After obtaining the lock, look if the function has been codegen'd by
another thread.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73227 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/ExecutionEngine/JIT/JIT.cpp b/lib/ExecutionEngine/JIT/JIT.cpp
index f8ae884..43995cb 100644
--- a/lib/ExecutionEngine/JIT/JIT.cpp
+++ b/lib/ExecutionEngine/JIT/JIT.cpp
@@ -563,6 +563,11 @@
return Addr; // Check if function already code gen'd
MutexGuard locked(lock);
+
+ // Now that this thread owns the lock, check if another thread has already
+ // code gen'd the function.
+ if (void *Addr = getPointerToGlobalIfAvailable(F))
+ return Addr;
// Make sure we read in the function if it exists in this Module.
if (F->hasNotBeenReadFromBitcode()) {