aboutsummaryrefslogtreecommitdiffhomepage
path: root/test/core/support/spinlock_test.c
blob: 96055e9bd785ebd5b5f4873e3dc5e195c69bee9e (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
/*
 *
 * Copyright 2017, 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.
 *
 */

/* Test of gpr synchronization support. */

#include "src/core/lib/support/spinlock.h"
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include <grpc/support/sync.h>
#include <grpc/support/thd.h>
#include <grpc/support/time.h>
#include <stdio.h>
#include <stdlib.h>
#include "test/core/util/test_config.h"

/* ------------------------------------------------- */
/* Tests for gpr_spinlock. */
struct test {
  int thread_count; /* number of threads */
  gpr_thd_id *threads;

  int64_t iterations; /* number of iterations per thread */
  int64_t counter;
  int incr_step; /* how much to increment/decrement refcount each time */

  gpr_spinlock mu; /* protects iterations, counter */
};

/* Return pointer to a new struct test. */
static struct test *test_new(int threads, int64_t iterations, int incr_step) {
  struct test *m = gpr_malloc(sizeof(*m));
  m->thread_count = threads;
  m->threads = gpr_malloc(sizeof(*m->threads) * (size_t)threads);
  m->iterations = iterations;
  m->counter = 0;
  m->thread_count = 0;
  m->incr_step = incr_step;
  m->mu = GPR_SPINLOCK_INITIALIZER;
  return m;
}

/* Return pointer to a new struct test. */
static void test_destroy(struct test *m) {
  gpr_free(m->threads);
  gpr_free(m);
}

/* Create m->threads threads, each running (*body)(m) */
static void test_create_threads(struct test *m, void (*body)(void *arg)) {
  int i;
  for (i = 0; i != m->thread_count; i++) {
    gpr_thd_options opt = gpr_thd_options_default();
    gpr_thd_options_set_joinable(&opt);
    GPR_ASSERT(gpr_thd_new(&m->threads[i], body, m, &opt));
  }
}

/* Wait until all threads report done. */
static void test_wait(struct test *m) {
  int i;
  for (i = 0; i != m->thread_count; i++) {
    gpr_thd_join(m->threads[i]);
  }
}

/* Test several threads running (*body)(struct test *m) for increasing settings
   of m->iterations, until about timeout_s to 2*timeout_s seconds have elapsed.
   If extra!=NULL, run (*extra)(m) in an additional thread.
   incr_step controls by how much m->refcount should be incremented/decremented
   (if at all) each time in the tests.
   */
static void test(const char *name, void (*body)(void *m), int timeout_s,
                 int incr_step) {
  int64_t iterations = 1024;
  struct test *m;
  gpr_timespec start = gpr_now(GPR_CLOCK_REALTIME);
  gpr_timespec time_taken;
  gpr_timespec deadline = gpr_time_add(
      start, gpr_time_from_micros((int64_t)timeout_s * 1000000, GPR_TIMESPAN));
  fprintf(stderr, "%s:", name);
  while (gpr_time_cmp(gpr_now(GPR_CLOCK_REALTIME), deadline) < 0) {
    if (iterations < INT64_MAX / 2) iterations <<= 1;
    fprintf(stderr, " %ld", (long)iterations);
    m = test_new(10, iterations, incr_step);
    test_create_threads(m, body);
    test_wait(m);
    if (m->counter != m->thread_count * m->iterations * m->incr_step) {
      fprintf(stderr, "counter %ld  threads %d  iterations %ld\n",
              (long)m->counter, m->thread_count, (long)m->iterations);
      GPR_ASSERT(0);
    }
    test_destroy(m);
  }
  time_taken = gpr_time_sub(gpr_now(GPR_CLOCK_REALTIME), start);
  fprintf(stderr, " done %lld.%09d s\n", (long long)time_taken.tv_sec,
          (int)time_taken.tv_nsec);
}

/* Increment m->counter on each iteration; then mark thread as done.  */
static void inc(void *v /*=m*/) {
  struct test *m = v;
  int64_t i;
  for (i = 0; i != m->iterations; i++) {
    gpr_spinlock_lock(&m->mu);
    m->counter++;
    gpr_spinlock_unlock(&m->mu);
  }
}

/* Increment m->counter under lock acquired with trylock, m->iterations times;
   then mark thread as done.  */
static void inctry(void *v /*=m*/) {
  struct test *m = v;
  int64_t i;
  for (i = 0; i != m->iterations;) {
    if (gpr_spinlock_trylock(&m->mu)) {
      m->counter++;
      gpr_spinlock_unlock(&m->mu);
      i++;
    }
  }
}

/* ------------------------------------------------- */

int main(int argc, char *argv[]) {
  grpc_test_init(argc, argv);
  test("spinlock", &inc, 1, 1);
  test("spinlock try", &inctry, 1, 1);
  return 0;
}