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/* Wait until all threads except the current thread has exited.
Copyright (C) 2021-2024 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <dirent.h>
#include <errno.h>
#include <string.h>
#include <support/check.h>
#include <support/support.h>
#include <unistd.h>
void
support_wait_for_thread_exit (void)
{
#ifdef __linux__
DIR *proc_self_task = opendir ("/proc/self/task");
TEST_VERIFY_EXIT (proc_self_task != NULL);
while (true)
{
errno = 0;
struct dirent *e = readdir (proc_self_task);
if (e == NULL && errno != 0)
FAIL_EXIT1 ("readdir: %m");
if (e == NULL)
{
/* Only the main thread remains. Testing may continue. */
closedir (proc_self_task);
return;
}
/* In some kernels, "0" entries denote a thread that has just
exited. */
if (strcmp (e->d_name, ".") == 0 || strcmp (e->d_name, "..") == 0
|| strcmp (e->d_name, "0") == 0)
continue;
int task_tid = atoi (e->d_name);
if (task_tid <= 0)
FAIL_EXIT1 ("Invalid /proc/self/task entry: %s", e->d_name);
if (task_tid == gettid ())
/* The current thread. Keep scanning for other
threads. */
continue;
/* task_tid does not refer to this thread here, i.e., there is
another running thread. */
/* Small timeout to give the thread a chance to exit. */
usleep (50 * 1000);
/* Start scanning the directory from the start. */
rewinddir (proc_self_task);
}
#else
/* Use a large timeout because we cannot verify that the thread has
exited. */
usleep (5 * 1000 * 1000);
#endif
}
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