1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
|
// gold-threads.cc -- thread support for gold
#include "gold.h"
#ifdef ENABLE_THREADS
#include <pthread.h>
#endif
#include "gold-threads.h"
namespace gold
{
// Class Lock_impl.
class Lock_impl
{
public:
Lock_impl();
~Lock_impl();
void acquire();
void release();
private:
// This class can not be copied.
Lock_impl(const Lock_impl&);
Lock_impl& operator=(const Lock_impl&);
friend class Condvar_impl;
#ifdef ENABLE_THREADS
pthread_mutex_t mutex_;
#else
bool acquired_;
#endif
};
#ifdef ENABLE_THREADS
Lock_impl::Lock_impl()
{
pthread_mutexattr_t attr;
if (pthread_mutexattr_init(&attr) != 0)
gold_fatal(_("pthead_mutextattr_init failed"), true);
#ifdef PTHREAD_MUTEXT_ADAPTIVE_NP
if (pthread_mutextattr_settype(&attr, PTHREAD_MUTEX_ADAPTIVE_NP) != 0)
gold_fatal(_("pthread_mutextattr_settype failed"), true);
#endif
if (pthread_mutex_init (&this->mutex_, &attr) != 0)
gold_fatal(_("pthread_mutex_init failed"), true);
if (pthread_mutexattr_destroy(&attr) != 0)
gold_fatal(_("pthread_mutexattr_destroy failed"), true);
}
Lock_impl::~Lock_impl()
{
if (pthread_mutex_destroy(&this->mutex_) != 0)
gold_fatal(_("pthread_mutex_destroy failed"), true);
}
void
Lock_impl::acquire()
{
if (pthread_mutex_lock(&this->mutex_) != 0)
gold_fatal(_("pthread_mutex_lock failed"), true);
}
void
Lock_impl::release()
{
if (pthread_mutex_unlock(&this->mutex_) != 0)
gold_fatal(_("pthread_mutex_unlock failed"), true);
}
#else // !defined(ENABLE_THREADS)
Lock_impl::Lock_impl()
: acquired_(false)
{
}
Lock_impl::~Lock_impl()
{
gold_assert(!this->acquired_);
}
void
Lock_impl::acquire()
{
gold_assert(!this->acquired_);
this->acquired_ = true;
}
void
Lock_impl::release()
{
gold_assert(this->acquired_);
this->acquired_ = false;
}
#endif // !defined(ENABLE_THREADS)
// Methods for Lock class.
Lock::Lock()
{
this->lock_ = new Lock_impl;
}
Lock::~Lock()
{
delete this->lock_;
}
void
Lock::acquire()
{
this->lock_->acquire();
}
void
Lock::release()
{
this->lock_->release();
}
// Class Condvar_impl.
class Condvar_impl
{
public:
Condvar_impl();
~Condvar_impl();
void wait(Lock_impl*);
void signal();
private:
// This class can not be copied.
Condvar_impl(const Condvar_impl&);
Condvar_impl& operator=(const Condvar_impl&);
#ifdef ENABLE_THREADS
pthread_cond_t cond_;
#endif
};
#ifdef ENABLE_THREADS
Condvar_impl::Condvar_impl()
{
if (pthread_cond_init(&this->cond_, NULL) != 0)
gold_fatal(_("pthread_cond_init failed"), true);
}
Condvar_impl::~Condvar_impl()
{
if (pthread_cond_destroy(&this->cond_) != 0)
gold_fatal(_("pthread_cond_destroy failed"), true);
}
void
Condvar_impl::wait(Lock_impl* li)
{
if (pthread_cond_wait(&this->cond_, &li->mutex_) != 0)
gold_fatal(_("pthread_cond_wait failed"), true);
}
void
Condvar_impl::signal()
{
if (pthread_cond_signal(&this->cond_) != 0)
gold_fatal(_("pthread_cond_signal failed"), true);
}
#else // !defined(ENABLE_THREADS)
Condvar_impl::Condvar_impl()
{
}
Condvar_impl::~Condvar_impl()
{
}
void
Condvar_impl::wait(Lock_impl* li)
{
gold_assert(li->acquired_);
}
void
Condvar_impl::signal()
{
}
#endif // !defined(ENABLE_THREADS)
// Methods for Condvar class.
Condvar::Condvar(Lock& lock)
: lock_(lock)
{
this->condvar_ = new Condvar_impl;
}
Condvar::~Condvar()
{
delete this->condvar_;
}
void
Condvar::wait()
{
this->condvar_->wait(this->lock_.get_impl());
}
void
Condvar::signal()
{
this->condvar_->signal();
}
} // End namespace gold.
|
