So I did a writeup of what I thought might be the next direction to go with the interruptible patch: http://blog.ezyang.com/2010/09/towards-platform-agnostic-interruptibility/ The really interesting bit (which I didn't cover) is what information to give to the user functioSo I did a writeup of what I thought might be the next direction to go with the interruptible patch: http://blog.ezyang.com/2010/09/towards-platform-agnostic-interruptibility/ The really interesting bit (which I didn't cover) is what information to give to the user function. It needs to be somewhat under the hood: if someone wants to pthread_cancel they need to know what the pthreads ID is; if they want to transmit a Windows event they need some way to get a hold of the event handle associated with the foreign call. Edward