blob: 6703f9d5516798e70a1e1e16061404d525d4284f (
plain) (
blame)
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
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
|
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//
// Abstract interface to shared reader/writer log, hiding platform and
// configuration differences.
//
//===----------------------------------------------------------------------===//
#ifndef __RWMUTEX_HPP__
#define __RWMUTEX_HPP__
#if defined(_WIN32)
#include <windows.h>
#elif !defined(_LIBUNWIND_HAS_NO_THREADS)
#include <pthread.h>
#if defined(__ELF__) && defined(_LIBUNWIND_LINK_PTHREAD_LIB)
#pragma comment(lib, "pthread")
#endif
#endif
namespace libunwind {
#if defined(_LIBUNWIND_HAS_NO_THREADS)
class _LIBUNWIND_HIDDEN RWMutex {
public:
bool lock_shared() { return true; }
bool unlock_shared() { return true; }
bool lock() { return true; }
bool unlock() { return true; }
};
#elif defined(_WIN32)
class _LIBUNWIND_HIDDEN RWMutex {
public:
bool lock_shared() {
AcquireSRWLockShared(&_lock);
return true;
}
bool unlock_shared() {
ReleaseSRWLockShared(&_lock);
return true;
}
bool lock() {
AcquireSRWLockExclusive(&_lock);
return true;
}
bool unlock() {
ReleaseSRWLockExclusive(&_lock);
return true;
}
private:
SRWLOCK _lock = SRWLOCK_INIT;
};
#elif !defined(LIBUNWIND_USE_WEAK_PTHREAD)
class _LIBUNWIND_HIDDEN RWMutex {
public:
bool lock_shared() { return pthread_rwlock_rdlock(&_lock) == 0; }
bool unlock_shared() { return pthread_rwlock_unlock(&_lock) == 0; }
bool lock() { return pthread_rwlock_wrlock(&_lock) == 0; }
bool unlock() { return pthread_rwlock_unlock(&_lock) == 0; }
private:
pthread_rwlock_t _lock = PTHREAD_RWLOCK_INITIALIZER;
};
#else
extern "C" int __attribute__((weak))
pthread_create(pthread_t *thread, const pthread_attr_t *attr,
void *(*start_routine)(void *), void *arg);
extern "C" int __attribute__((weak))
pthread_rwlock_rdlock(pthread_rwlock_t *lock);
extern "C" int __attribute__((weak))
pthread_rwlock_wrlock(pthread_rwlock_t *lock);
extern "C" int __attribute__((weak))
pthread_rwlock_unlock(pthread_rwlock_t *lock);
// Calls to the locking functions are gated on pthread_create, and not the
// functions themselves, because the data structure should only be locked if
// another thread has been created. This is what similar libraries do.
class _LIBUNWIND_HIDDEN RWMutex {
public:
bool lock_shared() {
return !pthread_create || (pthread_rwlock_rdlock(&_lock) == 0);
}
bool unlock_shared() {
return !pthread_create || (pthread_rwlock_unlock(&_lock) == 0);
}
bool lock() {
return !pthread_create || (pthread_rwlock_wrlock(&_lock) == 0);
}
bool unlock() {
return !pthread_create || (pthread_rwlock_unlock(&_lock) == 0);
}
private:
pthread_rwlock_t _lock = PTHREAD_RWLOCK_INITIALIZER;
};
#endif
} // namespace libunwind
#endif // __RWMUTEX_HPP__
|
