gdb/testsuite/gdb.threads/multiple-step-overs.c

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 2009-2019 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 <unistd.h>
  20 #include <stdlib.h>
  21 #include <signal.h>
  22
  23 unsigned int args[2];
  24
  25 pthread_barrier_t barrier;
  26 pthread_t child_thread_2, child_thread_3;
  27
  28 void
  29 sigusr1_handler (int signo)
  30 {
  31 }
  32
  33 void
  34 callme (void)
  35 {
  36 }
  37
  38 void *
  39 child_function_3 (void *arg)
  40 {
  41   int my_number =  (long) arg;
  42   volatile int *myp = (int *) &args[my_number];
  43
  44   pthread_barrier_wait (&barrier);
  45
  46   while (*myp > 0)
  47     {
  48       (*myp) ++;
  49       callme (); /* set breakpoint thread 3 here */
  50     }
  51
  52   pthread_exit (NULL);
  53 }
  54
  55 void *
  56 child_function_2 (void *arg)
  57 {
  58   int my_number =  (long) arg;
  59   volatile int *myp = (int *) &args[my_number];
  60
  61   pthread_barrier_wait (&barrier);
  62
  63   while (*myp > 0)
  64     {
  65       (*myp) ++;
  66       callme (); /* set breakpoint thread 2 here */
  67     }
  68
  69   pthread_exit (NULL);
  70 }
  71
  72 static int
  73 wait_threads (void)
  74 {
  75   return 1; /* in wait_threads */
  76 }
  77
  78 int
  79 main ()
  80 {
  81   int res;
  82   long i;
  83
  84   signal (SIGUSR1, sigusr1_handler);
  85
  86   /* Call these early so that PLTs for these are resolved soon,
  87      instead of in the threads.  RTLD_NOW should work as well.  */
  88   usleep (0);
  89   pthread_barrier_init (&barrier, NULL, 1);
  90   pthread_barrier_wait (&barrier);
  91
  92   pthread_barrier_init (&barrier, NULL, 2);
  93
  94   i = 0;
  95   args[i] = 1;
  96   res = pthread_create (&child_thread_2,
  97                         NULL, child_function_2, (void *) i);
  98   pthread_barrier_wait (&barrier);
  99   callme ();
 100
 101   i = 1;
 102   args[i] = 1;
 103   res = pthread_create (&child_thread_3,
 104                         NULL, child_function_3, (void *) i);
 105   pthread_barrier_wait (&barrier);
 106   wait_threads (); /* set wait-threads breakpoint here */
 107
 108   pthread_join (child_thread_2, NULL);
 109   pthread_join (child_thread_3, NULL);
 110
 111   exit(EXIT_SUCCESS);
 112 }