读写锁实现读写者问题

注意：LINUX 读写锁是写者优先

/*producer and constmer*/#include<stdio.h>#include<pthread.h>#include<string.h>#include<stdlib.h>pthread_rwlock_t rwlock;int good = 0;void *writer(void *argv){while(1){pthread_rwlock_wrlock(&rwlock);good = rand() % 1000;printf("%u witre:%d\n",(unsigned int)pthread_self() % 100,good);pthread_rwlock_unlock(&rwlock);sleep(rand()%2);}return NULL;}void *reader(void *argv){while(1){pthread_rwlock_rdlock(&rwlock);printf("%u read:%d\n",(unsigned int)pthread_self() % 100,good);pthread_rwlock_unlock(&rwlock);sleep(rand()%2);}return NULL;}void main(){pthread_t pt[8];int i;pthread_rwlock_init(&rwlock,NULL);for(i=0;i < 3;i++){pthread_create(&pt[i],NULL,writer,NULL);}for(;i<8;i++)pthread_create(&pt[i],NULL,reader,NULL);for(i=0;i<8;i++)pthread_join(pt[i],NULL);pthread_rwlock_destroy(&rwlock);}