[userspace-rcu.git] / include / urcu / uatomic / generic.h

#ifndef _URCU_UATOMIC_GENERIC_H
#define _URCU_UATOMIC_GENERIC_H

/*
 * Copyright (c) 1991-1994 by Xerox Corporation.  All rights reserved.
 * Copyright (c) 1996-1999 by Silicon Graphics.  All rights reserved.
 * Copyright (c) 1999-2004 Hewlett-Packard Development Company, L.P.
 * Copyright (c) 2009      Mathieu Desnoyers
 * Copyright (c) 2010      Paolo Bonzini
 *
 * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
 * OR IMPLIED.  ANY USE IS AT YOUR OWN RISK.
 *
 * Permission is hereby granted to use or copy this program
 * for any purpose,  provided the above notices are retained on all copies.
 * Permission to modify the code and to distribute modified code is granted,
 * provided the above notices are retained, and a notice that the code was
 * modified is included with the above copyright notice.
 *
 * Code inspired from libuatomic_ops-1.2, inherited in part from the
 * Boehm-Demers-Weiser conservative garbage collector.
 */

#include <stdint.h>
#include <urcu/compiler.h>
#include <urcu/system.h>

#ifdef __cplusplus
extern "C" {
#endif

#ifndef uatomic_set
#define uatomic_set(addr, v)	((void) CMM_STORE_SHARED(*(addr), (v)))
#endif

#ifndef uatomic_read
#define uatomic_read(addr)	CMM_LOAD_SHARED(*(addr))
#endif

#if !defined __OPTIMIZE__  || defined UATOMIC_NO_LINK_ERROR
#ifdef ILLEGAL_INSTR
static inline __attribute__((always_inline))
void _uatomic_link_error(void)
{
	/*
	 * generate an illegal instruction. Cannot catch this with
	 * linker tricks when optimizations are disabled.
	 */
	__asm__ __volatile__(ILLEGAL_INSTR);
}
#else
static inline __attribute__((always_inline, __noreturn__))
void _uatomic_link_error(void)
{
	__builtin_trap();
}
#endif

#else /* #if !defined __OPTIMIZE__  || defined UATOMIC_NO_LINK_ERROR */
extern void _uatomic_link_error(void);
#endif /* #else #if !defined __OPTIMIZE__  || defined UATOMIC_NO_LINK_ERROR */

/* cmpxchg */

#ifndef uatomic_cmpxchg
static inline __attribute__((always_inline))
unsigned long _uatomic_cmpxchg(void *addr, unsigned long old,
			      unsigned long _new, int len)
{
	switch (len) {
#ifdef UATOMIC_HAS_ATOMIC_BYTE
	case 1:
		return __sync_val_compare_and_swap_1((uint8_t *) addr, old,
				_new);
#endif
#ifdef UATOMIC_HAS_ATOMIC_SHORT
	case 2:
		return __sync_val_compare_and_swap_2((uint16_t *) addr, old,
				_new);
#endif
	case 4:
		return __sync_val_compare_and_swap_4((uint32_t *) addr, old,
				_new);
#if (CAA_BITS_PER_LONG == 64)
	case 8:
		return __sync_val_compare_and_swap_8((uint64_t *) addr, old,
				_new);
#endif
	}
	_uatomic_link_error();
	return 0;
}


#define uatomic_cmpxchg(addr, old, _new)				      \
	((__typeof__(*(addr))) _uatomic_cmpxchg((addr),			      \
						caa_cast_long_keep_sign(old), \
						caa_cast_long_keep_sign(_new),\
						sizeof(*(addr))))


/* uatomic_and */

#ifndef uatomic_and
static inline __attribute__((always_inline))
void _uatomic_and(void *addr, unsigned long val,
		  int len)
{
	switch (len) {
#ifdef UATOMIC_HAS_ATOMIC_BYTE
	case 1:
		__sync_and_and_fetch_1((uint8_t *) addr, val);
		return;
#endif
#ifdef UATOMIC_HAS_ATOMIC_SHORT
	case 2:
		__sync_and_and_fetch_2((uint16_t *) addr, val);
		return;
#endif
	case 4:
		__sync_and_and_fetch_4((uint32_t *) addr, val);
		return;
#if (CAA_BITS_PER_LONG == 64)
	case 8:
		__sync_and_and_fetch_8((uint64_t *) addr, val);
		return;
#endif
	}
	_uatomic_link_error();
}

#define uatomic_and(addr, v)			\
	(_uatomic_and((addr),			\
		caa_cast_long_keep_sign(v),	\
		sizeof(*(addr))))
#define cmm_smp_mb__before_uatomic_and()	cmm_barrier()
#define cmm_smp_mb__after_uatomic_and()		cmm_barrier()

