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-rw-r--r--include/atomic.h261
1 files changed, 261 insertions, 0 deletions
diff --git a/include/atomic.h b/include/atomic.h
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+++ b/include/atomic.h
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+/* Internal macros for atomic operations for GNU C Library.
+ Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
+
+ 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, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#ifndef _ATOMIC_H
+#define _ATOMIC_H 1
+
+#include <stdlib.h>
+
+#include <bits/atomic.h>
+
+/* Wrapper macros to call pre_NN_post (mem, ...) where NN is the
+ bit width of *MEM. The calling macro puts parens around MEM
+ and following args. */
+#define __atomic_val_bysize(pre, post, mem, ...) \
+ ({ \
+ __typeof (*mem) __result; \
+ if (sizeof (*mem) == 1) \
+ __result = pre##_8_##post (mem, __VA_ARGS__); \
+ else if (sizeof (*mem) == 2) \
+ __result = pre##_16_##post (mem, __VA_ARGS__); \
+ else if (sizeof (*mem) == 4) \
+ __result = pre##_32_##post (mem, __VA_ARGS__); \
+ else if (sizeof (*mem) == 8) \
+ __result = pre##_64_##post (mem, __VA_ARGS__); \
+ else \
+ abort (); \
+ __result; \
+ })
+#define __atomic_bool_bysize(pre, post, mem, ...) \
+ ({ \
+ int __result; \
+ if (sizeof (*mem) == 1) \
+ __result = pre##_8_##post (mem, __VA_ARGS__); \
+ else if (sizeof (*mem) == 2) \
+ __result = pre##_16_##post (mem, __VA_ARGS__); \
+ else if (sizeof (*mem) == 4) \
+ __result = pre##_32_##post (mem, __VA_ARGS__); \
+ else if (sizeof (*mem) == 8) \
+ __result = pre##_64_##post (mem, __VA_ARGS__); \
+ else \
+ abort (); \
+ __result; \
+ })
+
+
+/* Atomically store NEWVAL in *MEM if *MEM is equal to OLDVAL.
+ Return the old *MEM value. */
+#if !defined atomic_compare_and_exchange_val_acq \
+ && defined __arch_compare_and_exchange_val_32_acq
+# define atomic_compare_and_exchange_val_acq(mem, newval, oldval) \
+ __atomic_val_bysize (__arch_compare_and_exchange_val,acq, \
+ mem, newval, oldval)
+#endif
+
+
+#ifndef atomic_compare_and_exchange_val_rel
+# define atomic_compare_and_exchange_val_rel(mem, newval, oldval) \
+ atomic_compare_and_exchange_val_acq (mem, newval, oldval)
+#endif
+
+
+/* Atomically store NEWVAL in *MEM if *MEM is equal to OLDVAL.
+ Return zero if *MEM was changed or non-zero if no exchange happened. */
+#ifndef atomic_compare_and_exchange_bool_acq
+# ifdef __arch_compare_and_exchange_bool_32_acq
+# define atomic_compare_and_exchange_bool_acq(mem, newval, oldval) \
+ __atomic_bool_bysize (__arch_compare_and_exchange_bool,acq, \
+ mem, newval, oldval)
+# else
+# define atomic_compare_and_exchange_bool_acq(mem, newval, oldval) \
+ ({ /* Cannot use __oldval here, because macros later in this file might \
+ call this macro with __oldval argument. */ \
+ __typeof (oldval) __old = (oldval); \
+ atomic_compare_and_exchange_val_acq (mem, newval, __old) != __old; \
+ })
+# endif
+#endif
+
+
+#ifndef atomic_compare_and_exchange_bool_rel
+# define atomic_compare_and_exchange_bool_rel(mem, newval, oldval) \
+ atomic_compare_and_exchange_bool_acq (mem, newval, oldval)
+#endif
+
+
+/* Store NEWVALUE in *MEM and return the old value. */
+#ifndef atomic_exchange_acq
+# define atomic_exchange_acq(mem, newvalue) \
+ ({ __typeof (*(mem)) __oldval; \
+ __typeof (mem) __memp = (mem); \
+ __typeof (*(mem)) __value = (newvalue); \
+ \
+ do \
