fork的应用：

#include "stdio.h"#include "string.h"#include 
     
      #include 
      
       #include 
       
         #include 
        
         #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;}