server_sm.c

linux/unix下使用unix域套接字通信与使用共享内存+信号量通信方式的用时测试比较代码。

#include <stdio.h>
#include <sys/time.h>
#include <sys/shm.h>
#include <sys/sem.h>

#define MEM_KEY	99
#define SEM_KEY	9900
#define SEG_SIZE 512
#define BUFF_SIZE 256

int main()
{
	int seg_id;
	int semset_id;
	char *mem_ptr;
	struct sembuf action;

	seg_id = shmget(MEM_KEY,SEG_SIZE,IPC_CREAT|0777);
	if(seg_id==-1)
	{
		printf("shmget error!\n");
		return -1;
	}
	mem_ptr = shmat(seg_id,NULL,0);
	if(mem_ptr == (void*)-1)
	{
		printf("shmat error!\n");
		return -1;
	}
	semset_id = semget(SEM_KEY,1,(0666|IPC_CREAT|IPC_EXCL));
	if(semset_id==-1)
	{
		printf("semget error!\n");
		return -1;
	}
	action.sem_num = 0;
	action.sem_flg = SEM_UNDO;
	action.sem_op = 1;
	
	int usec;	
	int sec;
	int min;
	struct timeval tvBefore;
	struct timeval tvAfter;
	struct timezone tzBefore;
	struct timezone tzAfter;

	unsigned int i = 1;
	char buf[BUFF_SIZE] = {0};
	gettimeofday (&tvBefore, &tzBefore);
	while(i<100000)
	{
		semop(semset_id,&action,1);
		memcpy(buf,mem_ptr,BUFF_SIZE);
		action.sem_op = -1;
		semop(semset_id,&action,1);
		i++;
	}
	gettimeofday (&tvAfter, &tzAfter);
	printf("i = %ld\n",i);
	usec = tvAfter.tv_usec - tvBefore.tv_usec;
	sec = tvAfter.tv_sec - tvBefore.tv_sec;
	min = tzAfter.tz_minuteswest - tzBefore.tz_minuteswest;
	printf("minutes = %d\nseconds = %d\n useconds = %d\n",min,sec,usec);
	shmdt(mem_ptr);
}