zfs/lib/libspl/atomic.c

401 lines
9.5 KiB
C

/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or https://opensource.org/licenses/CDDL-1.0.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 2009 by Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#include <atomic.h>
/*
* These are the void returning variants
*/
#define ATOMIC_INC(name, type) \
void atomic_inc_##name(volatile type *target) \
{ \
(void) __atomic_add_fetch(target, 1, __ATOMIC_SEQ_CST); \
}
/* BEGIN CSTYLED */
ATOMIC_INC(8, uint8_t)
ATOMIC_INC(16, uint16_t)
ATOMIC_INC(32, uint32_t)
ATOMIC_INC(64, uint64_t)
ATOMIC_INC(uchar, uchar_t)
ATOMIC_INC(ushort, ushort_t)
ATOMIC_INC(uint, uint_t)
ATOMIC_INC(ulong, ulong_t)
/* END CSTYLED */
#define ATOMIC_DEC(name, type) \
void atomic_dec_##name(volatile type *target) \
{ \
(void) __atomic_sub_fetch(target, 1, __ATOMIC_SEQ_CST); \
}
/* BEGIN CSTYLED */
ATOMIC_DEC(8, uint8_t)
ATOMIC_DEC(16, uint16_t)
ATOMIC_DEC(32, uint32_t)
ATOMIC_DEC(64, uint64_t)
ATOMIC_DEC(uchar, uchar_t)
ATOMIC_DEC(ushort, ushort_t)
ATOMIC_DEC(uint, uint_t)
ATOMIC_DEC(ulong, ulong_t)
/* END CSTYLED */
#define ATOMIC_ADD(name, type1, type2) \
void atomic_add_##name(volatile type1 *target, type2 bits) \
{ \
(void) __atomic_add_fetch(target, bits, __ATOMIC_SEQ_CST); \
}
void
atomic_add_ptr(volatile void *target, ssize_t bits)
{
(void) __atomic_add_fetch((void **)target, bits, __ATOMIC_SEQ_CST);
}
/* BEGIN CSTYLED */
ATOMIC_ADD(8, uint8_t, int8_t)
ATOMIC_ADD(16, uint16_t, int16_t)
ATOMIC_ADD(32, uint32_t, int32_t)
ATOMIC_ADD(64, uint64_t, int64_t)
ATOMIC_ADD(char, uchar_t, signed char)
ATOMIC_ADD(short, ushort_t, short)
ATOMIC_ADD(int, uint_t, int)
ATOMIC_ADD(long, ulong_t, long)
/* END CSTYLED */
#define ATOMIC_SUB(name, type1, type2) \
void atomic_sub_##name(volatile type1 *target, type2 bits) \
{ \
(void) __atomic_sub_fetch(target, bits, __ATOMIC_SEQ_CST); \
}
void
atomic_sub_ptr(volatile void *target, ssize_t bits)
{
(void) __atomic_sub_fetch((void **)target, bits, __ATOMIC_SEQ_CST);
}
/* BEGIN CSTYLED */
ATOMIC_SUB(8, uint8_t, int8_t)
ATOMIC_SUB(16, uint16_t, int16_t)
ATOMIC_SUB(32, uint32_t, int32_t)
ATOMIC_SUB(64, uint64_t, int64_t)
ATOMIC_SUB(char, uchar_t, signed char)
ATOMIC_SUB(short, ushort_t, short)
ATOMIC_SUB(int, uint_t, int)
ATOMIC_SUB(long, ulong_t, long)
/* END CSTYLED */
#define ATOMIC_OR(name, type) \
void atomic_or_##name(volatile type *target, type bits) \
{ \
(void) __atomic_or_fetch(target, bits, __ATOMIC_SEQ_CST); \
}
/* BEGIN CSTYLED */
ATOMIC_OR(8, uint8_t)
ATOMIC_OR(16, uint16_t)
ATOMIC_OR(32, uint32_t)
ATOMIC_OR(64, uint64_t)
ATOMIC_OR(uchar, uchar_t)
ATOMIC_OR(ushort, ushort_t)
ATOMIC_OR(uint, uint_t)
ATOMIC_OR(ulong, ulong_t)
/* END CSTYLED */
#define ATOMIC_AND(name, type) \
void atomic_and_##name(volatile type *target, type bits) \
{ \
(void) __atomic_and_fetch(target, bits, __ATOMIC_SEQ_CST); \
}
/* BEGIN CSTYLED */
ATOMIC_AND(8, uint8_t)
ATOMIC_AND(16, uint16_t)
ATOMIC_AND(32, uint32_t)
ATOMIC_AND(64, uint64_t)
ATOMIC_AND(uchar, uchar_t)
ATOMIC_AND(ushort, ushort_t)
ATOMIC_AND(uint, uint_t)
ATOMIC_AND(ulong, ulong_t)
/* END CSTYLED */
/*
* New value returning variants
*/
#define ATOMIC_INC_NV(name, type) \
type atomic_inc_##name##_nv(volatile type *target) \
