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62 lines
2.1 KiB
C++
62 lines
2.1 KiB
C++
/* Basic platform-independent macro definitions for mutexes,
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thread-specific data and parameters for malloc.
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Copyright (C) 2003-2015 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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<http://www.gnu.org/licenses/>. */
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#ifndef _GENERIC_MALLOC_MACHINE_H
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#define _GENERIC_MALLOC_MACHINE_H
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#include <atomic.h>
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#ifndef mutex_init /* No threads, provide dummy macros */
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# define NO_THREADS
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/* The mutex functions used to do absolutely nothing, i.e. lock,
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trylock and unlock would always just return 0. However, even
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without any concurrently active threads, a mutex can be used
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legitimately as an `in use' flag. To make the code that is
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protected by a mutex async-signal safe, these macros would have to
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be based on atomic test-and-set operations, for example. */
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typedef int mutex_t;
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# define mutex_init(m) (*(m) = 0)
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# define mutex_lock(m) ({ *(m) = 1; 0; })
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# define mutex_trylock(m) (*(m) ? 1 : ((*(m) = 1), 0))
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# define mutex_unlock(m) (*(m) = 0)
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# define MUTEX_INITIALIZER (0)
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#endif /* !defined mutex_init */
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#ifndef atomic_full_barrier
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# define atomic_full_barrier() __asm ("" ::: "memory")
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#endif
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#ifndef atomic_read_barrier
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# define atomic_read_barrier() atomic_full_barrier ()
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#endif
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#ifndef atomic_write_barrier
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# define atomic_write_barrier() atomic_full_barrier ()
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#endif
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#ifndef DEFAULT_TOP_PAD
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# define DEFAULT_TOP_PAD 131072
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#endif
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#endif /* !defined(_GENERIC_MALLOC_MACHINE_H) */
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