PHP: sem_acquire - Manual

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Last updated: Fri, 26 Jan 2007

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# sem_acquire

(PHP 3 >= 3.0.6, PHP 4, PHP 5)

sem_acquire -- Acquire a semaphore

## Description

bool sem_acquire ( resource sem_identifier )

sem_acquire() blocks (if necessary) until the semaphore can be acquired. A process attempting to acquire a semaphore which it has already acquired will block forever if acquiring the semaphore would cause its maximum number of semaphore to be exceeded. `sem_identifier` is a semaphore resource, obtained from sem_get().

Возвращает `TRUE` в случае успешного завершения или `FALSE` в случае возникновения ошибки.

After processing a request, any semaphores acquired by the process but not explicitly released will be released automatically and a warning will be generated.

See also sem_get(), and sem_release().

add a note User Contributed Notes
sem_acquire
gladd at trash dot eris dot qinetiq dot com
13-Apr-2004 02:02
`Just to clarify what is meant by "process" above:
On the Apache webserver, many PHP requests will be executed within the same process space because it is multithreaded. However, any semaphores got and acquired by a script and not released and removed will still be automatically cleaned up by the PHP interpreter each time the script terminates.
Remove any trash before emailing!`
24-Jun-2003 04:58
`there is no way to use IPC_NOWAIT flag.`
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sem_get msg_stat_queue

Last updated: Fri, 26 Jan 2007
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