Linux下C语言多线程实例

最新推荐文章于 2022-03-30 18:01:54 发布

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#多线程 #thread #linux #语言 #c #null

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本文展示了一个使用C语言实现的多线程程序，该程序演示了如何在两个线程中安全地访问并加1一个共享变量，通过互斥锁确保数据的一致性和线程间的正确同步。

创建两个线程访问互斥数据，对其加1输出。这是一个多线程最常见的例子：

#include <pthread.h>
#include <stdio.h>
#include <sys/time.h>
#include <string.h>
#define MAX 10
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 < MAX; i++)
{
printf("thread1 : number = %d\n",number);

pthread_mutex_lock(&mut);
number++;
pthread_mutex_unlock(&mut);

sleep(2);
}

printf("thread1 :The main is waiting for me ?\n");
pthread_exit(NULL);
}

void *thread2()
{
printf("thread2 : I'm thread 2\n");
for (i = 0; i < MAX; i++)
{
printf("thread2 : number = %d\n",number);

pthread_mutex_lock(&mut);
number++;
pthread_mutex_unlock(&mut);
sleep(3);
}

printf("thread2 :The main is waiting for me ?\n");
pthread_exit(NULL);
}

void thread_create(void)
{
int temp;
memset(&thread, 0, sizeof(thread));
if((temp = pthread_create(&thread[0], NULL, thread1, NULL)) != 0)

{

printf("The thread1 create fail !\n");
}

else

{
printf("The thread1 create success !\n");

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

printf("The thread2 create fail !\n");
}

else
{

printf("The thread2 create success !\n");
}

}

void thread_wait(void)
{
if(thread[0] !=0)
{
pthread_join(thread[0],NULL);
printf("The thread1 is end !\n");
}
if(thread[1] !=0)
{
pthread_join(thread[1],NULL);
printf("The thread2 is end !\n");
}
}

int main()
{
pthread_mutex_init(&mut,NULL);
printf("I am the main thread ,I am creating thread .\n");
thread_create();
printf("I am the main thread ,I am waiting for the end of the thread.\n");
thread_wait();
return 0;
}

编译：

gcc -o example -lpthread example.c

运行：

./example

输出结果：

I am the main thread ,I am creating thread .
thread1 : I'm thread 1
thread1 : number = 0
The thread1 create success !
thread2 : I'm thread 2
thread2 : number = 1
The thread2 create success !
I am the main thread ,I am waiting for the end of the thread.
thread1 : number = 2
thread2 : number = 3
thread1 : number = 4
thread2 : number = 5
thread1 : number = 6
thread1 : number = 7
thread2 : number = 8
thread1 : number = 9
thread2 : number = 10
thread1 :The main is waiting for me ?
The thread1 is end !
thread2 :The main is waiting for me ?
The thread2 is end !