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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2012 The Bitcoin developers
// Distributed under the MIT/X11 software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#ifndef BITCOIN_THREADSAFETY_H
#define BITCOIN_THREADSAFETY_H
#ifdef __clang__
// TL;DR Add GUARDED_BY(mutex) to member variables. The others are
// rarely necessary. Ex: int nFoo GUARDED_BY(cs_foo);
//
// See http://clang.llvm.org/docs/LanguageExtensions.html#threadsafety
// for documentation. The clang compiler can do advanced static analysis
// of locking when given the -Wthread-safety option.
#define LOCKABLE __attribute__ ((lockable))
#define SCOPED_LOCKABLE __attribute__ ((scoped_lockable))
#define GUARDED_BY(x) __attribute__ ((guarded_by(x)))
#define GUARDED_VAR __attribute__ ((guarded_var))
#define PT_GUARDED_BY(x) __attribute__ ((pt_guarded_by(x)))
#define PT_GUARDED_VAR __attribute__ ((pt_guarded_var))
#define ACQUIRED_AFTER(...) __attribute__ ((acquired_after(__VA_ARGS__)))
#define ACQUIRED_BEFORE(...) __attribute__ ((acquired_before(__VA_ARGS__)))
#define EXCLUSIVE_LOCK_FUNCTION(...) __attribute__ ((exclusive_lock_function(__VA_ARGS__)))
#define SHARED_LOCK_FUNCTION(...) __attribute__ ((shared_lock_function(__VA_ARGS__)))
#define EXCLUSIVE_TRYLOCK_FUNCTION(...) __attribute__ ((exclusive_trylock_function(__VA_ARGS__)))
#define SHARED_TRYLOCK_FUNCTION(...) __attribute__ ((shared_trylock_function(__VA_ARGS__)))
#define UNLOCK_FUNCTION(...) __attribute__ ((unlock_function(__VA_ARGS__)))
#define LOCK_RETURNED(x) __attribute__ ((lock_returned(x)))
#define LOCKS_EXCLUDED(...) __attribute__ ((locks_excluded(__VA_ARGS__)))
#define EXCLUSIVE_LOCKS_REQUIRED(...) __attribute__ ((exclusive_locks_required(__VA_ARGS__)))
#define SHARED_LOCKS_REQUIRED(...) __attribute__ ((shared_locks_required(__VA_ARGS__)))
#define NO_THREAD_SAFETY_ANALYSIS __attribute__ ((no_thread_safety_analysis))
#else
#define LOCKABLE
#define SCOPED_LOCKABLE
#define GUARDED_BY(x)
#define GUARDED_VAR
#define PT_GUARDED_BY(x)
#define PT_GUARDED_VAR
#define ACQUIRED_AFTER(...)
#define ACQUIRED_BEFORE(...)
#define EXCLUSIVE_LOCK_FUNCTION(...)
#define SHARED_LOCK_FUNCTION(...)
#define EXCLUSIVE_TRYLOCK_FUNCTION(...)
#define SHARED_TRYLOCK_FUNCTION(...)
#define UNLOCK_FUNCTION(...)
#define LOCK_RETURNED(x)
#define LOCKS_EXCLUDED(...)
#define EXCLUSIVE_LOCKS_REQUIRED(...)
#define SHARED_LOCKS_REQUIRED(...)
#define NO_THREAD_SAFETY_ANALYSIS
#endif // __GNUC__
#endif // BITCOIN_THREADSAFETY_H
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