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bae7f79e ILT |
1 | // gold-threads.cc -- thread support for gold |
2 | ||
6cb15b7f ILT |
3 | // Copyright 2006, 2007 Free Software Foundation, Inc. |
4 | // Written by Ian Lance Taylor <iant@google.com>. | |
5 | ||
6 | // This file is part of gold. | |
7 | ||
8 | // This program is free software; you can redistribute it and/or modify | |
9 | // it under the terms of the GNU General Public License as published by | |
10 | // the Free Software Foundation; either version 3 of the License, or | |
11 | // (at your option) any later version. | |
12 | ||
13 | // This program is distributed in the hope that it will be useful, | |
14 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | // GNU General Public License for more details. | |
17 | ||
18 | // You should have received a copy of the GNU General Public License | |
19 | // along with this program; if not, write to the Free Software | |
20 | // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
21 | // MA 02110-1301, USA. | |
22 | ||
bae7f79e ILT |
23 | #include "gold.h" |
24 | ||
fe9a4c12 ILT |
25 | #include <cerrno> |
26 | #include <cstring> | |
27 | ||
bae7f79e ILT |
28 | #ifdef ENABLE_THREADS |
29 | #include <pthread.h> | |
30 | #endif | |
31 | ||
32 | #include "gold-threads.h" | |
33 | ||
34 | namespace gold | |
35 | { | |
36 | ||
37 | // Class Lock_impl. | |
38 | ||
39 | class Lock_impl | |
40 | { | |
41 | public: | |
42 | Lock_impl(); | |
43 | ~Lock_impl(); | |
44 | ||
45 | void acquire(); | |
46 | ||
47 | void release(); | |
48 | ||
49 | private: | |
50 | // This class can not be copied. | |
51 | Lock_impl(const Lock_impl&); | |
52 | Lock_impl& operator=(const Lock_impl&); | |
53 | ||
54 | friend class Condvar_impl; | |
55 | ||
56 | #ifdef ENABLE_THREADS | |
57 | pthread_mutex_t mutex_; | |
58 | #else | |
59 | bool acquired_; | |
60 | #endif | |
61 | }; | |
62 | ||
63 | #ifdef ENABLE_THREADS | |
64 | ||
65 | Lock_impl::Lock_impl() | |
66 | { | |
67 | pthread_mutexattr_t attr; | |
68 | if (pthread_mutexattr_init(&attr) != 0) | |
fe9a4c12 | 69 | gold_fatal(_("pthead_mutextattr_init failed: %s"), strerror(errno)); |
bae7f79e ILT |
70 | #ifdef PTHREAD_MUTEXT_ADAPTIVE_NP |
71 | if (pthread_mutextattr_settype(&attr, PTHREAD_MUTEX_ADAPTIVE_NP) != 0) | |
fe9a4c12 | 72 | gold_fatal(_("pthread_mutextattr_settype failed: %s"), strerror(errno)); |
bae7f79e ILT |
73 | #endif |
74 | ||
75 | if (pthread_mutex_init (&this->mutex_, &attr) != 0) | |
fe9a4c12 | 76 | gold_fatal(_("pthread_mutex_init failed: %s"), strerror(errno)); |
bae7f79e ILT |
77 | |
78 | if (pthread_mutexattr_destroy(&attr) != 0) | |
fe9a4c12 | 79 | gold_fatal(_("pthread_mutexattr_destroy failed: %s"), strerror(errno)); |
bae7f79e ILT |
80 | } |
81 | ||
82 | Lock_impl::~Lock_impl() | |
83 | { | |
84 | if (pthread_mutex_destroy(&this->mutex_) != 0) | |
fe9a4c12 | 85 | gold_fatal(_("pthread_mutex_destroy failed: %s"), strerror(errno)); |
bae7f79e ILT |
86 | } |
87 | ||
88 | void | |
89 | Lock_impl::acquire() | |
90 | { | |
91 | if (pthread_mutex_lock(&this->mutex_) != 0) | |
fe9a4c12 | 92 | gold_fatal(_("pthread_mutex_lock failed: %s"), strerror(errno)); |
bae7f79e ILT |
93 | } |
94 | ||
95 | void | |
96 | Lock_impl::release() | |
97 | { | |
98 | if (pthread_mutex_unlock(&this->mutex_) != 0) | |
fe9a4c12 | 99 | gold_fatal(_("pthread_mutex_unlock failed: %s"), strerror(errno)); |
bae7f79e ILT |
100 | } |
101 | ||
102 | #else // !defined(ENABLE_THREADS) | |
103 | ||
104 | Lock_impl::Lock_impl() | |
105 | : acquired_(false) | |
