[lttng-ust.git] / libringbuffer / shm_internal.h

#ifndef _LIBRINGBUFFER_SHM_INTERNAL_H
#define _LIBRINGBUFFER_SHM_INTERNAL_H

/*
 * libringbuffer/shm_internal.h
 *
 * Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 *
 * This 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; only
 * version 2.1 of the License.
 *
 * This 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 this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

struct shm_ref {
	volatile ssize_t index;		/* within the object table */
	volatile ssize_t offset;	/* within the object */
};

#define DECLARE_SHMP(type, name)	\
	union {				\
		struct shm_ref _ref;	\
		type *_type;		\
	} name

#endif /* _LIBRINGBUFFER_SHM_INTERNAL_H */
Commit	Line	Data
1d498196 MD	1	#ifndef _LIBRINGBUFFER_SHM_INTERNAL_H
	2	#define _LIBRINGBUFFER_SHM_INTERNAL_H
	3
	4	/*
	5	* libringbuffer/shm_internal.h
	6	*
e92f3e28	7	* Copyright (C) 2011-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
1d498196	8	*
e92f3e28 MD	9	* This library is free software; you can redistribute it and/or
	10	* modify it under the terms of the GNU Lesser General Public
	11	* License as published by the Free Software Foundation; only
	12	* version 2.1 of the License.
	13	*
	14	* This library is distributed in the hope that it will be useful,
	15	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	17	* Lesser General Public License for more details.
	18	*
	19	* You should have received a copy of the GNU Lesser General Public
	20	* License along with this library; if not, write to the Free Software
	21	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
1d498196 MD	22	*/
	23
	24	struct shm_ref {
	25	volatile ssize_t index; /* within the object table */
	26	volatile ssize_t offset; /* within the object */
	27	};
	28
	29	#define DECLARE_SHMP(type, name) \
	30	union { \
	31	struct shm_ref _ref; \
	32	type *_type; \
	33	} name
	34
	35	#endif /* _LIBRINGBUFFER_SHM_INTERNAL_H */