{ \
return (__atomic_add_fetch(target, 1, __ATOMIC_SEQ_CST)); \
}
/* BEGIN CSTYLED */
ATOMIC_INC_NV(8, uint8_t)
ATOMIC_INC_NV(16, uint16_t)
ATOMIC_INC_NV(32, uint32_t)
ATOMIC_INC_NV(64, uint64_t)
ATOMIC_INC_NV(uchar, uchar_t)
ATOMIC_INC_NV(ushort, ushort_t)
ATOMIC_INC_NV(uint, uint_t)
ATOMIC_INC_NV(ulong, ulong_t)
/* END CSTYLED */
#define ATOMIC_DEC_NV(name, type) \
type atomic_dec_##name##_nv(volatile type *target) \
{ \
return (__atomic_sub_fetch(target, 1, __ATOMIC_SEQ_CST)); \
}
/* BEGIN CSTYLED */
ATOMIC_DEC_NV(8, uint8_t)
ATOMIC_DEC_NV(16, uint16_t)
ATOMIC_DEC_NV(32, uint32_t)
ATOMIC_DEC_NV(64, uint64_t)
ATOMIC_DEC_NV(uchar, uchar_t)
ATOMIC_DEC_NV(ushort, ushort_t)
ATOMIC_DEC_NV(uint, uint_t)
ATOMIC_DEC_NV(ulong, ulong_t)
/* END CSTYLED */
#define ATOMIC_ADD_NV(name, type1, type2) \
type1 atomic_add_##name##_nv(volatile type1 *target, type2 bits) \
{ \
return (__atomic_add_fetch(target, bits, __ATOMIC_SEQ_CST)); \
}
void *
atomic_add_ptr_nv(volatile void *target, ssize_t bits)
{
return (__atomic_add_fetch((void **)target, bits, __ATOMIC_SEQ_CST));
}
/* BEGIN CSTYLED */
ATOMIC_ADD_NV(8, uint8_t, int8_t)
ATOMIC_ADD_NV(16, uint16_t, int16_t)
ATOMIC_ADD_NV(32, uint32_t, int32_t)
ATOMIC_ADD_NV(64, uint64_t, int64_t)
ATOMIC_ADD_NV(char, uchar_t, signed char)
ATOMIC_ADD_NV(short, ushort_t, short)
ATOMIC_ADD_NV(int, uint_t, int)
ATOMIC_ADD_NV(long, ulong_t, long)
/* END CSTYLED */
#define ATOMIC_SUB_NV(name, type1, type2) \
type1 atomic_sub_##name##_nv(volatile type1 *target, type2 bits) \
{ \
return (__atomic_sub_fetch(target, bits, __ATOMIC_SEQ_CST)); \
}
void *
atomic_sub_ptr_nv(volatile void *target, ssize_t bits)
{
return (__atomic_sub_fetch((void **)target, bits, __ATOMIC_SEQ_CST));
}
/* BEGIN CSTYLED */
ATOMIC_SUB_NV(8, uint8_t, int8_t)
ATOMIC_SUB_NV(char, uchar_t, signed char)
ATOMIC_SUB_NV(16, uint16_t, int16_t)
ATOMIC_SUB_NV(short, ushort_t, short)
ATOMIC_SUB_NV(32, uint32_t, int32_t)
ATOMIC_SUB_NV(int, uint_t, int)
ATOMIC_SUB_NV(long, ulong_t, long)
ATOMIC_SUB_NV(64, uint64_t, int64_t)
/* END CSTYLED */
#define ATOMIC_OR_NV(name, type) \
type atomic_or_##name##_nv(volatile type *target, type bits) \
{ \
return (__atomic_or_fetch(target, bits, __ATOMIC_SEQ_CST)); \
}
/* BEGIN CSTYLED */
ATOMIC_OR_NV(8, uint8_t)
ATOMIC_OR_NV(16, uint16_t)
ATOMIC_OR_NV(32, uint32_t)
ATOMIC_OR_NV(64, uint64_t)
ATOMIC_OR_NV(uchar, uchar_t)
ATOMIC_OR_NV(ushort, ushort_t)
ATOMIC_OR_NV(uint, uint_t)
ATOMIC_OR_NV(ulong, ulong_t)
/* END CSTYLED */
#define ATOMIC_AND_NV(name, type) \
type atomic_and_##name##_nv(volatile type *target, type bits) \
{ \
return (__atomic_and_fetch(target, bits, __ATOMIC_SEQ_CST)); \
}
/* BEGIN CSTYLED */
ATOMIC_AND_NV(8, uint8_t)
ATOMIC_AND_NV(16, uint16_t)
ATOMIC_AND_NV(32, uint32_t)
ATOMIC_AND_NV(64, uint64_t)
ATOMIC_AND_NV(uchar, uchar_t)
ATOMIC_AND_NV(ushort, ushort_t)
ATOMIC_AND_NV(uint, uint_t)
ATOMIC_AND_NV(ulong, ulong_t)
/* END CSTYLED */
/*
* If *tgt == exp, set *tgt = des; return old value
*
* This may not look right on the first pass (or the sixteenth), but,
* from https://gcc.gnu.org/onlinedocs/gcc/_005f_005fatomic-Builtins.html:
* > If they are not equal, the operation is a read
* > and the current contents of *ptr are written into *expected.
