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Comparing libeio/eio.h (file contents):
Revision 1.3 by root, Sun May 11 00:06:25 2008 UTC vs.
Revision 1.18 by root, Wed Oct 22 18:15:36 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 \ 55# define EIO_REQ_MEMBERS
13 eio_cb finish; \
14 void (*destroy)(eio_req *req);\
15 void *data
16#endif 56#endif
17 57
58#ifndef EIO_STRUCT_STAT
59# define EIO_STRUCT_STAT struct stat
60#endif
61
18enum { 62enum {
19 EIO_QUIT, 63 EIO_CUSTOM,
20 EIO_OPEN, EIO_CLOSE, EIO_DUP2, 64 EIO_OPEN, EIO_CLOSE, EIO_DUP2,
21 EIO_READ, EIO_WRITE, 65 EIO_READ, EIO_WRITE,
22 EIO_READAHEAD, EIO_SENDFILE, 66 EIO_READAHEAD, EIO_SENDFILE,
23 EIO_STAT, EIO_LSTAT, EIO_FSTAT, 67 EIO_STAT, EIO_LSTAT, EIO_FSTAT,
24 EIO_TRUNCATE, EIO_FTRUNCATE, 68 EIO_TRUNCATE, EIO_FTRUNCATE,
25 EIO_UTIME, EIO_FUTIME, 69 EIO_UTIME, EIO_FUTIME,
26 EIO_CHMOD, EIO_FCHMOD, 70 EIO_CHMOD, EIO_FCHMOD,
27 EIO_CHOWN, EIO_FCHOWN, 71 EIO_CHOWN, EIO_FCHOWN,
28 EIO_SYNC, EIO_FSYNC, EIO_FDATASYNC, 72 EIO_SYNC, EIO_FSYNC, EIO_FDATASYNC,
73 EIO_MSYNC, EIO_MTOUCH, EIO_SYNC_FILE_RANGE,
29 EIO_UNLINK, EIO_RMDIR, EIO_MKDIR, EIO_RENAME, 74 EIO_UNLINK, EIO_RMDIR, EIO_MKDIR, EIO_RENAME,
30 EIO_MKNOD, EIO_READDIR, 75 EIO_MKNOD, EIO_READDIR,
31 EIO_LINK, EIO_SYMLINK, EIO_READLINK, 76 EIO_LINK, EIO_SYMLINK, EIO_READLINK,
32 EIO_GROUP, EIO_NOP, 77 EIO_GROUP, EIO_NOP,
33 EIO_BUSY, 78 EIO_BUSY
79};
80
81/* eio_sync_file_range flags */
82
83enum {
84 EIO_SYNC_FILE_RANGE_WAIT_BEFORE = 1,
85 EIO_SYNC_FILE_RANGE_WRITE = 2,
86 EIO_SYNC_FILE_RANGE_WAIT_AFTER = 4
34}; 87};
35 88
36typedef double eio_tstamp; /* feel free to use double in your code directly */ 89typedef double eio_tstamp; /* feel free to use double in your code directly */
37 90
38/* eio request structure */ 91/* eio request structure */
39/* this structure is mostly read-only */ 92/* this structure is mostly read-only */
40struct eio_req 93struct eio_req
41{ 94{
42 eio_req volatile *next; /* private */ 95 eio_req volatile *next; /* private ETP */
43 96
44 ssize_t result; /* result of syscall, e.g. result = read (... */ 97 ssize_t result; /* result of syscall, e.g. result = read (... */
45 off_t offs; /* read, write, truncate, readahead: file offset; mknod: dev_t */ 98 off_t offs; /* read, write, truncate, readahead, sync_file_range: file offset */
46 size_t size; /* read, write, readahead, sendfile: length */ 99 size_t size; /* read, write, readahead, sendfile, msync, sync_file_range: length */
47 void *ptr1; /* all applicable requests: pathname, old name */ 100 void *ptr1; /* all applicable requests: pathname, old name */
48 void *ptr2; /* all applicable requests: new name or memory buffer */ 101 void *ptr2; /* all applicable requests: new name or memory buffer */
49 eio_tstamp nv1; /* utime, futime: atime; busy: sleep time */ 102 eio_tstamp nv1; /* utime, futime: atime; busy: sleep time */
50 eio_tstamp nv2; /* utime, futime: mtime */ 103 eio_tstamp nv2; /* utime, futime: mtime */
51 104
52 int type; /* EIO_xxx constant */ 105 int type; /* EIO_xxx constant ETP */
53 int int1; /* all applicable requests: file descriptor; sendfile: output fd; open: flags */ 106 int int1; /* all applicable requests: file descriptor; sendfile: output fd; open, msync: flags */
54 long int2; /* chown, fchown: uid; sendfile: input fd; open, chmod, mkdir, mknod: file mode */ 107 long int2; /* chown, fchown: uid; sendfile: input fd; open, chmod, mkdir, mknod: file mode, sync_file_range: flags */
55 long int3; /* chown, fchown: gid */ 108 long int3; /* chown, fchown: gid; mknod: dev_t */
56 int errorno; /* errno value on syscall return */ 109 int errorno; /* errno value on syscall return */
57 110
58 unsigned char flags; /* private */ 111 unsigned char flags; /* private */
