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324c088a18
The only usage was for pthread_spin_lock, introduced by 12d2dd7060,
as a way to optimize the code for certain architectures. Now that atomic
builtins are used by default, let the compiler use the best code sequence
for the atomic exchange.
Co-authored-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Reviewed-by: Wilco Dijkstra <Wilco.Dijkstra@arm.com>
39 lines
1.3 KiB
C
39 lines
1.3 KiB
C
/* pthread_spin_trylock -- trylock a spin lock. Generic version.
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Copyright (C) 2012-2025 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 <errno.h>
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#include <atomic.h>
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#include "pthreadP.h"
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#include <shlib-compat.h>
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int
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__pthread_spin_trylock (pthread_spinlock_t *lock)
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{
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if (atomic_exchange_acquire (lock, 1) == 0)
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return 0;
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return EBUSY;
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}
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versioned_symbol (libc, __pthread_spin_trylock, pthread_spin_trylock,
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GLIBC_2_34);
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#if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_2, GLIBC_2_34)
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compat_symbol (libpthread, __pthread_spin_trylock, pthread_spin_trylock,
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GLIBC_2_2);
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#endif
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