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Comparing libeio/eio.h (file contents):
Revision 1.10 by root, Tue May 13 18:54:52 2008 UTC vs.
Revision 1.12 by root, Sat May 17 12:17:25 2008 UTC

1/*
2 * libeio API header
3 *
4 * Copyright (c) 2007,2008 Marc Alexander Lehmann <libeio@schmorp.de>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without modifica-
8 * tion, are permitted provided that the following conditions are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright notice,
11 * this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
19 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
20 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
21 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
23 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
25 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
26 * OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Alternatively, the contents of this file may be used under the terms of
29 * the GNU General Public License ("GPL") version 2 or any later version,
30 * in which case the provisions of the GPL are applicable instead of
31 * the above. If you wish to allow the use of your version of this file
32 * only under the terms of the GPL and not to allow others to use your
33 * version of this file under the BSD license, indicate your decision
34 * by deleting the provisions above and replace them with the notice
35 * and other provisions required by the GPL. If you do not delete the
36 * provisions above, a recipient may use your version of this file under
37 * either the BSD or the GPL.
38 */
39
1#ifndef EIO_H_ 40#ifndef EIO_H_
2#define EIO_H_ 41#define EIO_H_
3 42
4#include <stddef.h> 43#include <stddef.h>
5#include <sys/types.h> 44#include <sys/types.h>
… …
15#ifndef EIO_STRUCT_STAT 54#ifndef EIO_STRUCT_STAT
16# define EIO_STRUCT_STAT struct stat 55# define EIO_STRUCT_STAT struct stat
17#endif 56#endif
18 57
19enum { 58enum {
20 EIO_QUIT,
21 EIO_OPEN, EIO_CLOSE, EIO_DUP2, 59 EIO_OPEN, EIO_CLOSE, EIO_DUP2,
22 EIO_READ, EIO_WRITE, 60 EIO_READ, EIO_WRITE,
23 EIO_READAHEAD, EIO_SENDFILE, 61 EIO_READAHEAD, EIO_SENDFILE,
24 EIO_STAT, EIO_LSTAT, EIO_FSTAT, 62 EIO_STAT, EIO_LSTAT, EIO_FSTAT,
25 EIO_TRUNCATE, EIO_FTRUNCATE, 63 EIO_TRUNCATE, EIO_FTRUNCATE,
… …
38 76
39/* eio request structure */ 77/* eio request structure */
40/* this structure is mostly read-only */ 78/* this structure is mostly read-only */
41struct eio_req 79struct eio_req
42{ 80{
43 eio_req volatile *next; /* private */ 81 eio_req volatile *next; /* private ETP */
44 82
45 ssize_t result; /* result of syscall, e.g. result = read (... */ 83 ssize_t result; /* result of syscall, e.g. result = read (... */
46 off_t offs; /* read, write, truncate, readahead: file offset; mknod: dev_t */ 84 off_t offs; /* read, write, truncate, readahead: file offset; mknod: dev_t */
47 size_t size; /* read, write, readahead, sendfile: length */ 85 size_t size; /* read, write, readahead, sendfile: length */
48 void *ptr1; /* all applicable requests: pathname, old name */ 86 void *ptr1; /* all applicable requests: pathname, old name */
49 void *ptr2; /* all applicable requests: new name or memory buffer */ 87 void *ptr2; /* all applicable requests: new name or memory buffer */
50 eio_tstamp nv1; /* utime, futime: atime; busy: sleep time */ 88 eio_tstamp nv1; /* utime, futime: atime; busy: sleep time */
51 eio_tstamp nv2; /* utime, futime: mtime */ 89 eio_tstamp nv2; /* utime, futime: mtime */
52 90
53 int type; /* EIO_xxx constant */ 91 int type; /* EIO_xxx constant ETP */
54 int int1; /* all applicable requests: file descriptor; sendfile: output fd; open: flags */ 92 int int1; /* all applicable requests: file descriptor; sendfile: output fd; open: flags */
55 long int2; /* chown, fchown: uid; sendfile: input fd; open, chmod, mkdir, mknod: file mode */ 93 long int2; /* chown, fchown: uid; sendfile: input fd; open, chmod, mkdir, mknod: file mode */
56 long int3; /* chown, fchown: gid */ 94 long int3; /* chown, fchown: gid */
57 int errorno; /* errno value on syscall return */ 95 int errorno; /* errno value on syscall return */
58 96
… …
78enum { 116enum {
79 EIO_PRI_MIN = -4, 117 EIO_PRI_MIN = -4,
80 EIO_PRI_MAX = 4, 118 EIO_PRI_MAX = 4,
81 119
82 EIO_PRI_DEFAULT = 0, 120 EIO_PRI_DEFAULT = 0,
83 EIO_PRI_BIAS = -EIO_PRI_MIN,
84 EIO_NUM_PRI = EIO_PRI_MAX + EIO_PRI_BIAS + 1
85}; 121};
86 122
87/* returns < 0 on error, errno set 123/* returns < 0 on error, errno set
88 * need_poll, if non-zero, will be called when results are available 124 * need_poll, if non-zero, will be called when results are available
89 * and eio_poll_cb needs to be invoked (it MUST NOT call eio_poll_cb itself). 125 * and eio_poll_cb needs to be invoked (it MUST NOT call eio_poll_cb itself).
