array ( 0 => 'index.php', 1 => 'PHP Manual', ), 'head' => array ( 0 => 'UTF-8', 1 => 'en', ), 'this' => array ( 0 => 'class.syncsemaphore.php', 1 => 'SyncSemaphore', 2 => 'The SyncSemaphore class', ), 'up' => array ( 0 => 'book.sync.php', 1 => 'Sync', ), 'prev' => array ( 0 => 'syncmutex.unlock.php', 1 => 'SyncMutex::unlock', ), 'next' => array ( 0 => 'syncsemaphore.construct.php', 1 => 'SyncSemaphore::__construct', ), 'alternatives' => array ( ), 'source' => array ( 'lang' => 'en', 'path' => 'reference/sync/syncsemaphore.xml', ), 'history' => array ( ), 'extra_header_links' => array ( 'rel' => 'alternate', 'href' => '/manual/en/feeds/class.syncsemaphore.atom', 'type' => 'application/atom+xml', ), ); $setup["toc"] = $TOC; $setup["toc_deprecated"] = $TOC_DEPRECATED; $setup["parents"] = $PARENTS; manual_setup($setup); contributors($setup); ?>

The SyncSemaphore class

(PECL sync >= 1.0.0)

Introduction

A cross-platform, native implementation of named and unnamed semaphore objects.

A semaphore restricts access to a limited resource to a limited number of instances. Semaphores differ from mutexes in that they can allow more than one instance to access a resource at one time while a mutex only allows one instance at a time.

Class synopsis

class SyncSemaphore {
/* Methods */
public __construct(string $name = ?, int $initialval = 1, bool $autounlock = true)
public lock(int $wait = -1): bool
public unlock(int &$prevcount = ?): bool
}

Table of Contents