命名管道的通讯效率的测试
日期：2014-05-16 浏览次数：20733 次
命名管道的通信效率的测试
write.c
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <limits.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <pthread.h>
#include <time.h>
#define FIFO_NAME "/tmp/my_fifo"
#define BUFFER_SIZE PIPE_BUF //4096
#define TEN_MEG (1024 * 1024 * 1) //决定每次循环传输数据的大小
void* thread_tick(void* arg) //用来测试管道会不会阻塞进程
{
printf("hello, world!\n");
sleep(1);
}
void* thread_write(void* arg)
{
int pipe_fd;
int res;
int bytes_sent = 0;
char buffer[BUFFER_SIZE ];
int count=0; //决定总共循环多少次
if (access(FIFO_NAME, F_OK) == -1) {
res = mkfifo(FIFO_NAME, 0777);
if (res != 0) {
fprintf(stderr, "Could not create fifo %s\n", FIFO_NAME);
exit(EXIT_FAILURE);
}
}
while(count<1){
printf("write: Process %d opening FIFO O_WRONLY\n", getpid());
pipe_fd = open(FIFO_NAME, O_WRONLY);
printf("write: Process %d result %d \n", getpid(), pipe_fd);
if (pipe_fd != -1) {
while(bytes_sent < TEN_MEG) {
res = write(pipe_fd, buffer, BUFFER_SIZE);
if (res == -1) {
fprintf(stderr, "Write error on pipe\n");
exit(EXIT_FAILURE);
}
bytes_sent += res;
}
(void)close(pipe_fd);
}
else {
exit(EXIT_FAILURE);
}
printf("write: Process %d finished , count =%d\n", getpid(),count);
count++;
}
}
int main()
{
pthread_t write;
pthread_t tick;
int resw, rest ;
rest = pthread_create(&tick, NULL, thread_tick, 0);
if(rest != 0)
{
perror("tic
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