Workaround for an... interesting bug in Darwin's pthread_rwlock_init.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73806 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/System/RWMutex.cpp b/lib/System/RWMutex.cpp
index cf1aea0..15d98cb 100644
--- a/lib/System/RWMutex.cpp
+++ b/lib/System/RWMutex.cpp
@@ -13,6 +13,7 @@
#include "llvm/Config/config.h"
#include "llvm/System/RWMutex.h"
+#include <cstring>
//===----------------------------------------------------------------------===//
//=== WARNING: Implementation here must contain only TRULY operating system
@@ -64,6 +65,12 @@
// Declare the pthread_rwlock data structures
pthread_rwlock_t* rwlock =
static_cast<pthread_rwlock_t*>(malloc(sizeof(pthread_rwlock_t)));
+
+#ifdef __APPLE__
+ // Workaround a bug/mis-feature in Darwin's pthread_rwlock_init.
+ bzero(rwlock, sizeof(pthread_rwlock_t));
+#endif
+
pthread_rwlockattr_t attr;
// Initialize the rwlock attributes