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Comparing libeio/eio.h (file contents):
Revision 1.5 by root, Sun May 11 19:11:05 2008 UTC vs.
Revision 1.15 by root, Tue Jun 17 23:58:48 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
43#ifdef __cplusplus
44extern "C" {
45#endif
46
4#include <stddef.h> 47#include <stddef.h>
5#include <sys/types.h> 48#include <sys/types.h>
6 49
7typedef struct eio_req eio_req; 50typedef struct eio_req eio_req;
8 51
9typedef int (*eio_cb)(eio_req *req); 52typedef int (*eio_cb)(eio_req *req);
10 53
11#ifndef EIO_COMMON 54#ifndef EIO_REQ_MEMBERS
12# define EIO_COMMON void *data 55# define EIO_REQ_MEMBERS
56#endif
57
58#ifndef EIO_STRUCT_STAT
59# define EIO_STRUCT_STAT struct stat
13#endif 60#endif
14 61
15enum { 62enum {
16 EIO_QUIT,
17 EIO_OPEN, EIO_CLOSE, EIO_DUP2, 63 EIO_OPEN, EIO_CLOSE, EIO_DUP2,
18 EIO_READ, EIO_WRITE, 64 EIO_READ, EIO_WRITE,
19 EIO_READAHEAD, EIO_SENDFILE, 65 EIO_READAHEAD, EIO_SENDFILE,
20 EIO_STAT, EIO_LSTAT, EIO_FSTAT, 66 EIO_STAT, EIO_LSTAT, EIO_FSTAT,
21 EIO_TRUNCATE, EIO_FTRUNCATE, 67 EIO_TRUNCATE, EIO_FTRUNCATE,
… …
25 EIO_SYNC, EIO_FSYNC, EIO_FDATASYNC, 71 EIO_SYNC, EIO_FSYNC, EIO_FDATASYNC,
26 EIO_UNLINK, EIO_RMDIR, EIO_MKDIR, EIO_RENAME, 72 EIO_UNLINK, EIO_RMDIR, EIO_MKDIR, EIO_RENAME,
27 EIO_MKNOD, EIO_READDIR, 73 EIO_MKNOD, EIO_READDIR,
28 EIO_LINK, EIO_SYMLINK, EIO_READLINK, 74 EIO_LINK, EIO_SYMLINK, EIO_READLINK,
29 EIO_GROUP, EIO_NOP, 75 EIO_GROUP, EIO_NOP,
30 EIO_BUSY, 76 EIO_BUSY, EIO_CUSTOM
31}; 77};
32 78
33typedef double eio_tstamp; /* feel free to use double in your code directly */ 79typedef double eio_tstamp; /* feel free to use double in your code directly */
34 80
35/* eio request structure */ 81/* eio request structure */
36/* this structure is mostly read-only */ 82/* this structure is mostly read-only */
37struct eio_req 83struct eio_req
38{ 84{
39 eio_req volatile *next; /* private */ 85 eio_req volatile *next; /* private ETP */
40 86
41 ssize_t result; /* result of syscall, e.g. result = read (... */ 87 ssize_t result; /* result of syscall, e.g. result = read (... */
42 off_t offs; /* read, write, truncate, readahead: file offset; mknod: dev_t */ 88 off_t offs; /* read, write, truncate, readahead: file offset */
43 size_t size; /* read, write, readahead, sendfile: length */ 89 size_t size; /* read, write, readahead, sendfile: length */
44 void *ptr1; /* all applicable requests: pathname, old name */ 90 void *ptr1; /* all applicable requests: pathname, old name */
45 void *ptr2; /* all applicable requests: new name or memory buffer */ 91 void *ptr2; /* all applicable requests: new name or memory buffer */
46 eio_tstamp nv1; /* utime, futime: atime; busy: sleep time */ 92 eio_tstamp nv1; /* utime, futime: atime; busy: sleep time */
47 eio_tstamp nv2; /* utime, futime: mtime */ 93 eio_tstamp nv2; /* utime, futime: mtime */
48 94
49 int type; /* EIO_xxx constant */ 95 int type; /* EIO_xxx constant ETP */
50 int int1; /* all applicable requests: file descriptor; sendfile: output fd; open: flags */ 96 int int1; /* all applicable requests: file descriptor; sendfile: output fd; open: flags */
51 long int2; /* chown, fchown: uid; sendfile: input fd; open, chmod, mkdir, mknod: file mode */ 97 long int2; /* chown, fchown: uid; sendfile: input fd; open, chmod, mkdir, mknod: file mode */
52 long int3; /* chown, fchown: gid */ 98 long int3; /* chown, fchown: gid; mknod: dev_t */