+ __oldval = (*__memp); \
+ while (__builtin_expect (atomic_compare_and_exchange_bool_acq (__memp, \
+ __value, \
+ __oldval),\
+ 0)); \
+ \
+ __oldval; })
+#endif
+
+#ifndef atomic_exchange_rel
+# define atomic_exchange_rel(mem, newvalue) atomic_exchange_acq (mem, newvalue)
+#endif
+
+
+/* Add VALUE to *MEM and return the old value of *MEM. */
+#ifndef atomic_exchange_and_add
+# define atomic_exchange_and_add(mem, value) \
+ ({ __typeof (*(mem)) __oldval; \
+ __typeof (mem) __memp = (mem); \
+ __typeof (*(mem)) __value = (value); \
+ \
+ do \
+ __oldval = (*__memp); \
+ while (__builtin_expect (atomic_compare_and_exchange_bool_acq (__memp, \
+ __oldval \
+ + __value,\
+ __oldval),\
+ 0)); \
+ \
+ __oldval; })
+#endif
+
+
+#ifndef atomic_add
+# define atomic_add(mem, value) (void) atomic_exchange_and_add ((mem), (value))
+#endif
+
+
+#ifndef atomic_increment
+# define atomic_increment(mem) atomic_add ((mem), 1)
+#endif
+
+
+#ifndef atomic_increment_val
+# define atomic_increment_val(mem) (atomic_exchange_and_add ((mem), 1) + 1)
+#endif
+
+
+/* Add one to *MEM and return true iff it's now zero. */
+#ifndef atomic_increment_and_test
+# define atomic_increment_and_test(mem) \
+ (atomic_exchange_and_add ((mem), 1) + 1 == 0)
+#endif
+
+
+#ifndef atomic_decrement
+# define atomic_decrement(mem) atomic_add ((mem), -1)
+#endif
+
+
+#ifndef atomic_decrement_val
+# define atomic_decrement_val(mem) (atomic_exchange_and_add ((mem), -1) - 1)
+#endif
+
+
+/* Subtract 1 from *MEM and return true iff it's now zero. */
+#ifndef atomic_decrement_and_test
+# define atomic_decrement_and_test(mem) \
+ (atomic_exchange_and_add ((mem), -1) == 1)
+#endif
+
+
+/* Decrement *MEM if it is > 0, and return the old value. */
+#ifndef atomic_decrement_if_positive
+# define atomic_decrement_if_positive(mem) \
+ ({ __typeof (*(mem)) __oldval; \
+ __typeof (mem) __memp = (mem); \
+ \
+ do \
+ { \
+ __oldval = *__memp; \
+ if (__builtin_expect (__oldval <= 0, 0)) \
+ break; \
+ } \
+ while (__builtin_expect (atomic_compare_and_exchange_bool_acq (__memp, \
+ __oldval \
+ - 1, \
+ __oldval),\
+ 0));\
+ __oldval; })
+#endif
+
+
+#ifndef atomic_add_negative
+# define atomic_add_negative(mem, value) \
+ ({ __typeof (value) __aan_value = (value); \
+ atomic_exchange_and_add (mem, __aan_value) < -__aan_value; })
+#endif
+
+
+#ifndef atomic_add_zero
+# define atomic_add_zero(mem, value) \
+ ({ __typeof (value) __aaz_value = (value); \
+ atomic_exchange_and_add (mem, __aaz_value) == -__aaz_value; })
+#endif
+
+
+#ifndef atomic_bit_set
+# define atomic_bit_set(mem, bit) \
+ (void) atomic_bit_test_set(mem, bit)
+#endif
+
+
+#ifndef atomic_bit_test_set
+# define atomic_bit_test_set(mem, bit) \
+ ({ __typeof (*(mem)) __oldval; \
+ __typeof (mem) __memp = (mem); \
+ __typeof (*(mem)) __mask = ((__typeof (*(mem))) 1 << (bit)); \
+ \
+ do \
+ __oldval = (*__memp); \
+ while (__builtin_expect (atomic_compare_and_exchange_bool_acq (__memp, \
+ __oldval \
+ | __mask, \
+ __oldval),\
+ 0)); \
+ \
+ __oldval & __mask; })
+#endif
+
+
+#ifndef atomic_full_barrier
+# define atomic_full_barrier() __asm ("" ::: "memory")
+#endif
+
+
+#ifndef atomic_read_barrier
+# define atomic_read_barrier() atomic_full_barrier ()
+#endif
+
+
+#ifndef atomic_write_barrier
+# define atomic_write_barrier() atomic_full_barrier ()
+#endif
+
+
+#ifndef atomic_delay
+# define atomic_delay() do { /* nothing */ } while (0)
+#endif
+
+#endif /* atomic.h */