#13 CfixCreateThread2 limited to 64 threads

[Andy Dent]

There appears to be a 64 thread limit on CfixCreateThread2 but it is not documented as such in http://www.cfix-testing.org/unit-testing-framework/windows/doc/CfixCreateThread2.html

I have a 32bit process that has a trivial thread proc - the test was creating 99 of them happily with the Win32 CreateThread. When I moved to using CfixCreateThread2, so I could use cfix functions in the thread procs, it only creates a max of 64 threads.

Using Visual Assert 1.1.0 Build 3780 with Visual Studio 2008 SP1 on WIndows7 x64.

[Johannes Passing]

That is correct, there is an upper limit of 64 threads. The reason for this is that cfix attempts to join all child threads spawned by a test case before it proceeds with the next test case. It does this using WaitForMultipleObject, which, of course, imposes a limit of 64 threads.

This limit could be circumvented, though.

(In case you are interested in fixing it yourself, I will happily accept a patch...)

[Andy Dent]

A documentation change to warn people of the limit would be quite sufficient for me, just copy and paste your explanation above!

thanks for a great toolkit. I work for a multinational mining software company and am pushing for us to standardise on Visual Assert for our native code.