Memory Mapped Files

This article is intended to extend the idea of Inter Process Communication with a Memory Mapped File object by using a class that handles that memory object (or any memory) as a memory pool, a "heap". This class, CAllocationHandler, creates a layout of that memory consisting of a header, an allocation table, and a memory area where the allocated memory blocks resides. Those memory blocks may be moved by the class during the allocation/deallocation calls, so the memory blocks are mainly handled using "memory handles".

To directly access a memory block, it must be locked through this handle. The memory handle can also be transferred between processes that uses the same Memory Mapped File object and used to access the data.

The archive AllocationHandler_src contains the class files
  • AllocationHandler.h
  • AllocationHandler.cpp
  • AllocationHandler.inl
and the article (a plain text file)
  • AllocationHandler.txt
The archive AllocationHandler_demo contains a simple Console application that demonstrates the use of CAllocationHandler by simulating two producer threads of data allocated on the "heap", then saving the memory handles in a CList that is periodically checked by a consumer thread.

Downloads

Download demo project - 7 Kb
Download source - 15 Kb


Comments

  • Deadlocks!

    Posted by Legacy on 02/16/2004 12:00am

    Originally posted by: Raymond Lee

    The code seems to deadlock all the time on my machine (Win2K Pro). I haven't tried to debug it. Looks like a good piece of code otherwise!

    Reply
Leave a Comment
  • Your email address will not be published. All fields are required.

Top White Papers and Webcasts

  • On-Demand eSeminar DevOps and Cloud are all the rage in IT, but the two terms relating process and computing aren't mutually exclusive. Join us to see how your movement into cloud changes the way you develop, deploy, test and manage, and how DevOps can actually be a good thing when coupled with cloud.

  • On-demand Event Event Date: May 18, 2015 While the idea of using facial and/or gesture recognition to create a modern, intuitive game seems attractive, some developers may want to leverage Unity 3D as a way to accelerate their development efforts. There are many different ways in which Intel and Unity Technologies have been working together to help speed the development of games with the Intel&reag; RealSense™ SDK (software developer kit). Check out this webcast to join a panel of experts as they …

Most Popular Programming Stories

More for Developers

RSS Feeds

Thanks for your registration, follow us on our social networks to keep up-to-date