线程实例 3人卖票

#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
//#include <unistd.h>
//#include <errno.h>
#include <time.h>


pthread_mutex_t mutex;
pthread_cond_t cond1;
pthread_cond_t cond2;
pthread_cond_t cond3;


int ticket = 10;


void *sell_ticket1(void)
{
    while(1)
{
pthread_mutex_lock(&mutex);
pthread_cond_wait(&cond1,&mutex);
if(ticket > 0)
{
printf("sell ticket1--> chool ticket:%d\n",ticket--);
//sleep(1);
pthread_mutex_unlock(&mutex);
}
else
{
pthread_mutex_unlock(&mutex);
break;
}
}
return NULL;
}


void *sell_ticket2(void)
{
while(1)
{
pthread_mutex_lock(&mutex);
pthread_cond_wait(&cond2,&mutex);
if(ticket > 0)
{
//sleep(1);
printf("sell ticket2--> chool ticket:%d\n",ticket--);
//sleep(1);
pthread_mutex_unlock(&mutex);
}
else
{
pthread_mutex_unlock(&mutex);
break;
}
}
}


void *sell_ticket3(void)
{
while(1)
{
pthread_mutex_lock(&mutex);
pthread_cond_wait(&cond3,&mutex);
if(ticket > 0)
{
//sleep(1);
printf("sell ticket3--> chool ticket:%d\n",ticket--);
//sleep(1);
pthread_mutex_unlock(&mutex);
}
else
{
pthread_mutex_unlock(&mutex);
break;
}
}
return NULL;
}


int main()
{
    int i=0,flog=0,ret=0;
    pthread_t id1,id2,id3;
int old_ticket = ticket;


srand(time(NULL));
pthread_mutex_init(&mutex,NULL);
pthread_cond_init(&cond1,NULL);
pthread_cond_init(&cond2,NULL);
pthread_cond_init(&cond3,NULL);


    ret = pthread_create(&id1, NULL, (void*)sell_ticket1, NULL);
if(ret == -1)
{
printf("create_thread1 error!\n");
exit(-1);
}
ret = pthread_create(&id2, NULL, (void*)sell_ticket2, NULL);
if(ret == -1)
{
printf("create_thread2 error!\n");
exit(-1);
}
    ret = pthread_create(&id3, NULL, (void*)sell_ticket3, NULL);
if(ret == -1)
{
printf("create_thread3 error!\n");
exit(-1);
}


sleep(1);
for(i =0; i< old_ticket; i++)
{
flog = rand() % 3;
//printf("%d\n",flog);
switch(flog)
{
case 0: pthread_cond_signal(&cond1);break;
case 1: pthread_cond_signal(&cond2);break;
case 2: pthread_cond_signal(&cond3);break;
}
sleep(1);
}
pthread_cond_signal(&cond1);
sleep(1);
pthread_cond_signal(&cond2);
sleep(1);
pthread_cond_signal(&cond3);
sleep(1);
    ret = pthread_join(id1, NULL);
if(ret == -1)
{
printf("join_thread1 error!\n");
exit(-1);
}
printf("id1 exit!\n");
    ret = pthread_join(id2, NULL);
if(ret == -1)
{
printf("join_thread2 error!\n");
exit(-1);
}
printf("id2 exit!\n");
    ret = pthread_join(id3, NULL);
if(ret == -1)
{
printf("join_thread3 error!\n");
exit(-1);
}
printf("id3 exit!\n");
    
    return 0;
}