[lttng-ust.git] / libust / buffer.h

/* Copyright (C) 2005-2009  Mathieu Desnoyers
 *
 * 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; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * 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
 */

#ifndef UST_BUFFER_H
#define UST_BUFFER_H

/* Buffer offset macros */

/*
 * BUFFER_TRUNC zeroes the subbuffer offset and the subbuffer number parts of
 * the offset, which leaves only the buffer number.
 */
#define BUFFER_TRUNC(offset, chan) \
	((offset) & (~((chan)->alloc_size-1)))
#define BUFFER_OFFSET(offset, chan) ((offset) & ((chan)->alloc_size - 1))
#define SUBBUF_OFFSET(offset, chan) ((offset) & ((chan)->subbuf_size - 1))
#define SUBBUF_ALIGN(offset, chan) \
	(((offset) + (chan)->subbuf_size) & (~((chan)->subbuf_size - 1)))
#define SUBBUF_TRUNC(offset, chan) \
	((offset) & (~((chan)->subbuf_size - 1)))
#define SUBBUF_INDEX(offset, chan) \
	(BUFFER_OFFSET((offset), chan) >> (chan)->subbuf_size_order)


#endif /* UST_BUFFER_H */
Commit	Line	Data
22cb38fb PMF	1	/* Copyright (C) 2005-2009 Mathieu Desnoyers
	2	*
	3	* This library is free software; you can redistribute it and/or
	4	* modify it under the terms of the GNU Lesser General Public
	5	* License as published by the Free Software Foundation; either
	6	* version 2.1 of the License, or (at your option) any later version.
	7	*
	8	* This library is distributed in the hope that it will be useful,
	9	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	10	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	11	* Lesser General Public License for more details.
	12	*
	13	* You should have received a copy of the GNU Lesser General Public
	14	* License along with this library; if not, write to the Free Software
	15	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	16	*/
	17
a6de7618 PMF	18	#ifndef UST_BUFFER_H
	19	#define UST_BUFFER_H
	20
	21	/* Buffer offset macros */
	22
	23	/*
	24	* BUFFER_TRUNC zeroes the subbuffer offset and the subbuffer number parts of
	25	* the offset, which leaves only the buffer number.
	26	*/
	27	#define BUFFER_TRUNC(offset, chan) \
	28	((offset) & (~((chan)->alloc_size-1)))
	29	#define BUFFER_OFFSET(offset, chan) ((offset) & ((chan)->alloc_size - 1))
	30	#define SUBBUF_OFFSET(offset, chan) ((offset) & ((chan)->subbuf_size - 1))
	31	#define SUBBUF_ALIGN(offset, chan) \
	32	(((offset) + (chan)->subbuf_size) & (~((chan)->subbuf_size - 1)))
	33	#define SUBBUF_TRUNC(offset, chan) \
	34	((offset) & (~((chan)->subbuf_size - 1)))
	35	#define SUBBUF_INDEX(offset, chan) \
	36	(BUFFER_OFFSET((offset), chan) >> (chan)->subbuf_size_order)
	37
	38
	39	#endif /* UST_BUFFER_H */