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
|
/*
* Phusion Passenger - http://www.modrails.com/
* Copyright (c) 2010 Phusion
*
* "Phusion Passenger" is a trademark of Hongli Lai & Ninh Bui.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#ifndef _PASSENGER_SAFE_LIBEV_H_
#define _PASSENGER_SAFE_LIBEV_H_
#include <ev++.h>
#include <vector>
#include <boost/thread.hpp>
#include <boost/function.hpp>
#include <boost/bind.hpp>
namespace Passenger {
using namespace std;
using namespace boost;
/**
* Class for thread-safely using libev.
*/
class SafeLibev {
private:
typedef function<void ()> Callback;
struct ev_loop *loop;
pthread_t loopThread;
ev_async async;
boost::mutex syncher;
condition_variable cond;
vector<Callback> commands;
static void asyncHandler(EV_P_ ev_async *w, int revents) {
SafeLibev *self = (SafeLibev *) w->data;
unique_lock<boost::mutex> l(self->syncher);
vector<Callback> commands = self->commands;
self->commands.clear();
l.unlock();
vector<Callback>::const_iterator it, end = commands.end();
for (it = commands.begin(); it != commands.end(); it++) {
(*it)();
}
}
template<typename Watcher>
void startWatcherAndNotify(Watcher *watcher, bool *done) {
watcher->set(loop);
watcher->start();
unique_lock<boost::mutex> l(syncher);
*done = true;
cond.notify_all();
}
template<typename Watcher>
void stopWatcherAndNotify(Watcher *watcher, bool *done) {
watcher->stop();
unique_lock<boost::mutex> l(syncher);
*done = true;
cond.notify_all();
}
public:
SafeLibev(struct ev_loop *loop) {
this->loop = loop;
loopThread = pthread_self();
ev_async_init(&async, asyncHandler);
async.data = this;
ev_async_start(loop, &async);
}
~SafeLibev() {
ev_async_stop(loop, &async);
}
struct ev_loop *getLoop() const {
return loop;
}
template<typename Watcher>
void start(Watcher &watcher) {
if (pthread_equal(pthread_self(), loopThread)) {
watcher.set(loop);
watcher.start();
} else {
unique_lock<boost::mutex> l(syncher);
bool done = false;
commands.push_back(boost::bind(&SafeLibev::startWatcherAndNotify<Watcher>,
this, &watcher, &done));
ev_async_send(loop, &async);
while (!done) {
cond.wait(l);
}
}
}
template<typename Watcher>
void stop(Watcher &watcher) {
if (pthread_equal(pthread_self(), loopThread)) {
watcher.stop();
} else {
unique_lock<boost::mutex> l(syncher);
bool done = false;
commands.push_back(boost::bind(&SafeLibev::stopWatcherAndNotify<Watcher>,
this, &watcher, &done));
ev_async_send(loop, &async);
while (!done) {
cond.wait(l);
}
}
}
void run(const Callback &callback) {
if (pthread_equal(pthread_self(), loopThread)) {
callback();
} else {
unique_lock<boost::mutex> l(syncher);
commands.push_back(callback);
ev_async_send(loop, &async);
}
}
};
} // namespace Passenger
#endif /* _PASSENGER_SAFE_LIBEV_H_ */
|
