testsleep.cpp

在Linux测试sleep函数是否对其它进程阻塞

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>
#include <fcntl.h>
#include <termios.h>
#include <unistd.h>
#include <sys/io.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <sys/file.h>
#include <pthread.h>
#include <semaphore.h>
#include <sys/ioctl.h>



/*********************** main ***********************************/
int main(void)
{
	int j=0;
	pid_t pid;

	j++;
	printf("======== Time=%ld,PID=%d,Main process j=%d =====\n",time(NULL),getpid(),j);

//======================= First Create process...Ready ==============================
	//Process 1
	pid=fork();
	if(pid==0){
		printf("...... Time=%ld,PID=%d,Process 1# is Running j=%d ......\n",time(NULL),getpid(),j);
		sleep(5);
		printf("------- Time=%ld,PID=%d,Process 1# Exit j=%d-------\n",time(NULL),getpid(),j);
		exit(1);
	}
	else if(pid==-1){
		printf("...... fork() process 1# error......\n");
		return -1;
	}

	//process 2
	pid=fork();
	if (pid==0){
		printf("------- Time=%ld,PID=%d,Process 2# Exit j=%d-------\n",time(NULL),getpid(),j);
		sleep(15);
		exit(1);
	}else if (pid==-1){
		printf("...... forking process 2# error ......\n");
		return -1;
	}

	//process 3
	pid=fork();
	if (pid==0){
		printf("------- Time=%ld,PID=%d,Process 3# Exit j=%d-------\n",time(NULL),getpid(),j);
		sleep(25);
		exit(1);
	}else if (pid==-1){
		printf("...... forking process 3# error ......\n");
		return -1;
	}

	waitpid(pid,NULL,0);
	return 0;
}