59 unsigned char pri; /* the priority */ 112 signed char pri; /* the priority */
60 113
61 void (*feed)(eio_req *req); 114 void *data;
115 eio_cb finish;
116 void (*destroy)(eio_req *req); /* called when requets no longer needed */
117 void (*feed)(eio_req *req); /* only used for group requests */
62 118
63 EIO_COMMON; 119 EIO_REQ_MEMBERS
64 120
65 eio_req *grp, *grp_prev, *grp_next, *grp_first; /* private */ 121 eio_req *grp, *grp_prev, *grp_next, *grp_first; /* private */
66}; 122};
67 123
124/* _private_ flags */
68enum { 125enum {
69 EIO_FLAG_CANCELLED = 0x01, /* request was cancelled */ 126 EIO_FLAG_CANCELLED = 0x01, /* request was cancelled */
127 EIO_FLAG_PTR1_FREE = 0x02, /* need to free(ptr1) */
70 EIO_FLAG_PTR2_FREE = 0x02, /* need to free(ptr2) */ 128 EIO_FLAG_PTR2_FREE = 0x04, /* need to free(ptr2) */
129 EIO_FLAG_GROUPADD = 0x08 /* some request was added to the group */
71}; 130};
72 131
73enum { 132enum {
74 EIO_PRI_MIN = -4, 133 EIO_PRI_MIN = -4,
75 EIO_PRI_MAX = 4, 134 EIO_PRI_MAX = 4,
76
77 EIO_DEFAULT_PRI = 0, 135 EIO_PRI_DEFAULT = 0,
78 EIO_PRI_BIAS = -EIO_PRI_MIN,
79 EIO_NUM_PRI = EIO_PRI_MAX + EIO_PRI_BIAS + 1,
80}; 136};
81 137
82/* returns < 0 on error, errno set 138/* returns < 0 on error, errno set
83 * need_poll, if non-zero, will be called when results are available 139 * 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). 140 * and eio_poll_cb needs to be invoked (it MUST NOT call eio_poll_cb itself).
… …
92 148
93/* stop polling if poll took longer than duration seconds */ 149/* stop polling if poll took longer than duration seconds */
94void eio_set_max_poll_time (eio_tstamp nseconds); 150void eio_set_max_poll_time (eio_tstamp nseconds);
95/* do not handle more then count requests in one call to eio_poll_cb */ 151/* do not handle more then count requests in one call to eio_poll_cb */
96void eio_set_max_poll_reqs (unsigned int nreqs); 152void eio_set_max_poll_reqs (unsigned int nreqs);
97/* when != 0, then eio_submit blocks as long as nready > count */
98void eio_set_max_outstanding (unsigned int maxreqs);
99/* set maxinum number of idle threads */
100void eio_set_max_idle (unsigned int nthreads);
101 153
102/* set minimum required number 154/* set minimum required number
103 * maximum wanted number 155 * maximum wanted number
104 * or maximum idle number of threads */ 156 * or maximum idle number of threads */
105void eio_set_min_parallel (unsigned int nthreads); 157void eio_set_min_parallel (unsigned int nthreads);
… …
110unsigned int eio_nready (void); /* number of not-yet handled requests */ 162unsigned int eio_nready (void); /* number of not-yet handled requests */
111unsigned int eio_npending (void); /* numbe rof finished but unhandled requests */ 163unsigned int eio_npending (void); /* numbe rof finished but unhandled requests */
112unsigned int eio_nthreads (void); /* number of worker threads in use currently */ 164unsigned int eio_nthreads (void); /* number of worker threads in use currently */
113 165
114/*****************************************************************************/ 166/*****************************************************************************/
115/* high-level request API */ 167/* convinience wrappers */
116 168
117eio_req *eio_fsync (int fd, eio_cb cb); 169#ifndef EIO_NO_WRAPPERS
118eio_req *eio_fdatasync (int fd, eio_cb cb); 170eio_req *eio_nop (int pri, eio_cb cb, void *data); /* does nothing except go through the whole process */
119eio_req *eio_dupclose (int fd, eio_cb cb);
120eio_req *eio_readahead (int fd, off_t offset, size_t length, eio_cb cb);
121eio_req *eio_read (int fd, off_t offs, size_t length, char *data, eio_cb cb);
122eio_req *eio_write (int fd, off_t offs, size_t length, char *data, eio_cb cb);
123eio_req *eio_fstat (int fd, eio_cb cb); /* stat buffer=ptr2 allocates dynamically */