#endif

/* uatomic_or */

#ifndef uatomic_or
static inline __attribute__((always_inline))
void _uatomic_or(void *addr, unsigned long val,
		 int len)
{
	switch (len) {
#ifdef UATOMIC_HAS_ATOMIC_BYTE
	case 1:
		__sync_or_and_fetch_1((uint8_t *) addr, val);
		return;
#endif
#ifdef UATOMIC_HAS_ATOMIC_SHORT
	case 2:
		__sync_or_and_fetch_2((uint16_t *) addr, val);
		return;
#endif
	case 4:
		__sync_or_and_fetch_4((uint32_t *) addr, val);
		return;
#if (CAA_BITS_PER_LONG == 64)
	case 8:
		__sync_or_and_fetch_8((uint64_t *) addr, val);
		return;
#endif
	}
	_uatomic_link_error();
	return;
}

#define uatomic_or(addr, v)			\
	(_uatomic_or((addr),			\
		caa_cast_long_keep_sign(v),	\
		sizeof(*(addr))))
#define cmm_smp_mb__before_uatomic_or()		cmm_barrier()
#define cmm_smp_mb__after_uatomic_or()		cmm_barrier()

#endif


/* uatomic_add_return */

#ifndef uatomic_add_return
static inline __attribute__((always_inline))
unsigned long _uatomic_add_return(void *addr, unsigned long val,
				 int len)
{
	switch (len) {
#ifdef UATOMIC_HAS_ATOMIC_BYTE
	case 1:
		return __sync_add_and_fetch_1((uint8_t *) addr, val);
#endif
#ifdef UATOMIC_HAS_ATOMIC_SHORT
	case 2:
		return __sync_add_and_fetch_2((uint16_t *) addr, val);
#endif
	case 4:
		return __sync_add_and_fetch_4((uint32_t *) addr, val);
#if (CAA_BITS_PER_LONG == 64)
	case 8:
		return __sync_add_and_fetch_8((uint64_t *) addr, val);
#endif
	}
	_uatomic_link_error();
	return 0;
}


#define uatomic_add_return(addr, v)					    \
	((__typeof__(*(addr))) _uatomic_add_return((addr),		    \
						caa_cast_long_keep_sign(v), \
						sizeof(*(addr))))
#endif /* #ifndef uatomic_add_return */

#ifndef uatomic_xchg
/* xchg */

static inline __attribute__((always_inline))
unsigned long _uatomic_exchange(void *addr, unsigned long val, int len)
{
	switch (len) {
#ifdef UATOMIC_HAS_ATOMIC_BYTE
	case 1:
	{
		uint8_t old;

		do {
			old = uatomic_read((uint8_t *) addr);
		} while (!__sync_bool_compare_and_swap_1((uint8_t *) addr,
				old, val));

		return old;
	}
#endif
#ifdef UATOMIC_HAS_ATOMIC_SHORT
	case 2:
	{
		uint16_t old;

		do {
			old = uatomic_read((uint16_t *) addr);
		} while (!__sync_bool_compare_and_swap_2((uint16_t *) addr,
				old, val));

		return old;
	}
#endif
	case 4:
	{
		uint32_t old;

		do {
			old = uatomic_read((uint32_t *) addr);
		} while (!__sync_bool_compare_and_swap_4((uint32_t *) addr,
				old, val));

		return old;
	}
#if (CAA_BITS_PER_LONG == 64)
	case 8:
	{
		uint64_t old;

		do {
			old = uatomic_read((uint64_t *) addr);
		} while (!__sync_bool_compare_and_swap_8((uint64_t *) addr,
				old, val));

		return old;
	}
#endif
	}
	_uatomic_link_error();
	return 0;
}

#define uatomic_xchg(addr, v)						    \
	((__typeof__(*(addr))) _uatomic_exchange((addr),		    \
						caa_cast_long_keep_sign(v), \
						sizeof(*(addr))))
#endif /* #ifndef uatomic_xchg */

#else /* #ifndef uatomic_cmpxchg */

#ifndef uatomic_and
/* uatomic_and */

static inline __attribute__((always_inline))
void _uatomic_and(void *addr, unsigned long val, int len)
{
	switch (len) {
#ifdef UATOMIC_HAS_ATOMIC_BYTE
	case 1:
	{
		uint8_t old, oldt;

		oldt = uatomic_read((uint8_t *) addr);
		do {
			old = oldt;
			oldt = _uatomic_cmpxchg(addr, old, old & val, 1);
		} while (oldt != old);

		return;
	}
#endif
#ifdef UATOMIC_HAS_ATOMIC_SHORT
	case 2:
	{
		uint16_t old, oldt;

		oldt = uatomic_read((uint16_t *) addr);
		do {
			old = oldt;
			oldt = _uatomic_cmpxchg(addr, old, old & val, 2);
		} while (oldt != old);
	}
#endif
	case 4:
	{
		uint32_t old, oldt;

		oldt = uatomic_read((uint32_t *) addr);
		do {
			old = oldt;
			oldt = _uatomic_cmpxchg(addr, old, old & val, 4);
		} while (oldt != old);

		return;
	}
#if (CAA_BITS_PER_LONG == 64)
	case 8:
	{
		uint64_t old, oldt;

		oldt = uatomic_read((uint64_t *) addr);
		do {
			old = oldt;
			oldt = _uatomic_cmpxchg(addr, old, old & val, 8);
		} while (oldt != old);

		return;
	}
#endif
	}
	_uatomic_link_error();
}

#define uatomic_and(addr, v)			\
	(_uatomic_and((addr),			\
		caa_cast_long_keep_sign(v),	\
		sizeof(*(addr))))
#define cmm_smp_mb__before_uatomic_and()	cmm_barrier()
#define cmm_smp_mb__after_uatomic_and()		cmm_barrier()

