levelDB-LAB1-pzy_ckx/port/thread_annotations.h

// Copyright (c) 2012 The LevelDB Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file. See the AUTHORS file for names of contributors.

#ifndef STORAGE_LEVELDB_PORT_THREAD_ANNOTATIONS_H_
#define STORAGE_LEVELDB_PORT_THREAD_ANNOTATIONS_H_

// Use Clang's thread safety analysis annotations when available. In other
// environments, the macros receive empty definitions.
// Usage documentation: https://clang.llvm.org/docs/ThreadSafetyAnalysis.html

#if !defined(THREAD_ANNOTATION_ATTRIBUTE__)

#if defined(__clang__)

#define THREAD_ANNOTATION_ATTRIBUTE__(x)   __attribute__((x))
#else
#define THREAD_ANNOTATION_ATTRIBUTE__(x)   // no-op
#endif

#endif  // !defined(THREAD_ANNOTATION_ATTRIBUTE__)

#ifndef GUARDED_BY
#define GUARDED_BY(x) THREAD_ANNOTATION_ATTRIBUTE__(guarded_by(x))
#endif

#ifndef PT_GUARDED_BY
#define PT_GUARDED_BY(x) THREAD_ANNOTATION_ATTRIBUTE__(pt_guarded_by(x))
#endif

#ifndef ACQUIRED_AFTER
#define ACQUIRED_AFTER(...) \
  THREAD_ANNOTATION_ATTRIBUTE__(acquired_after(__VA_ARGS__))
#endif

#ifndef ACQUIRED_BEFORE
#define ACQUIRED_BEFORE(...) \
  THREAD_ANNOTATION_ATTRIBUTE__(acquired_before(__VA_ARGS__))
#endif

#ifndef EXCLUSIVE_LOCKS_REQUIRED
#define EXCLUSIVE_LOCKS_REQUIRED(...) \
  THREAD_ANNOTATION_ATTRIBUTE__(exclusive_locks_required(__VA_ARGS__))
#endif

#ifndef SHARED_LOCKS_REQUIRED
#define SHARED_LOCKS_REQUIRED(...) \
  THREAD_ANNOTATION_ATTRIBUTE__(shared_locks_required(__VA_ARGS__))
#endif

#ifndef LOCKS_EXCLUDED
#define LOCKS_EXCLUDED(...) \
  THREAD_ANNOTATION_ATTRIBUTE__(locks_excluded(__VA_ARGS__))
#endif

#ifndef LOCK_RETURNED
#define LOCK_RETURNED(x) \
  THREAD_ANNOTATION_ATTRIBUTE__(lock_returned(x))
#endif

#ifndef LOCKABLE
#define LOCKABLE \
  THREAD_ANNOTATION_ATTRIBUTE__(lockable)
#endif

#ifndef SCOPED_LOCKABLE
#define SCOPED_LOCKABLE \
  THREAD_ANNOTATION_ATTRIBUTE__(scoped_lockable)
#endif

#ifndef EXCLUSIVE_LOCK_FUNCTION
#define EXCLUSIVE_LOCK_FUNCTION(...) \
  THREAD_ANNOTATION_ATTRIBUTE__(exclusive_lock_function(__VA_ARGS__))
#endif

#ifndef SHARED_LOCK_FUNCTION
#define SHARED_LOCK_FUNCTION(...) \
  THREAD_ANNOTATION_ATTRIBUTE__(shared_lock_function(__VA_ARGS__))
#endif

#ifndef EXCLUSIVE_TRYLOCK_FUNCTION
#define EXCLUSIVE_TRYLOCK_FUNCTION(...) \
  THREAD_ANNOTATION_ATTRIBUTE__(exclusive_trylock_function(__VA_ARGS__))
#endif

#ifndef SHARED_TRYLOCK_FUNCTION
#define SHARED_TRYLOCK_FUNCTION(...) \
  THREAD_ANNOTATION_ATTRIBUTE__(shared_trylock_function(__VA_ARGS__))
#endif

#ifndef UNLOCK_FUNCTION
#define UNLOCK_FUNCTION(...) \
  THREAD_ANNOTATION_ATTRIBUTE__(unlock_function(__VA_ARGS__))
#endif

#ifndef NO_THREAD_SAFETY_ANALYSIS
#define NO_THREAD_SAFETY_ANALYSIS \
  THREAD_ANNOTATION_ATTRIBUTE__(no_thread_safety_analysis)
#endif

#ifndef ASSERT_EXCLUSIVE_LOCK
#define ASSERT_EXCLUSIVE_LOCK(...) \
  THREAD_ANNOTATION_ATTRIBUTE__(assert_exclusive_lock(__VA_ARGS__))
#endif

#ifndef ASSERT_SHARED_LOCK
#define ASSERT_SHARED_LOCK(...) \
  THREAD_ANNOTATION_ATTRIBUTE__(assert_shared_lock(__VA_ARGS__))
#endif

#endif  // STORAGE_LEVELDB_PORT_THREAD_ANNOTATIONS_H_