I'm writing to message queue
if (msgsnd(q, &msg, sizeof(message), slaves_list[to]) == -1)
and reading
if (msgrcv(q, &msg, sizeof(message), id, 0) == -1)
but what if this queue is empty? How to check that? If there is nothing I want execute next instruction in the loop
Use IPC_NOWAIT
. From the documentation:
If
(msgflg & IPC_NOWAIT)
is non-zero, the calling thread will return immediately with a return value of-1
and errno set to[ENOMSG]
.
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