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
|
// $Id$
// ============================================================================
//
// = LIBRARY
// tests
//
// = FILENAME
// Semaphore Test
//
// = DESCRIPTION
// This test verifies the functionality of the ACE_Thread_Semaphore
// implementation.
//
// = AUTHOR
// Darrell Brunsch
//
// ============================================================================
#include "ace/Synch.h"
#include "ace/Thread.h"
#include "ace/Service_Config.h"
#include "ace/Get_Opt.h"
#include "test_config.h"
#if defined (ACE_HAS_THREADS)
// Semaphore used in the tests.
static ACE_Thread_Semaphore s(0);
// Default number of iterations.
static size_t n_iterations = 10;
static size_t n_workers = 10;
static size_t n_semcount = 3;
static size_t timeouts = 0;
// Explain usage and exit.
static void
print_usage_and_die (void)
{
ACE_DEBUG ((LM_DEBUG,
"usage: %n [-s n_semcount] [-w n_workers] [-n iteration_count]\n"));
ACE_OS::exit (1);
}
static void
parse_args (int argc, char *argv[])
{
ACE_Get_Opt get_opt (argc, argv, "s:w:n:");
int c;
while ((c = get_opt ()) != -1)
switch (c)
{
case 's':
n_semcount = ACE_OS::atoi (get_opt.optarg);
break;
case 'w':
n_workers = ACE_OS::atoi (get_opt.optarg);
break;
case 'n':
n_iterations = ACE_OS::atoi (get_opt.optarg);
break;
default:
print_usage_and_die ();
break;
}
}
// Tests the amount of time spent in a timed wait.
static int
test_timeout (void)
{
ACE_Time_Value begin, wait, diff;
// Pick some random number of milliseconds to
wait = ACE_Time_Value (0, (ACE_OS::rand () % 10) * 100000);
begin = ACE_OS::gettimeofday ();
s.acquire(wait);
diff = ACE_OS::gettimeofday () - begin;
if (diff < wait)
{
ACE_DEBUG ((LM_DEBUG, "Timed wait fails length test\n"));
ACE_DEBUG ((LM_DEBUG, "Value: %d us Actual %d us\n", wait.usec (), diff.usec ()));
return -1;
}
return 0;
}
// Worker tries to acquire the semaphore, hold it for a while, and then releases it.
static void *
worker (void *)
{
ACE_Thread_Control tc (ACE_Thread_Manager::instance ());
ACE_NEW_THREAD;
for (size_t iterations = 1; iterations <= n_iterations; iterations++)
{
if (s.acquire (ACE_Time_Value (0, (ACE_OS::rand () % 1000) * 1000)))
++timeouts;
else
{
// Hold the lock for a while.
ACE_OS::sleep (ACE_Time_Value (0, (ACE_OS::rand () % 1000) * 1000));
s.release ();
}
ACE_Thread::yield ();
}
return 0;
}
#endif /* ACE_HAS_THREADS */
// Test semaphore functionality
int main (int argc, char *argv[])
{
ACE_START_TEST ("Semaphore_Test");
#if defined (ACE_HAS_THREADS)
parse_args (argc, argv);
ACE_OS::srand (ACE_OS::time (0L));
#if !defined (ACE_HAS_STHREADS)
size_t i; // Loop variable
// Test out timed waits
for (i = 0; i < 5; i++)
test_timeout ();
// Initialize the semaphore to a certain number
for (i = 0; i < n_semcount; i++)
s.release ();
if (ACE_Thread_Manager::instance ()->spawn_n (n_workers,
ACE_THR_FUNC (worker),
0,
THR_NEW_LWP) == -1)
ACE_ERROR_RETURN ((LM_ERROR, "%p\n", "spawn_n"), 1);
ACE_Thread_Manager::instance ()->wait ();
size_t percent = (timeouts * 100) / (n_workers * n_iterations);
ACE_DEBUG ((LM_DEBUG, "Worker Threads timed out %d percent of the time\n", percent));
#endif /* ACE_HAS_STHREADS */
#else
ACE_UNUSED_ARG (argc);
ACE_UNUSED_ARG (argv);
ACE_ERROR ((LM_ERROR, "Threads not supported on this platform\n"));
#endif /* ACE_HAS_THREADS */
ACE_END_TEST;
return 0;
}
|
