Hi,
I am porting a small project that is still in starting stages from using
irrlicht to osg (because osg seems more professional)
However I encountered a problem:
I'm using some custom multithreading (windows thread + mutex + event), to start
a second thread that handles the generation and/or loading of chunks, so that
the main thread can keep running at normal speed. I have CPU cores in my PC.
Now it used to work fine, the chunks would generate/load without slowing down
the rendering etc. of the main thread, but currently when using OSG the main
thread slows down when the second thread is generating/loading chunks.
So it seems that it does not run it in a seperate thread at all, or that it
runs it at the same core or something. Any idea why this is, or what I could do
to check things, or fix it?
Code:
chunkRequest_mutex = CreateMutex( NULL, // no security attributes
false, // BOOL
bInitialOwner, we don't want the
// thread that creates the mutex to
// immediately own it.
"ChunkRequestMutex" //
lpName
);
if ( chunkRequest_mutex == NULL )
{
OutputDebugString("CreateMutex() failed for request\n" );
}
else OutputDebugString("CreateMutex() success for request\n" );
chunkRequest_event = CreateEvent( NULL, // no security attributes
FALSE, // auto-reset event
FALSE, // initial state is
non-signaled
"ChunkRequestEvent" ); //
lpName
if (chunkRequest_event == NULL)
{
OutputDebugString("CreateEvent() failed for request\n");
}
else OutputDebugString("CreateEvent() success for request\n" );
chunkCreated_mutex = CreateMutex( NULL, // no security attributes
false, // BOOL
bInitialOwner, we don't want the
// thread that creates the mutex to
// immediately own it.
"ChunkCreatedMutex" //
lpName
);
if ( chunkRequest_mutex == NULL )
{
OutputDebugString("CreateMutex() 2 failed for request\n" );
}
else OutputDebugString("CreateMutex() 2 success for request\n" );
//create and start thread
HANDLE chunkHandle;
unsigned chunkThreadID;
DWORD dwExitCode;
chunkHandle = (HANDLE)_beginthreadex( NULL,
0,
handleChunkRequests,
NULL,
CREATE_SUSPENDED, // so we can later
call ResumeThread()
&chunkThreadID );
if ( chunkHandle == 0 )
printf("Failed to create consumer thread\n");
GetExitCodeThread( chunkHandle, &dwExitCode ); // should be STILL_ACTIVE =
0x00000103 = 259
printf( "initial Consumer thread exit code = %u\n", dwExitCode );
ResumeThread( chunkHandle ); //
Thank you!
Cheers,
Bram
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=52842#52842
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