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032d74ea | 1 | /* Wait until all threads except the current thread has exited. |
581c785b | 2 | Copyright (C) 2021-2022 Free Software Foundation, Inc. |
032d74ea FW |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
17 | <https://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #include <dirent.h> | |
20 | #include <errno.h> | |
21 | #include <string.h> | |
22 | #include <support/check.h> | |
23 | #include <support/support.h> | |
24 | #include <unistd.h> | |
25 | ||
26 | void | |
27 | support_wait_for_thread_exit (void) | |
28 | { | |
29 | #ifdef __linux__ | |
30 | DIR *proc_self_task = opendir ("/proc/self/task"); | |
31 | TEST_VERIFY_EXIT (proc_self_task != NULL); | |
32 | ||
33 | while (true) | |
34 | { | |
35 | errno = 0; | |
36 | struct dirent *e = readdir (proc_self_task); | |
37 | if (e == NULL && errno != 0) | |
38 | FAIL_EXIT1 ("readdir: %m"); | |
39 | if (e == NULL) | |
40 | { | |
41 | /* Only the main thread remains. Testing may continue. */ | |
42 | closedir (proc_self_task); | |
43 | return; | |
44 | } | |
45 | ||
176c88f5 FW |
46 | /* In some kernels, "0" entries denote a thread that has just |
47 | exited. */ | |
48 | if (strcmp (e->d_name, ".") == 0 || strcmp (e->d_name, "..") == 0 | |
49 | || strcmp (e->d_name, "0") == 0) | |
032d74ea FW |
50 | continue; |
51 | ||
52 | int task_tid = atoi (e->d_name); | |
53 | if (task_tid <= 0) | |
54 | FAIL_EXIT1 ("Invalid /proc/self/task entry: %s", e->d_name); | |
55 | ||
56 | if (task_tid == gettid ()) | |
57 | /* The current thread. Keep scanning for other | |
58 | threads. */ | |
59 | continue; | |
60 | ||
61 | /* task_tid does not refer to this thread here, i.e., there is | |
62 | another running thread. */ | |
63 | ||
64 | /* Small timeout to give the thread a chance to exit. */ | |
65 | usleep (50 * 1000); | |
66 | ||
67 | /* Start scanning the directory from the start. */ | |
68 | rewinddir (proc_self_task); | |
69 | } | |
70 | #else | |
71 | /* Use a large timeout because we cannot verify that the thread has | |
72 | exited. */ | |
73 | usleep (5 * 1000 * 1000); | |
74 | #endif | |
75 | } |