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/* This testcase is part of GDB, the GNU debugger.
Copyright 2012-2023 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 <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <sched.h>
#include <errno.h>
#include <string.h>
#include <assert.h>
#include <stdio.h>
#include <sys/types.h>
#include <dirent.h>
#include <assert.h>
#include <unistd.h>
/* Count the number of tasks/threads in the PID thread group. */
static int
count_tasks (pid_t pid)
{
char path[100];
int count;
DIR *d;
snprintf (path, sizeof (path), "/proc/%d/task/", (int) pid);
d = opendir (path);
if (d == NULL)
return -1;
for (count = 0; readdir (d) != NULL; count++)
;
closedir (d);
/* Account for '.' and '..'. */
assert (count > 2);
return count - 2;
}
pthread_attr_t attr[CPU_SETSIZE];
pthread_t thr[CPU_SETSIZE];
static void *
mythread (void *_arg)
{
return NULL;
}
int
main ()
{
int i;
for (i = 0; i < CPU_SETSIZE; i++)
{
cpu_set_t set;
int ret;
pthread_attr_init (&attr[i]);
CPU_ZERO_S (sizeof (set), &set);
CPU_SET_S (i, sizeof (set), &set);
ret = pthread_attr_setaffinity_np (&attr[i], sizeof (set), &set);
if (ret != 0)
{
fprintf (stderr, "set_affinity: %d: %s\n", ret, strerror (ret));
exit (3);
}
ret = pthread_create (&thr[i], &attr[i], mythread, NULL);
/* Should fail with EINVAL at some point. */
if (ret != 0)
{
unsigned long t;
fprintf (stderr, "pthread_create: %d: %s\n", ret, strerror (ret));
/* Wait for all threads to exit. pthread_create spawns a
clone thread even in the failing case, as it can only try
to set the affinity after creating the thread. That new
thread is immediately canceled (because setting the
affinity fails), by killing it with a SIGCANCEL signal,
which may end up in pthread_cancel/unwind paths, which
may trigger a libgcc_s.so load, making the thread hit the
solib-event breakpoint. Now, if we would let the program
exit without waiting, sometimes it would happen that the
inferior exits just while we're handling the solib-event,
resulting in errors being thrown due to failing ptrace
call fails (with ESCHR), breaking the test. */
t = 16;
while (count_tasks (getpid ()) > 1)
{
usleep (t);
if (t < 256)
t *= 2;
}
/* Normal exit, because this is what we are expecting. */
exit (0);
}
}
/* Should not normally be reached. */
exit (1);
}
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