106 | { | |
107 | } | |
108 | ||
109 | Lock_impl::~Lock_impl() | |
110 | { | |
a3ad94ed | 111 | gold_assert(!this->acquired_); |
bae7f79e ILT |
112 | } |
113 | ||
114 | void | |
115 | Lock_impl::acquire() | |
116 | { | |
a3ad94ed | 117 | gold_assert(!this->acquired_); |
bae7f79e ILT |
118 | this->acquired_ = true; |
119 | } | |
120 | ||
121 | void | |
122 | Lock_impl::release() | |
123 | { | |
a3ad94ed | 124 | gold_assert(this->acquired_); |
bae7f79e ILT |
125 | this->acquired_ = false; |
126 | } | |
127 | ||
128 | #endif // !defined(ENABLE_THREADS) | |
129 | ||
130 | // Methods for Lock class. | |
131 | ||
132 | Lock::Lock() | |
133 | { | |
134 | this->lock_ = new Lock_impl; | |
135 | } | |
136 | ||
137 | Lock::~Lock() | |
138 | { | |
139 | delete this->lock_; | |
140 | } | |
141 | ||
142 | void | |
143 | Lock::acquire() | |
144 | { | |
145 | this->lock_->acquire(); | |
146 | } | |
147 | ||
148 | void | |
149 | Lock::release() | |
150 | { | |
151 | this->lock_->release(); | |
152 | } | |
153 | ||
154 | // Class Condvar_impl. | |
155 | ||
156 | class Condvar_impl | |
157 | { | |
158 | public: | |
159 | Condvar_impl(); | |
160 | ~Condvar_impl(); | |
161 | ||
162 | void wait(Lock_impl*); | |
163 | void signal(); | |
164 | ||
165 | private: | |
166 | // This class can not be copied. | |
167 | Condvar_impl(const Condvar_impl&); | |
168 | Condvar_impl& operator=(const Condvar_impl&); | |
169 | ||
170 | #ifdef ENABLE_THREADS | |
171 | pthread_cond_t cond_; | |
172 | #endif | |
173 | }; | |
174 | ||
175 | #ifdef ENABLE_THREADS | |
176 | ||
177 | Condvar_impl::Condvar_impl() | |
178 | { | |
179 | if (pthread_cond_init(&this->cond_, NULL) != 0) | |
fe9a4c12 | 180 | gold_fatal(_("pthread_cond_init failed: %s"), strerror(errno)); |
bae7f79e ILT |
181 | } |
182 | ||
183 | Condvar_impl::~Condvar_impl() | |
184 | { | |
185 | if (pthread_cond_destroy(&this->cond_) != 0) | |
fe9a4c12 | 186 | gold_fatal(_("pthread_cond_destroy failed: %s"), strerror(errno)); |
bae7f79e ILT |
187 | } |
188 | ||
189 | void | |
190 | Condvar_impl::wait(Lock_impl* li) | |
191 | { | |
192 | if (pthread_cond_wait(&this->cond_, &li->mutex_) != 0) | |
fe9a4c12 | 193 | gold_fatal(_("pthread_cond_wait failed: %s"), strerror(errno)); |
bae7f79e ILT |
194 | } |
195 | ||
196 | void | |
197 | Condvar_impl::signal() | |
198 | { | |
199 | if (pthread_cond_signal(&this->cond_) != 0) | |
fe9a4c12 | 200 | gold_fatal(_("pthread_cond_signal failed: %s"), strerror(errno)); |
bae7f79e ILT |
201 | } |
202 | ||
203 | #else // !defined(ENABLE_THREADS) | |
204 | ||
205 | Condvar_impl::Condvar_impl() | |
206 | { | |
207 | } | |
208 | ||
209 | Condvar_impl::~Condvar_impl() | |
210 | { | |
211 | } | |
212 | ||
213 | void | |
214 | Condvar_impl::wait(Lock_impl* li) | |
215 | { | |
a3ad94ed | 216 | gold_assert(li->acquired_); |
bae7f79e ILT |
217 | } |
218 | ||
219 | void | |
220 | Condvar_impl::signal() | |
221 | { | |
222 | } | |
223 | ||
224 | #endif // !defined(ENABLE_THREADS) | |
225 | ||
226 | // Methods for Condvar class. | |
227 | ||
228 | Condvar::Condvar(Lock& lock) | |
229 | : lock_(lock) | |
230 | { | |
231 | this->condvar_ = new Condvar_impl; | |
232 | } | |
233 | ||
234 | Condvar::~Condvar() | |
235 | { | |
236 | delete this->condvar_; | |
237 | } | |
238 | ||
239 | void | |
240 | Condvar::wait() | |
241 | { | |
242 | this->condvar_->wait(this->lock_.get_impl()); | |
243 | } | |
244 | ||
245 | void | |
246 | Condvar::signal() | |
247 | { | |
248 | this->condvar_->signal(); | |
249 | } | |
250 | ||
251 | } // End namespace gold. |