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