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
|
// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
*
* This is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software
* Foundation. See file COPYING.
*
*/
#include "Cond.h"
#include "Timer.h"
#define dout_subsys ceph_subsys_timer
#undef dout_prefix
#define dout_prefix *_dout << "timer(" << this << ")."
using std::pair;
using ceph::operator <<;
template <class Mutex>
class CommonSafeTimerThread : public Thread {
CommonSafeTimer<Mutex> *parent;
public:
explicit CommonSafeTimerThread(CommonSafeTimer<Mutex> *s) : parent(s) {}
void *entry() override {
parent->timer_thread();
return NULL;
}
};
template <class Mutex>
CommonSafeTimer<Mutex>::CommonSafeTimer(CephContext *cct_, Mutex &l, bool safe_callbacks)
: cct(cct_), lock(l),
safe_callbacks(safe_callbacks),
thread(NULL),
stopping(false)
{
}
template <class Mutex>
CommonSafeTimer<Mutex>::~CommonSafeTimer()
{
ceph_assert(thread == NULL);
}
template <class Mutex>
void CommonSafeTimer<Mutex>::init()
{
ldout(cct,10) << "init" << dendl;
thread = new CommonSafeTimerThread<Mutex>(this);
thread->create("safe_timer");
}
template <class Mutex>
void CommonSafeTimer<Mutex>::shutdown()
{
ldout(cct,10) << "shutdown" << dendl;
if (thread) {
ceph_assert(ceph_mutex_is_locked(lock));
cancel_all_events();
stopping = true;
cond.notify_all();
lock.unlock();
thread->join();
lock.lock();
delete thread;
thread = NULL;
}
}
template <class Mutex>
void CommonSafeTimer<Mutex>::timer_thread()
{
std::unique_lock l{lock};
ldout(cct,10) << "timer_thread starting" << dendl;
while (!stopping) {
auto now = clock_t::now();
while (!schedule.empty()) {
auto p = schedule.begin();
// is the future now?
if (p->first > now)
break;
Context *callback = p->second;
events.erase(callback);
schedule.erase(p);
ldout(cct,10) << "timer_thread executing " << callback << dendl;
if (!safe_callbacks) {
l.unlock();
callback->complete(0);
l.lock();
} else {
callback->complete(0);
}
}
// recheck stopping if we dropped the lock
if (!safe_callbacks && stopping)
break;
ldout(cct,20) << "timer_thread going to sleep" << dendl;
if (schedule.empty()) {
cond.wait(l);
} else {
auto when = schedule.begin()->first;
cond.wait_until(l, when);
}
ldout(cct,20) << "timer_thread awake" << dendl;
}
ldout(cct,10) << "timer_thread exiting" << dendl;
}
template <class Mutex>
Context* CommonSafeTimer<Mutex>::add_event_after(double seconds, Context *callback)
{
return add_event_after(ceph::make_timespan(seconds), callback);
}
template <class Mutex>
Context* CommonSafeTimer<Mutex>::add_event_after(ceph::timespan duration, Context *callback)
{
ceph_assert(ceph_mutex_is_locked(lock));
auto when = clock_t::now() + duration;
return add_event_at(when, callback);
}
template <class Mutex>
Context* CommonSafeTimer<Mutex>::add_event_at(CommonSafeTimer<Mutex>::clock_t::time_point when, Context *callback)
{
ceph_assert(ceph_mutex_is_locked(lock));
ldout(cct,10) << __func__ << " " << when << " -> " << callback << dendl;
if (stopping) {
ldout(cct,5) << __func__ << " already shutdown, event not added" << dendl;
delete callback;
return nullptr;
}
scheduled_map_t::value_type s_val(when, callback);
scheduled_map_t::iterator i = schedule.insert(s_val);
event_lookup_map_t::value_type e_val(callback, i);
pair < event_lookup_map_t::iterator, bool > rval(events.insert(e_val));
/* If you hit this, you tried to insert the same Context* twice. */
ceph_assert(rval.second);
/* If the event we have just inserted comes before everything else, we need to
* adjust our timeout. */
if (i == schedule.begin())
cond.notify_all();
return callback;
}
template <class Mutex>
bool CommonSafeTimer<Mutex>::cancel_event(Context *callback)
{
ceph_assert(ceph_mutex_is_locked(lock));
auto p = events.find(callback);
if (p == events.end()) {
ldout(cct,10) << "cancel_event " << callback << " not found" << dendl;
return false;
}
ldout(cct,10) << "cancel_event " << p->second->first << " -> " << callback << dendl;
delete p->first;
schedule.erase(p->second);
events.erase(p);
return true;
}
template <class Mutex>
void CommonSafeTimer<Mutex>::cancel_all_events()
{
ldout(cct,10) << "cancel_all_events" << dendl;
ceph_assert(ceph_mutex_is_locked(lock));
while (!events.empty()) {
auto p = events.begin();
ldout(cct,10) << " cancelled " << p->second->first << " -> " << p->first << dendl;
delete p->first;
schedule.erase(p->second);
events.erase(p);
}
}
template <class Mutex>
void CommonSafeTimer<Mutex>::dump(const char *caller) const
{
if (!caller)
caller = "";
ldout(cct,10) << "dump " << caller << dendl;
for (scheduled_map_t::const_iterator s = schedule.begin();
s != schedule.end();
++s)
ldout(cct,10) << " " << s->first << "->" << s->second << dendl;
}
template class CommonSafeTimer<ceph::mutex>;
template class CommonSafeTimer<ceph::fair_mutex>;
|
