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1 /* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
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2 *
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3 * Permission is hereby granted, free of charge, to any person obtaining a copy
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4 * of this software and associated documentation files (the "Software"), to
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5 * deal in the Software without restriction, including without limitation the
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6 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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7 * sell copies of the Software, and to permit persons to whom the Software is
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8 * furnished to do so, subject to the following conditions:
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9 *
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10 * The above copyright notice and this permission notice shall be included in
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11 * all copies or substantial portions of the Software.
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12 *
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13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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14 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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15 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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16 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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17 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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18 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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19 * IN THE SOFTWARE.
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20 */
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21
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22 #include "task.h"
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23 #include "uv.h"
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24
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25 #include <stdio.h>
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26 #include <stdlib.h>
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27
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28 #define NUM_PINGS (1000 * 1000)
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29 #define ACCESS_ONCE(type, var) (*(volatile type*) &(var))
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30
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31 static unsigned int callbacks;
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32 static volatile int done;
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33
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34 static const char running[] = "running";
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35 static const char stop[] = "stop";
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36 static const char stopped[] = "stopped";
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37
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38
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39 static void async_cb(uv_async_t* handle) {
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40 if (++callbacks == NUM_PINGS) {
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41 /* Tell the pummel thread to stop. */
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42 ACCESS_ONCE(const char*, handle->data) = stop;
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43
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44 /* Wait for the pummel thread to acknowledge that it has stoppped. */
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45 while (ACCESS_ONCE(const char*, handle->data) != stopped)
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46 uv_sleep(0);
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47
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48 uv_close((uv_handle_t*) handle, NULL);
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49 }
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50 }
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51
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52
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53 static void pummel(void* arg) {
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54 uv_async_t* handle = (uv_async_t*) arg;
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55
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56 while (ACCESS_ONCE(const char*, handle->data) == running)
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57 uv_async_send(handle);
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58
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59 /* Acknowledge that we've seen handle->data change. */
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60 ACCESS_ONCE(const char*, handle->data) = stopped;
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61 }
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62
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63
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64 static int test_async_pummel(int nthreads) {
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65 char fmtbuf[2][32];
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66 uv_thread_t* tids;
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67 uv_async_t handle;
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68 uint64_t time;
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69 int i;
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70
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71 tids = calloc(nthreads, sizeof(tids[0]));
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72 ASSERT_NOT_NULL(tids);
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73
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74 ASSERT_OK(uv_async_init(uv_default_loop(), &handle, async_cb));
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75 ACCESS_ONCE(const char*, handle.data) = running;
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76
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77 for (i = 0; i < nthreads; i++)
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78 ASSERT_OK(uv_thread_create(tids + i, pummel, &handle));
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79
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80 time = uv_hrtime();
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81
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82 ASSERT_OK(uv_run(uv_default_loop(), UV_RUN_DEFAULT));
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83
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84 time = uv_hrtime() - time;
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85 done = 1;
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86
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87 for (i = 0; i < nthreads; i++)
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88 ASSERT_OK(uv_thread_join(tids + i));
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89
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90 printf("async_pummel_%d: %s callbacks in %.2f seconds (%s/sec)\n",
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91 nthreads,
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92 fmt(&fmtbuf[0], callbacks),
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93 time / 1e9,
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94 fmt(&fmtbuf[1], callbacks / (time / 1e9)));
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95
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96 free(tids);
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97
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98 MAKE_VALGRIND_HAPPY(uv_default_loop());
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99 return 0;
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100 }
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101
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102
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103 BENCHMARK_IMPL(async_pummel_1) {
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104 return test_async_pummel(1);
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105 }
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106
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107
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108 BENCHMARK_IMPL(async_pummel_2) {
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109 return test_async_pummel(2);
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110 }
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111
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112
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113 BENCHMARK_IMPL(async_pummel_4) {
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114 return test_async_pummel(4);
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115 }
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116
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117
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118 BENCHMARK_IMPL(async_pummel_8) {
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119 return test_async_pummel(8);
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120 }
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