53 int errorno; /* errno value on syscall return */ 99 int errorno; /* errno value on syscall return */
54 100
55 unsigned char flags; /* private */ 101 unsigned char flags; /* private */
56 unsigned char pri; /* the priority */ 102 signed char pri; /* the priority */
57 103
104 void *data;
58 eio_cb finish; 105 eio_cb finish;
59 void (*destroy)(eio_req *req); 106 void (*destroy)(eio_req *req); /* called when requets no longer needed */
60 void (*feed)(eio_req *req); 107 void (*feed)(eio_req *req); /* only used for group requests */
61 108
62 EIO_COMMON; 109 EIO_REQ_MEMBERS
63 110
64 eio_req *grp, *grp_prev, *grp_next, *grp_first; /* private */ 111 eio_req *grp, *grp_prev, *grp_next, *grp_first; /* private */
65}; 112};
66 113
67enum { 114enum {
… …
71}; 118};
72 119
73enum { 120enum {
74 EIO_PRI_MIN = -4, 121 EIO_PRI_MIN = -4,
75 EIO_PRI_MAX = 4, 122 EIO_PRI_MAX = 4,
76
77 EIO_DEFAULT_PRI = 0, 123 EIO_PRI_DEFAULT = 0,
78 EIO_PRI_BIAS = -EIO_PRI_MIN,
79 EIO_NUM_PRI = EIO_PRI_MAX + EIO_PRI_BIAS + 1
80}; 124};
81 125
82/* returns < 0 on error, errno set 126/* returns < 0 on error, errno set
83 * need_poll, if non-zero, will be called when results are available 127 * need_poll, if non-zero, will be called when results are available
84 * and eio_poll_cb needs to be invoked (it MUST NOT call eio_poll_cb itself). 128 * and eio_poll_cb needs to be invoked (it MUST NOT call eio_poll_cb itself).
… …
106unsigned int eio_nready (void); /* number of not-yet handled requests */ 150unsigned int eio_nready (void); /* number of not-yet handled requests */
107unsigned int eio_npending (void); /* numbe rof finished but unhandled requests */ 151unsigned int eio_npending (void); /* numbe rof finished but unhandled requests */
108unsigned int eio_nthreads (void); /* number of worker threads in use currently */ 152unsigned int eio_nthreads (void); /* number of worker threads in use currently */
109 153
110/*****************************************************************************/ 154/*****************************************************************************/
111/* high-level request API */ 155/* convinience wrappers */
112 156
113eio_req *eio_fsync (int fd, eio_cb cb); 157#ifndef EIO_NO_WRAPPERS
114eio_req *eio_fdatasync (int fd, eio_cb cb); 158eio_req *eio_nop (int pri, eio_cb cb, void *data); /* does nothing except go through the whole process */
115eio_req *eio_readahead (int fd, off_t offset, size_t length, eio_cb cb);
116eio_req *eio_read (int fd, off_t offset, size_t length, void *data, eio_cb cb);
117eio_req *eio_write (int fd, off_t offset, size_t length, void *data, eio_cb cb);
118eio_req *eio_fstat (int fd, eio_cb cb); /* stat buffer=ptr2 allocated dynamically */
119eio_req *eio_futime (int fd, eio_tstamp atime, eio_tstamp mtime, eio_cb cb);
120eio_req *eio_ftruncate (int fd, off_t offset, eio_cb cb);
121eio_req *eio_fchmod (int fd, mode_t mode, eio_cb cb);
122eio_req *eio_fchown (int fd, uid_t uid, gid_t gid, eio_cb cb);
123eio_req *eio_dup2 (int fd, int fd2, eio_cb cb);
124eio_req *eio_sendfile (int out_fd, int in_fd, off_t in_offset, size_t length, eio_cb cb);
125eio_req *eio_open (const char *path, int flags, mode_t mode, eio_cb cb);
126eio_req *eio_readlink (const char *path, eio_cb cb); /* result=ptr2 allocated dynamically */
127eio_req *eio_stat (const char *path, eio_cb cb); /* stat buffer=ptr2 allocated dynamically */