#endif /* #ifndef uatomic_and */

#ifndef uatomic_or
/* uatomic_or */

static inline __attribute__((always_inline))
void _uatomic_or(void *addr, unsigned long val, int len)
{
	switch (len) {
#ifdef UATOMIC_HAS_ATOMIC_BYTE
	case 1:
	{
		uint8_t old, oldt;

		oldt = uatomic_read((uint8_t *) addr);
		do {
			old = oldt;
			oldt = _uatomic_cmpxchg(addr, old, old | val, 1);
		} while (oldt != old);

		return;
	}
#endif
#ifdef UATOMIC_HAS_ATOMIC_SHORT
	case 2:
	{
		uint16_t old, oldt;

		oldt = uatomic_read((uint16_t *) addr);
		do {
			old = oldt;
			oldt = _uatomic_cmpxchg(addr, old, old | val, 2);
		} while (oldt != old);

		return;
	}
#endif
	case 4:
	{
		uint32_t old, oldt;

		oldt = uatomic_read((uint32_t *) addr);
		do {
			old = oldt;
			oldt = _uatomic_cmpxchg(addr, old, old | val, 4);
		} while (oldt != old);

		return;
	}
#if (CAA_BITS_PER_LONG == 64)
	case 8:
	{
		uint64_t old, oldt;

		oldt = uatomic_read((uint64_t *) addr);
		do {
			old = oldt;
			oldt = _uatomic_cmpxchg(addr, old, old | val, 8);
		} while (oldt != old);

		return;
	}
#endif
	}
	_uatomic_link_error();
}

#define uatomic_or(addr, v)			\
	(_uatomic_or((addr),			\
		caa_cast_long_keep_sign(v),	\
		sizeof(*(addr))))
#define cmm_smp_mb__before_uatomic_or()		cmm_barrier()
#define cmm_smp_mb__after_uatomic_or()		cmm_barrier()

#endif /* #ifndef uatomic_or */

#ifndef uatomic_add_return
/* uatomic_add_return */

static inline __attribute__((always_inline))
unsigned long _uatomic_add_return(void *addr, unsigned long val, int len)
{
	switch (len) {
#ifdef UATOMIC_HAS_ATOMIC_BYTE
	case 1:
	{
		uint8_t old, oldt;

		oldt = uatomic_read((uint8_t *) addr);
		do {
			old = oldt;
			oldt = uatomic_cmpxchg((uint8_t *) addr,
                                               old, old + val);
		} while (oldt != old);

		return old + val;
	}
#endif
#ifdef UATOMIC_HAS_ATOMIC_SHORT
	case 2:
	{
		uint16_t old, oldt;

		oldt = uatomic_read((uint16_t *) addr);
		do {
			old = oldt;
			oldt = uatomic_cmpxchg((uint16_t *) addr,
                                               old, old + val);
		} while (oldt != old);

		return old + val;
	}
#endif
	case 4:
	{
		uint32_t old, oldt;

		oldt = uatomic_read((uint32_t *) addr);
		do {
			old = oldt;
			oldt = uatomic_cmpxchg((uint32_t *) addr,
                                               old, old + val);
		} while (oldt != old);

		return old + val;
	}
#if (CAA_BITS_PER_LONG == 64)
	case 8:
	{
		uint64_t old, oldt;

		oldt = uatomic_read((uint64_t *) addr);
		do {
			old = oldt;
			oldt = uatomic_cmpxchg((uint64_t *) addr,
                                               old, old + val);
		} while (oldt != old);

		return old + val;
	}
#endif
	}
	_uatomic_link_error();
	return 0;
}

#define uatomic_add_return(addr, v)					    \
	((__typeof__(*(addr))) _uatomic_add_return((addr),		    \
						caa_cast_long_keep_sign(v), \
						sizeof(*(addr))))
#endif /* #ifndef uatomic_add_return */

