ViewVC Help
View File | Revision Log | Show Annotations | Download File
/cvs/libeio/eio.h
(Generate patch)

Comparing libeio/eio.h (file contents):
Revision 1.18 by root, Wed Oct 22 18:15:36 2008 UTC vs.
Revision 1.35 by root, Tue Jul 5 20:34:42 2011 UTC

1/* 1/*
2 * libeio API header 2 * libeio API header
3 * 3 *
4 * Copyright (c) 2007,2008 Marc Alexander Lehmann <libeio@schmorp.de> 4 * Copyright (c) 2007,2008,2009,2010,2011 Marc Alexander Lehmann <libeio@schmorp.de>
5 * All rights reserved. 5 * All rights reserved.
6 * 6 *
7 * Redistribution and use in source and binary forms, with or without modifica- 7 * Redistribution and use in source and binary forms, with or without modifica-
8 * tion, are permitted provided that the following conditions are met: 8 * tion, are permitted provided that the following conditions are met:
9 * 9 *
… …
43#ifdef __cplusplus 43#ifdef __cplusplus
44extern "C" { 44extern "C" {
45#endif 45#endif
46 46
47#include <stddef.h> 47#include <stddef.h>
48#include <signal.h>
48#include <sys/types.h> 49#include <sys/types.h>
49 50
50typedef struct eio_req eio_req; 51typedef struct eio_req eio_req;
52typedef struct eio_dirent eio_dirent;
51 53
52typedef int (*eio_cb)(eio_req *req); 54typedef int (*eio_cb)(eio_req *req);
53 55
54#ifndef EIO_REQ_MEMBERS 56#ifndef EIO_REQ_MEMBERS
55# define EIO_REQ_MEMBERS 57# define EIO_REQ_MEMBERS
… …
57 59
58#ifndef EIO_STRUCT_STAT 60#ifndef EIO_STRUCT_STAT
59# define EIO_STRUCT_STAT struct stat 61# define EIO_STRUCT_STAT struct stat
60#endif 62#endif
61 63
64#ifndef EIO_STRUCT_STATVFS
65# define EIO_STRUCT_STATVFS struct statvfs
66#endif
67
68/* for readdir */
69
70/* eio_readdir flags */
62enum { 71enum
72{
73 EIO_READDIR_DENTS = 0x01, /* ptr2 contains eio_dirents, not just the (unsorted) names */
74 EIO_READDIR_DIRS_FIRST = 0x02, /* dirents gets sorted into a good stat() ing order to find directories first */
75 EIO_READDIR_STAT_ORDER = 0x04, /* dirents gets sorted into a good stat() ing order to quickly stat all files */
76 EIO_READDIR_FOUND_UNKNOWN = 0x80, /* set by eio_readdir when *_ARRAY was set and any TYPE=UNKNOWN's were found */
77
78 EIO_READDIR_CUSTOM1 = 0x100, /* for use by apps */
79 EIO_READDIR_CUSTOM2 = 0x200 /* for use by apps */
80};
81
82/* using "typical" values in the hope that the compiler will do something sensible */
83enum eio_dtype
84{
85 EIO_DT_UNKNOWN = 0,
86 EIO_DT_FIFO = 1,
87 EIO_DT_CHR = 2,
88 EIO_DT_MPC = 3, /* multiplexed char device (v7+coherent) */
89 EIO_DT_DIR = 4,
90 EIO_DT_NAM = 5, /* xenix special named file */
91 EIO_DT_BLK = 6,
92 EIO_DT_MPB = 7, /* multiplexed block device (v7+coherent) */
93 EIO_DT_REG = 8,
94 EIO_DT_NWK = 9, /* HP-UX network special */
95 EIO_DT_CMP = 9, /* VxFS compressed */
96 EIO_DT_LNK = 10,
97 /* DT_SHAD = 11,*/
98 EIO_DT_SOCK = 12,
99 EIO_DT_DOOR = 13, /* solaris door */
100 EIO_DT_WHT = 14,
101 EIO_DT_MAX = 15 /* highest DT_VALUE ever, hopefully */
102};
103
104struct eio_dirent
105{
106 int nameofs; /* offset of null-terminated name string in (char *)req->ptr2 */
107 unsigned short namelen; /* size of filename without trailing 0 */
108 unsigned char type; /* one of EIO_DT_* */
