File: gwakeuptest.c

package info (click to toggle)
glib2.0 2.58.3-1
  • links: PTS, VCS
  • area: main
  • in suites: buster, sid
  • size: 48,444 kB
  • sloc: ansic: 452,195; xml: 16,781; python: 6,149; makefile: 3,776; sh: 1,499; perl: 1,140; cpp: 9
file content (284 lines) | stat: -rw-r--r-- 5,603 bytes parent folder | download | duplicates (3)
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
#include <glib.h>
#include <glib/gwakeup.h>
#ifdef G_OS_UNIX
#include <unistd.h>
#endif

#ifdef _WIN32
static void alarm (int sec) { }
#endif

static gboolean
check_signaled (GWakeup *wakeup)
{
  GPollFD fd;

  g_wakeup_get_pollfd (wakeup, &fd);
  return g_poll (&fd, 1, 0);
}

static void
wait_for_signaled (GWakeup *wakeup)
{
  GPollFD fd;

  g_wakeup_get_pollfd (wakeup, &fd);
  g_poll (&fd, 1, -1);
}

static void
test_semantics (void)
{
  GWakeup *wakeup;
  gint i;

  /* prevent the test from deadlocking */
  alarm (60);

  wakeup = g_wakeup_new ();
  g_assert (!check_signaled (wakeup));

  g_wakeup_signal (wakeup);
  g_assert (check_signaled (wakeup));

  g_wakeup_acknowledge (wakeup);
  g_assert (!check_signaled (wakeup));

  g_wakeup_free (wakeup);

  /* free unused */
  wakeup = g_wakeup_new ();
  g_wakeup_free (wakeup);

  /* free while signaled */
  wakeup = g_wakeup_new ();
  g_wakeup_signal (wakeup);
  g_wakeup_free (wakeup);

  /* ensure excessive signalling doesn't deadlock */
  wakeup = g_wakeup_new ();
  for (i = 0; i < 1000000; i++)
    g_wakeup_signal (wakeup);
  g_assert (check_signaled (wakeup));

  /* ensure a single acknowledgement is sufficient */
  g_wakeup_acknowledge (wakeup);
  g_assert (!check_signaled (wakeup));

  g_wakeup_free (wakeup);

  /* cancel the alarm */
  alarm (0);
}

struct token
{
  gpointer owner;
  gint ttl;
};

struct context
{
  GSList *pending_tokens;
  GMutex lock;
  GWakeup *wakeup;
  gboolean quit;
};

#define NUM_THREADS     50
#define NUM_TOKENS       5
#define TOKEN_TTL   100000

static gint num_threads = NUM_THREADS;
static gint token_ttl = TOKEN_TTL;

static struct context contexts[NUM_THREADS];
static GThread *threads[NUM_THREADS];
static GWakeup *last_token_wakeup;
static volatile gint tokens_alive;

static void
context_init (struct context *ctx)
{
  ctx->pending_tokens = NULL;
  g_mutex_init (&ctx->lock);
  ctx->wakeup = g_wakeup_new ();
  ctx->quit = FALSE;
}

static void
context_clear (struct context *ctx)
{
  g_assert (ctx->pending_tokens == NULL);
  g_assert (ctx->quit);

  g_mutex_clear (&ctx->lock);
  g_wakeup_free (ctx->wakeup);
}

static void
context_quit (struct context *ctx)
{
  ctx->quit = TRUE;
  g_wakeup_signal (ctx->wakeup);
}

static struct token *
context_pop_token (struct context *ctx)
{
  struct token *token;

  g_mutex_lock (&ctx->lock);
  token = ctx->pending_tokens->data;
  ctx->pending_tokens = g_slist_delete_link (ctx->pending_tokens,
                                             ctx->pending_tokens);
  g_mutex_unlock (&ctx->lock);

  return token;
}

static void
context_push_token (struct context *ctx,
                    struct token   *token)
{
  g_assert (token->owner == ctx);

  g_mutex_lock (&ctx->lock);
  ctx->pending_tokens = g_slist_prepend (ctx->pending_tokens, token);
  g_mutex_unlock (&ctx->lock);

  g_wakeup_signal (ctx->wakeup);
}

static void
dispatch_token (struct token *token)
{
  if (token->ttl > 0)
    {
      struct context *ctx;
      gint next_ctx;

      next_ctx = g_test_rand_int_range (0, num_threads);
      ctx = &contexts[next_ctx];
      token->owner = ctx;
      token->ttl--;

      context_push_token (ctx, token);
    }
  else
    {
      g_slice_free (struct token, token);

      if (g_atomic_int_dec_and_test (&tokens_alive))
        g_wakeup_signal (last_token_wakeup);
    }
}

static struct token *
token_new (int ttl)
{
  struct token *token;

  token = g_slice_new (struct token);
  token->ttl = ttl;

  g_atomic_int_inc (&tokens_alive);

  return token;
}

static gpointer
thread_func (gpointer data)
{
  struct context *ctx = data;

  while (!ctx->quit)
    {
      wait_for_signaled (ctx->wakeup);
      g_wakeup_acknowledge (ctx->wakeup);

      while (ctx->pending_tokens)
        {
          struct token *token;

          token = context_pop_token (ctx);
          g_assert (token->owner == ctx);
          dispatch_token (token);
        }
    }

  return NULL;
}

static void
test_threaded (void)
{
  gint i;

  if (!g_test_slow ())
    {
      num_threads = NUM_THREADS / 10;
      token_ttl = TOKEN_TTL / 10;
    }

  /* make sure we don't block forever */
  alarm (60);

  /* simple mainloop test based on GWakeup.
   *
   * create a bunch of contexts and a thread to 'run' each one.  create
   * some tokens and randomly pass them between the threads, until the
   * TTL on each token is zero.
   *
   * when no tokens are left, signal that we are done.  the mainthread
   * will then signal each worker thread to exit and join them to make
   * sure that works.
   */

  last_token_wakeup = g_wakeup_new ();

  /* create contexts, assign to threads */
  for (i = 0; i < num_threads; i++)
    {
      context_init (&contexts[i]);
      threads[i] = g_thread_new ("test", thread_func, &contexts[i]);
    }

  /* dispatch tokens */
  for (i = 0; i < NUM_TOKENS; i++)
    dispatch_token (token_new (token_ttl));

  /* wait until all tokens are gone */
  wait_for_signaled (last_token_wakeup);

  /* ask threads to quit, join them, cleanup */
  for (i = 0; i < num_threads; i++)
    {
      context_quit (&contexts[i]);
      g_thread_join (threads[i]);
      context_clear (&contexts[i]);
    }

  g_wakeup_free (last_token_wakeup);

  /* cancel alarm */
  alarm (0);
}

int
main (int argc, char **argv)
{
  g_test_init (&argc, &argv, NULL);

#ifdef TEST_EVENTFD_FALLBACK
#define TESTNAME_SUFFIX "-fallback"
#else
#define TESTNAME_SUFFIX
#endif


  g_test_add_func ("/gwakeup/semantics" TESTNAME_SUFFIX, test_semantics);
  g_test_add_func ("/gwakeup/threaded" TESTNAME_SUFFIX, test_threaded);

  return g_test_run ();
}