pd->tid.set( (void*)_beginthreadex(NULL,static_cast<unsigned>(pd->stackSize),ThreadPrivateActions::StartThread,static_cast<void *>(this),0,&ID));
the method "pd->tid.set" sets the thread id, however via the startup function "ThreadPrivateActions::StartThread" that thread id is used (see further down the call hierarchy the line "int status = SetThreadPriority( pd->tid.get(), prio);".
Until now I never ran into any problem in debug or release builds, though. It seems that furtunately the tid.set method was executed always before the tid.get method in the startup code. However, this may make trouble in the furture. A simple solution is the following: just replace the line above with following two lines:
pd->tid.set( (void*)_beginthreadex(NULL,static_cast<unsigned>(pd->stackSize),ThreadPrivateActions::StartThread,static_cast<void *>(this),CREATE_SUSPENDED,&ID));
ResumeThread(pd->tid.get());
The trick is just starting the thread in suspended mode so the StartThread function does not get executed and we can safely store the tid by pd->tid.set. Then start the Thread by calling ResumeThread."
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!
"
the following error:
Users/stephan/Documents/Projekte/cefix/cefix/ios/../../libs/ios/include/OpenThreads/Atomic:244:48:
error: cannot initialize a parameter of type 'void *' with an lvalue of
type 'const void *const'
return __sync_bool_compare_and_swap(&_ptr, ptrOld, ptrNew);
This can be solved by a cast to '(void*)ptrOld'. This should be benign since both
'ptrOld' and 'ptrNew' are only read and the cast is in fact in place for all other
implementations as well.
On OS X the cast compiles cleanly on both g++ (i686-apple-darwin11-llvm-g++-4.2 (GCC)
4.2.1) and clang++ (Apple clang version 3.1 (tags/Apple/clang-318.0.54)).
"
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)
have noticed that on my 64-bit Linux machines, all of the OSG libraries
get installed into the "lib64" directory as I would expect. However, the
OpenThreads library gets installed into the "lib" directory when
selecting "Build OpenThreads with Qt threading support." That is, with
the BUILD_OPENTHREADS_WITH_QT set to ON.
I am attaching the a fix for this issue in the file:
src/OpenThreads/qt/CMakeLists.txt
It simply adds ${LIB_POSTFIX} to the destination as in done with all
other CMakeLists.txt with libraries in OSG. I have tested it on both
32-bit and 64-bit Linux."
but I've moved this initialization into the constructor to make the code more managable.
CID 11686: Uninitialized scalar field (UNINIT_CTOR)
Non-static class member cnt is not initialized in this constructor nor in any functions that it calls.
Non-static class member maxcnt is not initialized in this constructor nor in any functions that it calls.
Non-static class member phase is not initialized in this constructor nor in any functions that it calls.
code is clean and more mantainable.
CID 11676: Uninitialized scalar field (UNINIT_CTOR)
Non-static class member cancelMode is not initialized in this constructor nor in any functions that it calls.
Non-static class member cpunum is not initialized in this constructor nor in any functions that it calls.
Non-static class member detached is not initialized in this constructor nor in any functions that it calls.
Non-static class member isRunning is not initialized in this constructor nor in any functions that it calls.
Non-static class member stackSize is not initialized in this constructor nor in any functions that it calls.
Non-static class member threadPolicy is not initialized in this constructor nor in any functions that it calls.
Non-static class member threadPriority is not initialized in this constructor nor in any functions that it calls.
Non-static class member uniqueId is not initialized in this constructor nor in any functions that it calls.
CID 11564: Unsigned compared against 0 (NO_EFFECT)
This less-than-zero comparison of an unsigned value is never true. "cpunum < 0U".
"- 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."
hpux. I have skipped irix this time as irix is too dead to keep osg building
there.
As usual, solaris does not like member templates in stl containers.
Some headers missing and link problems due to missing libraries."
"changed the CmakeFiles for OpenThreads and the
osg-frameworks, so they are versioned by OPENSCENEGRAPH_SOVERSION. "
And from a later email:
"Attached you'll find a fixed version of ModulInstall.cmake. Hopefully it
works for old CMake-versions. I removed the offending line, and the
compile went fine on my end."
IF(!OSG_COMPILE_FRAMEWORKS) ...
vs.
IF(NOT OSG_COMPILE_FRAMEWORKS) ...