128eio_req *eio_lstat (const char *path, eio_cb cb); /* stat buffer=ptr2 allocated dynamically */
129eio_req *eio_utime (const char *path, eio_tstamp atime, eio_tstamp mtime, eio_cb cb);
130eio_req *eio_truncate (const char *path, off_t offset, eio_cb cb);
131eio_req *eio_chown (const char *path, uid_t uid, gid_t gid, eio_cb cb);
132eio_req *eio_chmod (const char *path, mode_t mode, eio_cb cb);
133eio_req *eio_mkdir (const char *path, mode_t mode, eio_cb cb);
134eio_req *eio_unlink (const char *path, eio_cb cb);
135eio_req *eio_rmdir (const char *path, eio_cb cb);
136eio_req *eio_readdir (const char *path, eio_cb cb); /* result=ptr2 allocated dynamically */
137eio_req *eio_mknod (const char *path, mode_t mode, dev_t dev, eio_cb cb);
138eio_req *eio_busy (eio_tstamp delay, eio_cb cb); /* ties a thread for this long, simulating busyness */ 159eio_req *eio_busy (eio_tstamp delay, int pri, eio_cb cb, void *data); /* ties a thread for this long, simulating busyness */
139eio_req *eio_nop (eio_cb cb); /* does nothing except go through the whole process */ 160eio_req *eio_sync (int pri, eio_cb cb, void *data);
161eio_req *eio_fsync (int fd, int pri, eio_cb cb, void *data);
162eio_req *eio_fdatasync (int fd, int pri, eio_cb cb, void *data);
163eio_req *eio_close (int fd, int pri, eio_cb cb, void *data);
164eio_req *eio_readahead (int fd, off_t offset, size_t length, int pri, eio_cb cb, void *data);
165eio_req *eio_read (int fd, void *buf, size_t length, off_t offset, int pri, eio_cb cb, void *data);
166eio_req *eio_write (int fd, void *buf, size_t length, off_t offset, int pri, eio_cb cb, void *data);
167eio_req *eio_fstat (int fd, int pri, eio_cb cb, void *data); /* stat buffer=ptr2 allocated dynamically */
168eio_req *eio_futime (int fd, eio_tstamp atime, eio_tstamp mtime, int pri, eio_cb cb, void *data);
169eio_req *eio_ftruncate (int fd, off_t offset, int pri, eio_cb cb, void *data);
170eio_req *eio_fchmod (int fd, mode_t mode, int pri, eio_cb cb, void *data);
171eio_req *eio_fchown (int fd, uid_t uid, gid_t gid, int pri, eio_cb cb, void *data);
172eio_req *eio_dup2 (int fd, int fd2, int pri, eio_cb cb, void *data);
173eio_req *eio_sendfile (int out_fd, int in_fd, off_t in_offset, size_t length, int pri, eio_cb cb, void *data);
174eio_req *eio_open (const char *path, int flags, mode_t mode, int pri, eio_cb cb, void *data);
175eio_req *eio_utime (const char *path, eio_tstamp atime, eio_tstamp mtime, int pri, eio_cb cb, void *data);
176eio_req *eio_truncate (const char *path, off_t offset, int pri, eio_cb cb, void *data);
177eio_req *eio_chown (const char *path, uid_t uid, gid_t gid, int pri, eio_cb cb, void *data);
178eio_req *eio_chmod (const char *path, mode_t mode, int pri, eio_cb cb, void *data);
179eio_req *eio_mkdir (const char *path, mode_t mode, int pri, eio_cb cb, void *data);
180eio_req *eio_readdir (const char *path, int pri, eio_cb cb, void *data); /* result=ptr2 allocated dynamically */
181eio_req *eio_rmdir (const char *path, int pri, eio_cb cb, void *data);
182eio_req *eio_unlink (const char *path, int pri, eio_cb cb, void *data);
183eio_req *eio_readlink (const char *path, int pri, eio_cb cb, void *data); /* result=ptr2 allocated dynamically */
184eio_req *eio_stat (const char *path, int pri, eio_cb cb, void *data); /* stat buffer=ptr2 allocated dynamically */
