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3dd2cbfa35
commit 7fec8a5de6
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date: Thu Nov 13 14:26:08 2025 -0300
Revert __HAVE_64B_ATOMICS configure check
uses 64-bit atomic operations on sem_t if 64-bit atomics are supported.
But sem_t may be aligned to 32-bit on 32-bit architectures.
1. Add a macro, SEM_T_ALIGN, for sem_t alignment.
2. Add a macro, HAVE_UNALIGNED_64B_ATOMICS. Define it if unaligned 64-bit
atomic operations are supported.
3. Add a macro, USE_64B_ATOMICS_ON_SEM_T. Define to 1 if 64-bit atomic
operations are supported and SEM_T_ALIGN is at least 8-byte aligned or
HAVE_UNALIGNED_64B_ATOMICS is defined.
4. Assert that size and alignment of sem_t are not lower than those of
the internal struct new_sem.
5. Check USE_64B_ATOMICS_ON_SEM_T, instead of USE_64B_ATOMICS, when using
64-bit atomic operations on sem_t.
This fixes BZ #33632.
Reviewed-by: Wilco Dijkstra <Wilco.Dijkstra@arm.com>
106 lines
2.2 KiB
C
106 lines
2.2 KiB
C
/* Test of semaphores.
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Copyright (C) 2007-2025 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 <semaphore.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <pthread.h>
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#include <internaltypes.h>
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#ifndef SEM_WAIT
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# define SEM_WAIT(s) sem_wait (s)
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#endif
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static void *
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tf (void *arg)
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{
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#ifdef TF_PREPARE
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TF_PREPARE
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#endif
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SEM_WAIT (arg);
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return NULL;
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}
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int
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do_test (void)
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{
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int tries = 5;
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pthread_t th;
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union
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{
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sem_t s;
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struct new_sem ns;
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} u;
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again:
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if (sem_init (&u.s, 0, 0) != 0)
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{
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puts ("sem_init failed");
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return 1;
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}
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#if USE_64B_ATOMICS_ON_SEM_T
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if ((u.ns.data >> SEM_NWAITERS_SHIFT) != 0)
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#else
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if (u.ns.nwaiters != 0)
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#endif
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{
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puts ("nwaiters not initialized");
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return 1;
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}
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if (pthread_create (&th, NULL, tf, &u.s) != 0)
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{
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puts ("pthread_create failed");
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return 1;
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}
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sleep (1);
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if (pthread_cancel (th) != 0)
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{
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puts ("pthread_cancel failed");
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return 1;
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}
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void *r;
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if (pthread_join (th, &r) != 0)
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{
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puts ("pthread_join failed");
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return 1;
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}
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if (r != PTHREAD_CANCELED && --tries > 0)
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{
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/* Maybe we get the scheduling right the next time. */
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sem_destroy (&u.s);
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goto again;
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}
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#if USE_64B_ATOMICS_ON_SEM_T
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if ((u.ns.data >> SEM_NWAITERS_SHIFT) != 0)
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#else
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if (u.ns.nwaiters != 0)
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#endif
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{
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puts ("nwaiters not reset");
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return 1;
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}
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return 0;
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}
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#include <support/test-driver.c>
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