火车售票

分别用互斥锁、条件变量、信号灯；用到线程

火车售票-互斥锁

#include<stdio.h>
#include<pthread.h>pthread_mutex_t mutex;
int ticketCount = 20;void *saleWindow1(void *args)
{while(1){pthread_mutex_lock(&mutex);if(ticketCount != 0){printf("Salewindow1 start sale tickets! The number of tickets is %d\n", ticketCount);sleep(2);   // 2秒卖一张票--ticketCount;printf("Salewindow1 sale tickets finish! The number of tickets is %d\n", ticketCount);}else{printf("Ticket is over!\n");pthread_mutex_unlock(&mutex);pthread_exit(NULL);}pthread_mutex_unlock(&mutex);sleep(1);}
}void *saleWindow2(void *args)
{while(1){pthread_mutex_lock(&mutex);if(ticketCount != 0){printf("Salewindow2 start sale tickets! The number of tickets is %d\n", ticketCount);sleep(2);--ticketCount;printf("Salewindow2 sale tickets finish! The number of ticket is %d\n", ticketCount);}else{printf("Ticket is over!\n");pthread_mutex_unlock(&mutex);pthread_exit(NULL);}pthread_mutex_unlock(&mutex);sleep(1);}
}int main(void)
{pthread_t pthid1 = 0, pthid2 = 0;pthread_mutex_init(&mutex, NULL);pthread_create(&pthid1, NULL, saleWindow1, NULL);pthread_create(&pthid2, NULL, saleWindow2, NULL);pthread_join(pthid1, NULL);pthread_join(pthid2, NULL);pthread_mutex_destroy(&mutex);return 0;
}

火车售票2-条件变量

售票售完后通过条件变量重设车票数量，然后继续卖票

#include<stdio.h>
#include<pthread.h>pthread_mutex_t mutex;
pthread_cond_t cond;
int ticketCount = 3;void *setTicket(void *arg)
{pthread_mutex_lock(&mutex);if(ticketCount != 0)pthread_cond_wait(&cond, &mutex);ticketCount = 3;pthread_mutex_unlock(&mutex);pthread_exit(NULL);
}void *saleWindow1(void *arg)
{while(1){pthread_mutex_lock(&mutex);if(ticketCount != 0){printf("Salewindow1 start sale tickets! The number of tickets is %d\n", ticketCount);sleep(2);   // 2秒卖一张票--ticketCount;printf("Salewindow1 sale tickets finish! The number of tickets is %d\n", ticketCount);if(ticketCount == 0)pthread_cond_signal(&cond);}else{printf("Ticket is over!\n");pthread_mutex_unlock(&mutex);pthread_exit(NULL);}pthread_mutex_unlock(&mutex);sleep(1);}
}void *saleWindow2(void *arg)
{while(1){pthread_mutex_lock(&mutex);if(ticketCount != 0){printf("Salewindow2 start sale tickets! The number of tickets is %d\n", ticketCount);sleep(2);--ticketCount;printf("Salewindow2 sale tickets finish! The number of ticket is %d\n", ticketCount);if(ticketCount == 0)pthread_cond_signal(&cond);}else{printf("Ticket is over!\n");pthread_mutex_unlock(&mutex);pthread_exit(NULL);}pthread_mutex_unlock(&mutex);sleep(1);}
}int main(void)
{pthread_t pthid1 = 0, pthid2 = 0, pthid3 = 0;pthread_mutex_init(&mutex, NULL);pthread_cond_init(&cond, NULL);pthread_create(&pthid3, NULL, setTicket, NULL);pthread_create(&pthid1, NULL, saleWindow1, NULL);pthread_create(&pthid2, NULL, saleWindow2, NULL);pthread_join(pthid1, NULL);pthread_join(pthid2, NULL);pthread_join(pthid3, NULL);pthread_mutex_destroy(&mutex);pthread_cond_destroy(&cond);return 0;
}

火车售票3-信号灯

当信号灯灯值为1时，类似于互斥锁

#include<stdio.h>
#include<pthread.h>
#include<semaphore.h>int ticketCount = 10;
sem_t lock;void *saleWindow1(void *arg)
{while(1){sem_wait(&lock);if(ticketCount != 0){printf("SaleWindow1 sale ticket begin! The number of tickets is %d\n", ticketCount);sleep(2);--ticketCount;printf("SaleWindow1 sale ticket finish! The number of tickets is %d\n", ticketCount);}else{sem_post(&lock);printf("Ticket is over!\n");pthread_exit(NULL);}sem_post(&lock);sleep(1);}
}void *saleWindow2(void *arg)
{while(1){sem_wait(&lock);if(ticketCount != 0){printf("SaleWindow2 sale ticket begin! The number of tickets is %d\n", ticketCount);sleep(2);--ticketCount;printf("SaleWindow2 sale ticket finish! The number of ticket is %d\n", ticketCount);}else{sem_post(&lock);printf("Ticket is over!\n");pthread_exit(NULL);}sem_post(&lock);sleep(1);}
}int main(void)
{pthread_t pthid1, pthid2;sem_init(&lock, 0, 1);pthread_create(&pthid1, NULL, saleWindow1, NULL);pthread_create(&pthid2, NULL, saleWindow2, NULL);pthread_join(pthid1, NULL);pthread_join(pthid2, NULL);sem_destroy(&lock);return 0;
}

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火车售票-线程3种实现

火车售票

火车售票-互斥锁

火车售票2-条件变量

火车售票3-信号灯

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