#ifndef uatomic_xchg
/* xchg */

static inline __attribute__((always_inline))
unsigned long _uatomic_exchange(void *addr, unsigned long val, int len)
{
	switch (len) {
#ifdef UATOMIC_HAS_ATOMIC_BYTE
	case 1:
	{
		uint8_t old, oldt;

		oldt = uatomic_read((uint8_t *) addr);
		do {
			old = oldt;
			oldt = uatomic_cmpxchg((uint8_t *) addr,
                                               old, val);
		} while (oldt != old);

		return old;
	}
#endif
#ifdef UATOMIC_HAS_ATOMIC_SHORT
	case 2:
	{
		uint16_t old, oldt;

		oldt = uatomic_read((uint16_t *) addr);
		do {
			old = oldt;
			oldt = uatomic_cmpxchg((uint16_t *) addr,
                                               old, val);
		} while (oldt != old);

		return old;
	}
#endif
	case 4:
	{
		uint32_t old, oldt;

		oldt = uatomic_read((uint32_t *) addr);
		do {
			old = oldt;
			oldt = uatomic_cmpxchg((uint32_t *) addr,
                                               old, val);
		} while (oldt != old);

		return old;
	}
#if (CAA_BITS_PER_LONG == 64)
	case 8:
	{
		uint64_t old, oldt;

		oldt = uatomic_read((uint64_t *) addr);
		do {
			old = oldt;
			oldt = uatomic_cmpxchg((uint64_t *) addr,
                                               old, val);
		} while (oldt != old);

		return old;
	}
#endif
	}
	_uatomic_link_error();
	return 0;
}

#define uatomic_xchg(addr, v)						    \
	((__typeof__(*(addr))) _uatomic_exchange((addr),		    \
						caa_cast_long_keep_sign(v), \
						sizeof(*(addr))))
#endif /* #ifndef uatomic_xchg */

#endif /* #else #ifndef uatomic_cmpxchg */

/* uatomic_sub_return, uatomic_add, uatomic_sub, uatomic_inc, uatomic_dec */

#ifndef uatomic_add
#define uatomic_add(addr, v)		(void)uatomic_add_return((addr), (v))
#define cmm_smp_mb__before_uatomic_add()	cmm_barrier()
#define cmm_smp_mb__after_uatomic_add()		cmm_barrier()
#endif

#define uatomic_sub_return(addr, v)	\
	uatomic_add_return((addr), -(caa_cast_long_keep_sign(v)))
#define uatomic_sub(addr, v)		\
	uatomic_add((addr), -(caa_cast_long_keep_sign(v)))
#define cmm_smp_mb__before_uatomic_sub()	cmm_smp_mb__before_uatomic_add()
#define cmm_smp_mb__after_uatomic_sub()		cmm_smp_mb__after_uatomic_add()

#ifndef uatomic_inc
#define uatomic_inc(addr)		uatomic_add((addr), 1)
#define cmm_smp_mb__before_uatomic_inc()	cmm_smp_mb__before_uatomic_add()
#define cmm_smp_mb__after_uatomic_inc()		cmm_smp_mb__after_uatomic_add()
#endif

#ifndef uatomic_dec
#define uatomic_dec(addr)		uatomic_add((addr), -1)
#define cmm_smp_mb__before_uatomic_dec()	cmm_smp_mb__before_uatomic_add()
#define cmm_smp_mb__after_uatomic_dec()		cmm_smp_mb__after_uatomic_add()
#endif

