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Diffstat (limited to 'nptl/tst-rwlock15.c')
-rw-r--r-- | nptl/tst-rwlock15.c | 116 |
1 files changed, 0 insertions, 116 deletions
diff --git a/nptl/tst-rwlock15.c b/nptl/tst-rwlock15.c deleted file mode 100644 index 78225fea27..0000000000 --- a/nptl/tst-rwlock15.c +++ /dev/null @@ -1,116 +0,0 @@ -/* Copyright (C) 2015-2017 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 - <http://www.gnu.org/licenses/>. */ - -/* This tests that a writer that is preferred -- but times out due to a - reader being present -- does not miss to wake other readers blocked on the - writer's pending lock acquisition. */ - -#include <errno.h> -#include <pthread.h> -#include <stdio.h> -#include <stdlib.h> -#include <time.h> - -/* The bug existed in the code that strictly prefers writers over readers. */ -static pthread_rwlock_t r = PTHREAD_RWLOCK_WRITER_NONRECURSIVE_INITIALIZER_NP; - -static void * -writer (void *arg) -{ - struct timespec ts; - if (clock_gettime (CLOCK_REALTIME, &ts) != 0) - { - puts ("clock_gettime failed"); - exit (EXIT_FAILURE); - } - ts.tv_sec += 1; - int e = pthread_rwlock_timedwrlock (&r, &ts); - if (e != ETIMEDOUT) - { - puts ("timedwrlock did not time out"); - exit (EXIT_FAILURE); - } - return NULL; -} - -static void * -reader (void *arg) -{ - /* This isn't a reliable way to get the interleaving we need (because a - failed trylock doesn't synchronize with the writer, and because we could - try to lock after the writer has already timed out). However, both will - just lead to false positives. */ - int e; - while ((e = pthread_rwlock_tryrdlock (&r)) != EBUSY) - { - if (e != 0) - exit (EXIT_FAILURE); - pthread_rwlock_unlock (&r); - } - e = pthread_rwlock_rdlock (&r); - if (e != 0) - { - puts ("reader rdlock failed"); - exit (EXIT_FAILURE); - } - pthread_rwlock_unlock (&r); - return NULL; -} - - -static int -do_test (void) -{ - /* Grab a rdlock, then create a writer and a reader, and wait until they - finished. */ - - if (pthread_rwlock_rdlock (&r) != 0) - { - puts ("initial rdlock failed"); - return 1; - } - - pthread_t thw; - if (pthread_create (&thw, NULL, writer, NULL) != 0) - { - puts ("create failed"); - return 1; - } - pthread_t thr; - if (pthread_create (&thr, NULL, reader, NULL) != 0) - { - puts ("create failed"); - return 1; - } - - if (pthread_join (thw, NULL) != 0) - { - puts ("writer join failed"); - return 1; - } - if (pthread_join (thr, NULL) != 0) - { - puts ("reader join failed"); - return 1; - } - - return 0; -} - - -#define TEST_FUNCTION do_test () -#include "../test-skeleton.c" |