145 lines
4.5 KiB
C++
145 lines
4.5 KiB
C++
/*
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* Copyright (C) 2016 The Android Open Source Project
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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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* http://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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*/
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#pragma once
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#include <mutex>
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#define THREAD_ANNOTATION_ATTRIBUTE__(x) __attribute__((x))
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#define CAPABILITY(x) \
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THREAD_ANNOTATION_ATTRIBUTE__(capability(x))
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#define SCOPED_CAPABILITY \
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THREAD_ANNOTATION_ATTRIBUTE__(scoped_lockable)
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#define SHARED_CAPABILITY(...) \
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THREAD_ANNOTATION_ATTRIBUTE__(shared_capability(__VA_ARGS__))
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#define GUARDED_BY(x) \
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THREAD_ANNOTATION_ATTRIBUTE__(guarded_by(x))
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#define PT_GUARDED_BY(x) \
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THREAD_ANNOTATION_ATTRIBUTE__(pt_guarded_by(x))
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#define EXCLUSIVE_LOCKS_REQUIRED(...) \
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THREAD_ANNOTATION_ATTRIBUTE__(exclusive_locks_required(__VA_ARGS__))
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#define SHARED_LOCKS_REQUIRED(...) \
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THREAD_ANNOTATION_ATTRIBUTE__(shared_locks_required(__VA_ARGS__))
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#define ACQUIRED_BEFORE(...) \
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THREAD_ANNOTATION_ATTRIBUTE__(acquired_before(__VA_ARGS__))
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#define ACQUIRED_AFTER(...) \
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THREAD_ANNOTATION_ATTRIBUTE__(acquired_after(__VA_ARGS__))
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#define REQUIRES(...) \
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THREAD_ANNOTATION_ATTRIBUTE__(requires_capability(__VA_ARGS__))
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#define REQUIRES_SHARED(...) \
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THREAD_ANNOTATION_ATTRIBUTE__(requires_shared_capability(__VA_ARGS__))
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#define ACQUIRE(...) \
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THREAD_ANNOTATION_ATTRIBUTE__(acquire_capability(__VA_ARGS__))
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#define ACQUIRE_SHARED(...) \
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THREAD_ANNOTATION_ATTRIBUTE__(acquire_shared_capability(__VA_ARGS__))
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#define RELEASE(...) \
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THREAD_ANNOTATION_ATTRIBUTE__(release_capability(__VA_ARGS__))
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#define RELEASE_SHARED(...) \
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THREAD_ANNOTATION_ATTRIBUTE__(release_shared_capability(__VA_ARGS__))
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#define TRY_ACQUIRE(...) \
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THREAD_ANNOTATION_ATTRIBUTE__(try_acquire_capability(__VA_ARGS__))
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#define TRY_ACQUIRE_SHARED(...) \
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THREAD_ANNOTATION_ATTRIBUTE__(try_acquire_shared_capability(__VA_ARGS__))
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#define EXCLUDES(...) \
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THREAD_ANNOTATION_ATTRIBUTE__(locks_excluded(__VA_ARGS__))
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#define ASSERT_CAPABILITY(x) \
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THREAD_ANNOTATION_ATTRIBUTE__(assert_capability(x))
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#define ASSERT_SHARED_CAPABILITY(x) \
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THREAD_ANNOTATION_ATTRIBUTE__(assert_shared_capability(x))
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#define RETURN_CAPABILITY(x) \
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THREAD_ANNOTATION_ATTRIBUTE__(lock_returned(x))
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#define EXCLUSIVE_LOCK_FUNCTION(...) \
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THREAD_ANNOTATION_ATTRIBUTE__(exclusive_lock_function(__VA_ARGS__))
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#define EXCLUSIVE_TRYLOCK_FUNCTION(...) \
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THREAD_ANNOTATION_ATTRIBUTE__(exclusive_trylock_function(__VA_ARGS__))
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#define SHARED_LOCK_FUNCTION(...) \
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THREAD_ANNOTATION_ATTRIBUTE__(shared_lock_function(__VA_ARGS__))
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#define SHARED_TRYLOCK_FUNCTION(...) \
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THREAD_ANNOTATION_ATTRIBUTE__(shared_trylock_function(__VA_ARGS__))
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#define UNLOCK_FUNCTION(...) \
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THREAD_ANNOTATION_ATTRIBUTE__(unlock_function(__VA_ARGS__))
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#define SCOPED_LOCKABLE \
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THREAD_ANNOTATION_ATTRIBUTE__(scoped_lockable)
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#define LOCK_RETURNED(x) \
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THREAD_ANNOTATION_ATTRIBUTE__(lock_returned(x))
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#define NO_THREAD_SAFETY_ANALYSIS \
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THREAD_ANNOTATION_ATTRIBUTE__(no_thread_safety_analysis)
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namespace android {
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namespace base {
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// A class to help thread safety analysis deal with std::unique_lock and condition_variable.
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//
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// Clang's thread safety analysis currently doesn't perform alias analysis, so movable types
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// like std::unique_lock can't be marked with thread safety annotations. This helper allows
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// for manual assertion of lock state in a scope.
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//
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// For example:
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//
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// std::mutex mutex;
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// std::condition_variable cv;
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// std::vector<int> vec GUARDED_BY(mutex);
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//
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// int pop() {
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// std::unique_lock lock(mutex);
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// ScopedLockAssertion lock_assertion(mutex);
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// cv.wait(lock, []() {
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// ScopedLockAssertion lock_assertion(mutex);
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// return !vec.empty();
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// });
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//
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// int result = vec.back();
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// vec.pop_back();
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// return result;
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// }
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class SCOPED_CAPABILITY ScopedLockAssertion {
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public:
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ScopedLockAssertion(std::mutex& mutex) ACQUIRE(mutex) {}
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~ScopedLockAssertion() RELEASE() {}
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};
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} // namespace base
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} // namespace android
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