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
|
// --------------------------------------------------------------------------
//
// File
// Name: WaitForEvent.cpp
// Purpose: Generic waiting for events, using an efficient method (platform dependent)
// Created: 9/3/04
//
// --------------------------------------------------------------------------
#include "Box.h"
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include "WaitForEvent.h"
#include "MemLeakFindOn.h"
// --------------------------------------------------------------------------
//
// Function
// Name: WaitForEvent::WaitForEvent()
// Purpose: Constructor
// Created: 9/3/04
//
// --------------------------------------------------------------------------
#ifdef HAVE_KQUEUE
WaitForEvent::WaitForEvent(int Timeout)
: mKQueue(::kqueue()),
mpTimeout(0)
{
if(mKQueue == -1)
{
THROW_EXCEPTION(CommonException, CouldNotCreateKQueue)
}
// Set the choosen timeout
SetTimeout(Timeout);
}
#else
WaitForEvent::WaitForEvent(int Timeout)
: mTimeout(Timeout),
mpPollInfo(0)
{
}
#endif
// --------------------------------------------------------------------------
//
// Function
// Name: WaitForEvent::~WaitForEvent()
// Purpose: Destructor
// Created: 9/3/04
//
// --------------------------------------------------------------------------
WaitForEvent::~WaitForEvent()
{
#ifdef HAVE_KQUEUE
::close(mKQueue);
mKQueue = -1;
#else
if(mpPollInfo != 0)
{
::free(mpPollInfo);
mpPollInfo = 0;
}
#endif
}
// --------------------------------------------------------------------------
//
// Function
// Name: WaitForEvent::SetTimeout
// Purpose: Sets the timeout for future wait calls
// Created: 9/3/04
//
// --------------------------------------------------------------------------
void WaitForEvent::SetTimeout(int Timeout)
{
#ifdef HAVE_KQUEUE
// Generate timeout
if(Timeout != TimeoutInfinite)
{
mTimeout.tv_sec = Timeout / 1000;
mTimeout.tv_nsec = (Timeout % 1000) * 1000000;
}
// Infinite or not?
mpTimeout = (Timeout != TimeoutInfinite)?(&mTimeout):(NULL);
#else
mTimeout = Timeout;
#endif
}
// --------------------------------------------------------------------------
//
// Function
// Name: WaitForEvent::Wait(int)
// Purpose: Wait for an event to take place. Returns a pointer to the object
// which has been signalled, or returns 0 for the timeout condition.
// Timeout specified in milliseconds.
// Created: 9/3/04
//
// --------------------------------------------------------------------------
void *WaitForEvent::Wait()
{
#ifdef HAVE_KQUEUE
// Event return structure
struct kevent e;
::memset(&e, 0, sizeof(e));
switch(::kevent(mKQueue, NULL, 0, &e, 1, mpTimeout))
{
case 0:
// Timeout
return 0;
break;
case 1:
// Event happened!
return e.udata;
break;
default:
// Interrupted system calls aren't an error, just equivalent to a timeout
if(errno != EINTR)
{
THROW_EXCEPTION(CommonException, KEventErrorWait)
}
return 0;
break;
}
#else
// Use poll() instead.
// Need to build the structures?
if(mpPollInfo == 0)
{
// Yes...
mpPollInfo = (struct pollfd *)::malloc((sizeof(struct pollfd) * mItems.size()) + 4);
if(mpPollInfo == 0)
{
throw std::bad_alloc();
}
// Build...
for(unsigned int l = 0; l < mItems.size(); ++l)
{
mpPollInfo[l].fd = mItems[l].fd;
mpPollInfo[l].events = mItems[l].events;
mpPollInfo[l].revents = 0;
}
}
// Make sure everything is reset (don't really have to do this, but don't trust the OS)
for(unsigned int l = 0; l < mItems.size(); ++l)
{
mpPollInfo[l].revents = 0;
}
// Poll!
switch(::poll(mpPollInfo, mItems.size(), mTimeout))
{
case -1:
// Interrupted system calls aren't an error, just equivalent to a timeout
if(errno != EINTR)
{
THROW_EXCEPTION(CommonException, KEventErrorWait)
}
return 0;
break;
case 0: // timed out
return 0;
break;
default: // got some thing...
// control flows on...
break;
}
// Find the item which was ready
for(unsigned int s = 0; s < mItems.size(); ++s)
{
if(mpPollInfo[s].revents & POLLIN)
{
return mItems[s].item;
break;
}
}
#endif
return 0;
}
|
