main.c

#include <stdio.h>  
#include <stdlib.h>  
#include <sys/time.h>  
#include <time.h>  
#include <sched.h>  
#include <sys/types.h>  
#include <unistd.h>    
  
#define EXEC_COUNT 10000

int main()  
{  
	int x, i, fd[2], p[2];  
	char send    = 'hello';  
	char receive;  
	pipe(fd);  
	pipe(p);  
	struct timeval tv;  
	struct sched_param param;  
	param.sched_priority = 0;  
  
	while ((x = fork()) == -1); 
	if (x==0) {  
		sched_setscheduler(getpid(), SCHED_FIFO, &param);  
		gettimeofday(&tv, NULL);  
		printf("开始测试时间：%u s, %u us\n", tv.tv_sec, tv.tv_usec);  
		for (i = 0; i < EXEC_COUNT; i++) {  
			read(fd[0], &receive, 1);  
			write(p[1], &send, 1);  
		}  
		exit(0);  
	}  
	else {  
		sched_setscheduler(getpid(), SCHED_FIFO, &param);  
		for (i = 0; i < EXEC_COUNT; i++) {  
			write(fd[1], &send, 1);  
			read(p[0], &receive, 1);  
		}  
		gettimeofday(&tv, NULL);  
		printf("结束测试时间：%u s, %u us\n", tv.tv_sec, tv.tv_usec);  
	}  
	return 0;  
}