On 30-10-2012 19:04, Sean Kelly wrote:
On Oct 25, 2012, at 11:18 PM, Jacob Carlborg <d...@me.com> wrote:
On 2012-10-26 01:18, Sean Kelly wrote:
On Oct 25, 2012, at 4:12 PM, Alex Rønne Petersen <a...@lycus.org> wrote:
What's used on OS X? I forget...
The method used is similar to how GC works on Windows--there's a kernel call
that can be used to explicitly suspend a thread. I can't remember the function
name offhand though.
The Posix functions weren't working properly?
The semaphore implementation for OSX is not signal-safe. Originally, druntime
used the signal approach on OSX and had deadlock issues in the signal handler
(OSX semaphores wrap a global mutex to obtain something from a shared pool).
Also, semaphores on OSX are just ridiculously slow. The current method for
suspending and scanning threads on OSX is much faster. I wish Posix in general
had the same feature. Using signals is really a hack.
It may be worth dropping use of SIGUSR1/2 in favor of the realtime signals as
well, since SIGUSR1/2 are in pretty common use.
Real time signals as in?
--
Alex Rønne Petersen
a...@lycus.org
http://lycus.org