… …
111unsigned int eio_nready (void); /* number of not-yet handled requests */ 147unsigned int eio_nready (void); /* number of not-yet handled requests */
112unsigned int eio_npending (void); /* numbe rof finished but unhandled requests */ 148unsigned int eio_npending (void); /* numbe rof finished but unhandled requests */
113unsigned int eio_nthreads (void); /* number of worker threads in use currently */ 149unsigned int eio_nthreads (void); /* number of worker threads in use currently */
114 150
115/*****************************************************************************/ 151/*****************************************************************************/
116/* high-level request API */ 152/* convinience wrappers */
117 153
118#ifndef EIO_NO_WRAPPERS 154#ifndef EIO_NO_WRAPPERS
119eio_req *eio_nop (int pri, eio_cb cb, void *data); /* does nothing except go through the whole process */ 155eio_req *eio_nop (int pri, eio_cb cb, void *data); /* does nothing except go through the whole process */
120eio_req *eio_busy (eio_tstamp delay, int pri, eio_cb cb, void *data); /* ties a thread for this long, simulating busyness */ 156eio_req *eio_busy (eio_tstamp delay, int pri, eio_cb cb, void *data); /* ties a thread for this long, simulating busyness */
121eio_req *eio_sync (int pri, eio_cb cb, void *data); 157eio_req *eio_sync (int pri, eio_cb cb, void *data);
… …
148eio_req *eio_link (const char *path, const char *new_path, int pri, eio_cb cb, void *data); 184eio_req *eio_link (const char *path, const char *new_path, int pri, eio_cb cb, void *data);
149eio_req *eio_symlink (const char *path, const char *new_path, int pri, eio_cb cb, void *data); 185eio_req *eio_symlink (const char *path, const char *new_path, int pri, eio_cb cb, void *data);
150eio_req *eio_rename (const char *path, const char *new_path, int pri, eio_cb cb, void *data); 186eio_req *eio_rename (const char *path, const char *new_path, int pri, eio_cb cb, void *data);
151#endif 187#endif
152 188
189/*****************************************************************************/
153/* for groups */ 190/* groups */
191
154eio_req *eio_grp (eio_cb cb, void *data); 192eio_req *eio_grp (eio_cb cb, void *data);
155void eio_grp_feed (eio_req *grp, void (*feed)(eio_req *req), int limit); 193void eio_grp_feed (eio_req *grp, void (*feed)(eio_req *req), int limit);
156void eio_grp_limit (eio_req *grp, int limit); 194void eio_grp_limit (eio_req *grp, int limit);
157void eio_grp_add (eio_req *grp, eio_req *req); 195void eio_grp_add (eio_req *grp, eio_req *req);
158void eio_grp_cancel (eio_req *grp); /* cancels all sub requests but not the group */ 196void eio_grp_cancel (eio_req *grp); /* cancels all sub requests but not the group */
159 197
160/* cancel a request as soon fast as possible */ 198/*****************************************************************************/
161void eio_cancel (eio_req *req); 199/* request api */
162/* destroy a request that has never been submitted */
163void eio_destroy (eio_req *req);
164 200
165/* true if the request was cancelled, useful in the invoke callback */ 201/* true if the request was cancelled, useful in the invoke callback */
166#define EIO_CANCELLED(req) ((req)->flags & EIO_FLAG_CANCELLED) 202#define EIO_CANCELLED(req) ((req)->flags & EIO_FLAG_CANCELLED)
167 203
168#define EIO_RESULT(req) ((req)->result) 204#define EIO_RESULT(req) ((req)->result)
169/* returns a pointer to the result buffer allocated by eio */ 205/* returns a pointer to the result buffer allocated by eio */
170#define EIO_BUF(req) ((req)->ptr2) 206#define EIO_BUF(req) ((req)->ptr2)
171#define EIO_STAT_BUF(req) ((EIO_STRUCT_STAT *)EIO_BUF(req)) 207#define EIO_STAT_BUF(req) ((EIO_STRUCT_STAT *)EIO_BUF(req))
172#define EIO_PATH(req) ((char *)(req)->ptr1) 208#define EIO_PATH(req) ((char *)(req)->ptr1)
173 209
174/*****************************************************************************/
175/* low-level request API */
176
177/* must be used to initialise eio_req's */
178#define EIO_INIT(req,prio,finish_cb, destroy_cb) \
179 memset ((req), 0, sizeof (eio_req)); \
180 (req)->pri = (prio) + EIO_PRI_BIAS; \
181 (req)->finish = (finish_cb); \
182 (req)->destroy = (destroy_cb)
183
184/* submit a request for execution */ 210/* submit a request for execution */
185void eio_submit (eio_req *req); 211void eio_submit (eio_req *req);
212/* cancel a request as soon fast as possible, if possible */
213void eio_cancel (eio_req *req);
214/* destroy a request that has never been submitted */
215void eio_destroy (eio_req *req);
186 216
187/*****************************************************************************/ 217/*****************************************************************************/
188/* convinience functions */ 218/* convinience functions */
189 219
190ssize_t eio_sendfile_sync (int ofd, int ifd, off_t offset, size_t count); 220ssize_t eio_sendfile_sync (int ofd, int ifd, off_t offset, size_t count);

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