mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-22 19:00:07 +00:00
d6c7294ed6
2005-08-17 Robert Love <rml@novell.com> * sysdeps/unix/sysv/linux/sys/inotify.h: Add IN_MOVE_SELF event. 2005-08-19 Bruno Haible <bruno@clisp.org> * intl/localealias.c (read_alias_file): In case of failure, close the file descriptor and sort the array before returning. 2005-08-19 Ulrich Drepper <drepper@redhat.com> * malloc/Makefile: Link libmemusage.so with ld.so. * malloc/memusage.c: Use atomic operations for all counter and size computations. Handle thread stacks. * sysdeps/generic/memusage.h: Define memusage_cntr_t and memusage_size_t. * sysdeps/i386/i686/memusage.h: New file. * include/atomic.h: Define atomic_max and atomic_min. * debug/tst-chk1.c: Add tests for mbstowcs and wcstombs.
297 lines
9.1 KiB
C
297 lines
9.1 KiB
C
/* Internal macros for atomic operations for GNU C Library.
|
|
Copyright (C) 2002, 2003, 2004, 2005 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_max
|
|
# define atomic_max(mem, value) \
|
|
do { \
|
|
__typeof (*(mem)) __oldval; \
|
|
__typeof (mem) __memp = (mem); \
|
|
__typeof (*(mem)) __value = (value); \
|
|
do { \
|
|
__oldval = *__memp; \
|
|
if (__oldval >= __value) \
|
|
break; \
|
|
} while (__builtin_expect (atomic_compare_and_exchange_bool_acq (__memp, \
|
|
__value, \
|
|
__oldval),\
|
|
0)); \
|
|
} while (0)
|
|
#endif
|
|
|
|
#ifndef atomic_min
|
|
# define atomic_min(mem, value) \
|
|
do { \
|
|
__typeof (*(mem)) __oldval; \
|
|
__typeof (mem) __memp = (mem); \
|
|
__typeof (*(mem)) __value = (value); \
|
|
do { \
|
|
__oldval = *__memp; \
|
|
if (__oldval <= __value) \
|
|
break; \
|
|
} while (__builtin_expect (atomic_compare_and_exchange_bool_acq (__memp, \
|
|
__value, \
|
|
__oldval),\
|
|
0)); \
|
|
} while (0)
|
|
#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 */
|