Hi all,
I am porting my code to the iphone and I am experiencing crashes, as my
code uses osg::observer_ptr. My code works without problems on Mac and
Windows, so I suspect that the fault is not in my code.
To isolate the problem a little bit more, I coded the following simple
example:
class MyTest : public osg::Referenced {
public:
MyTest(osg::Referenced* ref) : osg::Referenced(), _ref(ref) {}
void check() {
if (_ref.valid())
{
std::cout << "ref is valid" << std::endl;
} else {
std::cout << "ref is invalid" << std::endl;
}
}
private:
osg::observer_ptr<osg::Referenced> _ref;
};
void test_observer()
{
osg::ref_ptr<osg::Referenced> ref = new osg::Referenced();
osg::ref_ptr<MyTest> mytest = new MyTest(ref);
// shows "ref is valid"
mytest->check();
ref = NULL;
// shows "ref is invalid"
mytest->check();
// crashes in the d'tor
mytest = NULL;
}
wenn calling test_observer I get a crash at the line mytest = NULL,
here's the stack-trace:
#0 0x000540f7 in OpenThreads::ScopedLock<OpenThreads::Mutex>::ScopedLock
at ScopedLock:31
#1 0x0000ad0b in osg::Referenced::unref at Referenced:185
#2 0x00072634 in osg::ref_ptr<osg::ObserverSet>::~ref_ptr at ref_ptr:35
#3 0x00072651 in osg::observer_ptr<osg::Referenced>::~observer_ptr at
observer_ptr:70
#4 0x00072912 in MyTest::~MyTest at osgAppDelegate.mm:21
#5 0x00027fa5 in osg::Referenced::signalObserversAndDelete at
Referenced.cpp:319
#6 0x0000ad7d in osg::Referenced::unref at Referenced:198
#7 0x00072757 in osg::ref_ptr<MyTest>::operator= at ref_ptr:58
#8 0x00071915 in test_observer at osgAppDelegate.mm:53
inspecting the _refMutex it seems it points to a random memory address.
As I compiled osg for the iPhone there's a chance, that the defines are
not correctly, for reference here's
OpenThreads/Config
#ifndef _OPENTHREADS_CONFIG
#define _OPENTHREADS_CONFIG
#define OT_LIBRARY_STATIC
#include <AvailabilityMacros.h>
#define _OPENTHREADS_ATOMIC_USE_MUTEX
//static link required on IPhone
#define OT_LIBRARY_STATIC
/* #undef _OPENTHREADS_ATOMIC_USE_GCC_BUILTINS */
/* #undef _OPENTHREADS_ATOMIC_USE_MIPOSPRO_BUILTINS */
/* #undef _OPENTHREADS_ATOMIC_USE_SUN */
/* #undef _OPENTHREADS_ATOMIC_USE_WIN32_INTERLOCKED */
/* #undef _OPENTHREADS_ATOMIC_USE_MUTEX */
#endif
and osg/Config:
#ifndef OSG_CONFIG
#define OSG_CONFIG 1
//static link needed on IPhone
#define OSG_LIBRARY_STATIC
#define OSG_USE_FLOAT_MATRIX
/* #undef OSG_USE_FLOAT_PLANE */
#define OSG_USE_FLOAT_BOUNDINGSPHERE
#define OSG_USE_FLOAT_BOUNDINGBOX
#define OSG_USE_REF_PTR_IMPLICIT_OUTPUT_CONVERSION
/* #undef OSG_USE_UTF8_FILENAME */
#define OSG_DISABLE_MSVC_WARNINGS
/* #undef OSG_GLU_AVAILABLE */
/* #undef OSG_GL1_AVAILABLE */
/* #undef OSG_GL2_AVAILABLE */
/* #undef OSG_GL3_AVAILABLE */
#define OSG_GLES1_AVAILABLE
/* #undef OSG_GLES2_AVAILABLE */
/* #undef OSG_GL_DISPLAYLISTS_AVAILABLE */
#define OSG_GL_MATRICES_AVAILABLE
#define OSG_GL_VERTEX_FUNCS_AVAILABLE
#define OSG_GL_VERTEX_ARRAY_FUNCS_AVAILABLE
#define OSG_GL_FIXED_FUNCTION_AVAILABLE
#endif
Any help is greatly appreciated,
Stephan
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