[urcu.git] / urcu / system.h

#ifndef _URCU_SYSTEM_H
#define _URCU_SYSTEM_H

/*
 * system.h
 *
 * System definitions.
 *
 * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 *
 * 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.
 */

#include <urcu/compiler.h>
#include <urcu/arch.h>

/*
 * Identify a shared load. A cmm_smp_rmc() or cmm_smp_mc() should come before the load.
 */
#define _CMM_LOAD_SHARED(p)	       CMM_ACCESS_ONCE(p)

/*
 * Load a data from shared memory, doing a cache flush if required.
 */
#define CMM_LOAD_SHARED(p)			\
	({				\
		cmm_smp_rmc();		\
		_CMM_LOAD_SHARED(p);	\
	})

/*
 * Identify a shared store. A cmm_smp_wmc() or cmm_smp_mc() should follow the store.
 */
#define _CMM_STORE_SHARED(x, v)	({ CMM_ACCESS_ONCE(x) = (v); })

/*
 * Store v into x, where x is located in shared memory. Performs the required
 * cache flush after writing. Returns v.
 */
#define CMM_STORE_SHARED(x, v)		\
	({				\
		typeof(x) _v = _CMM_STORE_SHARED(x, v);	\
		cmm_smp_wmc();		\
		_v;			\
	})

#endif /* _URCU_SYSTEM_H */
Commit	Line	Data
7e30abe3 MD	1	#ifndef _URCU_SYSTEM_H
	2	#define _URCU_SYSTEM_H
	3
	4	/*
	5	* system.h
	6	*
	7	* System definitions.
	8	*
6982d6d7	9	* Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
7e30abe3 MD	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
	21	#include <urcu/compiler.h>
	22	#include <urcu/arch.h>
	23
	24	/*
5481ddb3	25	* Identify a shared load. A cmm_smp_rmc() or cmm_smp_mc() should come before the load.
7e30abe3	26	*/
f5ee48a3	27	#define _CMM_LOAD_SHARED(p) CMM_ACCESS_ONCE(p)
7e30abe3 MD	28
	29	/*
	30	* Load a data from shared memory, doing a cache flush if required.
	31	*/
6cf3827c	32	#define CMM_LOAD_SHARED(p) \
7e30abe3	33	({ \
5481ddb3	34	cmm_smp_rmc(); \
6cf3827c	35	_CMM_LOAD_SHARED(p); \
7e30abe3 MD	36	})
	37
	38	/*
5481ddb3	39	* Identify a shared store. A cmm_smp_wmc() or cmm_smp_mc() should follow the store.
7e30abe3	40	*/
f5ee48a3	41	#define _CMM_STORE_SHARED(x, v) ({ CMM_ACCESS_ONCE(x) = (v); })
7e30abe3 MD	42
	43	/*
	44	* Store v into x, where x is located in shared memory. Performs the required
	45	* cache flush after writing. Returns v.
	46	*/
6cf3827c	47	#define CMM_STORE_SHARED(x, v) \
7e30abe3	48	({ \
6cf3827c	49	typeof(x) _v = _CMM_STORE_SHARED(x, v); \
5481ddb3	50	cmm_smp_wmc(); \
f152776d	51	_v; \
7e30abe3 MD	52	})
	53
	54	#endif /* _URCU_SYSTEM_H */