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Top Forums Shell Programming and Scripting pdf of Unix Shell proramming by Yashwant kanetkar needed Post 302121688 by zazzybob on Monday 18th of June 2007 02:52:20 AM
Old 06-18-2007
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Thread::Semaphore(3pm)					 Perl Programmers Reference Guide				    Thread::Semaphore(3pm)

NAME
Thread::Semaphore - thread-safe semaphores SYNOPSIS
use Thread::Semaphore; my $s = new Thread::Semaphore; $s->up; # Also known as the semaphore V -operation. # The guarded section is here $s->down; # Also known as the semaphore P -operation. # The default semaphore value is 1. my $s = new Thread::Semaphore($initial_value); $s->up($up_value); $s->down($up_value); DESCRIPTION
Semaphores provide a mechanism to regulate access to resources. Semaphores, unlike locks, aren't tied to particular scalars, and so may be used to control access to anything you care to use them for. Semaphores don't limit their values to zero or one, so they can be used to control access to some resource that there may be more than one of. (For example, filehandles). Increment and decrement amounts aren't fixed at one either, so threads can reserve or return multiple resources at once. FUNCTIONS AND METHODS
new new NUMBER "new" creates a new semaphore, and initializes its count to the passed number. If no number is passed, the semaphore's count is set to one. down down NUMBER The "down" method decreases the semaphore's count by the specified number, or by one if no number has been specified. If the sema- phore's count would drop below zero, this method will block until such time that the semaphore's count is equal to or larger than the amount you're "down"ing the semaphore's count by. up up NUMBER The "up" method increases the semaphore's count by the number specified, or by one if no number has been specified. This will unblock any thread blocked trying to "down" the semaphore if the "up" raises the semaphore count above the amount that the "down"s are trying to decrement it by. perl v5.8.0 2002-06-01 Thread::Semaphore(3pm)
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