summaryrefslogtreecommitdiff
path: root/tests/Upgradable_RW_Test.cpp
blob: 76773302fa0b98b7bd759fc19001d1b884fe6232 (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
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
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
// $Id$

// ============================================================================
//
// = LIBRARY
//    tests
//
// = FILENAME
//    Upgradable_RW_Test.cpp
//
// = DESCRIPTION
//      This test program verifies the functionality of the ACE_OS
//      implementation of readers/writer locks on Win32 and Posix
//      pthreads.  Use the RW_Mutex define switch to use
//      readers/writer mutexes or regular mutexes.
//
// = AUTHOR
//    Michael Kircher <mk1@cs.wustl.edu>
//
// ============================================================================

#include "Upgradable_RW_Test.h"
#include "ace/Atomic_Op.h"

ACE_RCSID(tests, Upgradable_RW_Test, "$Id$")

#if defined (ACE_HAS_THREADS)

// Default number of iterations.
static size_t n_iterations = 50;

// Maximum string length used
static const size_t MAX_STRING_SIZE = 200;

// switch on RW mutexes, else use ordinary mutexes
// #define RW_MUTEX 1

// Default number of readers.
static size_t n_readers = 10;

// Default number of writers.
static size_t n_writers = 0;

// Number of entries in the hash map
static u_int n_entries = 10;

// Try to upgrade to a write lock, by default don't try.
static u_int use_try_upgrade = 0;

// number of readers, which were able to upgrade
static u_int upgraded = 0;

// count the number of find calls
static u_int find_called = 0;

// number of readers, failing or not allowed to upgrade
static u_int not_upgraded = 0;

// Thread creation flags.
static long thr_flags = THR_NEW_LWP;

// Lock for shared_data (upgraded, not_upgraded, hash_Map)
#if defined (RW_MUTEX)
static ACE_RW_Thread_Mutex rw_mutex;
#else
static ACE_Thread_Mutex mutex;
#endif /* RW_MUTEX */

// Count of the number of readers and writers.
static ACE_Atomic_Op<ACE_Thread_Mutex, int> current_readers;
static ACE_Atomic_Op<ACE_Thread_Mutex, int> current_writers;

static Linked_List *linked_list_ptr;

// Returns 1 if found,
//         0 if not found,
//        -1 on an error
static int
find_last (void)
{
  find_called++;

  char search_string[MAX_STRING_SIZE];
  ACE_OS::sprintf (search_string,
                   "%d",
                   n_entries - 1);
  ACE_CString cString (search_string);
  Element *element_ptr = 0;

  for (ACE_Double_Linked_List_Iterator<Element> iterator (*linked_list_ptr);
       !iterator.done ();
       iterator.advance ())
    {
      element_ptr = iterator.next ();
      if (element_ptr)
        if (*element_ptr->value () == cString)
          return 1;
    }

  return 0;

}

// Explain usage and exit.
static void
print_usage_and_die (void)
{
  ACE_DEBUG ((LM_DEBUG,
              ACE_TEXT ("usage: %n [-r n_readers] [-w n_writers]\n")
              ACE_TEXT ("   [-e max_entries] [-u try update] ")
              ACE_TEXT ("[-n iteration_count] [-f for FIFO threads]\n")));
  ACE_OS::exit (1);
}

static void
parse_args (int argc, ACE_TCHAR *argv[])
{
  ACE_Get_Opt get_opt (argc, argv, ACE_TEXT ("e:fr:w:n:u"));

  int c;

  while ((c = get_opt ()) != -1)
    switch (c)
      {
      case 'e':
        n_entries = ACE_OS::atoi (get_opt.opt_arg ());
        break;
      case 'f':
        thr_flags = THR_BOUND | THR_SCHED_FIFO;
        break;
      case 'r':
        n_readers = ACE_OS::atoi (get_opt.opt_arg ());
        break;
      case 'w':
        n_writers = ACE_OS::atoi (get_opt.opt_arg ());
        break;
      case 'n':
        n_iterations = ACE_OS::atoi (get_opt.opt_arg ());
        break;
      case 'u':
        use_try_upgrade = 1;
        break;
      default:
        print_usage_and_die ();
        break;
      }
}

// Iterate <n_iterations> each time checking that nobody modifies the data
// while we have a read lock.

int
Reader_Task::svc (void)
{
  ACE_Profile_Timer timer;
  ACE_Profile_Timer::ACE_Elapsed_Time elapsed_time;

  barrier_.wait ();
  // Wait at the barrier.

