RE: deferred cancellation of ipc

[Volkmar Uhlig]

After reading your initial scenario again there is a rather simple
solution--use zero timeouts.  Instead of storing the cancel flag you
store the intended send timeout value, which could be zero.  Of course
you still run into a race on MP if you don't use some synchronization
primitive, but that is a different issue you have to deal with anyway.  
This solution assumes that you _only_ want to ensure that the thread
does not block.

> Or does maybe stopping a thread on another CPU count as 
> preemption and is also delayed?

Sorry, but I don't get what you mean.  What is "stopping"; exregs?

- Volkmar