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22.16. Win32::Semaphore

The Win32::Semaphore module
implements semaphores, synchronizing access to shared resources. The
constructor new creates a new semaphore object and
sets the initial count and the maximum count of the semaphore. The
constructor has the following syntax:

$sem = Win32::Semaphore->new(init, max, [name]);

The arguments are defined as follows:

init

The initial count of the semaphore

max

The maximum count of the semaphore

name

A string containing a name of the semaphore

The open constructor
opens an existing semaphore object specified by
name:

$sem = Win32::Semaphore->open(name);

The following methods can be used on Win32::Semaphore objects.

$sem->release(inc, [$var])

Releases a semaphore and increments the
count by the amount specified in inc. The
last count (before the increment) is returned in the
$var variable, if
provided.

$sem->wait([timeout])

The inherited Win32::IPC call. Waits
for the semaphore''s count to be nonzero, then
decrements it. Optional timeout is given
in milliseconds.