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