Linux下C和C++多线程基础示例POSIX pthread

最新推荐文章于 2025-01-13 00:56:01 发布

conservatism

最新推荐文章于 2025-01-13 00:56:01 发布

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文章标签： c/c++

本文提供了使用GCC和C++创建和管理多线程的示例代码，包括创建线程、参数传递及主线程与子线程间的交互。

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C代码示例：gcc example.c -lpthread;

#include <stdio.h>
#include <pthread.h>
void* thread(int r)
{
    int i;
    for(i=0;i<3;i++)
        printf("This is a pthread %d.\n",r);
}

int main(void)
{
    pthread_t id1;
    pthread_t id2;
    pthread_t id3;
    pthread_t id4;
    int i,ret;
    int one=1;
    int two=2;
    int three=3;
    int four=4;
    ret=pthread_create(&id1,NULL, (void*)thread,one);
    ret=pthread_create(&id1,NULL, (void*)thread,two);
    ret=pthread_create(&id1,NULL, (void*)thread,three);
    ret=pthread_create(&id1,NULL, (void*)thread,four);
    if(ret!=0){
         printf ("Create pthread error!\n");
         return 1;
    }
    for(i=0;i<3;i++)
         printf("This is the main process.\n");
    pthread_join(id1,NULL);
    pthread_join(id2,NULL);
    pthread_join(id3,NULL);
    pthread_join(id4,NULL);
    return 0;
}

C++代码示例：g++ example.cc -lpthread

#include <stdio.h>
#include <pthread.h>
extern "C" void* thread(void * r)
{
    int i;
    for(i=0;i<3;i++)
        printf("This is a pthread %d.\n",*(int*)r);
}

int main(void)
{
    pthread_t id1;
    pthread_t id2;
    pthread_t id3;
    pthread_t id4;
    int i,ret;
    int one=1;
    int two=2;
    int three=3;
    int four=4;
    ret=pthread_create(&id1,NULL, thread,(void*)&one);
    ret=pthread_create(&id1,NULL, thread,(void*)&two);
    ret=pthread_create(&id1,NULL, thread,(void*)&three);
    ret=pthread_create(&id1,NULL, thread,(void*)&four);
    if(ret!=0){
         printf ("Create pthread error!\n");
         return 1;
    }
    for(i=0;i<3;i++)
         printf("This is the main process.\n");
    pthread_join(id1,NULL);
    pthread_join(id2,NULL);
    pthread_join(id3,NULL);
    pthread_join(id4,NULL);
    return 0;
}

注意thread和pthread_create的参数类型转换，以及extern “C”