From: Philip Oakley <philipoakley@iee.org>
Date: Fri, 28 Oct 2016 13:01:45 GMT
Subject: Re: [PATCH] compat: Allow static initializer for pthreads on Windows
Message-ID: <B5FD05E58E36480894F1BDBBC9589EE1@PhilipOakley>
In-Reply-To: <2ddca5e3-3c4d-b555-4309-a180ceed581e@kdbg.org>

From: "Johannes Sixt" <j6t@kdbg.org>
>
> One point is that the DCLP idiom must be implemented correctly. There are 
> solutions, of course, and when the initialization is over, we have a 
> miniscule overhead at each pthread_mutex_lock call.
>

I had to look up DCLP ( = Double Checked Locking Patterns), and found a good 
write up on the issues..

http://www.aristeia.com/Papers/DDJ_Jul_Aug_2004_revised.pdf "C++ and the 
Perils of Double-Checked Locking", which include 'C' issues, and 
multi-thread, multi-processor issues. Not an easy issue when fighting 
optimisers..

--

Philip