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1 | // Support for pointer abstractions -*- C++ -*- |
2 | ||
818ab71a | 3 | // Copyright (C) 2011-2016 Free Software Foundation, Inc. |
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4 | // |
5 | // This file is part of the GNU ISO C++ Library. This library is free | |
6 | // software; you can redistribute it and/or modify it under the | |
7 | // terms of the GNU General Public License as published by the | |
8 | // Free Software Foundation; either version 3, or (at your option) | |
9 | // any later version. | |
10 | ||
11 | // This library is distributed in the hope that it will be useful, | |
12 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | // GNU General Public License for more details. | |
15 | ||
16 | // Under Section 7 of GPL version 3, you are granted additional | |
17 | // permissions described in the GCC Runtime Library Exception, version | |
18 | // 3.1, as published by the Free Software Foundation. | |
19 | ||
20 | // You should have received a copy of the GNU General Public License and | |
21 | // a copy of the GCC Runtime Library Exception along with this program; | |
22 | // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
23 | // <http://www.gnu.org/licenses/>. | |
24 | ||
25 | #include <memory> | |
26 | ||
38aee22c FD |
27 | #include "mutex_pool.h" |
28 | ||
29 | namespace __gnu_internal _GLIBCXX_VISIBILITY(hidden) | |
30 | { | |
31 | /* Returns different instances of __mutex depending on the passed index | |
32 | * in order to limit contention. | |
33 | */ | |
34 | __gnu_cxx::__mutex& | |
35 | get_mutex(unsigned char i) | |
36 | { | |
37 | static __gnu_cxx::__mutex m[mask + 1]; | |
38 | return m[i]; | |
39 | } | |
40 | } | |
41 | ||
e9599233 BK |
42 | namespace std _GLIBCXX_VISIBILITY(default) |
43 | { | |
44 | _GLIBCXX_BEGIN_NAMESPACE_VERSION | |
45 | ||
8535715d | 46 | bad_weak_ptr::~bad_weak_ptr() noexcept = default; |
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47 | |
48 | char const* | |
8535715d | 49 | bad_weak_ptr::what() const noexcept |
78aff336 | 50 | { return "bad_weak_ptr"; } |
e9599233 | 51 | |
be8de894 JW |
52 | #ifdef __GTHREADS |
53 | namespace | |
54 | { | |
be8de894 | 55 | inline unsigned char key(const void* addr) |
38aee22c | 56 | { return _Hash_impl::hash(addr) & __gnu_internal::mask; } |
be8de894 JW |
57 | } |
58 | ||
59 | _Sp_locker::_Sp_locker(const void* p) | |
60 | { | |
61 | if (__gthread_active_p()) | |
62 | { | |
63 | _M_key1 = _M_key2 = key(p); | |
38aee22c | 64 | __gnu_internal::get_mutex(_M_key1).lock(); |
be8de894 JW |
65 | } |
66 | else | |
38aee22c | 67 | _M_key1 = _M_key2 = __gnu_internal::invalid; |
be8de894 JW |
68 | } |
69 | ||
70 | _Sp_locker::_Sp_locker(const void* p1, const void* p2) | |
71 | { | |
72 | if (__gthread_active_p()) | |
73 | { | |
74 | _M_key1 = key(p1); | |
75 | _M_key2 = key(p2); | |
76 | if (_M_key2 < _M_key1) | |
38aee22c FD |
77 | __gnu_internal::get_mutex(_M_key2).lock(); |
78 | __gnu_internal::get_mutex(_M_key1).lock(); | |
be8de894 | 79 | if (_M_key2 > _M_key1) |
38aee22c | 80 | __gnu_internal::get_mutex(_M_key2).lock(); |
be8de894 JW |
81 | } |
82 | else | |
38aee22c | 83 | _M_key1 = _M_key2 = __gnu_internal::invalid; |
be8de894 JW |
84 | } |
85 | ||
86 | _Sp_locker::~_Sp_locker() | |
87 | { | |
38aee22c | 88 | if (_M_key1 != __gnu_internal::invalid) |
be8de894 | 89 | { |
38aee22c | 90 | __gnu_internal::get_mutex(_M_key1).unlock(); |
be8de894 | 91 | if (_M_key2 != _M_key1) |
38aee22c | 92 | __gnu_internal::get_mutex(_M_key2).unlock(); |
be8de894 JW |
93 | } |
94 | } | |
95 | #endif | |
96 | ||
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97 | _GLIBCXX_END_NAMESPACE_VERSION |
98 | } // namespace |