
		pthread_join(tid[i],&ret);
		sem_close(sem[i]);
		printf("tid %d finished.\n",*ret);
		free(ret);
	}
	return 0;
}
/*
create tid 0.
create tid 1.
create tid 2.
create tid 3.
create tid 4.
create tid 5.
create tid 6.
create tid 7.
create tid 8.
create tid 9.
tid 0 finished.
tid 1 finished.
tid 2 finished.
tid 3 finished.
tid 4 finished.
tid 5 finished.
tid 6 finished.
tid 7 finished.
tid 8 finished.
tid 9 finished. 
 */