UbixOS V2 2.0

pipe_fs.h
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1 /*-
2 * Copyright (c) 2002-2018 The UbixOS Project.
3 * All rights reserved.
4 *
5 * This was developed by Christopher W. Olsen for the UbixOS Project.
6 *
7 * Redistribution and use in source and binary forms, with or without modification, are permitted
8 * provided that the following conditions are met:
9 *
10 * 1) Redistributions of source code must retain the above copyright notice, this list of
11 * conditions, the following disclaimer and the list of authors.
12 * 2) Redistributions in binary form must reproduce the above copyright notice, this list of
13 * conditions, the following disclaimer and the list of authors in the documentation and/or
14 * other materials provided with the distribution.
15 * 3) Neither the name of the UbixOS Project nor the names of its contributors may be used to
16 * endorse or promote products derived from this software without specific prior written
17 * permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
20 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
21 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
22 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
23 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
24 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
25 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
26 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29 #ifndef _FS_PIPE_FS_H
30 #define _FS_PIPE_FS_H
31
32 struct pipe_inode_info {
33 struct wait_queue *wait;
34 char *base;
35 unsigned int start;
36 unsigned int len;
37 unsigned int lock;
38 unsigned int rd_openers;
39 unsigned int wr_openers;
40 unsigned int readers;
41 unsigned int writers;
42 };
43
44 #define PIPE_WAIT(inode) ((inode).u.pipe_i.wait)
45 #define PIPE_BASE(inode) ((inode).u.pipe_i.base)
46 #define PIPE_START(inode) ((inode).u.pipe_i.start)
47 #define PIPE_LEN(inode) ((inode).u.pipe_i.len)
48 #define PIPE_RD_OPENERS(inode) ((inode).u.pipe_i.rd_openers)
49 #define PIPE_WR_OPENERS(inode) ((inode).u.pipe_i.wr_openers)
50 #define PIPE_READERS(inode) ((inode).u.pipe_i.readers)
51 #define PIPE_WRITERS(inode) ((inode).u.pipe_i.writers)
52 #define PIPE_LOCK(inode) ((inode).u.pipe_i.lock)
53 #define PIPE_SIZE(inode) PIPE_LEN(inode)
54
55 #define PIPE_EMPTY(inode) (PIPE_SIZE(inode)==0)
56 #define PIPE_FULL(inode) (PIPE_SIZE(inode)==PIPE_BUF)
57 #define PIPE_FREE(inode) (PIPE_BUF - PIPE_LEN(inode))
58 #define PIPE_END(inode) ((PIPE_START(inode)+PIPE_LEN(inode))&\
59 (PIPE_BUF-1))
60 #define PIPE_MAX_RCHUNK(inode) (PIPE_BUF - PIPE_START(inode))
61 #define PIPE_MAX_WCHUNK(inode) (PIPE_BUF - PIPE_END(inode))
62
63 #endif
pipe_inode_info::readers
unsigned int readers
Definition: pipe_fs.h:40
pipe_inode_info::start
unsigned int start
Definition: pipe_fs.h:35
pipe_inode_info::len
unsigned int len
Definition: pipe_fs.h:36
pipe_inode_info::rd_openers
unsigned int rd_openers
Definition: pipe_fs.h:38
pipe_inode_info::wr_openers
unsigned int wr_openers
Definition: pipe_fs.h:39
pipe_inode_info
Definition: pipe_fs.h:32
pipe_inode_info::wait
struct wait_queue * wait
Definition: pipe_fs.h:33
wait_queue
Definition: wait.h:34
pipe_inode_info::writers
unsigned int writers
Definition: pipe_fs.h:41
pipe_inode_info::base
char * base
Definition: pipe_fs.h:34
pipe_inode_info::lock
unsigned int lock
Definition: pipe_fs.h:37