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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 | ||
25 | #ifdef ENABLE_THREADS | |
26 | #include <pthread.h> | |
27 | #endif | |
28 | ||
29 | #include "gold-threads.h" | |
30 | ||
31 | namespace gold | |
32 | { | |
33 | ||
34 | // Class Lock_impl. | |
35 | ||
36 | class Lock_impl | |
37 | { | |
38 | public: | |
39 | Lock_impl(); | |
40 | ~Lock_impl(); | |
41 | ||
42 | void acquire(); | |
43 | ||
44 | void release(); | |
45 | ||
46 | private: | |
47 | // This class can not be copied. | |
48 | Lock_impl(const Lock_impl&); | |
49 | Lock_impl& operator=(const Lock_impl&); | |
50 | ||
51 | friend class Condvar_impl; | |
52 | ||
53 | #ifdef ENABLE_THREADS | |
54 | pthread_mutex_t mutex_; | |
55 | #else | |
56 | bool acquired_; | |
57 | #endif | |
58 | }; | |
59 | ||
60 | #ifdef ENABLE_THREADS | |
61 | ||
62 | Lock_impl::Lock_impl() | |
63 | { | |
64 | pthread_mutexattr_t attr; | |
65 | if (pthread_mutexattr_init(&attr) != 0) | |
66 | gold_fatal(_("pthead_mutextattr_init failed"), true); | |
67 | #ifdef PTHREAD_MUTEXT_ADAPTIVE_NP | |
68 | if (pthread_mutextattr_settype(&attr, PTHREAD_MUTEX_ADAPTIVE_NP) != 0) | |
69 | gold_fatal(_("pthread_mutextattr_settype failed"), true); | |
70 | #endif | |
71 | ||
72 | if (pthread_mutex_init (&this->mutex_, &attr) != 0) | |
73 | gold_fatal(_("pthread_mutex_init failed"), true); | |
74 | ||
75 | if (pthread_mutexattr_destroy(&attr) != 0) | |
76 | gold_fatal(_("pthread_mutexattr_destroy failed"), true); | |
77 | } | |
78 | ||
79 | Lock_impl::~Lock_impl() | |
80 | { | |
81 | if (pthread_mutex_destroy(&this->mutex_) != 0) | |
82 | gold_fatal(_("pthread_mutex_destroy failed"), true); | |
83 | } | |
84 | ||
85 | void | |
86 | Lock_impl::acquire() | |
87 | { | |
88 | if (pthread_mutex_lock(&this->mutex_) != 0) | |
89 | gold_fatal(_("pthread_mutex_lock failed"), true); | |
90 | } | |
91 | ||
92 | void | |
93 | Lock_impl::release() | |
94 | { | |
95 | if (pthread_mutex_unlock(&this->mutex_) != 0) | |
96 | gold_fatal(_("pthread_mutex_unlock failed"), true); | |
97 | } | |
98 | ||
99 | #else // !defined(ENABLE_THREADS) | |
100 | ||
101 | Lock_impl::Lock_impl() | |
102 | : acquired_(false) | |
103 | { | |
104 | } | |
105 | ||
106 | Lock_impl::~Lock_impl() | |
107 | { | |
a3ad94ed | 108 | gold_assert(!this->acquired_); |
bae7f79e ILT |
109 | } |
110 | ||
111 | void | |
112 | Lock_impl::acquire() | |
113 | { | |
a3ad94ed | 114 | gold_assert(!this->acquired_); |
bae7f79e ILT |
115 | this->acquired_ = true; |
116 | } | |
117 | ||
118 | void | |
119 | Lock_impl::release() | |
120 | { | |
a3ad94ed | 121 | gold_assert(this->acquired_); |
bae7f79e ILT |
122 | this->acquired_ = false; |
123 | } | |
124 | ||
125 | #endif // !defined(ENABLE_THREADS) | |
126 | ||
127 | // Methods for Lock class. | |
128 | ||
129 | Lock::Lock() | |
130 | { | |
131 | this->lock_ = new Lock_impl; | |
132 | } | |
133 | ||
134 | Lock::~Lock() | |
135 | { | |
136 | delete this->lock_; | |
137 | } | |
138 | ||
139 | void | |
140 | Lock::acquire() | |
141 | { | |
142 | this->lock_->acquire(); | |
143 | } | |
144 | ||
145 | void | |
146 | Lock::release() | |
147 | { | |
148 | this->lock_->release(); | |
149 | } | |
150 | ||
151 | // Class Condvar_impl. | |
152 | ||
153 | class Condvar_impl | |
154 | { | |
155 | public: | |
156 | Condvar_impl(); | |
157 | ~Condvar_impl(); | |
158 | ||
159 | void wait(Lock_impl*); | |
160 | void signal(); | |
161 | ||
162 | private: | |
163 | // This class can not be copied. | |
164 | Condvar_impl(const Condvar_impl&); | |
165 | Condvar_impl& operator=(const Condvar_impl&); | |
166 | ||
167 | #ifdef ENABLE_THREADS | |
168 | pthread_cond_t cond_; | |
169 | #endif | |
170 | }; | |
171 | ||
172 | #ifdef ENABLE_THREADS | |
173 | ||
174 | Condvar_impl::Condvar_impl() | |
175 | { | |
176 | if (pthread_cond_init(&this->cond_, NULL) != 0) | |
177 | gold_fatal(_("pthread_cond_init failed"), true); | |
178 | } | |
179 | ||
180 | Condvar_impl::~Condvar_impl() | |
181 | { | |
182 | if (pthread_cond_destroy(&this->cond_) != 0) | |
183 | gold_fatal(_("pthread_cond_destroy failed"), true); | |
184 | } | |
185 | ||
186 | void | |
187 | Condvar_impl::wait(Lock_impl* li) | |
188 | { | |
189 | if (pthread_cond_wait(&this->cond_, &li->mutex_) != 0) | |
190 | gold_fatal(_("pthread_cond_wait failed"), true); | |
191 | } | |
192 | ||
193 | void | |
194 | Condvar_impl::signal() | |
195 | { | |
196 | if (pthread_cond_signal(&this->cond_) != 0) | |
197 | gold_fatal(_("pthread_cond_signal failed"), true); | |
198 | } | |
199 | ||
200 | #else // !defined(ENABLE_THREADS) | |
201 | ||
202 | Condvar_impl::Condvar_impl() | |
203 | { | |
204 | } | |
205 | ||
206 | Condvar_impl::~Condvar_impl() | |
207 | { | |
208 | } | |
209 | ||
210 | void | |
211 | Condvar_impl::wait(Lock_impl* li) | |
212 | { | |
a3ad94ed | 213 | gold_assert(li->acquired_); |
bae7f79e ILT |
214 | } |
215 | ||
216 | void | |
217 | Condvar_impl::signal() | |
218 | { | |
219 | } | |
220 | ||
221 | #endif // !defined(ENABLE_THREADS) | |
222 | ||
223 | // Methods for Condvar class. | |
224 | ||
225 | Condvar::Condvar(Lock& lock) | |
226 | : lock_(lock) | |
227 | { | |
228 | this->condvar_ = new Condvar_impl; | |
229 | } | |
230 | ||
231 | Condvar::~Condvar() | |
232 | { | |
233 | delete this->condvar_; | |
234 | } | |
235 | ||
236 | void | |
237 | Condvar::wait() | |
238 | { | |
239 | this->condvar_->wait(this->lock_.get_impl()); | |
240 | } | |
241 | ||
242 | void | |
243 | Condvar::signal() | |
244 | { | |
245 | this->condvar_->signal(); | |
246 | } | |
247 | ||
248 | } // End namespace gold. |