NAME

Coro::RWLock - reader/write locks

SYNOPSIS

            

              
              
use Coro;
$lck = new Coro::RWLock;
$lck->rdlock; # acquire read lock
$lck->unlock; # unlock lock again
# or:
$lck->wrlock; # acquire write lock
$lck->unlock; # unlock lock again
# try a readlock
if ($lck->tryrdlock) {
   ...;
   $l->unlock;
}
# try a write lock
if ($lck->trywrlock) {
   ...;
   $l->unlock;
}
            
          

DESCRIPTION

This module implements reader/write locks. A read can be acquired for read by many coroutines in parallel as long as no writer has locked it (shared access). A single write lock can be acquired when no readers exist. RWLocks basically allow many concurrent readers (without writers) OR a single writer (but no readers).

You don't have to load Coro::RWLock manually, it will be loaded automatically when you use Coro and call the new constructor.

$l = new Coro::RWLock;

Create a new reader/writer lock.

$l->rdlock

Acquire a read lock.

$l->tryrdlock

Try to acquire a read lock.

$l->wrlock

Acquire a write lock.

$l->trywrlock

Try to acquire a write lock.

$l->unlock

Give up a previous rdlock or wrlock.

AUTHOR/SUPPORT/CONTACT

            

              
              
Marc A. Lehmann <schmorp@schmorp.de>
http://software.schmorp.de/pkg/Coro.html