#ifdef __cplusplus
}
#endif

#endif /* _URCU_UATOMIC_GENERIC_H */
Commit	Line	Data
	1	#ifndef _URCU_UATOMIC_GENERIC_H
	2	#define _URCU_UATOMIC_GENERIC_H
	3
	4	/*
	5	* Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved.
	6	* Copyright (c) 1996-1999 by Silicon Graphics. All rights reserved.
	7	* Copyright (c) 1999-2004 Hewlett-Packard Development Company, L.P.
	8	* Copyright (c) 2009 Mathieu Desnoyers
	9	* Copyright (c) 2010 Paolo Bonzini
	10	*
	11	* THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
	12	* OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
	13	*
	14	* Permission is hereby granted to use or copy this program
	15	* for any purpose, provided the above notices are retained on all copies.
	16	* Permission to modify the code and to distribute modified code is granted,
	17	* provided the above notices are retained, and a notice that the code was
	18	* modified is included with the above copyright notice.
	19	*
	20	* Code inspired from libuatomic_ops-1.2, inherited in part from the
	21	* Boehm-Demers-Weiser conservative garbage collector.
	22	*/
	23
	24	#include <stdint.h>
	25	#include <urcu/compiler.h>
	26	#include <urcu/system.h>
	27
	28	#ifdef __cplusplus
	29	extern "C" {
	30	#endif
	31
	32	#ifndef uatomic_set
	33	#define uatomic_set(addr, v) ((void) CMM_STORE_SHARED(*(addr), (v)))
	34	#endif
	35
	36	#ifndef uatomic_read
	37	#define uatomic_read(addr) CMM_LOAD_SHARED(*(addr))
	38	#endif
	39
	40	#if !defined __OPTIMIZE__ \|\| defined UATOMIC_NO_LINK_ERROR
	41	#ifdef ILLEGAL_INSTR
	42	static inline __attribute__((always_inline))
	43	void _uatomic_link_error(void)
	44	{
	45	/*
	46	* generate an illegal instruction. Cannot catch this with
	47	* linker tricks when optimizations are disabled.
	48	*/
	49	__asm__ __volatile__(ILLEGAL_INSTR);
	50	}
	51	#else
	52	static inline __attribute__((always_inline, __noreturn__))
	53	void _uatomic_link_error(void)
	54	{
	55	__builtin_trap();
	56	}
	57	#endif
	58
	59	#else /* #if !defined __OPTIMIZE__ \|\| defined UATOMIC_NO_LINK_ERROR */
	60	extern void _uatomic_link_error(void);
	61	#endif /* #else #if !defined __OPTIMIZE__ \|\| defined UATOMIC_NO_LINK_ERROR */
	62
	63	/* cmpxchg */
	64
	65	#ifndef uatomic_cmpxchg
	66	static inline __attribute__((always_inline))
	67	unsigned long _uatomic_cmpxchg(void *addr, unsigned long old,
	68	unsigned long _new, int len)
	69	{
	70	switch (len) {
	71	#ifdef UATOMIC_HAS_ATOMIC_BYTE
	72	case 1:
	73	return __sync_val_compare_and_swap_1((uint8_t *) addr, old,
	74	_new);
	75	#endif
	76	#ifdef UATOMIC_HAS_ATOMIC_SHORT
	77	case 2:
	78	return __sync_val_compare_and_swap_2((uint16_t *) addr, old,
	79	_new);
	80	#endif
	81	case 4:
	82	return __sync_val_compare_and_swap_4((uint32_t *) addr, old,
	83	_new);
	84	#if (CAA_BITS_PER_LONG == 64)
	85	case 8:
	86	return __sync_val_compare_and_swap_8((uint64_t *) addr, old,
	87	_new);
	88	#endif
	89	}
	90	_uatomic_link_error();
	91	return 0;
	92	}
	93
	94
	95	#define uatomic_cmpxchg(addr, old, _new) \
	96	((__typeof__(*(addr))) _uatomic_cmpxchg((addr), \
	97	caa_cast_long_keep_sign(old), \
	98	caa_cast_long_keep_sign(_new),\
	99	sizeof(*(addr))))
	100
	101
	102	/* uatomic_and */
	103
	104	#ifndef uatomic_and
	105	static inline __attribute__((always_inline))
	106	void _uatomic_and(void *addr, unsigned long val,
	107	int len)
	108	{
	109	switch (len) {
	110	#ifdef UATOMIC_HAS_ATOMIC_BYTE
	111	case 1:
	112	__sync_and_and_fetch_1((uint8_t *) addr, val);
	113	return;
	114	#endif
	115	#ifdef UATOMIC_HAS_ATOMIC_SHORT
	116	case 2:
	117	__sync_and_and_fetch_2((uint16_t *) addr, val);
	118	return;
	119	#endif
	120	case 4:
	121	__sync_and_and_fetch_4((uint32_t *) addr, val);
	122	return;
	123	#if (CAA_BITS_PER_LONG == 64)
	124	case 8:
	125	__sync_and_and_fetch_8((uint64_t *) addr, val);
	126	return;
	127	#endif
	128	}
