File: [local] / prex / include / sys / buf.h (download)
Revision 1.1.1.1 (vendor branch), Tue Aug 19 12:46:56 2008 UTC (16 years ago) by nbrk
Branch: MAIN, KOHSUKE
CVS Tags: PREX_0_8_BASE, HEAD Changes since 1.1: +0 -0 lines
Initial import of Prex, Portable Real-time Embedded POSIX microkernel system.
I have totally new directions in my development (more focused on real hardware, not virtual one).
Old hacks are available in prex-old module. They will be carefully re-designed and merged soon.
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/*-
* Copyright (c) 2005-2007, Kohsuke Ohtani
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the author nor the names of any co-contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef _SYS_BUF_H
#define _SYS_BUF_H
#include <sys/types.h>
#include <sys/cdefs.h>
#include <sys/list.h>
/*
* Buffer header
*/
struct buf {
struct list b_link; /* link to block list */
int b_flags; /* see defines below */
dev_t b_dev; /* device number */
int b_blkno; /* block # on device */
mutex_t b_lock; /* lock for access */
char *b_data; /* pointer to data buffer */
};
/*
* These flags are kept in b_flags.
*/
#define B_BUSY 0x00000001 /* I/O in progress. */
#define B_DELWRI 0x00000002 /* delay I/O until buffer reused. */
#define B_INVAL 0x00000004 /* does not contain valid info. */
#define B_READ 0x00000008 /* read buffer. */
#define B_DONE 0x00000010 /* I/O completed. */
__BEGIN_DECLS
struct buf *getblk(dev_t dev, int blkno);
int bread(dev_t dev, int blkno, struct buf **bpp);
int bwrite(struct buf *bp);
void bdwrite(struct buf *bp);
void binval(dev_t dev);
void brelse(struct buf *);
void bflush(struct buf *);
void bio_sync(void);
void bio_init(void);
__END_DECLS
#endif /* !_SYS_BUF_H */