  // We start an ACE_Profile_Timer here...
  timer.start ();

  for (size_t iterations = 1;
       iterations <= n_iterations;
       iterations++)
    {
      ACE_Thread::yield ();

      int result = 0;

      {
#if defined (RW_MUTEX)
        ACE_Read_Guard<ACE_RW_Thread_Mutex> g (rw_mutex);
#else
        ACE_Guard<ACE_Thread_Mutex> g (mutex);
#endif /* RW_MUTEX */
        find_last ();
#if defined (RW_MUTEX)
        if (use_try_upgrade)
          result =
            rw_mutex.tryacquire_write_upgrade ();
#endif /* RW_MUTEX */

        // True, when we were able to upgrade.
        if (result == 0 && use_try_upgrade)
          {
            //find_last (); try to find something which is not in
            //there
            upgraded++;
            continue;
          }
      }

      if (result == -1 && errno == EBUSY // we tried and failed
          || !use_try_upgrade)           // we did not try at all
        {
#if defined (RW_MUTEX)
          ACE_Write_Guard<ACE_RW_Thread_Mutex> g (rw_mutex);
#else
          ACE_Guard<ACE_Thread_Mutex> g (mutex);
#endif /* RW_MUTEX */

          not_upgraded++;
          find_last ();
        }
      else if (result == -1 && errno != EBUSY)
        ACE_ERROR ((LM_ERROR,
                    ACE_TEXT (" (%t) failure in upgrading to write lock!\n"),
                    1));
    }

  // Stop the timer.
  timer.stop ();
  timer.elapsed_time (elapsed_time);

  this->time_Calculation_.report_time (elapsed_time);

  return 0;
}

// Iterate <n_iterations> each time modifying the global data and
// checking that nobody steps on it while we can write it.

int
Writer_Task::svc (void)
{
  ACE_Profile_Timer timer;
  ACE_Profile_Timer::ACE_Elapsed_Time elapsed_time;

  barrier_.wait ();
  // Wait at the barrier

  // We start an ACE_Profile_Timer here...
  timer.start ();

  for (size_t iterations = 1;
       iterations <= n_iterations;
       iterations++)
    {
      ACE_Thread::yield ();

#if defined (RW_MUTEX)
      ACE_Write_Guard<ACE_RW_Thread_Mutex> g (rw_mutex);
#else
      ACE_Guard<ACE_Thread_Mutex> g (mutex);
#endif /* RW_MUTEX */

      find_last ();

      current_writers--;
    }

  // Stop the timer.
  timer.stop ();
  timer.elapsed_time (elapsed_time);

  this->time_Calculation_.report_time (elapsed_time);

  return 0;
}

void
Time_Calculation::report_time (ACE_Profile_Timer::ACE_Elapsed_Time &elapsed_time)
{
  ACE_Guard<ACE_Thread_Mutex> g (mutex_);

  this->times_.real_time += elapsed_time.real_time;
  this->times_.user_time += elapsed_time.user_time;
  this->times_.system_time += elapsed_time.system_time;

  this->reported_times_++;
}

void
Time_Calculation ::print_stats (void)
{
  ACE_Profile_Timer::ACE_Elapsed_Time elapsed_time = this->times_;
  u_int iterations = 1;

  if (iterations > 0)
    {
      elapsed_time.real_time *= ACE_ONE_SECOND_IN_MSECS;
      elapsed_time.user_time *= ACE_ONE_SECOND_IN_MSECS;
      elapsed_time.system_time *= ACE_ONE_SECOND_IN_MSECS;

      elapsed_time.real_time /= iterations;
      elapsed_time.user_time /= iterations;
      elapsed_time.system_time /= iterations;

      double tmp = 0.0;

      if (elapsed_time.real_time != 0.0)
        tmp = 1000 / elapsed_time.real_time;

