On 30.03.2009 20:58, Jeff Trawick wrote:
On Mon, Mar 30, 2009 at 2:33 PM, Jeff Trawick <traw...@gmail.com
<mailto:traw...@gmail.com>> wrote:
On Mon, Mar 30, 2009 at 2:07 PM, Jim Jagielski <j...@jagunet.com
<mailto:j...@jagunet.com>> wrote:
Anyone know if:
# POSIX semaphores and cross-process pthread mutexes are not # used
by default since they have less desirable behaviour when # e.g. a
process holding the mutex segfaults.
is still applicable, at least for posix sems?
AFAIK, the Solaris-specific recovery logic for cross-process pthread
mutexes has been working reliably for a long time, but with the
current wind direction APR is choosing fcntl(), which has sysdef
implementations on that
ugh; "sysdef implications"
and quite often shows EDEADLOCK, even when you can prove there can't be
one. Especially when starting to use more than one lock of that type
(e.g. when SSL comes into the game).
platform.
no clues here about the POSIX semaphores
I would be much interested in an answer as well. Because of the
EDEADLOCK problems I did suggest using the pthread based mutex on
Solaris for a while to people and got no problem reports. But what
experience do others have?
In a related thread on the Tomcat users list about mod_jk I wrote in
February:
I now did some searching and it turns out that the implementation of
pthread mutexes for Solaris 10 has very recently changed quite a bit.
So all speculations about improved pthread mutex behaviour
(especially for "robust" mutexes) in the last years might have become
obsolete.
The new implementation is contained in Solaris kernel patch 137137-09
and most likely also in Solaris 10 Update 6 (10/08). I didn't check,
whether that update simply contains the kernel patch or the fix is
included independently.
Some detail is logged in Sunsolve under the bug IDs
6296770 2160259 6664275 6697344 6729759 6564706
Regards,
Rainer
