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(PECL sync >= 1.0.0)
A cross-platform, native implementation of named and unnamed sempahore 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.
$name
[, integer $initialval
[, bool $autounlock
]]] )$wait
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