PHP Classes

IPC Shared Memory: Access data stored in shared memory containers

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ipc_sharedmem 1.0.0GNU Lesser Genera...PHP 5, System information
Description 

Author

Craig Manley

This is a package that can be used to share information between different processes using several types of shared memory containers.

A few shared memory container classes are provided implementing the same interface: file based, SysV shm, MySQL record.

The interface has functions for atomically fetching or storing shared memory data and also functions to start or finish transactions that allow multiple read or write access operations to be safely execute assuring the necessary integrity.

Innovation Award
PHP Programming Innovation award nominee
January 2005
Number 3

Prize: One book of choice by O'Reilly		 Using shared memory is a solution for exchanging information between two or more processes or programs, that may or may not be running at the same time, in the same computer or even in different computers.

The uses of shared memory can be for instance: accessing to information application variables, exchanging messages between programs, etc..

Depending on the requirements of the applications that can benefit from its use, shared memory can be implemented using for instance OS specific shared memory extensions, memory mapped files and database accessible remotely via a network.

This class implements an abstracted solution that provides a single interface for accessing storing and retrieving information from different types of shared memory containers, thus making it possible to switch between container types as the requirements of an application evolve.

Manuel Lemos
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Details

INSTALLATION:
Create the following directory structure somewhere in you PHP search path:
IPC/SharedMem

Copy ISharedMem.php into the IPC directory.
Copy File.php, ShmOp.php, and MySQL.php into the IPC/SharedMem directory.

USAGE:
See the test/example scripts.

  Files folder image Files (11)  
File Role Description
Plain text file File.php Class File based shared memory class.
Plain text file MySQL.php Class MySQL based shared memory class.
Accessible without login Plain text file README.TXT Doc. Instructions
Plain text file SharedMem.php Class Common Interface class.
Plain text file ShmOp.php Class PHP shmop and sysvsem extensions based shared memory class.
Accessible without login Plain text file tfile_atomic.php Example Example/test script for IPC_SharedMem_File class.
Accessible without login Plain text file tfile_trans.php Example Example/test script for IPC_SharedMem_File class.
Accessible without login Plain text file tmysql_atomic.php Example Example/test script for IPC_SharedMem_MySQL class.
Accessible without login Plain text file tmysql_trans.php Example Example/test script for IPC_SharedMem_MySQL class.
Accessible without login Plain text file tshmop_atomic.php Example Example/test script for IPC_SharedMem_ShmOp class.
Accessible without login Plain text file tshmop_trans.php Example Example/test script for IPC_SharedMem_ShmOp class.

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  Other classes that need this package  
Class Why it is needed Dependency
Authen_DAP for shared memory Required