一个简单的互斥锁的例子

/*thread_example.c :  c multiple thread programming in linux

*/

#include<stdio.h>

#include<stdlib.h>

#include<pthread.h>

#include<memory.h>

#define MAX1 10

#define MAX2 30

pthread_t thread[2];

pthread_mutex_t mut;

int number=0, i;

void *thread1()

{

printf ("thread1 : I'm thread 1\n");

for (i = 0; i < MAX1; i++)

{

printf("thread1 : number = %d  i=%d\n",number,i);

pthread_mutex_lock(&mut);

number++;

pthread_mutex_unlock(&mut);

sleep(2);

}

printf("thread1 :Is main function waiting for me acomplishing task? \n");

pthread_exit(NULL);

}

void *thread2()

{

printf("thread2 : I'm thread 2\n");

for (i = 0; i < MAX2; i++)

{

printf("thread2 : number = %d  i=%d\n",number,i);

pthread_mutex_lock(&mut);

number++;

pthread_mutex_unlock(&mut);

sleep(3);

}

printf("thread2 :Is main function waiting for me  to acomplish task ?\n");

pthread_exit(NULL);

}

void thread_create(void)

{

int temp;

memset(&thread, 0, sizeof(thread));          //comment1

/*创建线程*/

if((temp = pthread_create(&thread[0], NULL, thread1, NULL)) != 0)       //comment2

printf("线程1创建失败!\n");

else

printf("Thread 1 is established\n");

if((temp = pthread_create(&thread[1], NULL, thread2, NULL)) != 0)  //comment3

printf("线程2创建失败");

else

printf("Thread 2 is established\n");

}

void thread_wait(void)

{

/*等待线程结束*/

if(thread[0] !=0) {                   //comment4

pthread_join(thread[0],NULL);

printf("Thread 1 is over \n");

}

if(thread[1] !=0) {                //comment5

pthread_join(thread[1],NULL);

printf("Thread 2 is over\n");

}

}

int main()

{

/*用默认属性初始化互斥锁*/

pthread_mutex_init(&mut,NULL);

printf("I am the main funtion,and I am establishing threads. Ha-ha\n");

thread_create();

printf("I am the main funtion,and I am waiting for thread to accomplish task. Ha-ha\n");

thread_wait();

return 0;

}