生产者消费者问题:条件变量实现和信号量实现
作者:互联网
条件变量实现:记一次由虚假唤醒产生的bug
信号量实现:
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <pthread.h>
#include <semaphore.h>
sem_t empty, full;
void *produce(void *s)
{
while(1)
{
usleep(100000);
sem_wait(&empty);
int a = 0;
sem_getvalue(&full, &a);
printf("%s生产后有%d个产品\n",(char*)s, a+1);
sem_post(&full);
}
return NULL;
}
void *consume(void *s)
{
usleep(200000);
while(1)
{
usleep(100000);
sem_wait(&full);
int a = 0;
sem_getvalue(&full, &a);
printf("%s消费后有%d个产品\n",(char*)s, a);
sem_post(&empty);
}
return NULL;
}
int main() {
{//初始化
pthread_t p1, p2, p3, c1, c2, c3;
sem_init(&empty, 0, 10);
sem_init(&full, 0, 0);
pthread_create(&p1, NULL, produce, "生产者一");
pthread_create(&p2, NULL, produce, "生产者二");
pthread_create(&p3, NULL, produce, "生产者三");
pthread_create(&c1, NULL, consume, "消费者一");
pthread_create(&c2, NULL, consume, "消费者二");
pthread_create(&c3, NULL, consume, "消费者三");
pthread_detach(p1);
pthread_detach(p2);
pthread_detach(p3);
pthread_detach(c1);
pthread_detach(c2);
pthread_detach(c3);
}
sleep(3);
sem_destroy(&empty);
sem_destroy(&full);
return 0;
}
标签:include,实现,create,信号量,生产者,full,pthread,sem,NULL 来源: https://www.cnblogs.com/rookiezjz/p/15831099.html