Mex Multithreading

Example of (Windows) multi-threading in a MEX file
Updated 2 Sep 2008

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Editor's Note: This file was selected as MATLAB Central Pick of the Week

Nowadays, Matlab is multi-threaded but most MEX files are still single threaded. This is an simple example of c-code for MEX file multi-threading.

The mex function "y = square(x)" is written in c-code and starts 2 worker threads. The first worker thread will square all values on the even input indexes x[0] x[2] .. x[n], and the second worker thread all odd indexes x[1] x[3] .. x[n]. Also demonstrates thread safety by using Mutex to lock percentage variable.

mex square.c -v;
y = square([1 2 3 4 5 6 7 8 9])

The function uses <windows.h> (function sleep ) and <process.h> ( function _beginthreadex ) which are included with visual studio and some other compilers.

This example is tested with Windows Vista 64 and Visual Studio 2008 compiler, and with (default) LCC compiler and Vista 32.

Cite As

Dirk-Jan Kroon (2024). Mex Multithreading (, MATLAB Central File Exchange. Retrieved .

MATLAB Release Compatibility
Created with R2008a
Compatible with any release
Platform Compatibility
Windows macOS Linux
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Version Published Release Notes

Now also works with the Matlab LCC compiler.