Re: [PATCH] compat: Allow static initializer for pthreads on Windows
- From
Philip Oakley <philipoakley@iee.org>
- Date
- Oct 28, 2016, 13:01 UTC
- Message-ID
- <B5FD05E58E36480894F1BDBBC9589EE1@PhilipOakley>
- In-Reply-To
- <2ddca5e3-3c4d-b555-4309-a180ceed581e@kdbg.org>
From: "Johannes Sixt" <j6t@kdbg.org>
Show 5 quoted lines
> > 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