	129	_uatomic_link_error();
	130	}
	131
	132	#define uatomic_and(addr, v) \
	133	(_uatomic_and((addr), \
	134	caa_cast_long_keep_sign(v), \
	135	sizeof(*(addr))))
	136	#define cmm_smp_mb__before_uatomic_and() cmm_barrier()
	137	#define cmm_smp_mb__after_uatomic_and() cmm_barrier()
	138
	139	#endif
	140
	141	/* uatomic_or */
	142
	143	#ifndef uatomic_or
	144	static inline __attribute__((always_inline))
	145	void _uatomic_or(void *addr, unsigned long val,
	146	int len)
	147	{
	148	switch (len) {
	149	#ifdef UATOMIC_HAS_ATOMIC_BYTE
	150	case 1:
	151	__sync_or_and_fetch_1((uint8_t *) addr, val);
	152	return;
	153	#endif
	154	#ifdef UATOMIC_HAS_ATOMIC_SHORT
	155	case 2:
	156	__sync_or_and_fetch_2((uint16_t *) addr, val);
	157	return;
	158	#endif
	159	case 4:
	160	__sync_or_and_fetch_4((uint32_t *) addr, val);
	161	return;
	162	#if (CAA_BITS_PER_LONG == 64)
	163	case 8:
	164	__sync_or_and_fetch_8((uint64_t *) addr, val);
	165	return;
	166	#endif
	167	}
	168	_uatomic_link_error();
	169	return;
	170	}
	171
	172	#define uatomic_or(addr, v) \
	173	(_uatomic_or((addr), \
	174	caa_cast_long_keep_sign(v), \
	175	sizeof(*(addr))))
	176	#define cmm_smp_mb__before_uatomic_or() cmm_barrier()
	177	#define cmm_smp_mb__after_uatomic_or() cmm_barrier()
	178
	179	#endif
	180
	181
	182	/* uatomic_add_return */
	183
	184	#ifndef uatomic_add_return
	185	static inline __attribute__((always_inline))
	186	unsigned long _uatomic_add_return(void *addr, unsigned long val,
	187	int len)
	188	{
	189	switch (len) {
	190	#ifdef UATOMIC_HAS_ATOMIC_BYTE
	191	case 1:
	192	return __sync_add_and_fetch_1((uint8_t *) addr, val);
	193	#endif
	194	#ifdef UATOMIC_HAS_ATOMIC_SHORT
	195	case 2:
	196	return __sync_add_and_fetch_2((uint16_t *) addr, val);
	197	#endif
	198	case 4:
	199	return __sync_add_and_fetch_4((uint32_t *) addr, val);
	200	#if (CAA_BITS_PER_LONG == 64)
	201	case 8:
	202	return __sync_add_and_fetch_8((uint64_t *) addr, val);
	203	#endif
	204	}
	205	_uatomic_link_error();
	206	return 0;
	207	}
	208
	209
	210	#define uatomic_add_return(addr, v) \
	211	((__typeof__(*(addr))) _uatomic_add_return((addr), \
	212	caa_cast_long_keep_sign(v), \
	213	sizeof(*(addr))))
	214	#endif /* #ifndef uatomic_add_return */
	215
	216	#ifndef uatomic_xchg
	217	/* xchg */
	218
	219	static inline __attribute__((always_inline))
	220	unsigned long _uatomic_exchange(void *addr, unsigned long val, int len)
	221	{
	222	switch (len) {
	223	#ifdef UATOMIC_HAS_ATOMIC_BYTE
	224	case 1:
	225	{
	226	uint8_t old;
	227
	228	do {
	229	old = uatomic_read((uint8_t *) addr);
	230	} while (!__sync_bool_compare_and_swap_1((uint8_t *) addr,
	231	old, val));
	232
	233	return old;
	234	}
	235	#endif
	236	#ifdef UATOMIC_HAS_ATOMIC_SHORT
	237	case 2:
	238	{
	239	uint16_t old;
	240
	241	do {
	242	old = uatomic_read((uint16_t *) addr);
	243	} while (!__sync_bool_compare_and_swap_2((uint16_t *) addr,
	244	old, val));
	245
	246	return old;
	247	}
	248	#endif
	249	case 4:
	250	{
	251	uint32_t old;
	252
	253	do {
	254	old = uatomic_read((uint32_t *) addr);
	255	} while (!__sync_bool_compare_and_swap_4((uint32_t *) addr,
	256	old, val));
	257
	258	return old;
	259	}
	260	#if (CAA_BITS_PER_LONG == 64)
	261	case 8:
	262	{
	263	uint64_t old;
	264
	265	do {
	266	old = uatomic_read((uint64_t *) addr);
	267	} while (!__sync_bool_compare_and_swap_8((uint64_t *) addr,
	268	old, val));
	269
	270	return old;
	271	}
	272	#endif
	273	}
	274	_uatomic_link_error();
	275	return 0;
	276	}
	277
	278	#define uatomic_xchg(addr, v) \
	279	((__typeof__(*(addr))) _uatomic_exchange((addr), \
	280	caa_cast_long_keep_sign(v), \
	281	sizeof(*(addr))))
	282	#endif /* #ifndef uatomic_xchg */
	283
	284	#else /* #ifndef uatomic_cmpxchg */
	285
	286	#ifndef uatomic_and
	287	/* uatomic_and */
	288
	289	static inline __attribute__((always_inline))
