/*这是一个使用互斥锁实现两个线程之间同步实例，一个线程负责从标准输入设备中读取数据，而另一个线程则负责将读入的数据输出到标准输出设备上*/

#include <stdio.h>

#include <unistd.h>

#include <stdlib.h>

#include <pthread.h>

#include <semaphore.h>

#include <string.h>

void *thread_function(void *arg);

pthread_mutex_t work_mutex; //全局互斥锁对象，首先应该定义一个这样的互斥锁

#define WORK_SIZE 1024 //全局共享数据去

char work_area[WORK_SIZE];

int time_to_exit = 0;

int main(int argc,char *argv[])

{

int res;

pthread_t a_thread;

void *thread_result;

res = pthread_mutex_init(&work_mutex, NULL); //init mutex 初始化互斥锁

if (res != 0)

{

perror("Mutex initialization failed");

exit(EXIT_FAILURE);

}

res = pthread_create(&a_thread, NULL, thread_function, NULL);//create new thread创建新线程

if (res != 0)

{

perror("Thread creation failed");

exit(EXIT_FAILURE);

}

pthread_mutex_lock(&work_mutex); //lock the mutex 互斥锁上锁

printf("Input some text. Enter 'end' to finish\n");

while(!time_to_exit) //标志

{

fgets(work_area, WORK_SIZE, stdin); //get a string from stdin读取一行信息 pthread_mutex_unlock(&work_mutex); //unlock the mutex解锁

while(1)

{

pthread_mutex_lock(&work_mutex); //lock the mutex