消息队列应用
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client.c
#include <sys/msg.h>
#include <sys/types.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <stdio.h>
#include <sys/errno.h>
#include<string.h>
#include<time.h>
#include<stdlib.h>
struct mymsgbuf
long mtype;
float num_data[10];
;
int main(int argc, char *argv[])
struct mymsgbuf buf;
int msgid;
int i;
if((msgid = msgget(0x1234, 0666|IPC_CREAT)) < 0)
fprintf(stderr, "open msg %x failed.\\n", 0x1234);
return 0;
memset(&buf, 0, sizeof(buf));
buf.mtype = atoi(argv[1]);
srand(atoi(argv[1]) + time(NULL));
for(i=0; i < 10; i++)
buf.num_data[i] = 0+1.0*(rand()%RAND_MAX)/RAND_MAX *(1-0);
msgsnd(msgid, &buf, sizeof(buf.num_data),0);
usleep(400000);
msgrcv(msgid, &buf, sizeof(buf.num_data), buf.mtype, 0);
printf("average is %f\\n", buf.num_data[0]);
return 0;
server.c
#include <sys/msg.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <stdio.h>
#include <signal.h>
#include <sys/errno.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <pthread.h>
#define MSG_NUM 4
extern int errno;
int msgid;
struct mymsgbuf
long mtype;
float num_data[10];
;
void close_fun(int signo)
if(SIGINT == signo)
msgctl(msgid,IPC_RMID,NULL);
exit(0);
float col_num_avr(float *arr, int num)
int i=0;
float tmp = 0.0;
for(i=0; i < num; i++)
printf("%f ", arr[i]);
tmp += arr[i];
printf("\\n");
return tmp/num;
void *deal_num_data(void *arg)
struct mymsgbuf *msg = (struct mymsgbuf *)arg;
struct mymsgbuf buf;
float avr = col_num_avr(msg->num_data, 10);
buf.num_data[0] = avr;
buf.mtype = msg->mtype;
msgsnd(msgid, &buf, sizeof(buf.num_data),0);
return NULL;
int main()
struct mymsgbuf *buf[MSG_NUM];
int i;
signal(SIGINT, close_fun);
for(i=0; i < MSG_NUM; i++)
buf[i] = malloc(MSG_NUM * sizeof(struct mymsgbuf));
int ret;
pthread_t pid;
if((msgid = msgget(0x1234, 0666|IPC_CREAT)) < 0)
fprintf(stderr, "open msg %X failed.\\n", 0x1234);
return 0;
for(i=0; i < MSG_NUM; i++)
buf[i]->mtype=i+1;
msgrcv(msgid, buf[i], sizeof(buf[i]->num_data), buf[i]->mtype, 0);
pthread_create(&pid, NULL, deal_num_data, buf[i]);
usleep(100000);
return 0;
两个程序,客户端生成随机10个float数,然后服务端接受,并返回给client平均值,
执行
./server
seq 1 4 | xargs -P 0 -n 1 ./client
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