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Bahadir Balban
261
tasks/libposix/include/posix/atomic.h
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261
tasks/libposix/include/posix/atomic.h
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/* Internal macros for atomic operations for GNU C Library.
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Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#ifndef _ATOMIC_H
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#define _ATOMIC_H 1
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#include <stdlib.h>
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#include <bits/atomic.h>
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/* Wrapper macros to call pre_NN_post (mem, ...) where NN is the
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bit width of *MEM. The calling macro puts parens around MEM
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and following args. */
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#define __atomic_val_bysize(pre, post, mem, ...) \
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({ \
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__typeof (*mem) __result; \
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if (sizeof (*mem) == 1) \
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__result = pre##_8_##post (mem, __VA_ARGS__); \
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else if (sizeof (*mem) == 2) \
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__result = pre##_16_##post (mem, __VA_ARGS__); \
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else if (sizeof (*mem) == 4) \
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__result = pre##_32_##post (mem, __VA_ARGS__); \
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else if (sizeof (*mem) == 8) \
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__result = pre##_64_##post (mem, __VA_ARGS__); \
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else \
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abort (); \
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__result; \
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})
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#define __atomic_bool_bysize(pre, post, mem, ...) \
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({ \
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int __result; \
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if (sizeof (*mem) == 1) \
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__result = pre##_8_##post (mem, __VA_ARGS__); \
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else if (sizeof (*mem) == 2) \
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__result = pre##_16_##post (mem, __VA_ARGS__); \
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else if (sizeof (*mem) == 4) \
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__result = pre##_32_##post (mem, __VA_ARGS__); \
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else if (sizeof (*mem) == 8) \
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__result = pre##_64_##post (mem, __VA_ARGS__); \
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else \
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abort (); \
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__result; \
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})
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/* Atomically store NEWVAL in *MEM if *MEM is equal to OLDVAL.
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Return the old *MEM value. */
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#if !defined atomic_compare_and_exchange_val_acq \
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&& defined __arch_compare_and_exchange_val_32_acq
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# define atomic_compare_and_exchange_val_acq(mem, newval, oldval) \
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__atomic_val_bysize (__arch_compare_and_exchange_val,acq, \
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mem, newval, oldval)
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#endif
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#ifndef atomic_compare_and_exchange_val_rel
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# define atomic_compare_and_exchange_val_rel(mem, newval, oldval) \
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atomic_compare_and_exchange_val_acq (mem, newval, oldval)
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#endif
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/* Atomically store NEWVAL in *MEM if *MEM is equal to OLDVAL.
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Return zero if *MEM was changed or non-zero if no exchange happened. */
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#ifndef atomic_compare_and_exchange_bool_acq
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# ifdef __arch_compare_and_exchange_bool_32_acq
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# define atomic_compare_and_exchange_bool_acq(mem, newval, oldval) \
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__atomic_bool_bysize (__arch_compare_and_exchange_bool,acq, \
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mem, newval, oldval)
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# else
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# define atomic_compare_and_exchange_bool_acq(mem, newval, oldval) \
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({ /* Cannot use __oldval here, because macros later in this file might \
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call this macro with __oldval argument. */ \
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__typeof (oldval) __old = (oldval); \
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atomic_compare_and_exchange_val_acq (mem, newval, __old) != __old; \
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})
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# endif
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#endif
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#ifndef atomic_compare_and_exchange_bool_rel
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# define atomic_compare_and_exchange_bool_rel(mem, newval, oldval) \
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atomic_compare_and_exchange_bool_acq (mem, newval, oldval)
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#endif
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/* Store NEWVALUE in *MEM and return the old value. */
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#ifndef atomic_exchange_acq
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# define atomic_exchange_acq(mem, newvalue) \
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({ __typeof (*(mem)) __oldval; \
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__typeof (mem) __memp = (mem); \
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__typeof (*(mem)) __value = (newvalue); \
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\
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do \
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__oldval = (*__memp); \
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while (__builtin_expect (atomic_compare_and_exchange_bool_acq (__memp, \
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__value, \
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__oldval),\
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0)); \
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\
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__oldval; })
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#endif
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#ifndef atomic_exchange_rel
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# define atomic_exchange_rel(mem, newvalue) atomic_exchange_acq (mem, newvalue)
