aboutsummaryrefslogtreecommitdiffhomepage
path: root/test/core/iomgr/ev_epoll_linux_test.c
blob: 40ae91bc6de601faf5518f43b51bcfd798055808 (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
/*
 *
 * Copyright 2015, Google Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */
#include "src/core/lib/iomgr/port.h"

/* This test only relevant on linux systems where epoll() is available */
#ifdef GRPC_LINUX_EPOLL
#include "src/core/lib/iomgr/ev_epoll_linux.h"
#include "src/core/lib/iomgr/ev_posix.h"

#include <errno.h>
#include <string.h>
#include <unistd.h>

#include <grpc/support/alloc.h>
#include <grpc/support/log.h>

#include "src/core/lib/iomgr/iomgr.h"
#include "test/core/util/test_config.h"

typedef struct test_pollset {
  grpc_pollset *pollset;
  gpr_mu *mu;
} test_pollset;

typedef struct test_fd {
  int inner_fd;
  grpc_fd *fd;
} test_fd;

/* num_fds should be an even number */
static void test_fd_init(test_fd *tfds, int *fds, int num_fds) {
  int i;
  for (i = 0; i < num_fds; i++) {
    tfds[i].inner_fd = fds[i];
    tfds[i].fd = grpc_fd_create(fds[i], "test_fd");
  }
}

static void test_fd_cleanup(grpc_exec_ctx *exec_ctx, test_fd *tfds,
                            int num_fds) {
  int release_fd;
  int i;

  for (i = 0; i < num_fds; i++) {
    grpc_fd_shutdown(exec_ctx, tfds[i].fd);
    grpc_exec_ctx_flush(exec_ctx);

    grpc_fd_orphan(exec_ctx, tfds[i].fd, NULL, &release_fd, "test_fd_cleanup");
    grpc_exec_ctx_flush(exec_ctx);

    GPR_ASSERT(release_fd == tfds[i].inner_fd);
    close(tfds[i].inner_fd);
  }
}

static void test_pollset_init(test_pollset *pollsets, int num_pollsets) {
  int i;
  for (i = 0; i < num_pollsets; i++) {
    pollsets[i].pollset = gpr_malloc(grpc_pollset_size());
    grpc_pollset_init(pollsets[i].pollset, &pollsets[i].mu);
  }
}

static void destroy_pollset(grpc_exec_ctx *exec_ctx, void *p,
                            grpc_error *error) {
  grpc_pollset_destroy(p);
}

static void test_pollset_cleanup(grpc_exec_ctx *exec_ctx,
                                 test_pollset *pollsets, int num_pollsets) {
  grpc_closure destroyed;
  int i;

  for (i = 0; i < num_pollsets; i++) {
    grpc_closure_init(&destroyed, destroy_pollset, pollsets[i].pollset,
                      grpc_schedule_on_exec_ctx);
    grpc_pollset_shutdown(exec_ctx, pollsets[i].pollset, &destroyed);

    grpc_exec_ctx_flush(exec_ctx);
    gpr_free(pollsets[i].pollset);
  }
}

#define NUM_FDS 8
#define NUM_POLLSETS 4
/*
 * Cases to test:
 *  case 1) Polling islands of both fd and pollset are NULL
 *  case 2) Polling island of fd is NULL but that of pollset is not-NULL
 *  case 3) Polling island of fd is not-NULL but that of pollset is NULL
 *  case 4) Polling islands of both fd and pollset are not-NULL and:
 *     case 4.1) Polling islands of fd and pollset are equal
 *     case 4.2) Polling islands of fd and pollset are NOT-equal (This results
 *     in a merge)
 * */
static void test_add_fd_to_pollset() {
  grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
  test_fd tfds[NUM_FDS];
  int fds[NUM_FDS];
  test_pollset pollsets[NUM_POLLSETS];
  void *expected_pi = NULL;
  int i;
  int r;

  /* Create some dummy file descriptors. Currently using pipe file descriptors
   * for this test but we could use any other type of file descriptors. Also,
   * since pipe() used in this test creates two fds in each call, NUM_FDS should
   * be an even number */
  for (i = 0; i < NUM_FDS; i = i + 2) {
    r = pipe(fds + i);
    if (r != 0) {
      gpr_log(GPR_ERROR, "Error in creating pipe. %d (%s)", errno,
              strerror(errno));
      return;
    }
  }

  test_fd_init(tfds, fds, NUM_FDS);
  test_pollset_init(pollsets, NUM_POLLSETS);

