linuc c 代码示例

 

fork的应用：

#include "stdio.h"

#include "string.h"

#include <sys/types.h>

#include <sys/stat.h>

#include <fcntl.h>

 

#include <unistd.h>



#define Max(a,b) ({int a1=a,b1=b; a1>b1?a1:b1;})



int main()

{



    int i,j,k,*q;

    char *p="abc";

    int pids[10];

    int pid;



    q=pids;



    //printf("%d \n", getpid());

    //sleep (3);



for(i=0;i<3;i++)

{



    printf("for-%d\n",i);

    pid=fork();

    if(pid) {

        *(q++) = pid;    

    }else if(pid == 0){

        sleep(5);

        printf("child:%d \n", getpid());

        break;

    }

}

    if(pid>0)

    {

        for(i=0;i<3;i++)

        {

        //    waitpid(pids[i], NULL, 0);    

            printf("parent: %d, %d \n", getpid(),pids[i]);



        }

    }

    printf("song \n");



}

没有waitpid时输出：

有waitpid时：

 

 

pthread_create 函数示例：

#include "stdio.h"

#include "string.h"

#include "pthread.h"



void *thr_fn(void *arg)

{



sleep(15);

    printf("sub :%d \n", pthread_self());

    return NULL;

}



int main()

{

    pthread_t err;

    pthread_t ntid;



    err = pthread_create(&ntid, NULL, thr_fn, NULL);

    if (err != 0)

        printf("can't create thread: %s\n", strerror(err));

    //pthread_join(ntid,NULL);



    printf("main :%d \n", pthread_self());

sleep(16);

    return 0;





}