1 files changed, 51 insertions, 0 deletions
diff --git a/contrib/llvm/lib/Support/Unix/RWMutex.inc b/contrib/llvm/lib/Support/Unix/RWMutex.inc
new file mode 100644
index 0000000..85a1043
--- /dev/null
+++ b/contrib/llvm/lib/Support/Unix/RWMutex.inc
@@ -0,0 +1,51 @@
+//= llvm/Support/Unix/RWMutex.inc - Unix Reader/Writer Mutual Exclusion Lock  =//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the Unix specific (non-pthread) RWMutex class.
+//
+//===----------------------------------------------------------------------===//
+
+//===----------------------------------------------------------------------===//
+//=== WARNING: Implementation here must contain only generic UNIX code that
+//===          is guaranteed to work on *all* UNIX variants.
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Support/Mutex.h"
+
+namespace llvm {
+
+using namespace sys;
+
+// This naive implementation treats readers the same as writers.  This
+// will therefore deadlock if a thread tries to acquire a read lock
+// multiple times.
+
+RWMutexImpl::RWMutexImpl() : data_(new MutexImpl(false)) { }
+
+RWMutexImpl::~RWMutexImpl() {
+  delete static_cast<MutexImpl *>(data_);
+}
+
+bool RWMutexImpl::reader_acquire() {
+  return static_cast<MutexImpl *>(data_)->acquire();
+}
+
+bool RWMutexImpl::reader_release() {
+  return static_cast<MutexImpl *>(data_)->release();
+}
+
+bool RWMutexImpl::writer_acquire() {
+  return static_cast<MutexImpl *>(data_)->acquire();
+}
+
+bool RWMutexImpl::writer_release() {
+  return static_cast<MutexImpl *>(data_)->release();
+}
+
+}