1 files changed, 48 insertions, 0 deletions
diff --git a/mozglue/misc/RWLock_windows.cpp b/mozglue/misc/RWLock_windows.cpp
new file mode 100644
index 0000000000..2c347f218c
--- /dev/null
+++ b/mozglue/misc/RWLock_windows.cpp
@@ -0,0 +1,48 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef XP_WIN
+#  error This file should only be compiled on Windows.
+#endif
+
+#include "mozilla/PlatformRWLock.h"
+
+#include <windows.h>
+
+#define NativeHandle(m) (reinterpret_cast<SRWLOCK*>(&m))
+
+mozilla::detail::RWLockImpl::RWLockImpl() {
+  static_assert(sizeof(SRWLOCK) <= sizeof(mRWLock), "SRWLOCK is too big!");
+  InitializeSRWLock(NativeHandle(mRWLock));
+}
+
+mozilla::detail::RWLockImpl::~RWLockImpl() {}
+
+bool mozilla::detail::RWLockImpl::tryReadLock() {
+  return TryAcquireSRWLockShared(NativeHandle(mRWLock));
+}
+
+void mozilla::detail::RWLockImpl::readLock() {
+  AcquireSRWLockShared(NativeHandle(mRWLock));
+}
+
+void mozilla::detail::RWLockImpl::readUnlock() {
+  ReleaseSRWLockShared(NativeHandle(mRWLock));
+}
+
+bool mozilla::detail::RWLockImpl::tryWriteLock() {
+  return TryAcquireSRWLockExclusive(NativeHandle(mRWLock));
+}
+
+void mozilla::detail::RWLockImpl::writeLock() {
+  AcquireSRWLockExclusive(NativeHandle(mRWLock));
+}
+
+void mozilla::detail::RWLockImpl::writeUnlock() {
+  ReleaseSRWLockExclusive(NativeHandle(mRWLock));
+}
+
+#undef NativeHandle