regress/lib/libpthread/kill1/kill1.c

   1 /*      $NetBSD: kill1.c,v 1.1 2004/07/27 22:01:51 yamt Exp $   */
   2
   3 /*-
   4  * Copyright (c)2004 YAMAMOTO Takashi,
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28
  29 #include <err.h>
  30 #include <pthread.h>
  31 #include <signal.h>
  32 #include <stdlib.h>
  33 #include <string.h>
  34
  35 #define NTHREAD 16
  36 struct threadinfo {
  37         pthread_t id;
  38         sig_atomic_t gotsignal;
  39 } th[NTHREAD];
  40
  41 pthread_t mainthread;
  42
  43 void sighandler(int);
  44 void *f(void *);
  45 int main(int, char *[]);
  46
  47 void
  48 sighandler(int signo)
  49 {
  50         pthread_t self;
  51         int i;
  52
  53         self = pthread_self();
  54         if (self == mainthread || signo != SIGUSR1)
  55                 errx(EXIT_FAILURE, "unexpected signal");
  56
  57         for (i = 0; i < NTHREAD; i++)
  58                 if (self == th[i].id)
  59                         break;
  60
  61         if (i == NTHREAD)
  62                 errx(EXIT_FAILURE, "unknown thread");
  63
  64         th[i].gotsignal++;
  65 }
  66
  67 void *
  68 f(void *arg)
  69 {
  70         struct threadinfo volatile *t = arg;
  71
  72         while (t->gotsignal < 1) {
  73                 /* busy loop */
  74         }
  75
  76         return NULL;
  77 }
  78
  79 int
  80 main(int argc, char *argv[])
  81 {
  82         int ret;
  83         int i;
  84         pthread_t self;
  85
  86         mainthread = pthread_self();
  87
  88         if (SIG_ERR == signal(SIGUSR1, sighandler))
  89                 err(EXIT_FAILURE, "signal");
  90
  91         for (i = 0; i < NTHREAD; i++) {
  92                 ret = pthread_create(&th[i].id, NULL, f, &th[i]);
  93                 if (ret)
  94                         err(EXIT_FAILURE, "pthread_create");
  95         }
  96
  97         sched_yield();
  98
  99         self = pthread_self();
 100         if (self != mainthread)
 101                 errx(EXIT_FAILURE, "thread id changed");
 102
 103         for (i = 0; i < NTHREAD; i++) {
 104                 ret = pthread_kill(th[i].id, SIGUSR1);
 105                 if (ret)
 106                         err(EXIT_FAILURE, "pthread_kill");
 107         }
 108
 109         for (i = 0; i < NTHREAD; i++) {
 110                 ret = pthread_join(th[i].id, NULL);
 111                 if (ret)
 112                         err(EXIT_FAILURE, "pthread_join");
 113         }
 114
 115         exit(EXIT_SUCCESS);
 116 }
 117