gdb/testsuite/gdb.threads/signal-command-multiple-signals-pending.c

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 2014-2023 Free Software Foundation, Inc.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  17
  18 #include <stdio.h>
  19 #include <unistd.h>
  20 #include <stdlib.h>
  21 #include <pthread.h>
  22 #include <signal.h>
  23
  24 pthread_barrier_t barrier;
  25 sig_atomic_t got_sigusr1;
  26 sig_atomic_t got_sigusr2;
  27
  28 void
  29 handler_sigusr1 (int sig)
  30 {
  31   got_sigusr1 = 1;
  32 }
  33
  34 void
  35 handler_sigusr2 (int sig)
  36 {
  37   got_sigusr2 = 1;
  38 }
  39
  40 void *
  41 thread_function (void *arg)
  42 {
  43   volatile unsigned int count = 1;
  44
  45   pthread_barrier_wait (&barrier);
  46
  47   while (count++ != 0)
  48     {
  49       if (got_sigusr1 && got_sigusr2)
  50         break;
  51       usleep (1);
  52     }
  53 }
  54
  55 void
  56 all_threads_started (void)
  57 {
  58 }
  59
  60 void
  61 all_threads_signalled (void)
  62 {
  63 }
  64
  65 void
  66 end (void)
  67 {
  68 }
  69
  70 int
  71 main (void)
  72 {
  73   pthread_t child_thread[2];
  74   int i;
  75
  76   signal (SIGUSR1, handler_sigusr1);
  77   signal (SIGUSR2, handler_sigusr2);
  78
  79   for (i = 0; i < 2; i++)
  80     {
  81       pthread_barrier_init (&barrier, NULL, 2);
  82       pthread_create (&child_thread[i], NULL, thread_function, NULL);
  83       pthread_barrier_wait (&barrier);
  84       pthread_barrier_destroy (&barrier);
  85     }
  86
  87   all_threads_started ();
  88
  89   pthread_kill (child_thread[0], SIGUSR1);
  90   pthread_kill (child_thread[1], SIGUSR2);
  91
  92   all_threads_signalled ();
  93
  94   for (i = 0; i < 2; i++)
  95     pthread_join (child_thread[i], NULL);
  96
  97   end ();
  98   return 0;
  99 }