PlatformMutex.h - mozsearch

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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_PlatformMutex_h

#define mozilla_PlatformMutex_h

#include <utility>

#include "mozilla/Attributes.h"

#include "mozilla/Types.h"

#if !defined(XP_WIN) && !defined(__wasi__)

#  include <pthread.h>

#endif

namespace mozilla {

namespace detail {

class ConditionVariableImpl;

class MutexImpl {

 public:

  struct PlatformData;

  explicit MFBT_API MutexImpl();

  MFBT_API ~MutexImpl();

 protected:

  MFBT_API void lock();

  MFBT_API void unlock();

  // We have a separate, forwarding API so internal uses don't have to go

  // through the PLT.

  MFBT_API bool tryLock();

 private:

  MutexImpl(const MutexImpl&) = delete;

  void operator=(const MutexImpl&) = delete;

  MutexImpl(MutexImpl&&) = delete;

  void operator=(MutexImpl&&) = delete;

  bool operator==(const MutexImpl& rhs) = delete;

  void mutexLock();

  bool mutexTryLock();

  PlatformData* platformData();

#if !defined(XP_WIN) && !defined(__wasi__)

  void* platformData_[sizeof(pthread_mutex_t) / sizeof(void*)];

  static_assert(sizeof(pthread_mutex_t) / sizeof(void*) != 0 &&

                    sizeof(pthread_mutex_t) % sizeof(void*) == 0,

                "pthread_mutex_t must have pointer alignment");

#else

  void* platformData_[6];

#endif

  friend class mozilla::detail::ConditionVariableImpl;

};

}  // namespace detail

}  // namespace mozilla

#endif  // mozilla_PlatformMutex_h