1 files changed, 66 insertions, 0 deletions
diff --git a/mozglue/misc/PlatformMutex.h b/mozglue/misc/PlatformMutex.h
new file mode 100644
index 0000000000..ac5459cf10
--- /dev/null
+++ b/mozglue/misc/PlatformMutex.h
@@ -0,0 +1,66 @@
+/* -*- 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