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
|
/*
* libjingle
* Copyright 2004--2010, Google Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "talk/base/worker.h"
#include "talk/base/common.h"
#include "talk/base/logging.h"
#include "talk/base/thread.h"
namespace talk_base {
enum {
MSG_HAVEWORK = 0,
};
Worker::Worker() : worker_thread_(NULL) {}
Worker::~Worker() {
// We need to already be stopped before being destroyed. We cannot call
// StopWork() from here because the subclass's data has already been
// destructed, so OnStop() cannot be called.
ASSERT(!worker_thread_);
}
bool Worker::StartWork() {
talk_base::Thread *me = talk_base::Thread::Current();
if (worker_thread_) {
if (worker_thread_ == me) {
// Already working on this thread, so nothing to do.
return true;
} else {
LOG(LS_ERROR) << "Automatically switching threads is not supported";
ASSERT(false);
return false;
}
}
worker_thread_ = me;
OnStart();
return true;
}
bool Worker::StopWork() {
if (!worker_thread_) {
// Already not working, so nothing to do.
return true;
} else if (worker_thread_ != talk_base::Thread::Current()) {
LOG(LS_ERROR) << "Stopping from a different thread is not supported";
ASSERT(false);
return false;
}
OnStop();
worker_thread_->Clear(this, MSG_HAVEWORK);
worker_thread_ = NULL;
return true;
}
void Worker::HaveWork() {
ASSERT(worker_thread_ != NULL);
worker_thread_->Post(this, MSG_HAVEWORK);
}
void Worker::OnMessage(talk_base::Message *msg) {
ASSERT(msg->message_id == MSG_HAVEWORK);
ASSERT(worker_thread_ == talk_base::Thread::Current());
OnHaveWork();
}
} // namespace talk_base
|
