] On Behalf Of Tanguy
Fautre
Sent: 06 August 2009 13:59
To: OpenSceneGraph Users
Subject: Re: [osg-users] Deadlock when loading osg.dll, singletons are
evil
Hi Robert,
We've got a custom build of OSG where we've commented out all the unsafe
getenv (we do not use env variables in our application anyway
Hi Tanguy,
On Fri, Aug 7, 2009 at 3:14 PM, Tanguy
Fautretang...@aristechnologies.com wrote:
I had the chance to test your patch. As expected, it fixes the problem.
The debugger shows the singleton is only initialized well after DllMain
has been called. No deadlock to report.
Great, a good
...@lists.openscenegraph.org
[mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Robert
Osfield
Sent: 07 August 2009 15:51
To: OpenSceneGraph Users
Subject: Re: [osg-users] Deadlock when loading osg.dll, singletons are
evil
Hi Tanguy,
On Fri, Aug 7, 2009 at 3:14 PM, Tanguy
Fautretang
[mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Robert
Osfield
Sent: 05 August 2009 13:26
To: OpenSceneGraph Users
Subject: Re: [osg-users] Deadlock when loading osg.dll, singletons are
evil
Hi Tanguy,
On Wed, Aug 5, 2009 at 12:55 PM, Tanguy
Fautretang...@aristechnologies.com wrote
Hi Tanguy,
static Mutex s_mutex;
const char * getSingletonGlExtensionDisable()
{
ScopedLock lock(s_mutex);
static const char * env = getenv(OSG_GL_EXTENSION_DISABLE);
return env;
}
This doesn't make sense, because 'getenv' is called only once, during
the initialization
;
return object;
}
Cheers,
Tanguy
-Original Message-
From: osg-users-boun...@lists.openscenegraph.org
[mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Daniel
Trstenjak
Sent: 06 August 2009 12:24
To: OpenSceneGraph Users
Subject: Re: [osg-users] Deadlock when loading
Hi Tanguy,
I was wondering about the possibility of wrapping up the access to the
sensitive C functions using a Mutex. We couldn't do it in local code,
but would need to do it via a single custom getenv() etc. function
implementation, otherwise we'd still end up with multiple functions
: osg-users-boun...@lists.openscenegraph.org
[mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Robert
Osfield
Sent: 06 August 2009 12:48
To: OpenSceneGraph Users
Subject: Re: [osg-users] Deadlock when loading osg.dll, singletons are
evil
Hi Tanguy,
I was wondering about the possibility
Hi Tanguy,
Your proposed solution looks like a variant of the Double Checked
Locking. Unfortunately, this design pattern is very subtly broken and
not thread safe. See
http://www.aristeia.com/Papers/DDJ_Jul_Aug_2004_revised.pdf for more
information.
It depends what you want to make thread
Hi Tanguy,
On Thu, Aug 6, 2009 at 12:53 PM, Tanguy
Fautretang...@aristechnologies.com wrote:
Unfortunately serializing the access to getenv() is not likely to solve
the issue. The problem is not that OSG calls several getenv() in
parallel, the problem is that getenv() should not be called *at
...@lists.openscenegraph.org
[mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Robert
Osfield
Sent: 06 August 2009 13:14
To: OpenSceneGraph Users
Subject: Re: [osg-users] Deadlock when loading osg.dll, singletons are
evil
Hi Tanguy,
On Thu, Aug 6, 2009 at 12:53 PM, Tanguy
Fautretang
Hi Tanguy,
As a first step I've just moved the GLExtension.cpp code that does the
static getenv() into the osg::getGLExtensionDisableString() method so
it now reads:
std::string osg::getGLExtensionDisableString()
{
static const char* envVar = getenv(OSG_GL_EXTENSION_DISABLE);
static
).
Cheers,
Tanguy
-Original Message-
From: osg-users-boun...@lists.openscenegraph.org
[mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Robert
Osfield
Sent: 06 August 2009 13:28
To: OpenSceneGraph Users
Subject: Re: [osg-users] Deadlock when loading osg.dll, singletons are
evil
Hi
Hi Tanguy,
I don't have a windows box to test against so can't do anything first
hand. It does very much sound like Windows threading issue that will
require a specific Windows mechanism in your application set up to
avoid hitting these problems. I don't what what the solution might
be, but
: Re: [osg-users] Deadlock when loading osg.dll, singletons are evil
Hi Tanguy,
I don't have a windows box to test against so can't do anything first
hand. It does very much sound like Windows threading issue that will
require a specific Windows mechanism in your application set up to
avoid
Hi Tanguy,
On Wed, Aug 5, 2009 at 12:55 PM, Tanguy
Fautretang...@aristechnologies.com wrote:
To come back to the deadlock issue, I don't think there is any way to fix it
without breaking the current OSG API compatibility. While I would favour
removing the singletons (and would heavily
Message-
From: osg-users-boun...@lists.openscenegraph.org
[mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Aymeric
Barthe
Sent: 30 July 2009 07:46
To: osg-users@lists.openscenegraph.org
Subject: Re: [osg-users] Deadlock when loading osg.dll, singletons are
evil
bthrall wrote
bthrall wrote:
The links you posted explicitly said that creating synchronization primitives
is allowed in DllMain; the problem is acquiring them when other threads are
trying to acquire the loader lock (to enter some DllMain function). Are you
saying that the problem is the mutex used
aymericb wrote:
The violation is that no C function should be called from DllMain().
Sorry. Small/Big mistake here. Forgot one important word. I meant The
violation is that no C library function should be called from DllMain().
The deadlock problem is clearly similar to the one
Hi,
We've encountered several times a random deadlock that would happen when
starting our application. After some playing around, we've identified
the problem to be quite a subtle one.
Here is what's happening. When osg.dll (in our case the full name is
osg59-osgd.dll) gets loaded, it
Hi Tanguy,
We've encountered several times a random deadlock that would happen when
starting our application. After some playing around, we've identified
the problem to be quite a subtle one.
What you're describing makes sense in some way, but I have two questions:
1. Why have there not been
: 29 July 2009 17:28
To: OpenSceneGraph Users
Subject: Re: [osg-users] Deadlock when loading osg.dll, singletons are evil
Hi Tanguy,
We've encountered several times a random deadlock that would happen when
starting our application. After some playing around, we've identified
the problem
be
helpful, I think.
-Original Message-
From: osg-users-boun...@lists.openscenegraph.org
[mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of
Jean-Sébastien Guay
Sent: 29 July 2009 17:28
To: OpenSceneGraph Users
Subject: Re: [osg-users] Deadlock when loading osg.dll
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