Fix PR8441, a thread unsafe static variable in our dynamic library loading facilities.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118463 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/System/DynamicLibrary.cpp b/lib/System/DynamicLibrary.cpp
index 660db49..3da50a2 100644
--- a/lib/System/DynamicLibrary.cpp
+++ b/lib/System/DynamicLibrary.cpp
@@ -15,6 +15,7 @@
//===----------------------------------------------------------------------===//
#include "llvm/System/DynamicLibrary.h"
+#include "llvm/System/Mutex.h"
#include "llvm/Config/config.h"
#include <cstdio>
#include <cstring>
@@ -60,6 +61,7 @@
//=== independent code.
//===----------------------------------------------------------------------===//
+static SmartMutex<true> HandlesMutex;
static std::vector<void *> *OpenedHandles = 0;
@@ -76,6 +78,7 @@
if (Filename == NULL)
H = RTLD_DEFAULT;
#endif
+ SmartScopedLock<true> Lock(HandlesMutex);
if (OpenedHandles == 0)
OpenedHandles = new std::vector<void *>();
OpenedHandles->push_back(H);
@@ -110,6 +113,7 @@
#if HAVE_DLFCN_H
// Now search the libraries.
+ SmartScopedLock<true> Lock(HandlesMutex);
if (OpenedHandles) {
for (std::vector<void *>::iterator I = OpenedHandles->begin(),
E = OpenedHandles->end(); I != E; ++I) {