OpenSceneGraph and the OpenThreads library.
The changes in the file simply remove a few ifndef's that currently
do not allow Linux systems to fully utilize the PThread real-time
scheduling API.
Since Linux now fully supports the PThread scheduling API it would
be beneficial to have it available to use as necessary. I have
been testing this change since OSG release 3.3.7 and have not seen
any ill affects.
The Priority scheduling api is further protected by another ifdef:
#ifdef ALLOW_PRIORITY_SCHEDULING
that only appears to be defined in the pthreads implementation as
well. This would make it unlikely that anyone would be affected
by this unless they are intentionally wanting to run with priority
scheduling. In which case on Linux they would need to make
these same modifications themselves to utilize it to its full extent.
Attached file is for the current trunk as of this date.
"
git-svn-id: http://svn.openscenegraph.org/osg/OpenSceneGraph/trunk@15140 16af8721-9629-0410-8352-f15c8da7e697
This behavior is also described in the pthreads man page (http://man7.org/linux/man-pages/man3/pthread_create.3.html):
>
> Linux-specific details
> The new thread inherits copies of the calling thread's capability
> sets (see capabilities(7)) and CPU affinity mask (see
> sched_setaffinity(2)).
>
To prevent this behaviour I wrote a patch that explicitly sets the affinity mask to all cores of the system, if no specific affinity was defined with PThread::setProcessorAffinity(unsigned int) .
Thank you!
"
src/osgAnimation/Skeleton.cpp:25:87: warning: addition of default argument on redeclaration makes this constructor a copy constructor [-Wdefault-arg-special-member]
Skeleton::UpdateSkeleton::UpdateSkeleton(const UpdateSkeleton& us, const osg::CopyOp& copyop= osg::CopyOp::SHALLOW_COPY) : osg::Object(us, copyop), osg::NodeCallback(us, copyop)
/src/OpenThreads/pthreads/PThread.cpp:1024:15: warning: comparison of unsigned expression < 0 is always false [-Wtautological-compare]
if (cpunum<0) return -1;
src/osgDB/ExternalFileWriter.cpp:221:122: warning: expression result unused [-Wunused-value]
_objects.insert(ObjectsSet::value_type(&obj, ObjectData(absoluteDestinationPath, relativeDestinationPath, written))).first;
src/osgManipulator/Dragger.cpp:175:18: warning: using the result of an assignment as a condition without parentheses [-Wparentheses]
if (*itr = constraint) return;
src/osgManipulator/Dragger.cpp:187:18: warning: using the result of an assignment as a condition without parentheses [-Wparentheses]
if (*itr = constraint)
"- In order to build against GLES1 we execute:
$ mkdir build_android_gles1
$ cd build_android_gles1
$ cmake .. -DOSG_BUILD_PLATFORM_ANDROID=ON -DDYNAMIC_OPENTHREADS=OFF
-DDYNAMIC_OPENSCENEGRAPH=OFF -DANDROID_NDK=<path_to_android_ndk>/
-DOSG_GLES1_AVAILABLE=ON -DOSG_GL1_AVAILABLE=OFF
-DOSG_GL2_AVAILABLE=OFF -DOSG_GL_DISPLAYLISTS_AVAILABLE=OFF -DJ=2
-DOSG_CPP_EXCEPTIONS_AVAILABLE=OFF
$ make
If all is correct you will have and static OSG inside:
build_android_gles1/bin/ndk/local/armeabi.
- GLES2 is not tested/proved, but I think it could be possible build
it with the correct cmake flags.
- The flag -DJ=2 is used to pass to the ndk-build the number of
processors to speed up the building.
- make install is not yet supported."
