05-13-2005
I know you already answered this question, but will there be exactly two or more than two processes communicating between each other? This would affect how the program will work.
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#include <sys/ipc.h>
#include <sys/msg.h>
int main()
{
int qid;
int t;
struct msgbuf mesg;
qid=msgget(IPC_PRIVATE,IPC_CREAT);
mesg.mtype=1L;
mesg.mtext=1;
t=msgsnd(qid,&mesg,1,0);
printf("%d",t);
}
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dispatch(3) BSD Library Functions Manual dispatch(3)
NAME
dispatch -- the dispatch framework
SYNOPSIS
#include <dispatch/dispatch.h>
DESCRIPTION
The dispatch framework allows blocks to be scheduled for asynchronous and concurrent execution via the core functions described in
dispatch_async(3) and dispatch_apply(3).
Dispatch queues are the basic units of organization of blocks. Several queues are created by default, and applications may create additional
queues for their own use. See dispatch_queue_create(3) for more information.
Dispatch groups allow applications to track the progress of blocks submitted to queues and take action when the blocks complete. See
dispatch_group_create(3) for more information.
The dispatch framework also provides functions to monitor underlying system events and automatically submit event handler blocks to dispatch
queues.
SEE ALSO
dispatch_after(3), dispatch_api(3), dispatch_apply(3), dispatch_async(3), dispatch_data_create(3), dispatch_group_create(3),
dispatch_io_create(3), dispatch_io_read(3), dispatch_object(3), dispatch_once(3), dispatch_queue_create(3), dispatch_semaphore_create(3),
dispatch_source_create(3), dispatch_time(3)
Darwin May 1, 2009 Darwin