[userspace-rcu.git] / include / urcu / system.h

// SPDX-FileCopyrightText: 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
//
// SPDX-License-Identifier: MIT

#ifndef _URCU_SYSTEM_H
#define _URCU_SYSTEM_H

/*
 * System definitions.
 */

#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)			\
	__extension__			\
	({				\
		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)	__extension__ ({ 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)						\
	__extension__							\
	({								\
		__typeof__(x) _v = _CMM_STORE_SHARED(x, v);		\
		cmm_smp_wmc();						\
		_v = _v;	/* Work around clang "unused result" */	\
	})

#endif /* _URCU_SYSTEM_H */
Commit	Line	Data
	1	// SPDX-FileCopyrightText: 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
	2	//
	3	// SPDX-License-Identifier: MIT
	4
	5	#ifndef _URCU_SYSTEM_H
	6	#define _URCU_SYSTEM_H
	7
	8	/*
	9	* System definitions.
	10	*/
	11
	12	#include <urcu/compiler.h>
	13	#include <urcu/arch.h>
	14
	15	/*
	16	* Identify a shared load. A cmm_smp_rmc() or cmm_smp_mc() should come
	17	* before the load.
	18	*/
	19	#define _CMM_LOAD_SHARED(p) CMM_ACCESS_ONCE(p)
	20
	21	/*
	22	* Load a data from shared memory, doing a cache flush if required.
	23	*/
	24	#define CMM_LOAD_SHARED(p) \
	25	__extension__ \
	26	({ \
	27	cmm_smp_rmc(); \
	28	_CMM_LOAD_SHARED(p); \
	29	})
	30
	31	/*
	32	* Identify a shared store. A cmm_smp_wmc() or cmm_smp_mc() should
	33	* follow the store.
	34	*/
	35	#define _CMM_STORE_SHARED(x, v) __extension__ ({ CMM_ACCESS_ONCE(x) = (v); })
	36
	37	/*
	38	* Store v into x, where x is located in shared memory. Performs the
	39	* required cache flush after writing. Returns v.
	40	*/
	41	#define CMM_STORE_SHARED(x, v) \
	42	__extension__ \
	43	({ \
	44	__typeof__(x) _v = _CMM_STORE_SHARED(x, v); \
	45	cmm_smp_wmc(); \
	46	_v = _v; /* Work around clang "unused result" */ \
	47	})
	48
	49	#endif /* _URCU_SYSTEM_H */