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:
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.