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/* This testcase is part of GDB, the GNU debugger.
Copyright 2009-2014 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include <pthread.h>
#include <unistd.h>
#include <stdlib.h>
#include <signal.h>
unsigned int args[2];
pid_t pid;
pthread_barrier_t barrier;
pthread_t child_thread_2, child_thread_3;
void
handler (int signo)
{
/* so that thread 3 is sure to run, in case the bug is present. */
usleep (10);
}
void
callme (void)
{
}
void
block_signals (void)
{
sigset_t mask;
sigfillset (&mask);
sigprocmask (SIG_BLOCK, &mask, NULL);
}
void
unblock_signals (void)
{
sigset_t mask;
sigfillset (&mask);
sigprocmask (SIG_UNBLOCK, &mask, NULL);
}
void *
child_function_3 (void *arg)
{
int my_number = (long) arg;
volatile int *myp = (int *) &args[my_number];
pthread_barrier_wait (&barrier);
while (*myp > 0)
{
(*myp) ++; /* set breakpoint child_two here */
callme ();
}
pthread_exit (NULL);
}
void *
child_function_2 (void *arg)
{
int my_number = (long) arg;
volatile int *myp = (int *) &args[my_number];
unblock_signals ();
pthread_barrier_wait (&barrier);
while (*myp > 0)
{
(*myp) ++;
callme (); /* set breakpoint child_one here */
}
*myp = 1;
while (*myp > 0)
{
(*myp) ++;
callme ();
}
pthread_exit (NULL);
}
int
main ()
{
int res;
long i;
/* Block signals in all threads but one, so that we're sure which
thread gets the signal we send from the command line. */
block_signals ();
signal (SIGUSR1, handler);
/* Call these early so that PLTs for these are resolved soon,
instead of in the threads. RTLD_NOW should work as well. */
usleep (0);
pthread_barrier_init (&barrier, NULL, 1);
pthread_barrier_wait (&barrier);
pthread_barrier_init (&barrier, NULL, 2);
/* The test uses this global to know where to send the signal
to. */
pid = getpid ();
i = 0;
args[i] = 1;
res = pthread_create (&child_thread_2,
NULL, child_function_2, (void *) i);
pthread_barrier_wait (&barrier);
callme (); /* set wait-thread-2 breakpoint here */
i = 1;
args[i] = 1;
res = pthread_create (&child_thread_3,
NULL, child_function_3, (void *) i);
pthread_barrier_wait (&barrier);
callme (); /* set wait-thread-3 breakpoint here */
pthread_join (child_thread_2, NULL);
pthread_join (child_thread_3, NULL);
exit(EXIT_SUCCESS);
}
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