	290	void _uatomic_and(void *addr, unsigned long val, int len)
	291	{
	292	switch (len) {
	293	#ifdef UATOMIC_HAS_ATOMIC_BYTE
	294	case 1:
	295	{
	296	uint8_t old, oldt;
	297
	298	oldt = uatomic_read((uint8_t *) addr);
	299	do {
	300	old = oldt;
	301	oldt = _uatomic_cmpxchg(addr, old, old & val, 1);
	302	} while (oldt != old);
	303
	304	return;
	305	}
	306	#endif
	307	#ifdef UATOMIC_HAS_ATOMIC_SHORT
	308	case 2:
	309	{
	310	uint16_t old, oldt;
	311
	312	oldt = uatomic_read((uint16_t *) addr);
	313	do {
	314	old = oldt;
	315	oldt = _uatomic_cmpxchg(addr, old, old & val, 2);
	316	} while (oldt != old);
	317	}
	318	#endif
	319	case 4:
	320	{
	321	uint32_t old, oldt;
	322
	323	oldt = uatomic_read((uint32_t *) addr);
	324	do {
	325	old = oldt;
	326	oldt = _uatomic_cmpxchg(addr, old, old & val, 4);
	327	} while (oldt != old);
	328
	329	return;
	330	}
	331	#if (CAA_BITS_PER_LONG == 64)
	332	case 8:
	333	{
	334	uint64_t old, oldt;
	335
	336	oldt = uatomic_read((uint64_t *) addr);
	337	do {
	338	old = oldt;
	339	oldt = _uatomic_cmpxchg(addr, old, old & val, 8);
	340	} while (oldt != old);
	341
	342	return;
	343	}
	344	#endif
	345	}
	346	_uatomic_link_error();
	347	}
	348
	349	#define uatomic_and(addr, v) \
	350	(_uatomic_and((addr), \
	351	caa_cast_long_keep_sign(v), \
	352	sizeof(*(addr))))
	353	#define cmm_smp_mb__before_uatomic_and() cmm_barrier()
	354	#define cmm_smp_mb__after_uatomic_and() cmm_barrier()
	355
	356	#endif /* #ifndef uatomic_and */
	357
	358	#ifndef uatomic_or
	359	/* uatomic_or */
	360
	361	static inline __attribute__((always_inline))
	362	void _uatomic_or(void *addr, unsigned long val, int len)
	363	{
	364	switch (len) {
	365	#ifdef UATOMIC_HAS_ATOMIC_BYTE
	366	case 1:
	367	{
	368	uint8_t old, oldt;
	369
	370	oldt = uatomic_read((uint8_t *) addr);
	371	do {
	372	old = oldt;
	373	oldt = _uatomic_cmpxchg(addr, old, old \| val, 1);
	374	} while (oldt != old);
	375
	376	return;
	377	}
	378	#endif
	379	#ifdef UATOMIC_HAS_ATOMIC_SHORT
	380	case 2:
	381	{
	382	uint16_t old, oldt;
	383
	384	oldt = uatomic_read((uint16_t *) addr);
	385	do {
	386	old = oldt;
	387	oldt = _uatomic_cmpxchg(addr, old, old \| val, 2);
	388	} while (oldt != old);
	389
	390	return;
	391	}
	392	#endif
	393	case 4:
	394	{
	395	uint32_t old, oldt;
	396
	397	oldt = uatomic_read((uint32_t *) addr);
	398	do {
	399	old = oldt;
	400	oldt = _uatomic_cmpxchg(addr, old, old \| val, 4);
	401	} while (oldt != old);
	402
	403	return;
	404	}
	405	#if (CAA_BITS_PER_LONG == 64)
	406	case 8:
	407	{
	408	uint64_t old, oldt;
	409
	410	oldt = uatomic_read((uint64_t *) addr);
	411	do {
	412	old = oldt;
	413	oldt = _uatomic_cmpxchg(addr, old, old \| val, 8);
	414	} while (oldt != old);
	415
	416	return;
	417	}
	418	#endif
	419	}
	420	_uatomic_link_error();
	421	}
	422
	423	#define uatomic_or(addr, v) \
	424	(_uatomic_or((addr), \
	425	caa_cast_long_keep_sign(v), \
	426	sizeof(*(addr))))
	427	#define cmm_smp_mb__before_uatomic_or() cmm_barrier()
	428	#define cmm_smp_mb__after_uatomic_or() cmm_barrier()
	429
	430	#endif /* #ifndef uatomic_or */
	431
	432	#ifndef uatomic_add_return
	433	/* uatomic_add_return */
	434
	435	static inline __attribute__((always_inline))
	436	unsigned long _uatomic_add_return(void *addr, unsigned long val, int len)
	437	{
	438	switch (len) {
	439	#ifdef UATOMIC_HAS_ATOMIC_BYTE
	440	case 1:
	441	{
	442	uint8_t old, oldt;
	443
	444	oldt = uatomic_read((uint8_t *) addr);
	445	do {
	446	old = oldt;
	447	oldt = uatomic_cmpxchg((uint8_t *) addr,
	448	old, old + val);
	449	} while (oldt != old);
	450
	451	return old + val;
	452	}
	453	#endif
	454	#ifdef UATOMIC_HAS_ATOMIC_SHORT
	455	case 2:
	456	{
	457	uint16_t old, oldt;
	458
	459	oldt = uatomic_read((uint16_t *) addr);
	460	do {
	461	old = oldt;
	462	oldt = uatomic_cmpxchg((uint16_t *) addr,
	463	old, old + val);