124eio_req *eio_futime (int fd, eio_tstamp atime, eio_tstamp mtime, eio_cb cb);
125eio_req *eio_ftruncate (int fd, off_t offset, eio_cb cb);
126eio_req *eio_fchmod (int fd, mode_t mode, eio_cb cb);
127eio_req *eio_fchown (int fd, uid_t uid, gid_t gid, eio_cb cb);
128eio_req *eio_dup2 (int fd, int fd2, eio_cb cb);
129eio_req *eio_sendfile (int out_fd, int in_fd, off_t in_offset, size_t length, eio_cb cb);
130eio_req *eio_open (const char *path, int flags, mode_t mode, eio_cb cb);
131eio_req *eio_readlink (const char *path, eio_cb cb); /* result=ptr2 allocated dynamically */
132eio_req *eio_stat (const char *path, eio_cb cb); /* stat buffer=ptr2 allocates dynamically */
133eio_req *eio_lstat (const char *path, eio_cb cb); /* stat buffer=ptr2 allocates dynamically */
134eio_req *eio_utime (const char *path, eio_tstamp atime, eio_tstamp mtime, eio_cb cb);
135eio_req *eio_truncate (const char *path, off_t offset, eio_cb cb);
136eio_req *eio_chmod (const char *path, mode_t mode, eio_cb cb);
137eio_req *eio_mkdir (const char *path, mode_t mode, eio_cb cb);
138eio_req *eio_chown (const char *path, uid_t uid, gid_t gid, eio_cb cb);
139eio_req *eio_unlink (const char *path, eio_cb cb);
140eio_req *eio_rmdir (const char *path, eio_cb cb);
141eio_req *eio_readdir (const char *path, eio_cb cb); /* result=ptr2 allocated dynamically */
142eio_req *eio_mknod (const char *path, mode_t mode, dev_t dev, eio_cb cb);
143eio_req *eio_busy (eio_tstamp delay, eio_cb cb); /* ties a thread for this long, simulating busyness */ 171eio_req *eio_busy (eio_tstamp delay, int pri, eio_cb cb, void *data); /* ties a thread for this long, simulating busyness */
144eio_req *eio_nop (eio_cb cb); /* does nothing except go through the whole process */ 172eio_req *eio_sync (int pri, eio_cb cb, void *data);
173eio_req *eio_fsync (int fd, int pri, eio_cb cb, void *data);
174eio_req *eio_fdatasync (int fd, int pri, eio_cb cb, void *data);
175eio_req *eio_msync (void *addr, size_t length, int flags, int pri, eio_cb cb, void *data);
176eio_req *eio_mtouch (void *addr, size_t length, int flags, int pri, eio_cb cb, void *data);
177eio_req *eio_sync_file_range (int fd, off_t offset, size_t nbytes, unsigned int flags, int pri, eio_cb cb, void *data);
178eio_req *eio_close (int fd, int pri, eio_cb cb, void *data);
179eio_req *eio_readahead (int fd, off_t offset, size_t length, int pri, eio_cb cb, void *data);
180eio_req *eio_read (int fd, void *buf, size_t length, off_t offset, int pri, eio_cb cb, void *data);
181eio_req *eio_write (int fd, void *buf, size_t length, off_t offset, int pri, eio_cb cb, void *data);
182eio_req *eio_fstat (int fd, int pri, eio_cb cb, void *data); /* stat buffer=ptr2 allocated dynamically */
183eio_req *eio_futime (int fd, eio_tstamp atime, eio_tstamp mtime, int pri, eio_cb cb, void *data);
184eio_req *eio_ftruncate (int fd, off_t offset, int pri, eio_cb cb, void *data);
185eio_req *eio_fchmod (int fd, mode_t mode, int pri, eio_cb cb, void *data);
186eio_req *eio_fchown (int fd, uid_t uid, gid_t gid, int pri, eio_cb cb, void *data);
187eio_req *eio_dup2 (int fd, int fd2, int pri, eio_cb cb, void *data);
188eio_req *eio_sendfile (int out_fd, int in_fd, off_t in_offset, size_t length, int pri, eio_cb cb, void *data);
189eio_req *eio_open (const char *path, int flags, mode_t mode, int pri, eio_cb cb, void *data);
190eio_req *eio_utime (const char *path, eio_tstamp atime, eio_tstamp mtime, int pri, eio_cb cb, void *data);
191eio_req *eio_truncate (const char *path, off_t offset, int pri, eio_cb cb, void *data);
192eio_req *eio_chown (const char *path, uid_t uid, gid_t gid, int pri, eio_cb cb, void *data);
193eio_req *eio_chmod (const char *path, mode_t mode, int pri, eio_cb cb, void *data);
