简单的，通过线程实现三人卖票系统。

#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:%dn",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:%dn",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:%dn",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("%dn",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;

}

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