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
229
230
231
|
/*
* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "webrtc/system_wrappers/source/event_timer_posix.h"
#include <errno.h>
#include <pthread.h>
#include <signal.h>
#include <stdio.h>
#include <string.h>
#include <sys/time.h>
#include <unistd.h>
#include "webrtc/base/checks.h"
namespace webrtc {
// static
EventTimerWrapper* EventTimerWrapper::Create() {
return new EventTimerPosix();
}
const long int E6 = 1000000;
const long int E9 = 1000 * E6;
EventTimerPosix::EventTimerPosix()
: event_set_(false),
timer_thread_(nullptr),
created_at_(),
periodic_(false),
time_(0),
count_(0) {
pthread_mutexattr_t attr;
pthread_mutexattr_init(&attr);
pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
pthread_mutex_init(&mutex_, &attr);
#ifdef WEBRTC_CLOCK_TYPE_REALTIME
pthread_cond_init(&cond_, 0);
#else
pthread_condattr_t cond_attr;
pthread_condattr_init(&cond_attr);
pthread_condattr_setclock(&cond_attr, CLOCK_MONOTONIC);
pthread_cond_init(&cond_, &cond_attr);
pthread_condattr_destroy(&cond_attr);
#endif
}
EventTimerPosix::~EventTimerPosix() {
StopTimer();
pthread_cond_destroy(&cond_);
pthread_mutex_destroy(&mutex_);
}
// TODO(pbos): Make this void.
bool EventTimerPosix::Set() {
RTC_CHECK_EQ(0, pthread_mutex_lock(&mutex_));
event_set_ = true;
pthread_cond_signal(&cond_);
pthread_mutex_unlock(&mutex_);
return true;
}
EventTypeWrapper EventTimerPosix::Wait(unsigned long timeout) {
int ret_val = 0;
RTC_CHECK_EQ(0, pthread_mutex_lock(&mutex_));
if (!event_set_) {
if (WEBRTC_EVENT_INFINITE != timeout) {
timespec end_at;
#ifndef WEBRTC_MAC
#ifdef WEBRTC_CLOCK_TYPE_REALTIME
clock_gettime(CLOCK_REALTIME, &end_at);
#else
clock_gettime(CLOCK_MONOTONIC, &end_at);
#endif
#else
timeval value;
struct timezone time_zone;
time_zone.tz_minuteswest = 0;
time_zone.tz_dsttime = 0;
gettimeofday(&value, &time_zone);
TIMEVAL_TO_TIMESPEC(&value, &end_at);
#endif
end_at.tv_sec += timeout / 1000;
end_at.tv_nsec += (timeout - (timeout / 1000) * 1000) * E6;
if (end_at.tv_nsec >= E9) {
end_at.tv_sec++;
end_at.tv_nsec -= E9;
}
while (ret_val == 0 && !event_set_)
ret_val = pthread_cond_timedwait(&cond_, &mutex_, &end_at);
} else {
while (ret_val == 0 && !event_set_)
ret_val = pthread_cond_wait(&cond_, &mutex_);
}
}
RTC_DCHECK(ret_val == 0 || ret_val == ETIMEDOUT);
// Reset and signal if set, regardless of why the thread woke up.
if (event_set_) {
ret_val = 0;
event_set_ = false;
}
pthread_mutex_unlock(&mutex_);
return ret_val == 0 ? kEventSignaled : kEventTimeout;
}
EventTypeWrapper EventTimerPosix::Wait(timespec* end_at) {
int ret_val = 0;
RTC_CHECK_EQ(0, pthread_mutex_lock(&mutex_));
while (ret_val == 0 && !event_set_)
ret_val = pthread_cond_timedwait(&cond_, &mutex_, end_at);
RTC_DCHECK(ret_val == 0 || ret_val == ETIMEDOUT);
// Reset and signal if set, regardless of why the thread woke up.
if (event_set_) {
ret_val = 0;
event_set_ = false;
}
pthread_mutex_unlock(&mutex_);
return ret_val == 0 ? kEventSignaled : kEventTimeout;
}
bool EventTimerPosix::StartTimer(bool periodic, unsigned long time) {
pthread_mutex_lock(&mutex_);
if (timer_thread_) {
if (periodic_) {
// Timer already started.
pthread_mutex_unlock(&mutex_);
return false;
} else {
// New one shot timer
time_ = time;
created_at_.tv_sec = 0;
timer_event_->Set();
pthread_mutex_unlock(&mutex_);
return true;
}
}
// Start the timer thread
timer_event_.reset(new EventTimerPosix());
const char* thread_name = "WebRtc_event_timer_thread";
timer_thread_ = ThreadWrapper::CreateThread(Run, this, thread_name);
periodic_ = periodic;
time_ = time;
bool started = timer_thread_->Start();
timer_thread_->SetPriority(kRealtimePriority);
pthread_mutex_unlock(&mutex_);
return started;
}
bool EventTimerPosix::Run(void* obj) {
return static_cast<EventTimerPosix*>(obj)->Process();
}
bool EventTimerPosix::Process() {
pthread_mutex_lock(&mutex_);
if (created_at_.tv_sec == 0) {
#ifndef WEBRTC_MAC
#ifdef WEBRTC_CLOCK_TYPE_REALTIME
clock_gettime(CLOCK_REALTIME, &created_at_);
#else
clock_gettime(CLOCK_MONOTONIC, &created_at_);
#endif
#else
timeval value;
struct timezone time_zone;
time_zone.tz_minuteswest = 0;
time_zone.tz_dsttime = 0;
gettimeofday(&value, &time_zone);
TIMEVAL_TO_TIMESPEC(&value, &created_at_);
#endif
count_ = 0;
}
timespec end_at;
unsigned long long time = time_ * ++count_;
end_at.tv_sec = created_at_.tv_sec + time / 1000;
end_at.tv_nsec = created_at_.tv_nsec + (time - (time / 1000) * 1000) * E6;
if (end_at.tv_nsec >= E9) {
end_at.tv_sec++;
end_at.tv_nsec -= E9;
}
pthread_mutex_unlock(&mutex_);
if (timer_event_->Wait(&end_at) == kEventSignaled)
return true;
pthread_mutex_lock(&mutex_);
if (periodic_ || count_ == 1)
Set();
pthread_mutex_unlock(&mutex_);
return true;
}
bool EventTimerPosix::StopTimer() {
if (timer_event_) {
timer_event_->Set();
}
if (timer_thread_) {
if (!timer_thread_->Stop()) {
return false;
}
timer_thread_.reset();
}
timer_event_.reset();
// Set time to zero to force new reference time for the timer.
memset(&created_at_, 0, sizeof(created_at_));
count_ = 0;
return true;
}
} // namespace webrtc
|
