Subj : Re: double-checked locking in C
To   : comp.programming.threads
From : Marcin 'Qrczak' Kowalczyk
Date : Thu Jul 07 2005 09:30 pm

Joe Seigh <jseigh_01@xemaps.com> writes:

> So what kind of value could PTHREAD_ONCE_INIT have that couldn't be
> memcpy'd from an initialized pthread_once_t object never otherwise
> used?

Platform-specific magic which causes this memory location to be
registered with the OS on program initialization as a synchronization
object, thus saving a conditional registration on each pthread_once
call.

I don't think that any platform does this in practice, but it's
probably possible in theory and not necessarily useless.

-- 
   __("<         Marcin Kowalczyk
   \__/       qrczak@knm.org.pl
    ^^     http://qrnik.knm.org.pl/~qrczak/

.