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/* This testcase is part of GDB, the GNU debugger.
Copyright 2021-2023 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/>. */
#define _GNU_SOURCE
#include <assert.h>
#include <pthread.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <signal.h>
/* Number of threads we'll create. */
int n_threads = 10;
int mypid;
static void
setup_done (void)
{
}
/* Entry point for threads. Loops forever. */
void *
thread_func (void *arg)
{
/* Avoid setting the breakpoint at an instruction that wouldn't
require a fixup phase, like a branch/jump. In such a case, even
if GDB manages to detach the inferior with an incomplete
displaced step, GDB inferior may still not crash. A breakpoint
at a line that increments a variable is good bet that we end up
setting a breakpoint at an instruction that will require a fixup
phase to move the PC from the scratch pad to the instruction
after the breakpoint. */
volatile unsigned counter = 0;
while (1)
{
counter++; /* Set breakpoint here. */
counter++;
counter++;
}
return NULL;
}
/* Allow for as much timeout as DejaGnu wants, plus a bit of
slack. */
#define SECONDS (TIMEOUT + 20)
/* We'll exit after this many seconds. */
unsigned int seconds_left = SECONDS;
/* GDB sets this whenever it's about to start a new detach/attach
sequence. We react by resetting the seconds-left counter. */
volatile int again = 0;
int
main (int argc, char **argv)
{
int i;
signal (SIGUSR1, SIG_IGN);
mypid = getpid ();
setup_done ();
if (argc > 1)
n_threads = atoi (argv[1]);
/* Spawn the test threads. */
for (i = 0; i < n_threads; ++i)
{
pthread_t child;
int rc;
rc = pthread_create (&child, NULL, thread_func, NULL);
assert (rc == 0);
}
/* Exit after a while if GDB is gone/crashes. But wait long enough
for one attach/detach sequence done by the .exp file. */
while (--seconds_left > 0)
{
sleep (1);
if (again)
{
/* GDB should be reattaching soon. Restart the timer. */
again = 0;
seconds_left = SECONDS;
}
}
printf ("timeout, exiting\n");
return 0;
}
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