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706ad1e7 | 1 | /* Test support for single-thread optimizations. With threads, static version. |
2b778ceb | 2 | Copyright (C) 2020-2021 Free Software Foundation, Inc. |
706ad1e7 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 | /* This test is a stripped-down version of | |
20 | tst-single_threaded-pthread.c, without any loading of dynamic | |
21 | objects. */ | |
22 | ||
23 | #include <stdio.h> | |
24 | #include <support/check.h> | |
25 | #include <support/xthread.h> | |
26 | #include <sys/single_threaded.h> | |
27 | ||
28 | /* First barrier synchronizes main thread, thread 1, thread 2. */ | |
29 | static pthread_barrier_t barrier1; | |
30 | ||
31 | /* Second barrier synchronizes main thread, thread 2. */ | |
32 | static pthread_barrier_t barrier2; | |
33 | ||
34 | static void * | |
35 | threadfunc (void *closure) | |
36 | { | |
37 | TEST_VERIFY (!__libc_single_threaded); | |
38 | ||
39 | /* Wait for the main thread and the other thread. */ | |
40 | xpthread_barrier_wait (&barrier1); | |
41 | TEST_VERIFY (!__libc_single_threaded); | |
42 | ||
43 | /* Second thread waits on second barrier, too. */ | |
44 | if (closure != NULL) | |
45 | xpthread_barrier_wait (&barrier2); | |
46 | TEST_VERIFY (!__libc_single_threaded); | |
47 | ||
48 | return NULL; | |
49 | } | |
50 | ||
51 | static int | |
52 | do_test (void) | |
53 | { | |
54 | TEST_VERIFY (__libc_single_threaded); | |
55 | ||
56 | /* Two threads plus main thread. */ | |
57 | xpthread_barrier_init (&barrier1, NULL, 3); | |
58 | ||
59 | /* Main thread and second thread. */ | |
60 | xpthread_barrier_init (&barrier2, NULL, 2); | |
61 | ||
62 | pthread_t thr1 = xpthread_create (NULL, threadfunc, NULL); | |
63 | TEST_VERIFY (!__libc_single_threaded); | |
64 | ||
65 | pthread_t thr2 = xpthread_create (NULL, threadfunc, &thr2); | |
66 | TEST_VERIFY (!__libc_single_threaded); | |
67 | ||
68 | xpthread_barrier_wait (&barrier1); | |
69 | TEST_VERIFY (!__libc_single_threaded); | |
70 | ||
71 | /* Join first thread. This should not bring us back into | |
72 | single-threaded mode. */ | |
73 | xpthread_join (thr1); | |
74 | TEST_VERIFY (!__libc_single_threaded); | |
75 | ||
76 | /* We may be back in single-threaded mode after joining both | |
77 | threads, but this is not guaranteed. */ | |
78 | xpthread_barrier_wait (&barrier2); | |
79 | xpthread_join (thr2); | |
80 | printf ("info: __libc_single_threaded after joining all threads: %d\n", | |
81 | __libc_single_threaded); | |
82 | ||
83 | return 0; | |
84 | } | |
85 | ||
86 | #include <support/test-driver.c> |