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
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
|
// $Id$
// ============================================================================
//
// = LIBRARY
// tests
//
// = FILENAME
// Semaphore Test
//
// = DESCRIPTION
// This test verifies the functionality of the <ACE_Thread_Semaphore>
// implementation.
//
// = AUTHOR
// Darrell Brunsch <brunsch@cs.wustl.edu>
//
// ============================================================================
#include "test_config.h"
#include "ace/Synch.h"
#include "ace/Thread.h"
#include "ace/Thread_Manager.h"
#include "ace/Get_Opt.h"
ACE_RCSID(tests, Semaphore_Test, "$Id$")
// msec that times are allowed to differ before test fails.
#if defined (ACE_HAS_HI_RES_TIMER) || defined (ACE_HAS_AIX_HI_RES_TIMER) || \
defined (ACE_HAS_PENTIUM) || defined (ACE_HAS_ALPHA_TIMER) || \
defined (ACE_HAS_POWERPC_TIMER)
# define ACE_ALLOWED_SLACK 100
#else /* don't have a high-res timer */
# define ACE_ALLOWED_SLACK 1100
#endif /* don't have a high-res timer */
// Test results, 'success' is 0
static int test_result = 0;
#if defined (ACE_HAS_THREADS)
// Semaphore used in the tests. Start it "locked" (i.e., its initial
// count is 0).
static ACE_Thread_Semaphore s (0);
// Default number of iterations.
static int n_iterations = 10;
// Number of worker threads.
static size_t n_workers = 10;
// Amount to release the semaphore.
static u_int n_release_count = 3;
#if !defined (ACE_HAS_STHREADS) && !defined (ACE_HAS_POSIX_SEM)
// Number of timeouts.
static size_t timeouts = 0;
// Number of times to call test_timeout ().
static size_t test_timeout_count = 3;
// Tests the amount of time spent in a timed wait.
static int
test_timeout (void)
{
int status = 0;
// milliseconds...
long msecs_expected;
long msecs_waited;
long msecs_diff;
// Wait a little longer each time
static long wait_secs = 3;
ACE_Time_Value wait = ACE_OS::gettimeofday ();
ACE_Time_Value begin = wait;
wait.sec (wait.sec () + wait_secs);
if (s.acquire (wait) == -1)
ACE_ASSERT (errno == ETIME);
ACE_Time_Value wait_diff = ACE_OS::gettimeofday () - begin;
msecs_waited = wait_diff.msec ();
msecs_expected = wait_secs * 1000;
msecs_diff = labs (msecs_expected - msecs_waited);
if (msecs_diff > ACE_ALLOWED_SLACK)
{
ACE_DEBUG ((LM_DEBUG,
ACE_TEXT ("Timed wait fails length test\n")));
ACE_DEBUG ((LM_DEBUG,
ACE_TEXT ("Value: %d ms, actual %d ms\n"),
msecs_expected,
msecs_waited));
status = -1;
}
++wait_secs;
return status;
}
#endif /* ACE_HAS_STHREADS && ACE_HAS_POSIX_SEM */
// Explain usage and exit.
static void
print_usage_and_die (void)
{
ACE_DEBUG ((LM_DEBUG,
ACE_TEXT ("usage: %n [-s n_release_count] [-w n_workers] [-n iteration_count]\n")));
ACE_OS::exit (1);
}
static void
parse_args (int argc, ACE_TCHAR *argv[])
{
ACE_Get_Opt get_opt (argc, argv, ACE_TEXT ("s:w:n:"));
int c;
while ((c = get_opt ()) != -1)
switch (c)
{
case 's':
n_release_count = ACE_OS::atoi (get_opt.opt_arg ());
break;
case 'w':
n_workers = ACE_OS::atoi (get_opt.opt_arg ());
break;
case 'n':
n_iterations = ACE_OS::atoi (get_opt.opt_arg ());
break;
default:
print_usage_and_die ();
break;
}
}
// Worker tries to acquire the semaphore, hold it for a while, and
// then releases it.
static void *
worker (void *)
{
for (int iterations = 1;
iterations <= n_iterations;
iterations++)
{
#if !defined (ACE_HAS_STHREADS) && !defined (ACE_HAS_POSIX_SEM)
ACE_Time_Value wait (0,
iterations * 1000 * 100); // Wait 'iter' msec
ACE_Time_Value tv = ACE_OS::gettimeofday () + wait;
if (s.acquire (tv))
++timeouts;
else
{
ACE_Time_Value diff = ACE_OS::gettimeofday ();
diff = diff - tv; // tv should have been reset to time acquired
if (diff.msec () > ACE_ALLOWED_SLACK)
{
ACE_DEBUG ((LM_DEBUG,
ACE_TEXT ("Acquire fails time reset test\n")));
ACE_DEBUG ((LM_DEBUG,
ACE_TEXT ("Diff btw now and returned time: %d ms\n"),
diff.msec ()));
test_result = 1;
}
// Hold the lock for a while.
ACE_OS::sleep (ACE_Time_Value (0,
(ACE_OS::rand () % 1000) * 1000));
s.release ();
}
#else
s.acquire ();
// Hold the lock for a while.
ACE_OS::sleep (ACE_Time_Value (0,
(ACE_OS::rand () % 1000) * 1000));
s.release ();
#endif /* ACE_HAS_STHREADS && ACE_HAS_POSIX_SEM */
ACE_Thread::yield ();
}
return 0;
}
#endif /* ACE_HAS_THREADS */
// Test semaphore functionality.
int run_main (int argc, ACE_TCHAR *argv[])
{
ACE_START_TEST (ACE_TEXT ("Semaphore_Test"));
#if defined (ACE_HAS_THREADS)
parse_args (argc, argv);
ACE_OS::srand (ACE_OS::time (0L));
# if !defined (ACE_HAS_STHREADS) && !defined (ACE_HAS_POSIX_SEM)
//Test timed waits.
for (size_t i = 0; i < test_timeout_count; i++)
if (test_timeout () != 0)
test_result = 1;
# endif /* ACE_HAS_STHREADS && ACE_HAS_POSIX_SEM */
// Release the semaphore a certain number of times.
s.release (n_release_count);
if (ACE_Thread_Manager::instance ()->spawn_n
(ACE_static_cast (size_t, n_workers),
ACE_THR_FUNC (worker),
0,
THR_NEW_LWP) == -1)
ACE_ERROR_RETURN ((LM_ERROR,
ACE_TEXT ("%p\n"),
ACE_TEXT ("spawn_n")),
1);
ACE_Thread_Manager::instance ()->wait ();
# if !defined (ACE_HAS_STHREADS) && !defined (ACE_HAS_POSIX_SEM)
size_t percent = (timeouts * 100) / (n_workers * n_iterations);
ACE_DEBUG ((LM_DEBUG,
ACE_TEXT ("Worker threads timed out %d percent of the time\n"),
percent));
# endif /* ACE_HAS_STHREADS && ACE_HAS_POSIX_SEM */
ACE_DEBUG ((LM_DEBUG, ACE_TEXT ("Semaphore Test successful\n")));
#else
ACE_UNUSED_ARG (argc);
ACE_UNUSED_ARG (argv);
ACE_ERROR ((LM_INFO,
ACE_TEXT ("Threads not supported on this platform\n")));
#endif /* ACE_HAS_THREADS */
ACE_END_TEST;
return test_result;
}
|