185eio_req *eio_lstat (const char *path, int pri, eio_cb cb, void *data); /* stat buffer=ptr2 allocated dynamically */
186eio_req *eio_mknod (const char *path, mode_t mode, dev_t dev, int pri, eio_cb cb, void *data);
187eio_req *eio_link (const char *path, const char *new_path, int pri, eio_cb cb, void *data);
188eio_req *eio_symlink (const char *path, const char *new_path, int pri, eio_cb cb, void *data);
189eio_req *eio_rename (const char *path, const char *new_path, int pri, eio_cb cb, void *data);
190eio_req *eio_custom (eio_cb execute, int pri, eio_cb cb, void *data);
191#endif
140 192
193/*****************************************************************************/
141/* for groups */ 194/* groups */
195
142eio_req *eio_grp (eio_cb cb); 196eio_req *eio_grp (eio_cb cb, void *data);
143void eio_grp_feed (eio_req *grp, void (*feed)(eio_req *req), int limit); 197void eio_grp_feed (eio_req *grp, void (*feed)(eio_req *req), int limit);
144void eio_grp_limit (eio_req *grp, int limit); 198void eio_grp_limit (eio_req *grp, int limit);
145void eio_grp_add (eio_req *grp, eio_req *req); 199void eio_grp_add (eio_req *grp, eio_req *req);
146void eio_grp_cancel (eio_req *grp); /* cancels all sub requests but not the group */ 200void eio_grp_cancel (eio_req *grp); /* cancels all sub requests but not the group */
147 201
148/*****************************************************************************/ 202/*****************************************************************************/
149/* low-level request API */ 203/* request api */
150
151/* must be used to initialise eio_req's */
152#define EIO_INIT(req,prio,finish_cb, destroy_cb) \
153 memset ((req), 0, sizeof (eio_req)); \
154 (req)->pri = (prio) + EIO_PRI_BIAS; \
155 (req)->finish = (finish_cb); \
156 (req)->destroy = (destroy_cb)
157 204
158/* true if the request was cancelled, useful in the invoke callback */ 205/* true if the request was cancelled, useful in the invoke callback */
159#define EIO_CANCELLED(req) ((req)->flags & EIO_FLAG_CANCELLED) 206#define EIO_CANCELLED(req) ((req)->flags & EIO_FLAG_CANCELLED)
160 207
208#define EIO_RESULT(req) ((req)->result)
209/* returns a pointer to the result buffer allocated by eio */
210#define EIO_BUF(req) ((req)->ptr2)
211#define EIO_STAT_BUF(req) ((EIO_STRUCT_STAT *)EIO_BUF(req))
212#define EIO_PATH(req) ((char *)(req)->ptr1)
213
161/* submit a request for execution */ 214/* submit a request for execution */
162void eio_submit (eio_req *req); 215void eio_submit (eio_req *req);
163/* cancel a request as soon fast as possible */ 216/* cancel a request as soon fast as possible, if possible */
164void eio_cancel (eio_req *req); 217void eio_cancel (eio_req *req);
165/* destroy a request that has never been submitted */ 218/* destroy a request that has never been submitted */
166void eio_destroy (eio_req *req); 219void eio_destroy (eio_req *req);
167 220
168/*****************************************************************************/ 221/*****************************************************************************/
169/* convinience functions */ 222/* convinience functions */
170 223
171/*ssize_t eio_sendfile (int ofd, int ifd, off_t offset, size_t count)*/ 224ssize_t eio_sendfile_sync (int ofd, int ifd, off_t offset, size_t count);
172 225
226#ifdef __cplusplus
227}
173#endif 228#endif
174 229
230#endif
231

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