  /*Step 1.
   * Create three polling islands (This will exercise test case 1 and 2) with
   * the following configuration:
   *   polling island 0 = { fds:0,1,2, pollsets:0}
   *   polling island 1 = { fds:3,4,   pollsets:1}
   *   polling island 2 = { fds:5,6,7  pollsets:2}
   *
   *Step 2.
   * Add pollset 3 to polling island 0 (by adding fds 0 and 1 to pollset 3)
   * (This will exercise test cases 3 and 4.1). The configuration becomes:
   *   polling island 0 = { fds:0,1,2, pollsets:0,3} <<< pollset 3 added here
   *   polling island 1 = { fds:3,4,   pollsets:1}
   *   polling island 2 = { fds:5,6,7  pollsets:2}
   *
   *Step 3.
   * Merge polling islands 0 and 1 by adding fd 0 to pollset 1 (This will
   * exercise test case 4.2). The configuration becomes:
   *   polling island (merged) = {fds: 0,1,2,3,4, pollsets: 0,1,3}
   *   polling island 2 = {fds: 5,6,7 pollsets: 2}
   *
   *Step 4.
   * Finally do one more merge by adding fd 3 to pollset 2.
   *   polling island (merged) = {fds: 0,1,2,3,4,5,6,7, pollsets: 0,1,2,3}
   */

  /* == Step 1 == */
  for (i = 0; i <= 2; i++) {
    grpc_pollset_add_fd(&exec_ctx, pollsets[0].pollset, tfds[i].fd);
    grpc_exec_ctx_flush(&exec_ctx);
  }

  for (i = 3; i <= 4; i++) {
    grpc_pollset_add_fd(&exec_ctx, pollsets[1].pollset, tfds[i].fd);
    grpc_exec_ctx_flush(&exec_ctx);
  }

  for (i = 5; i <= 7; i++) {
    grpc_pollset_add_fd(&exec_ctx, pollsets[2].pollset, tfds[i].fd);
    grpc_exec_ctx_flush(&exec_ctx);
  }

  /* == Step 2 == */
  for (i = 0; i <= 1; i++) {
    grpc_pollset_add_fd(&exec_ctx, pollsets[3].pollset, tfds[i].fd);
    grpc_exec_ctx_flush(&exec_ctx);
  }

  /* == Step 3 == */
  grpc_pollset_add_fd(&exec_ctx, pollsets[1].pollset, tfds[0].fd);
  grpc_exec_ctx_flush(&exec_ctx);

  /* == Step 4 == */
  grpc_pollset_add_fd(&exec_ctx, pollsets[2].pollset, tfds[3].fd);
  grpc_exec_ctx_flush(&exec_ctx);

  /* All polling islands are merged at this point */

  /* Compare Fd:0's polling island with that of all other Fds */
  expected_pi = grpc_fd_get_polling_island(tfds[0].fd);
  for (i = 1; i < NUM_FDS; i++) {
    GPR_ASSERT(grpc_are_polling_islands_equal(
        expected_pi, grpc_fd_get_polling_island(tfds[i].fd)));
  }

  /* Compare Fd:0's polling island with that of all other pollsets */
  for (i = 0; i < NUM_POLLSETS; i++) {
    GPR_ASSERT(grpc_are_polling_islands_equal(
        expected_pi, grpc_pollset_get_polling_island(pollsets[i].pollset)));
  }

  test_fd_cleanup(&exec_ctx, tfds, NUM_FDS);
  test_pollset_cleanup(&exec_ctx, pollsets, NUM_POLLSETS);
  grpc_exec_ctx_finish(&exec_ctx);
}

int main(int argc, char **argv) {
  const char *poll_strategy = NULL;
  grpc_test_init(argc, argv);
  grpc_iomgr_init();

  poll_strategy = grpc_get_poll_strategy_name();
  if (poll_strategy != NULL && strcmp(poll_strategy, "epoll") == 0) {
    test_add_fd_to_pollset();
  } else {
    gpr_log(GPR_INFO,
            "Skipping the test. The test is only relevant for 'epoll' "
            "strategy. and the current strategy is: '%s'",
            poll_strategy);
  }
  {
    grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
    grpc_iomgr_shutdown(&exec_ctx);
    grpc_exec_ctx_finish(&exec_ctx);
  }
  return 0;
}
#else /* defined(GRPC_LINUX_EPOLL) */
int main(int argc, char **argv) { return 0; }
#endif /* !defined(GRPC_LINUX_EPOLL) */