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1 | // Support for pointer abstractions -*- C++ -*- |
2 | ||
83ffe9cd | 3 | // Copyright (C) 2011-2023 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 | { | |
7bbdd8d1 JW |
37 | // increase alignment to put each lock on a separate cache line |
38 | struct alignas(64) M : __gnu_cxx::__mutex { }; | |
39 | static M m[mask + 1]; | |
38aee22c FD |
40 | return m[i]; |
41 | } | |
42 | } | |
43 | ||
e9599233 BK |
44 | namespace std _GLIBCXX_VISIBILITY(default) |
45 | { | |
46 | _GLIBCXX_BEGIN_NAMESPACE_VERSION | |
47 | ||
8535715d | 48 | bad_weak_ptr::~bad_weak_ptr() noexcept = default; |
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49 | |
50 | char const* | |
8535715d | 51 | bad_weak_ptr::what() const noexcept |
78aff336 | 52 | { return "bad_weak_ptr"; } |
e9599233 | 53 | |
be8de894 JW |
54 | #ifdef __GTHREADS |
55 | namespace | |
56 | { | |
be8de894 | 57 | inline unsigned char key(const void* addr) |
38aee22c | 58 | { return _Hash_impl::hash(addr) & __gnu_internal::mask; } |
be8de894 JW |
59 | } |
60 | ||
b6f684ae | 61 | _Sp_locker::_Sp_locker(const void* p) noexcept |
be8de894 JW |
62 | { |
63 | if (__gthread_active_p()) | |
64 | { | |
65 | _M_key1 = _M_key2 = key(p); | |
38aee22c | 66 | __gnu_internal::get_mutex(_M_key1).lock(); |
be8de894 JW |
67 | } |
68 | else | |
38aee22c | 69 | _M_key1 = _M_key2 = __gnu_internal::invalid; |
be8de894 JW |
70 | } |
71 | ||
b6f684ae | 72 | _Sp_locker::_Sp_locker(const void* p1, const void* p2) noexcept |
be8de894 JW |
73 | { |
74 | if (__gthread_active_p()) | |
75 | { | |
76 | _M_key1 = key(p1); | |
77 | _M_key2 = key(p2); | |
78 | if (_M_key2 < _M_key1) | |
38aee22c FD |
79 | __gnu_internal::get_mutex(_M_key2).lock(); |
80 | __gnu_internal::get_mutex(_M_key1).lock(); | |
be8de894 | 81 | if (_M_key2 > _M_key1) |
38aee22c | 82 | __gnu_internal::get_mutex(_M_key2).lock(); |
be8de894 JW |
83 | } |
84 | else | |
38aee22c | 85 | _M_key1 = _M_key2 = __gnu_internal::invalid; |
be8de894 JW |
86 | } |
87 | ||
88 | _Sp_locker::~_Sp_locker() | |
89 | { | |
38aee22c | 90 | if (_M_key1 != __gnu_internal::invalid) |
be8de894 | 91 | { |
38aee22c | 92 | __gnu_internal::get_mutex(_M_key1).unlock(); |
be8de894 | 93 | if (_M_key2 != _M_key1) |
38aee22c | 94 | __gnu_internal::get_mutex(_M_key2).unlock(); |
be8de894 JW |
95 | } |
96 | } | |
97 | #endif | |
98 | ||
fb54aa59 | 99 | bool |
87eaa3c5 | 100 | _Sp_make_shared_tag::_S_eq(const type_info& ti [[gnu::unused]]) noexcept |
fb54aa59 JW |
101 | { |
102 | #if __cpp_rtti | |
103 | return ti == typeid(_Sp_make_shared_tag); | |
104 | #else | |
105 | // If libstdc++ itself is built with -fno-rtti then just assume that | |
106 | // make_shared and allocate_shared will never be used with -frtti. | |
107 | return false; | |
108 | #endif | |
109 | } | |
110 | ||
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111 | _GLIBCXX_END_NAMESPACE_VERSION |
112 | } // namespace |