blob: 942aa3fdcdb3b45bd857be604b300f325e38f08a (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
|
// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2019 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#ifndef BITCOIN_THREADSAFETY_H
#define BITCOIN_THREADSAFETY_H
#include <mutex>
#ifdef __clang__
// TL;DR Add GUARDED_BY(mutex) to member variables. The others are
// rarely necessary. Ex: int nFoo GUARDED_BY(cs_foo);
//
// See https://clang.llvm.org/docs/ThreadSafetyAnalysis.html
// 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))
#define ASSERT_EXCLUSIVE_LOCK(...) __attribute((assert_exclusive_lock(__VA_ARGS__)))
#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
#define ASSERT_EXCLUSIVE_LOCK(...)
#endif // __GNUC__
// StdMutex provides an annotated version of std::mutex for us,
// and should only be used when sync.h Mutex/LOCK/etc are not usable.
class LOCKABLE StdMutex : public std::mutex
{
};
// StdLockGuard provides an annotated version of std::lock_guard for us,
// and should only be used when sync.h Mutex/LOCK/etc are not usable.
class SCOPED_LOCKABLE StdLockGuard : public std::lock_guard<StdMutex>
{
public:
explicit StdLockGuard(StdMutex& cs) EXCLUSIVE_LOCK_FUNCTION(cs) : std::lock_guard<StdMutex>(cs) {}
~StdLockGuard() UNLOCK_FUNCTION() {}
};
#endif // BITCOIN_THREADSAFETY_H
|
