gdb/testsuite/gdb.threads/break-while-running.c

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 2014-2019 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 <pthread.h>
  19 #include <assert.h>
  20 #include <unistd.h>
  21 #include <stdlib.h>
  22
  23 pthread_barrier_t barrier;
  24
  25 volatile int second_child;
  26
  27 void
  28 breakpoint_function (void)
  29 {
  30   /* GDB sets a breakpoint in this function.  */
  31 }
  32
  33 void *
  34 child_function_0 (void *arg)
  35 {
  36   volatile unsigned int counter = 1;
  37
  38   pthread_barrier_wait (&barrier);
  39
  40   while (counter > 0)
  41     {
  42       counter++;
  43       usleep (1);
  44
  45       if (second_child)
  46         continue;
  47
  48       breakpoint_function ();
  49     }
  50
  51   pthread_exit (NULL);
  52 }
  53
  54 void *
  55 child_function_1 (void *arg)
  56 {
  57   volatile unsigned int counter = 1;
  58
  59   pthread_barrier_wait (&barrier);
  60
  61   while (counter > 0)
  62     {
  63       counter++;
  64       usleep (1);
  65
  66       if (!second_child)
  67         continue;
  68
  69       breakpoint_function ();
  70     }
  71
  72   pthread_exit (NULL);
  73 }
  74
  75 static int
  76 wait_threads (void)
  77 {
  78   return 1; /* in wait_threads */
  79 }
  80
  81 int
  82 main (void)
  83 {
  84   pthread_t child_thread[2];
  85   int res;
  86
  87   pthread_barrier_init (&barrier, NULL, 3);
  88
  89   res = pthread_create (&child_thread[0], NULL, child_function_0, NULL);
  90   assert (res == 0);
  91   res = pthread_create (&child_thread[1], NULL, child_function_1, NULL);
  92   assert (res == 0);
  93
  94   pthread_barrier_wait (&barrier);
  95   wait_threads (); /* set wait-thread breakpoint here */
  96
  97   pthread_join (child_thread[0], NULL);
  98   pthread_join (child_thread[1], NULL);
  99
 100   exit (EXIT_SUCCESS);
 101 }