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Message Queues Example

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Article
Keywords: RMessageQueue
Created: spark55 (01 Oct 2007)
Last edited: hamishwillee (03 Feb 2012)
How to communicate between two threads or processes (Message Queues Description)


The following code shows the message queues usage (follows the steps involved in the above link):

#include <sys/msg.h>
#include <stdlib.h>
#include <string.h>
#include <pthread.h>
 
#define MSG_KEY 1000
pthread_t threadid;
 
void* MsgDSndThread(void* arg)
{
struct msgbuf *snd = malloc(16);
key_t fd;
snd->mtype = 1;
strcpy(snd->mtext, "message");
fd = msgget(MSG_KEY, IPC_CREAT);
msgsnd(fd, snd, 12, 0);
free(snd);
return 0;
}
 
void CreateThreadL()
{
pthread_create(&threadid,(pthread_attr_t *)NULL,MsgDSndThread, NULL);
}
 
int main()
{
struct msgbuf *rcv = malloc(16);
key_t fd = msgget(MSG_KEY, IPC_CREAT);
CreateThreadL();
msgrcv(fd, rcv, 6, 0, 0);
msgctl(fd, IPC_RMID, NULL);
free(rcv);
return 0;
}
This page was last modified on 3 February 2012, at 09:10.
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