This has the effect of always compiling OpenThreads as a framework under OSX. The CMakeLists.txt that I use to be able to compile the non-framework version of OpenThreads is attached. I simply replaced the '!' replaced by a 'NOT' and added a MESSAGE to notify me when the .framework will be compiled."
- compile errors on windows when compiled with UNICODE flag
- warnings for duplicate WIN32_LEAN_AND_MEAN. I think this should
better fixed by adding WIN32_LEAN_AND_MEAN to vcproj preprocessor
list."
Mathieu Marache, he added the last missing piece to this puzzle.
I think it is safe to commit these changes to trunk, as the traditional
way via dylibs should work as before.
Here's some more info how to get frameworks:
With these modifications it is possible to compile frameworks on OS X,
when you set the Cmake-option OSG_COMPILE_FRAMEWORKS to true. If you
want to embed the frameworks in your app-bundle make sure to set
OSG_COMPILE_FRAMEWORKS_INSTALL_NAME_DIR accordingly.
You'll have to build the install-target of the generated xcode-projects
as this sets the install_name_dirs of the frameworks and plugins."
only create 376, then the program would hang.
376 * 8MB stack per thread = 3008 MB
The stack size allocated per thread blew the process address stack.
To get more threads you have to specify a smaller per thread stack,
but while the Thread::start says it will limit the stack size to the
smallest allowable stack size, it won't let it be smaller than the
default. I included the limits.h header to use PTHREAD_STACK_MIN as
the minimum stack size.
As for the deadlock, if the pthread_create failed, the new thread
doesn't exist and doesn't call threadStartedBlock.release(), so the
existing thread deadlocks on threadStartedBlock.block(). Only block
if the thread was started."
while in an else clause. When if is true the phase changes and the
while condition will always by false, so might as well put the while
in the else to skip the check. There's also a benefit to having the
code logic similar between platforms.
"
Barrier operations. The error is with atomic operations in the
win32 condition implementation. The attached sample program will
reliably trigger with as few as three threads and a dual core system,
though sometimes it will take 65,000 iterations.
2.8.1 was the base for these changes
Win32ConditionPrivateData.h
Win32ConditionPrivateData::wait does two operations to decrement
waiters_ then read, when InterlockedDecrement decrements and returns
the value in one operation. The two operations allows another thread
to also decrement with both getting 0 for an answer.
Win32ConditionPrivateData::broadcast is using waiters_ directly
instead of using the w value read earlier, if it was safe to use
waiters_ directly there would be no need for InterlockedGet or w.
overview of deadlock in barrier with three threads
one thread in broadcast, 2 threads in wait,
release semaphore 2, waits on waiters_done_
both threads wake, decrement waiters_, get 0 for w,
<logic error here>
one calls set waiters_done_,
broadcast thread comes out of waiters_done_,
other thread calls waiters_done_, (which leaves waiters_done_ in the
signaled state)
<sets the trap>
broadcast thread returns releases mutex, other threads get
mutex and also return,
next barrier, first two threads enter wait, one goes to broadcast, release
semaphore 2, skips waiters_done_ as it had been released last time
returns, processes, enters the barrier for the next barrier operation
and waits,
three threads are now in wait, two have the previous barrier phase,
one the current phase, there's one count left in the semaphore which a
thread gets, returns, enters the barrier as a waiter, sleeps, and the
deadlock is completed"
_beginthreadex() fails but OpenThreads still waits on the startup
Block before returning to the caller of OpenThreads::Thread::start().
This causes a deadlock. The return value of _beginthreadex() is
actually checked, but after the call to OpenThreads::Block::block() so
it is basically useless.
Attached is a fix to move the check for the return value of
_beginthreadex() before the call to block(), so that start() can
return to the caller with a non-zero error code. This solves the
problem for me."
order, and not in the order they are listed in the constructor. To
avoid possible trouble, gcc warns about this. Attached modification
fixes the initializer order to silence this warning."
Also, there was also a small bug in osgDB's CMakeLists.txt that was causing an error when I tested with CMake 2.4.4.
IF(${OSG_DEFAULT_IMAGE_PLUGIN_FOR_OSX} STREQUAL "quicktime")
was changed to
IF(OSG_DEFAULT_IMAGE_PLUGIN_FOR_OSX STREQUAL "quicktime")
"
