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
|
// $Id$
#include "task.h"
#include "block.h"
#include "data.h"
Task::Task (size_t n_threads)
: barrier_ (n_threads),
n_threads_ (n_threads)
{
ACE_DEBUG ((LM_DEBUG,
"(%P|%t) Task ctor 0x%x\n",
(void *) this));
}
Task::~Task (void)
{
ACE_DEBUG ((LM_DEBUG,
"(%P|%t) Task dtor 0x%x\n",
(void *) this));
ACE_Message_Block *message;
this->getq (message);
message->release ();
}
int
Task::open (void *)
{
return this->activate (THR_NEW_LWP,
this->n_threads_);
}
int
Task::close (u_long flags)
{
ACE_DEBUG ((LM_DEBUG,
"(%P|%t) Task close 0x%x\n",
(void *) this));
return inherited::close (flags);
}
int
Task::svc (void)
{
this->barrier_.wait ();
ACE_DEBUG ((LM_DEBUG,
"(%P|%t) Task 0x%x starts in thread %d\n",
(void *) this,
ACE_Thread::self ()));
ACE_Message_Block *message;
for (;;)
{
if (this->getq (message) == -1)
ACE_ERROR_RETURN ((LM_ERROR,
"%p\n",
"getq"),
-1);
if (message->msg_type () == ACE_Message_Block::MB_HANGUP)
{
this->putq (message);
break;
}
const char *cp = message->rd_ptr ();
// Don't forget to skip the NULL we inserted
message->rd_ptr (ACE_OS::strlen (cp) + 1);
ACE_DEBUG ((LM_DEBUG,
"(%P|%t) Block 0x%x contains (%s)\n",
(void *) message,
cp));
/* Create a Data object into which we can extract the message
block contents. */
Data data;
/* Use the rd_ptr() to access the message block data. Note that
we've already moved it past the text string in the block. */
ACE_OS::memmove ((char *) &data,
message->rd_ptr (),
sizeof (data));
message->rd_ptr (sizeof (data)); // Move the rd_ptr() beyond the data.
/* Invoke a couple of method calls on the object we constructed. */
data.who_am_i ();
data.what_am_i ();
/* An alternate approach:
Data * data;
data = (Data *)message->rd_ptr();
data->who_am_i();
data->what_am_i();
message->rd_ptr(sizeof(Data));
Even though this cuts down on the number of copies &
constructions, I'm not real fond of it. You can get into
trouble in a hurry by treating memory blocks as multiple data
types... */
ACE_OS::sleep (ACE_Time_Value (0, 5000));
message->release ();
}
return 0;
}
|
