mozglue/misc/PlatformMutex.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_PlatformMutex_h
   8 #define mozilla_PlatformMutex_h
   9
  10 #include <utility>
  11
  12 #include "mozilla/Attributes.h"
  13
  14 #if !defined(XP_WIN)
  15 #  include <pthread.h>
  16 #endif
  17
  18 namespace mozilla {
  19
  20 namespace detail {
  21
  22 class ConditionVariableImpl;
  23
  24 class MutexImpl {
  25  public:
  26   struct PlatformData;
  27
  28   explicit MFBT_API MutexImpl();
  29   MFBT_API ~MutexImpl();
  30
  31  protected:
  32   MFBT_API void lock();
  33   MFBT_API void unlock();
  34   // We have a separate, forwarding API so internal uses don't have to go
  35   // through the PLT.
  36   MFBT_API bool tryLock();
  37
  38  private:
  39   MutexImpl(const MutexImpl&) = delete;
  40   void operator=(const MutexImpl&) = delete;
  41   MutexImpl(MutexImpl&&) = delete;
  42   void operator=(MutexImpl&&) = delete;
  43   bool operator==(const MutexImpl& rhs) = delete;
  44
  45   void mutexLock();
  46   bool mutexTryLock();
  47
  48   PlatformData* platformData();
  49
  50 #if !defined(XP_WIN)
  51   void* platformData_[sizeof(pthread_mutex_t) / sizeof(void*)];
  52   static_assert(sizeof(pthread_mutex_t) / sizeof(void*) != 0 &&
  53                     sizeof(pthread_mutex_t) % sizeof(void*) == 0,
  54                 "pthread_mutex_t must have pointer alignment");
  55 #else
  56   void* platformData_[6];
  57 #endif
  58
  59   friend class mozilla::detail::ConditionVariableImpl;
  60 };
  61
  62 }  // namespace detail
  63
  64 }  // namespace mozilla
  65
  66 #endif  // mozilla_PlatformMutex_h