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File: sharedmemory.class.php

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  Classes of Richard Keizer  >  Shared Memory  >  sharedmemory.class.php  >  Download  
File: sharedmemory.class.php
Role: Class source
Content type: text/plain
Description: Mainclass
Class: Shared Memory
Store and retrieve information in shared memory
Author: By
Last change: comment tweaks
Date: 3 years ago
Size: 1,531 bytes
 

Contents

Class file image Download
<?php

   
//
    // SharedMemory class
    //
    // Freeware
    // you can use this freely without any warranty
    // comments are appreciated: ra dot keizer at gmail dot com


   
class SharedMemory {
        public
$key; //unique identifier for the shared memory block
       
public $shm; //holds shared memory resource
       
public $mutex; //holds the mutex
       
public $size; //bytes to allocate
       
       
public function __construct($key=3354354334, $size=10000) { //default key, can be overridden, same for size
           
$this->key = $key;
           
$this->size = $size;
           
$this->Attach(); //create resources (shared memory + mutex)
       
}
       
       
//create resources
       
public function Attach() {
           
$this->shm = shm_attach($this->key, $this->size); //allocate shared memory
           
$this->mutex = sem_get($this->key, 1); //create mutex with same key
       
}
       
       
//write to shared memory
       
public function Set($var) {
           
sem_acquire($this->mutex); //block until released
           
shm_put_var($this->shm, $this->key, $var); //store var
           
sem_release($this->mutex); //release mutex
       
}
       
       
//read from shared memory
       
public function Get() {
           
sem_acquire($this->mutex); //block until released
           
$var = @shm_get_var($this->shm, $this->key); //read var
           
sem_release($this->mutex); //release mutex
           
return $var;
        }

       
// in case you want to serialize/unserialize the sharedmemory object
        // this method restores all resources after unserializing
       
public function __wakeup() {
           
$this->Attach();
        }

    }





?>