mirror of
https://github.com/kidfromjupiter/nearby.git
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79 lines
2.5 KiB
C++
79 lines
2.5 KiB
C++
// Copyright 2020 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef PLATFORM_PUBLIC_MUTEX_H_
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#define PLATFORM_PUBLIC_MUTEX_H_
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#include <memory>
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#include "absl/base/thread_annotations.h"
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#include "internal/platform/implementation/mutex.h"
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#include "internal/platform/implementation/platform.h"
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namespace nearby {
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#pragma push_macro("CreateMutex")
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#undef CreateMutex
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// This is a classic mutex can be acquired at most once.
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// Atttempt to acuire mutex from the same thread that is holding it will likely
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// cause a deadlock.
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class ABSL_LOCKABLE Mutex final {
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public:
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explicit Mutex(bool check = true)
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: impl_(api::ImplementationPlatform::CreateMutex(
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check ? api::Mutex::Mode::kRegular
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: api::Mutex::Mode::kRegularNoCheck)) {}
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Mutex(Mutex&&) = default;
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Mutex& operator=(Mutex&&) = default;
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~Mutex() = default;
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void Lock() ABSL_EXCLUSIVE_LOCK_FUNCTION() { impl_->Lock(); }
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void Unlock() ABSL_UNLOCK_FUNCTION() { impl_->Unlock(); }
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private:
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friend class ConditionVariable;
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friend class MutexLock;
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std::unique_ptr<api::Mutex> impl_;
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};
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// This mutex is compatible with Java definition:
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// https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/locks/Lock.html
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// This mutex may be acuired multiple times by a thread that is already holding
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// it without blocking.
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// It needs to be released equal number of times before any other thread could
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// successfully acquire it.
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class ABSL_LOCKABLE RecursiveMutex final {
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public:
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RecursiveMutex()
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: impl_(api::ImplementationPlatform::CreateMutex(
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api::Mutex::Mode::kRecursive)) {}
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RecursiveMutex(RecursiveMutex&&) = default;
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RecursiveMutex& operator=(RecursiveMutex&&) = default;
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~RecursiveMutex() = default;
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void Lock() ABSL_EXCLUSIVE_LOCK_FUNCTION() { impl_->Lock(); }
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void Unlock() ABSL_UNLOCK_FUNCTION() { impl_->Unlock(); }
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private:
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friend class MutexLock;
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std::unique_ptr<api::Mutex> impl_;
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};
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#pragma pop_macro("CreateMutex")
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} // namespace nearby
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#endif // PLATFORM_PUBLIC_MUTEX_H_
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