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

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