194eio_req *eio_mkdir (const char *path, mode_t mode, int pri, eio_cb cb, void *data);
195eio_req *eio_readdir (const char *path, int pri, eio_cb cb, void *data); /* result=ptr2 allocated dynamically */
196eio_req *eio_rmdir (const char *path, int pri, eio_cb cb, void *data);
197eio_req *eio_unlink (const char *path, int pri, eio_cb cb, void *data);
198eio_req *eio_readlink (const char *path, int pri, eio_cb cb, void *data); /* result=ptr2 allocated dynamically */
199eio_req *eio_stat (const char *path, int pri, eio_cb cb, void *data); /* stat buffer=ptr2 allocated dynamically */
200eio_req *eio_lstat (const char *path, int pri, eio_cb cb, void *data); /* stat buffer=ptr2 allocated dynamically */
201eio_req *eio_mknod (const char *path, mode_t mode, dev_t dev, int pri, eio_cb cb, void *data);
202eio_req *eio_link (const char *path, const char *new_path, int pri, eio_cb cb, void *data);
203eio_req *eio_symlink (const char *path, const char *new_path, int pri, eio_cb cb, void *data);
204eio_req *eio_rename (const char *path, const char *new_path, int pri, eio_cb cb, void *data);
205eio_req *eio_custom (eio_cb execute, int pri, eio_cb cb, void *data);
206#endif
145 207
208/*****************************************************************************/
146/* for groups */ 209/* groups */
210
147eio_req *eio_grp (eio_cb cb); 211eio_req *eio_grp (eio_cb cb, void *data);
148void eio_grp_feed (eio_req *grp, void (*feed)(eio_req *req), int limit); 212void eio_grp_feed (eio_req *grp, void (*feed)(eio_req *req), int limit);
149void eio_grp_limit (eio_req *grp, int limit); 213void eio_grp_limit (eio_req *grp, int limit);
150void eio_grp_add (eio_req *grp, eio_req *req); 214void eio_grp_add (eio_req *grp, eio_req *req);
151void eio_grp_cancel (eio_req *grp); /* cancels all sub requests but not the group */ 215void eio_grp_cancel (eio_req *grp); /* cancels all sub requests but not the group */
152 216
153/*****************************************************************************/ 217/*****************************************************************************/
154/* low-level request API */ 218/* request api */
155
156/* must be used to initialise eio_req's */
157#define EIO_INIT(req,prio,finish_cb, destroy_cb) \
158 memset ((req), 0, sizeof (eio_req)); \
159 (req)->pri = (prio) + EIO_PRI_BIAS; \
160 (req)->finish = (finish_cb); \
161 (req)->destroy = (destroy_cb)
162 219
163/* true if the request was cancelled, useful in the invoke callback */ 220/* true if the request was cancelled, useful in the invoke callback */
164#define EIO_CANCELLED(req) ((req)->flags & EIO_FLAG_CANCELLED) 221#define EIO_CANCELLED(req) ((req)->flags & EIO_FLAG_CANCELLED)
165 222
223#define EIO_RESULT(req) ((req)->result)
224/* returns a pointer to the result buffer allocated by eio */
225#define EIO_BUF(req) ((req)->ptr2)
226#define EIO_STAT_BUF(req) ((EIO_STRUCT_STAT *)EIO_BUF(req))
227#define EIO_PATH(req) ((char *)(req)->ptr1)
228
166/* submit a request for execution */ 229/* submit a request for execution */
167void eio_submit (eio_req *req); 230void eio_submit (eio_req *req);
168/* cancel a request as soon fast as possible */ 231/* cancel a request as soon fast as possible, if possible */
169void eio_cancel (eio_req *req); 232void eio_cancel (eio_req *req);
170/* destroy a request that has never been submitted */ 233/* destroy a request that has never been submitted */
171void eio_destroy (eio_req *req); 234void eio_destroy (eio_req *req);
172 235
173#endif 236/*****************************************************************************/
237/* convinience functions */
174 238
239ssize_t eio_sendfile_sync (int ofd, int ifd, off_t offset, size_t count);
240
241#ifdef __cplusplus
242}
243#endif
244
245#endif
246

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