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#endif
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/* Add VALUE to *MEM and return the old value of *MEM. */
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#ifndef atomic_exchange_and_add
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# define atomic_exchange_and_add(mem, value) \
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({ __typeof (*(mem)) __oldval; \
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__typeof (mem) __memp = (mem); \
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__typeof (*(mem)) __value = (value); \
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\
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do \
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__oldval = (*__memp); \
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while (__builtin_expect (atomic_compare_and_exchange_bool_acq (__memp, \
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__oldval \
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+ __value,\
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__oldval),\
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0)); \
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\
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__oldval; })
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#endif
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#ifndef atomic_add
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# define atomic_add(mem, value) (void) atomic_exchange_and_add ((mem), (value))
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#endif
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#ifndef atomic_increment
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# define atomic_increment(mem) atomic_add ((mem), 1)
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#endif
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#ifndef atomic_increment_val
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# define atomic_increment_val(mem) (atomic_exchange_and_add ((mem), 1) + 1)
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#endif
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/* Add one to *MEM and return true iff it's now zero. */
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#ifndef atomic_increment_and_test
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# define atomic_increment_and_test(mem) \
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(atomic_exchange_and_add ((mem), 1) + 1 == 0)
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#endif
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#ifndef atomic_decrement
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# define atomic_decrement(mem) atomic_add ((mem), -1)
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#endif
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#ifndef atomic_decrement_val
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# define atomic_decrement_val(mem) (atomic_exchange_and_add ((mem), -1) - 1)
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#endif
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/* Subtract 1 from *MEM and return true iff it's now zero. */
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#ifndef atomic_decrement_and_test
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# define atomic_decrement_and_test(mem) \
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(atomic_exchange_and_add ((mem), -1) == 1)
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#endif
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/* Decrement *MEM if it is > 0, and return the old value. */
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#ifndef atomic_decrement_if_positive
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# define atomic_decrement_if_positive(mem) \
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({ __typeof (*(mem)) __oldval; \
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__typeof (mem) __memp = (mem); \
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\
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do \
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{ \
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__oldval = *__memp; \
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if (__builtin_expect (__oldval <= 0, 0)) \
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break; \
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} \
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while (__builtin_expect (atomic_compare_and_exchange_bool_acq (__memp, \
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__oldval \
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- 1, \
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__oldval),\
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0));\
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__oldval; })
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#endif
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#ifndef atomic_add_negative
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# define atomic_add_negative(mem, value) \
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({ __typeof (value) __aan_value = (value); \
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atomic_exchange_and_add (mem, __aan_value) < -__aan_value; })
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#endif
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#ifndef atomic_add_zero
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# define atomic_add_zero(mem, value) \
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({ __typeof (value) __aaz_value = (value); \
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atomic_exchange_and_add (mem, __aaz_value) == -__aaz_value; })
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#endif
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#ifndef atomic_bit_set
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# define atomic_bit_set(mem, bit) \
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(void) atomic_bit_test_set(mem, bit)
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#endif
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#ifndef atomic_bit_test_set
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# define atomic_bit_test_set(mem, bit) \
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({ __typeof (*(mem)) __oldval; \
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__typeof (mem) __memp = (mem); \
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__typeof (*(mem)) __mask = ((__typeof (*(mem))) 1 << (bit)); \
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\
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do \
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__oldval = (*__memp); \
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while (__builtin_expect (atomic_compare_and_exchange_bool_acq (__memp, \
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__oldval \
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| __mask, \
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__oldval),\
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0)); \
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\
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__oldval & __mask; })
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#endif
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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 atomic_delay
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# define atomic_delay() do { /* nothing */ } while (0)
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#endif
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#endif /* atomic.h */
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