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

   1 /* This testcase is part of GDB, the GNU debugger.
   2
   3    Copyright 2009-2014 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 callme (void)
  30 {
  31 }
  32
  33 void *
  34 child_function_3 (void *arg)
  35 {
  36   int my_number =  (long) arg;
  37   volatile int *myp = (int *) &args[my_number];
  38
  39   pthread_barrier_wait (&barrier);
  40
  41   while (*myp > 0)
  42     {
  43       (*myp) ++;
  44       callme (); /* set breakpoint thread 3 here */
  45     }
  46
  47   pthread_exit (NULL);
  48 }
  49
  50 void *
  51 child_function_2 (void *arg)
  52 {
  53   int my_number =  (long) arg;
  54   volatile int *myp = (int *) &args[my_number];
  55
  56   pthread_barrier_wait (&barrier);
  57
  58   while (*myp > 0)
  59     {
  60       (*myp) ++;
  61       callme (); /* set breakpoint thread 2 here */
  62     }
  63
  64   pthread_exit (NULL);
  65 }
  66
  67 static int
  68 wait_threads (void)
  69 {
  70   return 1; /* in wait_threads */
  71 }
  72
  73 int
  74 main ()
  75 {
  76   int res;
  77   long i;
  78
  79   /* Call these early so that PLTs for these are resolved soon,
  80      instead of in the threads.  RTLD_NOW should work as well.  */
  81   usleep (0);
  82   pthread_barrier_init (&barrier, NULL, 1);
  83   pthread_barrier_wait (&barrier);
  84
  85   pthread_barrier_init (&barrier, NULL, 2);
  86
  87   i = 0;
  88   args[i] = 1;
  89   res = pthread_create (&child_thread_2,
  90                         NULL, child_function_2, (void *) i);
  91   pthread_barrier_wait (&barrier);
  92   callme ();
  93
  94   i = 1;
  95   args[i] = 1;
  96   res = pthread_create (&child_thread_3,
  97                         NULL, child_function_3, (void *) i);
  98   pthread_barrier_wait (&barrier);
  99   wait_threads (); /* set wait-threads breakpoint here */
 100
 101   pthread_join (child_thread_2, NULL);
 102   pthread_join (child_thread_3, NULL);
 103
 104   exit(EXIT_SUCCESS);
 105 }