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Signal and shared memory function library: Sem_get

Source: Internet
Author: User
Keywords PHP Chinese function Manual Sem_get signal and shared memory function library
Tags aliyun function function library get html http memory php
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Sem_get

(PHP3 >= 3.0.6, PHP4)

Sem_get---&http://www.aliyun.com/zixun/aggregation/37954.html ">nbsp; Get signal ID

Syntax: int sem_get (int key [, int max_acquire [, int perm]])

Description:

Success returns the signal identifier of a positive number and the error returns false.

The ID returned by Sem_get () can be used to access the System V signal and, if necessary, establish a signal using the permission bits specified in the parameter perm (preset is 0666). Max_auquire is used to set the number of simultaneous signal processing, with a preset value of 1.

The second call to this function with the same key will return different signal identifier, but all two identifier are accessed under the same signal.

Reference: Sem_acquire () sem_release ()

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Related Keywords:
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