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-rw-r--r--mozglue/misc/PlatformRWLock.h50
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diff --git a/mozglue/misc/PlatformRWLock.h b/mozglue/misc/PlatformRWLock.h
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+/* -*- 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 mozilla_PlatformRWLock_h
+#define mozilla_PlatformRWLock_h
+
+#include "mozilla/Types.h"
+
+#ifndef XP_WIN
+# include <pthread.h>
+#endif
+
+namespace mozilla::detail {
+
+class RWLockImpl {
+ public:
+ explicit MFBT_API RWLockImpl();
+ MFBT_API ~RWLockImpl();
+
+ protected:
+ [[nodiscard]] MFBT_API bool tryReadLock();
+ MFBT_API void readLock();
+ MFBT_API void readUnlock();
+
+ [[nodiscard]] MFBT_API bool tryWriteLock();
+ MFBT_API void writeLock();
+ MFBT_API void writeUnlock();
+
+ private:
+ RWLockImpl(const RWLockImpl&) = delete;
+ void operator=(const RWLockImpl&) = delete;
+ RWLockImpl(RWLockImpl&&) = delete;
+ void operator=(RWLockImpl&&) = delete;
+ bool operator==(const RWLockImpl& rhs) = delete;
+
+#ifndef XP_WIN
+ pthread_rwlock_t mRWLock;
+#else
+ // SRWLock is pointer-sized. We declare it in such a fashion here to avoid
+ // pulling in windows.h wherever this header is used.
+ void* mRWLock;
+#endif
+};
+
+} // namespace mozilla::detail
+
+#endif // mozilla_PlatformRWLock_h