Question

I have a very strange problem in my code. I’m using Ogre and I’m trying to manually create a material but I don’t think the problem is Ogre specific. Links: Header file, Source file, Stack trace. Please excuse random names, comments and std::cout <<‘s. I am in despair and enjoy fun coding 😀

Here is a summary of my code if you don’t wish to read it:

1. Create root
2. Load plugins
3. Setup render system
4. Load resources
5. Setup input system
6. Create scene manager
7. Create scene
   a. Setup lighting
   b. Manually create material
   c. Add entity to scene with manually created material
8. Add frame update callback
9. Begin rendering

Now, If I omit steps 7b and 7c, the code works fine and as expected, and the program outputs to a log, as expected. But if I include steps 7b and 7c, nothing happens and no log is written. The code never finishes step one. I believe this is a deadlock from looking at the stack trace but have no idea how to solve it – I don’t understand how adding code later on will affect code earlier on as it will run after the initial code, this is why I suspected a threading issue. Any suggestions welcome! Thanks in advance, ell.

Edit: Removed most code, leaving in only steps 1, 7a, 7b and 7c. I’m leaving the stack trace in because its not so long!

Here is the offending code:

Step 1 (line 13)

mRoot = new Ogre::Root("", "", "ogre.log");

Steps 7a,b,c (lines 146-169)

mSceneManager->setAmbientLight(Ogre::ColourValue(0.5, 0.5, 0.5));

std::cout << "Before material creation" << std::endl;


//Make cube material
Ogre::MaterialPtr cube_material_ptr = Ogre::MaterialManager::getSingleton().create(
    "trolcherry",
    Ogre::ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME
    );
std::cout << "After material creation" << std::endl;

// Get a material pass
Ogre::Pass *pass = cube_material_ptr->getTechnique(0)->getPass(0);
pass->setDiffuse(Ogre::ColourValue(1.0, 0.2, 0.2));


//Make cube
Ogre::Entity& cube_entity = *(mSceneManager->createEntity("Head", "Prefab_Cube"));
cube_entity.setMaterialName("trolcherry");

Ogre::SceneNode& cube_node = *(mSceneManager->getRootSceneNode()->createChildSceneNode());
cube_node.attachObject(&cube_entity);
cube_node.scale(0.3, 0.3, 0.3);

Stack trace

#0 (    0x0012e416 in __kernel_vsyscall() (??:??)
#1 0x9b20b9 __lll_lock_wait() (../nptl/sysdeps/unix/sysv/linux/i386/i686/../i486/lowlevellock.S:142)
#2 0x9af566 pthread_cond_wait@@GLIBC_2.3.2() (../nptl/sysdeps/unix/sysv/linux/i386/i686/../i486/pthread_cond_wait.S:299)
#3 0x9223fd __pthread_cond_wait(cond=0xb7bd727c, mutex=0xb7bd7264) (forward.c:139)
#4 0x804c65b    boost::recursive_mutex::lock(this=0xb7bd7264) (lib/boost_1_47_0/boost/thread/pthread/recursive_mutex.hpp:133)
#5 0x804d4af    boost::unique_lock<boost::recursive_mutex>::lock(this=0xbffff3c4) (lib/boost_1_47_0/boost/thread/locks.hpp:412)
#6 0x47dd96 unique_lock(this=0xb7bd7260, name=..., inGlobalPool=true) (/usr/include/boost/thread/locks.hpp:227)
#7 (    Ogre::ResourceGroupManager::createResourceGroup(this=0xb7bd7260, name=..., inGlobalPool=true) (/home/elliot/Programming/C and C++/Project MuffinSnatcher/lib/ogre_src_v1-7-3/OgreMain/src/OgreResourceGroupManager.cpp:84)
#8 0x47eaa6 Ogre::ResourceGroupManager::ResourceGroupManager(this=0xb7bd7260) (/home/elliot/Programming/C and C++/Project MuffinSnatcher/lib/ogre_src_v1-7-3/OgreMain/src/OgreResourceGroupManager.cpp:61)
#9 0x497bc2 Ogre::Root::Root(this=0xb7ed7260, pluginFileName=..., configFileName=..., logFileName=...) (/home/elliot/Programming/C and C++/Project MuffinSnatcher/lib/ogre_src_v1-7-3/OgreMain/src/OgreRoot.cpp:154)
#10 0x804adfe   ProjectMuffinSnatcher::Client::Run(this=0xbffff6ec) (/home/elliot/Programming/C and C++/Project MuffinSnatcher/src/Client.cpp:13)
#11 0x804e0da   main() (/home/elliot/Programming/C and C++/Project MuffinSnatcher/src/main.cpp:6)

