overby.me
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1/*-
2 * Copyright (c) 2011, Mark Heily <mark@heily.com>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice unmodified, this list of conditions, and the following
10 * disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 *
26 */
27
28#include <err.h>
29#include <stdio.h>
30#include <stdlib.h>
31#include <unistd.h>
32
33#include <pthread_workqueue.h>
34
35void f(void *arg)
36{
37 long x = (long) arg;
38
39 printf("worker %ld running\n", x);
40 sleep(1);
41 printf("worker %ld finished\n", x);
42}
43
44void run_idle_test(pthread_workqueue_t wq)
45{
46 long i;
47 int rv;
48
49 for (i = 0; i < 100; i++) {
50 rv = pthread_workqueue_additem_np(wq, f, (void *) i, NULL, NULL);
51 if (rv != 0) abort();
52 }
53
54 sleep(2);
55
56 int rounds = 0;
57 for (;;) {
58 unsigned long idle = pthread_workqueue_peek_np("combined_idle");
59 unsigned long norml_idle = pthread_workqueue_peek_np("idle");
60 unsigned long ocomm_idle = pthread_workqueue_peek_np("ocomm_idle");
61 printf("idle = %lu (overcommit = %lu non-overcommit = %lu)\n",
62 idle, ocomm_idle, norml_idle);
63 if (idle == 0 || (norml_idle == 1 && ocomm_idle == 0))
64 break;
65
66 sleep(1);
67 if (rounds++ > 240) {
68 printf("\n*** ERROR: idle threads were not reaped properly\n");
69 exit(1);
70 }
71 }
72}
73
74/*
75 * Enqueue a large number of short-lived workitems, to allow observation
76 * of how idle threads are terminated.
77 */
78int main(int argc, char *argv[])
79{
80 pthread_workqueue_t wq;
81 pthread_workqueue_t ocwq;
82 pthread_workqueue_attr_t attr;
83 pthread_workqueue_attr_t ocattr;
84 int i, rounds;
85 int rv;
86
87 if (argc == 2)
88 rounds = atoi(argv[1]);
89 else
90 rounds = 1;
91
92 pthread_workqueue_attr_init_np(&attr);
93 pthread_workqueue_attr_setovercommit_np(&attr, 0);
94 rv = pthread_workqueue_create_np(&wq, &attr);
95 if (rv != 0) abort();
96
97 pthread_workqueue_attr_init_np(&ocattr);
98 pthread_workqueue_attr_setovercommit_np(&ocattr, 1);
99 rv = pthread_workqueue_create_np(&ocwq, &ocattr);
100 if (rv != 0) abort();
101
102 for (i = 0; i < rounds; i++) {
103 run_idle_test(wq);
104 run_idle_test(ocwq);
105 }
106 printf("\n---\nOK: all excess idle threads have been terminated after %d rounds.\n", rounds);
107 exit(0);
108}