Make sure only one thread access mPendingLOD at a time.

1 files changed, 3 insertions, 1 deletions

diff --git a/indra/newview/llmeshrepository.cpp b/indra/newview/llmeshrepository.cpp
index bc7f522848..52077c620f 100755
--- a/indra/newview/llmeshrepository.cpp
+++ b/indra/newview/llmeshrepository.cpp
@@ -1097,11 +1097,13 @@ bool LLMeshRepoThread::headerReceived(const LLVolumeParams& mesh_params, U8* dat
 			mMeshHeader[mesh_id] = header;
 			}
 
+
+		LLMutexLock lock(mMutex); // make sure only one thread access mPendingLOD at the same time.
+
 		//check for pending requests
 		pending_lod_map::iterator iter = mPendingLOD.find(mesh_params);
 		if (iter != mPendingLOD.end())
 		{
-			LLMutexLock lock(mMutex);
 			for (U32 i = 0; i < iter->second.size(); ++i)
 			{
 				LODRequest req(mesh_params, iter->second[i]);