gcc pthread_create()方法使用

最新推荐文章于 2023-06-24 15:46:50 发布

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本文通过两个示例展示了如何在C语言中使用POSIX线程库(pthread)进行线程的创建及数据传递，并演示了主线程如何等待子线程完成。第一个示例展示了如何将数据传递给子线程并打印；第二个示例则进一步展示了子线程如何再次创建子线程。

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#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <pthread.h>


pthread_t child_thread;

pthread_t child_thread2;
typedef struct{
    int pass_data1;
    int pass_data2;
}PassDataGroup;

void *child_function(void *arg)
{
    PassDataGroup *pass = (PassDataGroup *)arg;

    printf("this is a child thread. \n");
    if(!pass){
        printf(" no data passed , I do not need to do anything \n ");
        return NULL;
    }
    printf("this is a child thread. your first passed data is := %d \n", pass->pass_data1);
    printf("this is a child thread. your second passed data is := %d \n", pass->pass_data2);

    return NULL;
}


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



    PassDataGroup *pass = (PassDataGroup *)malloc(sizeof(PassDataGroup));
    memset(pass, 0, sizeof(PassDataGroup));
    pass->pass_data1=1;
    pass->pass_data2=2;

    pthread_create(&child_thread, NULL, child_function, pass);

        //no data pass
        //pthread_create(&child_thread, NULL, child_function, NULL);

    sleep(3);


    return 0;
}

需要注意的是，我们的main线程一定要等到子线程退出后再退出。因为main退出时会终止线程，这样我们的子线程也会停止。

当然，这个等待只限于主线程操作，我们是子线程再次创建子线程，则不用考虑这个结果。

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <pthread.h>


pthread_t child_thread;

pthread_t child_thread2;
typedef struct{
    int pass_data1;
    int pass_data2;
}PassDataGroup;

void *child_function2(void *arg)
{

    printf("this is a child thread--------------. \n");
    sleep(3);
    printf("this is a child thread. -----------------  \n");



    return NULL;
}


void *child_function(void *arg)
{
    PassDataGroup *pass = (PassDataGroup *)arg;

    printf("this is a child thread. \n");
    if(!pass){
        printf(" no data passed , I do not need to do anything \n ");
        return NULL;
    }
    printf("this is a child thread. your first passed data is := %d \n", pass->pass_data1);
    printf("this is a child thread. your second passed data is := %d \n", pass->pass_data2);

    pthread_create(&child_thread2, NULL, child_function2, NULL);
    printf("this is a child thread.  I'm exiting \n");
    return NULL;
}

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



    PassDataGroup *pass = (PassDataGroup *)malloc(sizeof(PassDataGroup));
    memset(pass, 0, sizeof(PassDataGroup));
    pass->pass_data1=1;
    pass->pass_data2=2;

    pthread_create(&child_thread, NULL, child_function, pass);

        //no data pass
        //pthread_create(&child_thread, NULL, child_function, NULL);

    sleep(5);


    return 0;
}

代码可以潇洒运行，结果：

./pthread_create
this is a child thread.
this is a child thread. your first passed data is := 1
this is a child thread. your second passed data is := 2
this is a child thread.  I'm exiting
this is a child thread--------------.
this is a child thread. -----------------