* And, in the converse case, exp is already *target by definition.
*/
#define ATOMIC_CAS(name, type) \
type atomic_cas_##name(volatile type *target, type exp, type des) \
{ \
__atomic_compare_exchange_n(target, &exp, des, B_FALSE, \
__ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST); \
return (exp); \
}
void *
atomic_cas_ptr(volatile void *target, void *exp, void *des)
{
__atomic_compare_exchange_n((void **)target, &exp, des, B_FALSE,
__ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST);
return (exp);
}
/* BEGIN CSTYLED */
ATOMIC_CAS(8, uint8_t)
ATOMIC_CAS(16, uint16_t)
ATOMIC_CAS(32, uint32_t)
ATOMIC_CAS(64, uint64_t)
ATOMIC_CAS(uchar, uchar_t)
ATOMIC_CAS(ushort, ushort_t)
ATOMIC_CAS(uint, uint_t)
ATOMIC_CAS(ulong, ulong_t)
/* END CSTYLED */
/*
* Swap target and return old value
*/
#define ATOMIC_SWAP(name, type) \
type atomic_swap_##name(volatile type *target, type bits) \
{ \
return (__atomic_exchange_n(target, bits, __ATOMIC_SEQ_CST)); \
}
/* BEGIN CSTYLED */
ATOMIC_SWAP(8, uint8_t)
ATOMIC_SWAP(16, uint16_t)
ATOMIC_SWAP(32, uint32_t)
ATOMIC_SWAP(64, uint64_t)
ATOMIC_SWAP(uchar, uchar_t)
ATOMIC_SWAP(ushort, ushort_t)
ATOMIC_SWAP(uint, uint_t)
ATOMIC_SWAP(ulong, ulong_t)
/* END CSTYLED */
void *
atomic_swap_ptr(volatile void *target, void *bits)
{
return (__atomic_exchange_n((void **)target, bits, __ATOMIC_SEQ_CST));
}
#ifndef _LP64
uint64_t
atomic_load_64(volatile uint64_t *target)
{
return (__atomic_load_n(target, __ATOMIC_RELAXED));
}
void
atomic_store_64(volatile uint64_t *target, uint64_t bits)
{
return (__atomic_store_n(target, bits, __ATOMIC_RELAXED));
}
#endif
int
atomic_set_long_excl(volatile ulong_t *target, uint_t value)
{
ulong_t bit = 1UL << value;
ulong_t old = __atomic_fetch_or(target, bit, __ATOMIC_SEQ_CST);
return ((old & bit) ? -1 : 0);
}
int
atomic_clear_long_excl(volatile ulong_t *target, uint_t value)
{
ulong_t bit = 1UL << value;
ulong_t old = __atomic_fetch_and(target, ~bit, __ATOMIC_SEQ_CST);
return ((old & bit) ? 0 : -1);
}
void
membar_enter(void)
{
__atomic_thread_fence(__ATOMIC_SEQ_CST);
}
void
membar_exit(void)
{
__atomic_thread_fence(__ATOMIC_SEQ_CST);
}
void
membar_sync(void)
{
__atomic_thread_fence(__ATOMIC_SEQ_CST);
}
void
membar_producer(void)
{
__atomic_thread_fence(__ATOMIC_RELEASE);
}
void
membar_consumer(void)
{
__atomic_thread_fence(__ATOMIC_ACQUIRE);
}