message queue and signal notifiers

[davidcollins001]

Hi,

I am trying to implement a blocked or synchronous method of message passing using signal interrupts. So far I have the following:

server.c
{
msgget(queue)
msgrcv (queue mtype)

while(data to send) {
msgsnd(data)
kill(client, SIGUSR1)
}

close queue
}

client.c
{
sigaction(catch SIGUSR1)
msgget(queue)
msgsnd(queue mtype)

while(data to read) {
pause()
printf(dadta)
}
}

The way I can think of doing this is using sa_handler to call a function that reads from the queue when the signal is received. I feel like this isn't the best way to do it since I would have to globally define the structure that gets the data, along with the message queue id returned from msgget too.

I am trying to learn how to use signals better and I would like some pointers on how to do this, or ideas that I can try.

Thanks

[gpraghuram]

Hi,

I am trying to implement a blocked or synchronous method of message passing using signal interrupts. So far I have the following:

server.c
{
msgget(queue)
msgrcv (queue mtype)

while(data to send) {
msgsnd(data)
kill(client, SIGUSR1)
}

close queue
}

client.c
{
sigaction(catch SIGUSR1)
msgget(queue)
msgsnd(queue mtype)

while(data to read) {
pause()
printf(dadta)
}
}

The way I can think of doing this is using sa_handler to call a function that reads from the queue when the signal is received. I feel like this isn't the best way to do it since I would have to globally define the structure that gets the data, along with the message queue id returned from msgget too.

I am trying to learn how to use signals better and I would like some pointers on how to do this, or ideas that I can try.

Thanks

I would use semaphore or a mutex to accompilish this instead of a signal.
Your idea is good but You will have better control when u use the one which i specified.

Raghuram