mozglue/misc/PlatformRWLock.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef mozilla_PlatformRWLock_h
   8 #define mozilla_PlatformRWLock_h
   9
  10 #include "mozilla/Types.h"
  11
  12 #ifndef XP_WIN
  13 #  include <pthread.h>
  14 #endif
  15
  16 namespace mozilla::detail {
  17
  18 class RWLockImpl {
  19  public:
  20   explicit MFBT_API RWLockImpl();
  21   MFBT_API ~RWLockImpl();
  22
  23  protected:
  24   [[nodiscard]] MFBT_API bool tryReadLock();
  25   MFBT_API void readLock();
  26   MFBT_API void readUnlock();
  27
  28   [[nodiscard]] MFBT_API bool tryWriteLock();
  29   MFBT_API void writeLock();
  30   MFBT_API void writeUnlock();
  31
  32  private:
  33   RWLockImpl(const RWLockImpl&) = delete;
  34   void operator=(const RWLockImpl&) = delete;
  35   RWLockImpl(RWLockImpl&&) = delete;
  36   void operator=(RWLockImpl&&) = delete;
  37   bool operator==(const RWLockImpl& rhs) = delete;
  38
  39 #ifndef XP_WIN
  40   pthread_rwlock_t mRWLock;
  41 #else
  42   // SRWLock is pointer-sized. We declare it in such a fashion here to avoid
  43   // pulling in windows.h wherever this header is used.
  44   void* mRWLock;
  45 #endif
  46 };
  47
  48 }  // namespace mozilla::detail
  49
  50 #endif  // mozilla_PlatformRWLock_h