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78 lines
3.3 KiB
78 lines
3.3 KiB
// Copyright (c) 2009-2010 Satoshi Nakamoto
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// Copyright (c) 2009-2019 The Bitcoin Core developers
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// Distributed under the MIT 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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#include <mutex>
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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 https://clang.llvm.org/docs/ThreadSafetyAnalysis.html
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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 PT_GUARDED_BY(x) __attribute__((pt_guarded_by(x)))
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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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#define ASSERT_EXCLUSIVE_LOCK(...) __attribute__((assert_exclusive_lock(__VA_ARGS__)))
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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 PT_GUARDED_BY(x)
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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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#define ASSERT_EXCLUSIVE_LOCK(...)
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#endif // __GNUC__
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// StdMutex provides an annotated version of std::mutex for us,
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// and should only be used when sync.h Mutex/LOCK/etc are not usable.
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class LOCKABLE StdMutex : public std::mutex
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{
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public:
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#ifdef __clang__
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//! For negative capabilities in the Clang Thread Safety Analysis.
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//! A negative requirement uses the EXCLUSIVE_LOCKS_REQUIRED attribute, in conjunction
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//! with the ! operator, to indicate that a mutex should not be held.
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const StdMutex& operator!() const { return *this; }
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#endif // __clang__
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};
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// StdLockGuard provides an annotated version of std::lock_guard for us,
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// and should only be used when sync.h Mutex/LOCK/etc are not usable.
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class SCOPED_LOCKABLE StdLockGuard : public std::lock_guard<StdMutex>
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{
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public:
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explicit StdLockGuard(StdMutex& cs) EXCLUSIVE_LOCK_FUNCTION(cs) : std::lock_guard<StdMutex>(cs) {}
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~StdLockGuard() UNLOCK_FUNCTION() {}
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};
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#endif // BITCOIN_THREADSAFETY_H
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