第四章Linux多线程简单Demo

#include <stdio.h>#include <stdlib.h>#include <unistd.h>#include <string.h>#include <pthread.h>#include <semaphore.h>#define  N  64char buf[N];sem_t sem_r;sem_t sem_w;void *thread_function(void *arg);int main(){pthread_t a_thread;sem_init(&sem_r, 0, 0);sem_init(&sem_w, 0, 1);if (pthread_create(&a_thread, NULL, thread_function, NULL) < 0){perror("fail to pthread_create");exit(-1);}while ( 1 ){sem_wait(&sem_w);printf("input : ");fgets(buf, N, stdin);if (strcmp(buf, "quit\n") == 0) break;sem_post(&sem_r);}return 0;}void *thread_function(void *arg){while ( 1 ){sem_wait(&sem_r);printf("read from buf : %s", buf);sem_post(&sem_w);}}