pthread.c

This a pthread program code which is compiled under the linux. Someone who want to test the pthread

// 951417 孫健銘 HW2
#include<pthread.h>/*create thread*/
#include<stdio.h>
#include<sys/types.h>//取得Pid
#include<unistd.h>//建立行程
#include<stdlib.h>
#include<sys/wait.h>

void *func(void *temp)
{
	char *ptr = (char *)temp;
	printf("This is : %s\n", ptr);
/**********************************************************************************************/
			//結合hw1 Pid

       pid_t pid;//建立行程id變數

	 printf("Process        Process's id           Round\n");

       pid = fork();//建立子行程


	 if(pid > 0)//父行程
      	  {

		printf("Parent 		    %d  		   %d\n",getpid(),1);
            sleep(2);	   	
		wait(NULL);//在此等待 等程式全部結束後才跳離視窗
             // exit(-1);
      	  }

       else if(pid==0)//子行程
      	  {
            printf("Child     	    %d	      %d\n",getpid(),1);
            sleep(3);//休息3秒
      	  }

	 else  if(pid < 0)//fork 失敗
      	  {
          printf("fork is not success");
          exit(-1);
      	  }
/**********************************************************************************************/
}

int main()
{
	pthread_t thread1,thread2;/*宣告型態*/
	char *message1 = "Thread 1";
	char *message2 = "Thread 2";
	/**************************************************************/
	//pthread_create
	/*&thread 儲存Thread的代碼*/
	/*NULL代表預設 pthread_attr_t*/
	/*函式指標*/
	/*傳入參數為(char*)型態須先轉成(void*)型態,以完成messge被強制轉型的動作*/
	/**************************************************************/
	//pthread_join
	/*使Thread等待其他Thread結束之後才可以繼續執*/
	/**************************************************************/
	pthread_create(&thread1,NULL,func,(void*) message1);
	pthread_create(&thread2,NULL,func,(void*) message2);		
	pthread_join(thread1,NULL);
	pthread_join(thread2,NULL);
return 0;
}