Signal and shared memory function library: Shm_attach

Source: Internet
Author: User
Keywords PHP Chinese function Manual Shm_attach signal and shared memory function library
Tags aliyun create function function library html http key memory


(PHP3 >= 3.0.6, PHP4)

Shm_attach---& ">nbsp; Create or open a shared memory section

Syntax: int shm_attach (int key [, int memsize [, int perm]])


The ID returned by Shm_attach () can be used to access System V shared memory, and a shared memory memsize part (segment) is established on the first call (preset is php.ini set value in Php3.ini or Sysvshm.init_mem. Otherwise, the 10000 bytes) and the non-essential option perm (Preset is 0666).

The second call to Shm_attach () under the same key will return different shared memory identifier, but all two identifier are accessed under the same shared memory, Memsize and Perm will be ignored.

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