Re: suspending a thread and executing it later

["Lee Chin" <leechin@mail.com>]

Do pthreads and getcontext/setcontext work nicely with each other?

Thanks
Lee
----- Original Message -----
From: Steven Smith <sos22@cam.ac.uk> 
Date: Sat, 18 Jan 2003 17:46:44 +0000
To: Lee Chin <leechin@mail.com>
Subject: Re: suspending a thread and executing it later

> > Here is what I want to do... in my program, I want to arbitrarily in
> > some function suspend the execution of the current (self) thread and
> > schedule my self to resume from that point later.
> Have a look at ``info libc "Non Local Exits" "System V Contexts"''.
> The basic idea is to have one ucontext per thread.  When the running
> thread wants to block, it picks some other thread, and then
> swapcontext()s with it.
> 
> > In my program, I only have 2 threads... and lets say thread 1 ends
> > up calling a function foo() that will block on IO.  I dont want to
> > make the whole system block, so I want to resume the execution of
> > foo() when the IO completes and restore thread state so that the
> > stack (function call history and all) is maintained.
> The easy way to do this is via pthreads, but if you really want to
> do it yourself, you'll probably need to set every file descriptor
> to non-block mode, and then swapcontext() whenever an IO
> function returns EAGAIN.
> 
> Steven Smith,
> sos22@cam.ac.uk.

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