| // Copyright 2016 The Chromium Authors |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef MOJO_PUBLIC_CPP_BINDINGS_LIB_MAY_AUTO_LOCK_H_ |
| #define MOJO_PUBLIC_CPP_BINDINGS_LIB_MAY_AUTO_LOCK_H_ |
| |
| #include "base/component_export.h" |
| #include "base/memory/raw_ptr_exclusion.h" |
| #include "base/synchronization/lock.h" |
| #include "third_party/abseil-cpp/absl/types/optional.h" |
| |
| namespace mojo { |
| namespace internal { |
| |
| // Similar to base::AutoLock, except that it does nothing if |lock| passed into |
| // the constructor is null. |
| class COMPONENT_EXPORT(MOJO_CPP_BINDINGS_BASE) MayAutoLock { |
| public: |
| explicit MayAutoLock(absl::optional<base::Lock>* lock) |
| : lock_(lock->has_value() ? &lock->value() : nullptr) { |
| if (lock_) |
| lock_->Acquire(); |
| } |
| |
| MayAutoLock(const MayAutoLock&) = delete; |
| MayAutoLock& operator=(const MayAutoLock&) = delete; |
| |
| ~MayAutoLock() { |
| if (lock_) { |
| lock_->AssertAcquired(); |
| lock_->Release(); |
| } |
| } |
| |
| private: |
| // `lock_` is not a raw_ptr<...> for performance reasons: on-stack pointer + |
| // based on analysis of sampling profiler data. |
| RAW_PTR_EXCLUSION base::Lock* lock_; |
| }; |
| |
| // Similar to base::AutoUnlock, except that it does nothing if |lock| passed |
| // into the constructor is null. |
| class COMPONENT_EXPORT(MOJO_CPP_BINDINGS_BASE) MayAutoUnlock { |
| public: |
| explicit MayAutoUnlock(absl::optional<base::Lock>* lock) |
| : lock_(lock->has_value() ? &lock->value() : nullptr) { |
| if (lock_) { |
| lock_->AssertAcquired(); |
| lock_->Release(); |
| } |
| } |
| |
| MayAutoUnlock(const MayAutoUnlock&) = delete; |
| MayAutoUnlock& operator=(const MayAutoUnlock&) = delete; |
| |
| ~MayAutoUnlock() { |
| if (lock_) |
| lock_->Acquire(); |
| } |
| |
| private: |
| // `lock_` is not a raw_ptr<...> for performance reasons: on-stack pointer + |
| // based on analysis of sampling profiler data. |
| RAW_PTR_EXCLUSION base::Lock* lock_; |
| }; |
| |
| } // namespace internal |
| } // namespace mojo |
| |
| #endif // MOJO_PUBLIC_CPP_BINDINGS_LIB_MAY_AUTO_LOCK_H_ |