      ACE_DEBUG ((LM_DEBUG,
                  ACE_TEXT ("\n")
                  ACE_TEXT ("\treal_time\t = %0.06f ms, \n")
                  ACE_TEXT ("\tuser_time\t = %0.06f ms, \n")
                  ACE_TEXT ("\tsystem_time\t = %0.06f ms, \n")
                  ACE_TEXT ("\t%0.00f calls/second\n"),
                  elapsed_time.real_time   < 0.0 ? 0.0 : elapsed_time.real_time,
                  elapsed_time.user_time   < 0.0 ? 0.0 : elapsed_time.user_time,
                  elapsed_time.system_time < 0.0 ? 0.0 : elapsed_time.system_time,
                  tmp < 0.0 ? 0.0 : tmp));

      ACE_DEBUG ((LM_DEBUG,
                  ACE_TEXT ("Number of reported times: %d\n"),
                  this->reported_times_));
    }
  else
    ACE_ERROR ((LM_ERROR,
                ACE_TEXT ("\tNo time stats printed.  Zero iterations or error ocurred.\n")));
}

static int
init (void)
{
  char entry[MAX_STRING_SIZE];
  ACE_CString *cString_ptr = 0;
  Element *element_ptr = 0;

  ACE_NEW_RETURN (linked_list_ptr,
                  Linked_List,
                  -1);

  for (u_int i = 0; i < n_entries; i++)
    {
      ACE_OS::sprintf (entry, "%d", i);
      ACE_NEW_RETURN (cString_ptr,
                      ACE_CString (entry),
                      -1);
      ACE_NEW_RETURN (element_ptr,
                      Element (cString_ptr),
                      -1);
      linked_list_ptr->insert_tail (element_ptr);
    }
  return 0;
}

#if defined (ACE_HAS_EXPLICIT_TEMPLATE_INSTANTIATION)
template class ACE_Atomic_Op<ACE_Thread_Mutex, int>;
template class ACE_Atomic_Op_Ex<ACE_Thread_Mutex, int>;
template class ACE_Read_Guard<ACE_RW_Mutex>;
template class ACE_Write_Guard<ACE_RW_Mutex>;
template class ACE_Guard<ACE_RW_Mutex>;
#elif defined (ACE_HAS_TEMPLATE_INSTANTIATION_PRAGMA)
#pragma instantiate ACE_Atomic_Op<ACE_Thread_Mutex, int>
#pragma instantiate ACE_Atomic_Op_Ex<ACE_Thread_Mutex, int>
#pragma instantiate ACE_Read_Guard<ACE_RW_Mutex>
#pragma instantiate ACE_Write_Guard<ACE_RW_Mutex>
#pragma instantiate ACE_Guard<ACE_RW_Mutex>
#endif /* ACE_HAS_EXPLICIT_TEMPLATE_INSTANTIATION */

#endif /* ACE_HAS_THREADS */

// Spawn off threads.

int
main (int argc, ACE_TCHAR *argv[])
{
  ACE_START_TEST (ACE_TEXT ("Upgradable_RW_Test"));
  int status = 0;

#if defined (ACE_HAS_THREADS)
  parse_args (argc, argv);
#if !defined (RW_MUTEX)
  use_try_upgrade = 0;
  // make sure that we have to acquire the write lock
#endif /* RW_MUTEX */

  current_readers = 0; // Possibly already done
  current_writers = 0; // Possibly already done

  init ();

