Re: sigwait() equivalent

From:

Ulrich Eckhardt <eckhardt@satorlaser.com>

Newsgroups:

microsoft.public.vc.language

Date:

Mon, 07 May 2007 08:43:29 +0200

Message-ID:

<hdu2h4-ot.ln1@satorlaser.homedns.org>

Alex Blekhman wrote:

"Ulrich Eckhardt" wrote:

What I'm wondering is this now: is there an equivalent to
sigwait(), i.e. instead of simply waiting in the main thread for
the event to be set, just directly wait for a shutdown request?

I'm not sure it's possible (unless doing some low-level
dirty tricks), because documentation states clearly that new
thread is created in order to call control handler function.

This is important information I missed. For the record, POSIX signals are
called in the context of the currently active thread, which could be any
thread and even in the middle of doing some supposedly atomic operation.
That is the reason that you must not e.g. acquire locks but can only do
very few operations. If the signal handler is called in a thread, it should
be able to use any kind of inter-thread synchronisation mechanisms.

Moreover, it's highly recommended to do proper thread
synchronization between control handler and other threads in
a process. So, I reckon this behavior is by design.

Yes, in that context it makes sense.

thanks

Uli