blob: 5fd389e02fb0d888ec5678d4666a0af73f1e2887 (
plain)
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
|
/*
* Copyright (C) 2012 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* Synchronize two or more threads using a condition variable and a mutex.
*/
#pragma once
#include "CondVar.h"
#include "Mutex.h"
class SyncEvent
{
public:
/*******************************************************************************
**
** Function: ~SyncEvent
**
** Description: Cleanup all resources.
**
** Returns: None.
**
*******************************************************************************/
~SyncEvent ()
{
}
/*******************************************************************************
**
** Function: start
**
** Description: Start a synchronization operation.
**
** Returns: None.
**
*******************************************************************************/
void start ()
{
mMutex.lock ();
}
/*******************************************************************************
**
** Function: wait
**
** Description: Block the thread and wait for the event to occur.
**
** Returns: None.
**
*******************************************************************************/
void wait ()
{
mCondVar.wait (mMutex);
}
/*******************************************************************************
**
** Function: wait
**
** Description: Block the thread and wait for the event to occur.
** millisec: Timeout in milliseconds.
**
** Returns: True if wait is successful; false if timeout occurs.
**
*******************************************************************************/
bool wait (long millisec)
{
bool retVal = mCondVar.wait (mMutex, millisec);
return retVal;
}
/*******************************************************************************
**
** Function: notifyOne
**
** Description: Notify a blocked thread that the event has occured. Unblocks it.
**
** Returns: None.
**
*******************************************************************************/
void notifyOne ()
{
mCondVar.notifyOne ();
}
/*******************************************************************************
**
** Function: end
**
** Description: End a synchronization operation.
**
** Returns: None.
**
*******************************************************************************/
void end ()
{
mMutex.unlock ();
}
private:
CondVar mCondVar;
Mutex mMutex;
};
/*****************************************************************************/
/*****************************************************************************/
/*****************************************************************************
**
** Name: SyncEventGuard
**
** Description: Automatically start and end a synchronization event.
**
*****************************************************************************/
class SyncEventGuard
{
public:
/*******************************************************************************
**
** Function: SyncEventGuard
**
** Description: Start a synchronization operation.
**
** Returns: None.
**
*******************************************************************************/
SyncEventGuard (SyncEvent& event)
: mEvent (event)
{
event.start (); //automatically start operation
};
/*******************************************************************************
**
** Function: ~SyncEventGuard
**
** Description: End a synchronization operation.
**
** Returns: None.
**
*******************************************************************************/
~SyncEventGuard ()
{
mEvent.end (); //automatically end operation
};
private:
SyncEvent& mEvent;
};
|