Output of ldd

linux-gate.so.1 =>  (0x009a3000)
libboost_system.so.1.42.0 => /usr/lib/libboost_system.so.1.42.0 (0x00c14000)
libOgreMain.so.1.7.3 => /usr/local/lib/libOgreMain.so.1.7.3 (0x00110000)
libOIS-1.3.0.so => /usr/local/lib/libOIS-1.3.0.so (0x006d3000)
libstdc++.so.6 => /usr/lib/i386-linux-gnu/libstdc++.so.6 (0x00ce8000)
libm.so.6 => /lib/i386-linux-gnu/libm.so.6 (0x006f4000)
libgcc_s.so.1 => /lib/i386-linux-gnu/libgcc_s.so.1 (0x00f66000)
libc.so.6 => /lib/i386-linux-gnu/libc.so.6 (0x0071a000)
libpthread.so.0 => /lib/i386-linux-gnu/libpthread.so.0 (0x0087b000)
librt.so.1 => /lib/i386-linux-gnu/librt.so.1 (0x00e7b000)
libfreetype.so.6 => /usr/lib/i386-linux-gnu/libfreetype.so.6 (0x008da000)
libSM.so.6 => /usr/lib/i386-linux-gnu/libSM.so.6 (0x00e2d000)
libICE.so.6 => /usr/lib/i386-linux-gnu/libICE.so.6 (0x00894000)
libX11.so.6 => /usr/lib/i386-linux-gnu/libX11.so.6 (0x009a4000)
libXext.so.6 => /usr/lib/i386-linux-gnu/libXext.so.6 (0x008ac000)
libXt.so.6 => /usr/lib/i386-linux-gnu/libXt.so.6 (0x00abf000)
libXaw.so.7 => /usr/lib/libXaw.so.7 (0x00b11000)
libdl.so.2 => /lib/i386-linux-gnu/libdl.so.2 (0x008bb000)
libboost_thread.so.1.42.0 => /usr/lib/libboost_thread.so.1.42.0 (0x008bf000)
libboost_date_time.so.1.42.0 => /usr/lib/libboost_date_time.so.1.42.0 (0x00960000)
libfreeimage.so.3 => /usr/lib/libfreeimage.so.3 (0x00f82000)
libzzip-0.so.13 => /usr/lib/libzzip-0.so.13 (0x00973000)
libz.so.1 => /lib/i386-linux-gnu/libz.so.1 (0x0097a000)
/lib/ld-linux.so.2 (0x00c2e000)
libuuid.so.1 => /lib/i386-linux-gnu/libuuid.so.1 (0x008d4000)
libxcb.so.1 => /usr/lib/i386-linux-gnu/libxcb.so.1 (0x00b6e000)
libXmu.so.6 => /usr/lib/libXmu.so.6 (0x00b87000)
libXpm.so.4 => /usr/lib/libXpm.so.4 (0x0098f000)
libXau.so.6 => /usr/lib/i386-linux-gnu/libXau.so.6 (0x00b9d000)
libXdmcp.so.6 => /usr/lib/i386-linux-gnu/libXdmcp.so.6 (0x00ba1000)

Answer 1

I’ve finally fixed my problem. I deleted all boost & ogre related libraries and recompiled boost and then ogre and reinstalled them. Now things work fine (apparently!). Thanks for all the help but I guess a fresh reinstall is all I needed. Few, I’m glad that’s over!