Shared Memory

The Shared Memory component provides cross-platform access to shared memory.

This module makes it simple to employ shared memory in Qt applications. Shared memory can be used for high-speed inter-process communication. It provides a portable, platform-independent class API to the shared memory mechanism of the underlying operating system, and implements a locking mechanism to ensure safe access from multiple concurrent processes.

This Qt Solutions component is for Qt 3. For Qt 4 Solutions, please visit the Qt 4 Solutions Catalog.

Documentation:

Classes

• QtSharedMemory

• Shared memory between threads
• Shared memory between processes

Tested on:

• Qt 3.3.6 / Windows XP / MSVC.NET 2003
• Qt 3.3.6 / Linux / gcc
• Qt 3.3.6 / SunOS 5.9 / SunC++
• Qt 3.3.6 / MacOS X 10.4 / gcc

Unsupported platforms:

Only the tested platforms are supported, however the classes should be platform independent and are likely to work on the platforms supported by Qt.

Download Commercial Edition:

• qtsharedmemory-1.2-enterprise.zip
• qtsharedmemory-1.2-enterprise.tar.gz

Changes:

• 1.2: Windows: Support attaching in readonly mode.
• 1.2: Windows: Improved speed and robustness.
• 1.1: lock() is now allowed before create() and attach()
• 1.1: The functions exists() and destroy() now work reliably
• 1.1: Support for Mac OS X with proper use of semctl for the UNIX port.