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-rw-r--r--lib/System/RWMutex.cpp7
1 files changed, 7 insertions, 0 deletions
diff --git a/lib/System/RWMutex.cpp b/lib/System/RWMutex.cpp
index cf1aea03dd..15d98cb8f4 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 @@ RWMutexImpl::RWMutexImpl()
// 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