I have ported libpthread_workqueue to Windows using the MS Visual Studio toolchain and the built-in Windows threadpool API. For compatibility with Windows XP, I am using the "legacy thread pool API" as described here: http://msdn.microsoft.com/en-us/library/ms686756%28v=vs.85%29.aspx The library also builds using the MinGW toolchain, but there are still a few bugs in the build system that need to be fixed before it can be considered fully functional. I havn't tried building a combined libdispatch+libpthread_workqueue on Windows, but will give it a try soon. Cheers, - Mark