	464	} while (oldt != old);
	465
	466	return old + val;
	467	}
	468	#endif
	469	case 4:
	470	{
	471	uint32_t old, oldt;
	472
	473	oldt = uatomic_read((uint32_t *) addr);
	474	do {
	475	old = oldt;
	476	oldt = uatomic_cmpxchg((uint32_t *) addr,
	477	old, old + val);
	478	} while (oldt != old);
	479
	480	return old + val;
	481	}
	482	#if (CAA_BITS_PER_LONG == 64)
	483	case 8:
	484	{
	485	uint64_t old, oldt;
	486
	487	oldt = uatomic_read((uint64_t *) addr);
	488	do {
	489	old = oldt;
	490	oldt = uatomic_cmpxchg((uint64_t *) addr,
	491	old, old + val);
	492	} while (oldt != old);
	493
	494	return old + val;
	495	}
	496	#endif
	497	}
	498	_uatomic_link_error();
	499	return 0;
	500	}
	501
	502	#define uatomic_add_return(addr, v) \
	503	((__typeof__(*(addr))) _uatomic_add_return((addr), \
	504	caa_cast_long_keep_sign(v), \
	505	sizeof(*(addr))))
	506	#endif /* #ifndef uatomic_add_return */
	507
	508	#ifndef uatomic_xchg
	509	/* xchg */
	510
	511	static inline __attribute__((always_inline))
	512	unsigned long _uatomic_exchange(void *addr, unsigned long val, int len)
	513	{
	514	switch (len) {
	515	#ifdef UATOMIC_HAS_ATOMIC_BYTE
	516	case 1:
	517	{
	518	uint8_t old, oldt;
	519
	520	oldt = uatomic_read((uint8_t *) addr);
	521	do {
	522	old = oldt;
	523	oldt = uatomic_cmpxchg((uint8_t *) addr,
	524	old, val);
	525	} while (oldt != old);
	526
	527	return old;
	528	}
	529	#endif
	530	#ifdef UATOMIC_HAS_ATOMIC_SHORT
	531	case 2:
	532	{
	533	uint16_t old, oldt;
	534
	535	oldt = uatomic_read((uint16_t *) addr);
	536	do {
	537	old = oldt;
	538	oldt = uatomic_cmpxchg((uint16_t *) addr,
	539	old, val);
	540	} while (oldt != old);
	541
	542	return old;
	543	}
	544	#endif
	545	case 4:
	546	{
	547	uint32_t old, oldt;
	548
	549	oldt = uatomic_read((uint32_t *) addr);
	550	do {
	551	old = oldt;
	552	oldt = uatomic_cmpxchg((uint32_t *) addr,
	553	old, val);
	554	} while (oldt != old);
	555
	556	return old;
	557	}
	558	#if (CAA_BITS_PER_LONG == 64)
	559	case 8:
	560	{
	561	uint64_t old, oldt;
	562
	563	oldt = uatomic_read((uint64_t *) addr);
	564	do {
	565	old = oldt;
	566	oldt = uatomic_cmpxchg((uint64_t *) addr,
	567	old, val);
	568	} while (oldt != old);
	569
	570	return old;
	571	}
	572	#endif
	573	}
	574	_uatomic_link_error();
	575	return 0;
	576	}
	577
	578	#define uatomic_xchg(addr, v) \
	579	((__typeof__(*(addr))) _uatomic_exchange((addr), \
	580	caa_cast_long_keep_sign(v), \
	581	sizeof(*(addr))))
	582	#endif /* #ifndef uatomic_xchg */
	583
	584	#endif /* #else #ifndef uatomic_cmpxchg */
	585
	586	/* uatomic_sub_return, uatomic_add, uatomic_sub, uatomic_inc, uatomic_dec */
	587
	588	#ifndef uatomic_add
	589	#define uatomic_add(addr, v) (void)uatomic_add_return((addr), (v))
	590	#define cmm_smp_mb__before_uatomic_add() cmm_barrier()
	591	#define cmm_smp_mb__after_uatomic_add() cmm_barrier()
	592	#endif
	593
	594	#define uatomic_sub_return(addr, v) \
	595	uatomic_add_return((addr), -(caa_cast_long_keep_sign(v)))
	596	#define uatomic_sub(addr, v) \
	597	uatomic_add((addr), -(caa_cast_long_keep_sign(v)))
	598	#define cmm_smp_mb__before_uatomic_sub() cmm_smp_mb__before_uatomic_add()
	599	#define cmm_smp_mb__after_uatomic_sub() cmm_smp_mb__after_uatomic_add()
	600
	601	#ifndef uatomic_inc
	602	#define uatomic_inc(addr) uatomic_add((addr), 1)
	603	#define cmm_smp_mb__before_uatomic_inc() cmm_smp_mb__before_uatomic_add()
	604	#define cmm_smp_mb__after_uatomic_inc() cmm_smp_mb__after_uatomic_add()
	605	#endif
	606
	607	#ifndef uatomic_dec
	608	#define uatomic_dec(addr) uatomic_add((addr), -1)
	609	#define cmm_smp_mb__before_uatomic_dec() cmm_smp_mb__before_uatomic_add()
	610	#define cmm_smp_mb__after_uatomic_dec() cmm_smp_mb__after_uatomic_add()
	611	#endif
	612
	613	#ifdef __cplusplus
	614	}
	615	#endif
	616
	617	#endif /* _URCU_UATOMIC_GENERIC_H */