support: Add support_wait_for_thread_exit
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@ -83,9 +83,10 @@ libsupport-routines = \
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support_test_compare_blob \
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support_test_compare_blob \
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support_test_compare_failure \
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support_test_compare_failure \
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support_test_compare_string \
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support_test_compare_string \
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support_write_file_string \
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support_test_main \
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support_test_main \
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support_test_verify_impl \
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support_test_verify_impl \
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support_wait_for_thread_exit \
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support_write_file_string \
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temp_file \
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temp_file \
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timespec \
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timespec \
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timespec-time64 \
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timespec-time64 \
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@ -174,6 +174,10 @@ timer_t support_create_timer (uint64_t sec, long int nsec, bool repeat,
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/* Disable the timer TIMER. */
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/* Disable the timer TIMER. */
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void support_delete_timer (timer_t timer);
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void support_delete_timer (timer_t timer);
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/* Wait until all threads except the current thread have exited (as
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far as the kernel is concerned). */
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void support_wait_for_thread_exit (void);
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struct support_stack
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struct support_stack
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{
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{
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void *stack;
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void *stack;
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72
support/support_wait_for_thread_exit.c
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72
support/support_wait_for_thread_exit.c
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@ -0,0 +1,72 @@
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/* Wait until all threads except the current thread has exited.
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Copyright (C) 2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <dirent.h>
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#include <errno.h>
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#include <string.h>
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#include <support/check.h>
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#include <support/support.h>
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#include <unistd.h>
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void
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support_wait_for_thread_exit (void)
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{
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#ifdef __linux__
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DIR *proc_self_task = opendir ("/proc/self/task");
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TEST_VERIFY_EXIT (proc_self_task != NULL);
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while (true)
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{
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errno = 0;
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struct dirent *e = readdir (proc_self_task);
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if (e == NULL && errno != 0)
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FAIL_EXIT1 ("readdir: %m");
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if (e == NULL)
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{
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/* Only the main thread remains. Testing may continue. */
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closedir (proc_self_task);
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return;
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}
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if (strcmp (e->d_name, ".") == 0 || strcmp (e->d_name, "..") == 0)
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continue;
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int task_tid = atoi (e->d_name);
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if (task_tid <= 0)
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FAIL_EXIT1 ("Invalid /proc/self/task entry: %s", e->d_name);
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if (task_tid == gettid ())
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/* The current thread. Keep scanning for other
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threads. */
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continue;
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/* task_tid does not refer to this thread here, i.e., there is
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another running thread. */
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/* Small timeout to give the thread a chance to exit. */
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usleep (50 * 1000);
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/* Start scanning the directory from the start. */
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rewinddir (proc_self_task);
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}
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#else
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/* Use a large timeout because we cannot verify that the thread has
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exited. */
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usleep (5 * 1000 * 1000);
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#endif
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}
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