Signal(3pm)
NAME
Coro::Signal - thread signals (binary semaphores)
SYNOPSIS
use Coro::Signal; $sig = new Coro::Signal; $sig->wait; # wait for signal # ... some other "thread" $sig->send;
DESCRIPTION
This module implements signals/binary semaphores/condition variables
(basically all the same thing). You can wait for a signal to occur or
send it, in which case it will wake up one waiter, or it can be
broadcast, waking up all waiters.
It is recommended not to mix "send" and "broadcast" calls on the same
"Coro::Signal" - it should work as documented, but it can easily
confuse you :->
- $sig = new Coro::Signal;
- Create a new signal.
- $sig->wait
- Wait for the signal to occur (via either "send" or "broadcast").
Returns immediately if the signal has been sent before. - $sem->wait ($callback)
- If you pass a callback argument to "wait", it will not wait, but
immediately return. The callback will be called under the same
conditions as "wait" without arguments would continue the thrad. - The callback might wake up any number of threads, but is NOT allowed to block (switch to other threads).
- $sig->send
- Send the signal, waking up one waiting process or remember the signal if no process is waiting.
- $sig->broadcast
- Send the signal, waking up all waiting process. If no process is waiting the signal is lost.
- $sig->awaited
- Return true when the signal is being awaited by some process.
AUTHOR
- Marc Lehmann <schmorp@schmorp.de>
http://home.schmorp.de/