  ACE_DEBUG ((LM_DEBUG,
              ACE_TEXT (" (%t) main thread starting\n")));

  Time_Calculation time_Calculation;
  // for the time calculation

  ACE_Barrier barrier (n_readers + n_writers);
  // for a nice start of all threads (for much contention)

  // Initialize the readers.
  Reader_Task **reader_tasks = 0;

  ACE_NEW_RETURN (reader_tasks,
                  Reader_Task *[n_readers],
                  -1);
  u_int i;

  for (i = 0;
       i < n_readers;
       i++)
    {
      ACE_NEW_RETURN (reader_tasks[i],
                      Reader_Task (time_Calculation,
                                  barrier),
                      -1);

      reader_tasks[i]->activate (thr_flags,
                                 1,
                                 0,
                                 ACE_DEFAULT_THREAD_PRIORITY);
    }

  // Create all the writers
  Writer_Task **writer_tasks = 0;

  ACE_NEW_RETURN (writer_tasks,
                  Writer_Task *[n_writers],
                  -1);

  for (i = 0;
       i < n_writers;
       i++)
    {
      ACE_NEW_RETURN (writer_tasks[i],
                      Writer_Task (time_Calculation,
                                  barrier),
                      -1);

      writer_tasks[i]->activate (thr_flags,
                                 1,
                                 0,
                                 ACE_DEFAULT_THREAD_PRIORITY);
    }

  // Wait a maximum of 1 second per iteration.
  const ACE_Time_Value max_wait (n_iterations * 1);
  const ACE_Time_Value wait_time (ACE_OS::gettimeofday () + max_wait);
  if (ACE_Thread_Manager::instance ()->wait (&wait_time) == -1)
    {
      if (errno == ETIME)
        ACE_ERROR ((LM_ERROR,
                    ACE_TEXT ("maximum wait time of %d msec exceeded\n"),
                               max_wait.msec ()));
      else
        ACE_OS::perror (ACE_TEXT ("wait"));

      status = -1;
    }

  // compute average time.
  time_Calculation.print_stats ();

  if (not_upgraded != 0 || upgraded != 0)
    ACE_DEBUG ((LM_DEBUG,
                ACE_TEXT ("upgraded to not upgraded ratio = %f \n"),
                (float) upgraded / (float) (not_upgraded + upgraded)));

  ACE_DEBUG ((LM_DEBUG,
              ACE_TEXT ("Number of times, that find was called: %d\n"),
              find_called));


  ACE_DEBUG ((LM_DEBUG,
              ACE_TEXT (" (%t) exiting main thread\n")));

  // Delete the memory of the Double_Linked_List
  ACE_CString *cString_ptr = 0;
  Element *element_ptr = 0;

  for (i = 0;
       i < n_entries;
       i++)
    {
      if ((element_ptr = linked_list_ptr->delete_head ()))
        {
          cString_ptr = element_ptr->value ();
          delete cString_ptr;
          delete element_ptr;
        }
    }

  delete linked_list_ptr;

  for (i = 0;
       i < n_writers;
       i++)
    delete writer_tasks[i];

  delete [] writer_tasks;

  for (i = 0;
       i < n_readers;
       i++)
    delete reader_tasks [i];

  delete [] reader_tasks;
#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 status;
}

#if defined (ACE_HAS_EXPLICIT_TEMPLATE_INSTANTIATION)
template class ACE_Double_Linked_List<Element>;
template class ACE_Double_Linked_List_Iterator_Base<Element>;
template class ACE_Double_Linked_List_Iterator<Element>;
#elif defined (ACE_HAS_TEMPLATE_INSTANTIATION_PRAGMA)
#pragma instantiate ACE_Double_Linked_List<Element>
#pragma instantiate ACE_Double_Linked_List_Iterator_Base<Element>
#pragma instantiate ACE_Double_Linked_List_Iterator<Element>
#endif /* ACE_HAS_EXPLICIT_TEMPLATE_INSTANTIATION */