commit 5765f4c24cc44129f63926ec5f2752aab1619f45
author Jordy Rose <jediknil@belkadan.com> Mon Aug 22 19:01:52 2011 +0000
committer Jordy Rose <jediknil@belkadan.com> Mon Aug 22 19:01:52 2011 +0000
tree 10aecf66da51a60431781bb6ee4248485386e156
parent 752de1443f5c2cb3e06c06f2e2e6c9d50ec4d119

Make DynamicLibrary thread-safe w/r/t call to dlerror() after dlopen(). PR10718

llvm-svn: 138260

llvm/lib/Support/DynamicLibrary.cpp

diff --git a/llvm/lib/Support/DynamicLibrary.cpp b/llvm/lib/Support/DynamicLibrary.cpp
index 5ee6a82..fb02c07 100644
--- a/llvm/lib/Support/DynamicLibrary.cpp
+++ b/llvm/lib/Support/DynamicLibrary.cpp
@@ -72,6 +72,8 @@
 
 DynamicLibrary DynamicLibrary::getPermanentLibrary(const char *filename,
                                                    std::string *errMsg) {
+  SmartScopedLock<true> lock(getMutex());
+
   void *handle = dlopen(filename, RTLD_LAZY|RTLD_GLOBAL);
   if (handle == 0) {
     if (errMsg) *errMsg = dlerror();
@@ -85,7 +87,6 @@
     handle = RTLD_DEFAULT;
 #endif
 
-  SmartScopedLock<true> lock(getMutex());
   if (OpenedHandles == 0)
     OpenedHandles = new DenseSet<void *>();