1 //===----------------------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8
9 #include <__assert>
10 #include <__thread/id.h>
11 #include <__utility/exception_guard.h>
12 #include <limits>
13 #include <mutex>
14
15 #include "include/atomic_support.h"
16
17 #if defined(__ELF__) && defined(_LIBCPP_LINK_PTHREAD_LIB)
18 # pragma comment(lib, "pthread")
19 #endif
20
21 _LIBCPP_PUSH_MACROS
22 #include <__undef_macros>
23
24 _LIBCPP_BEGIN_NAMESPACE_STD
25
26 // ~mutex is defined elsewhere
27
28 void
lock()29 mutex::lock()
30 {
31 int ec = __libcpp_mutex_lock(&__m_);
32 if (ec)
33 __throw_system_error(ec, "mutex lock failed");
34 }
35
36 bool
try_lock()37 mutex::try_lock() noexcept
38 {
39 return __libcpp_mutex_trylock(&__m_);
40 }
41
42 void
unlock()43 mutex::unlock() noexcept
44 {
45 int ec = __libcpp_mutex_unlock(&__m_);
46 (void)ec;
47 _LIBCPP_ASSERT_UNCATEGORIZED(ec == 0, "call to mutex::unlock failed");
48 }
49
50 // recursive_mutex
51
recursive_mutex()52 recursive_mutex::recursive_mutex()
53 {
54 int ec = __libcpp_recursive_mutex_init(&__m_);
55 if (ec)
56 __throw_system_error(ec, "recursive_mutex constructor failed");
57 }
58
~recursive_mutex()59 recursive_mutex::~recursive_mutex()
60 {
61 int e = __libcpp_recursive_mutex_destroy(&__m_);
62 (void)e;
63 _LIBCPP_ASSERT_UNCATEGORIZED(e == 0, "call to ~recursive_mutex() failed");
64 }
65
66 void
lock()67 recursive_mutex::lock()
68 {
69 int ec = __libcpp_recursive_mutex_lock(&__m_);
70 if (ec)
71 __throw_system_error(ec, "recursive_mutex lock failed");
72 }
73
74 void
unlock()75 recursive_mutex::unlock() noexcept
76 {
77 int e = __libcpp_recursive_mutex_unlock(&__m_);
78 (void)e;
79 _LIBCPP_ASSERT_UNCATEGORIZED(e == 0, "call to recursive_mutex::unlock() failed");
80 }
81
82 bool
try_lock()83 recursive_mutex::try_lock() noexcept
84 {
85 return __libcpp_recursive_mutex_trylock(&__m_);
86 }
87
88 // timed_mutex
89
timed_mutex()90 timed_mutex::timed_mutex()
91 : __locked_(false)
92 {
93 }
94
~timed_mutex()95 timed_mutex::~timed_mutex()
96 {
97 lock_guard<mutex> _(__m_);
98 }
99
100 void
lock()101 timed_mutex::lock()
102 {
103 unique_lock<mutex> lk(__m_);
104 while (__locked_)
105 __cv_.wait(lk);
106 __locked_ = true;
107 }
108
109 bool
try_lock()110 timed_mutex::try_lock() noexcept
111 {
112 unique_lock<mutex> lk(__m_, try_to_lock);
113 if (lk.owns_lock() && !__locked_)
114 {
115 __locked_ = true;
116 return true;
117 }
118 return false;
119 }
120
121 void
unlock()122 timed_mutex::unlock() noexcept
123 {
124 lock_guard<mutex> _(__m_);
125 __locked_ = false;
126 __cv_.notify_one();
127 }
128
129 // recursive_timed_mutex
130
recursive_timed_mutex()131 recursive_timed_mutex::recursive_timed_mutex()
132 : __count_(0),
133 __id_{}
134 {
135 }
136
~recursive_timed_mutex()137 recursive_timed_mutex::~recursive_timed_mutex()
138 {
139 lock_guard<mutex> _(__m_);
140 }
141
142 void
lock()143 recursive_timed_mutex::lock()
144 {
145 __thread_id id = this_thread::get_id();
146 unique_lock<mutex> lk(__m_);
147 if (id ==__id_)
148 {
149 if (__count_ == numeric_limits<size_t>::max())
150 __throw_system_error(EAGAIN, "recursive_timed_mutex lock limit reached");
151 ++__count_;
152 return;
153 }
154 while (__count_ != 0)
155 __cv_.wait(lk);
156 __count_ = 1;
157 __id_ = id;
158 }
159
160 bool
try_lock()161 recursive_timed_mutex::try_lock() noexcept
162 {
163 __thread_id id = this_thread::get_id();
164 unique_lock<mutex> lk(__m_, try_to_lock);
165 if (lk.owns_lock() && (__count_ == 0 || id == __id_))
166 {
167 if (__count_ == numeric_limits<size_t>::max())
168 return false;
169 ++__count_;
170 __id_ = id;
171 return true;
172 }
173 return false;
174 }
175
176 void
unlock()177 recursive_timed_mutex::unlock() noexcept
178 {
179 unique_lock<mutex> lk(__m_);
180 if (--__count_ == 0)
181 {
182 __id_.__reset();
183 lk.unlock();
184 __cv_.notify_one();
185 }
186 }
187
188 _LIBCPP_END_NAMESPACE_STD
189
190 _LIBCPP_POP_MACROS
191