109 signed char score; /* internal use */
110 ino_t inode; /* the inode number, if available, otherwise unspecified */
111};
112
113/* eio_msync flags */
114enum
115{
116 EIO_MS_ASYNC = 1,
117 EIO_MS_INVALIDATE = 2,
118 EIO_MS_SYNC = 4
119};
120
121/* eio_mtouch flags */
122
123enum
124{
125 EIO_MT_MODIFY = 1
126};
127
128/* eio_sync_file_range flags */
129
130enum
131{
132 EIO_SYNC_FILE_RANGE_WAIT_BEFORE = 1,
133 EIO_SYNC_FILE_RANGE_WRITE = 2,
134 EIO_SYNC_FILE_RANGE_WAIT_AFTER = 4
135};
136
137typedef double eio_tstamp; /* feel free to use double in your code directly */
138
139/* the eio request structure */
140
141enum
142{
63 EIO_CUSTOM, 143 EIO_CUSTOM,
64 EIO_OPEN, EIO_CLOSE, EIO_DUP2, 144 EIO_OPEN, EIO_CLOSE, EIO_DUP2,
65 EIO_READ, EIO_WRITE, 145 EIO_READ, EIO_WRITE,
66 EIO_READAHEAD, EIO_SENDFILE, 146 EIO_READAHEAD, EIO_SENDFILE,
67 EIO_STAT, EIO_LSTAT, EIO_FSTAT, 147 EIO_STAT, EIO_LSTAT, EIO_FSTAT,
148 EIO_STATVFS, EIO_FSTATVFS,
68 EIO_TRUNCATE, EIO_FTRUNCATE, 149 EIO_TRUNCATE, EIO_FTRUNCATE,
69 EIO_UTIME, EIO_FUTIME, 150 EIO_UTIME, EIO_FUTIME,
70 EIO_CHMOD, EIO_FCHMOD, 151 EIO_CHMOD, EIO_FCHMOD,
71 EIO_CHOWN, EIO_FCHOWN, 152 EIO_CHOWN, EIO_FCHOWN,
72 EIO_SYNC, EIO_FSYNC, EIO_FDATASYNC, 153 EIO_SYNC, EIO_FSYNC, EIO_FDATASYNC,
73 EIO_MSYNC, EIO_MTOUCH, EIO_SYNC_FILE_RANGE, 154 EIO_MSYNC, EIO_MTOUCH, EIO_SYNC_FILE_RANGE,
155 EIO_MLOCK, EIO_MLOCKALL,
74 EIO_UNLINK, EIO_RMDIR, EIO_MKDIR, EIO_RENAME, 156 EIO_UNLINK, EIO_RMDIR, EIO_MKDIR, EIO_RENAME,
75 EIO_MKNOD, EIO_READDIR, 157 EIO_MKNOD, EIO_READDIR,
76 EIO_LINK, EIO_SYMLINK, EIO_READLINK, 158 EIO_LINK, EIO_SYMLINK, EIO_READLINK, EIO_REALPATH,
77 EIO_GROUP, EIO_NOP, 159 EIO_GROUP, EIO_NOP,
78 EIO_BUSY 160 EIO_BUSY
79}; 161};
80 162
81/* eio_sync_file_range flags */ 163/* mlockall constants */
82
83enum { 164enum
84 EIO_SYNC_FILE_RANGE_WAIT_BEFORE = 1,
85 EIO_SYNC_FILE_RANGE_WRITE = 2,
86 EIO_SYNC_FILE_RANGE_WAIT_AFTER = 4
87};
88
89typedef double eio_tstamp; /* feel free to use double in your code directly */
90
91/* eio request structure */
92/* this structure is mostly read-only */
93struct eio_req
94{ 165{
95 eio_req volatile *next; /* private ETP */ 166 EIO_MCL_CURRENT = 1,
96 167 EIO_MCL_FUTURE = 2,
97 ssize_t result; /* result of syscall, e.g. result = read (... */
98 off_t offs; /* read, write, truncate, readahead, sync_file_range: file offset */
99 size_t size; /* read, write, readahead, sendfile, msync, sync_file_range: length */
100 void *ptr1; /* all applicable requests: pathname, old name */
101 void *ptr2; /* all applicable requests: new name or memory buffer */
102 eio_tstamp nv1; /* utime, futime: atime; busy: sleep time */
103 eio_tstamp nv2; /* utime, futime: mtime */
104
105 int type; /* EIO_xxx constant ETP */
106 int int1; /* all applicable requests: file descriptor; sendfile: output fd; open, msync: flags */
107 long int2; /* chown, fchown: uid; sendfile: input fd; open, chmod, mkdir, mknod: file mode, sync_file_range: flags */
108 long int3; /* chown, fchown: gid; mknod: dev_t */
109 int errorno; /* errno value on syscall return */
110
111 unsigned char flags; /* private */
112 signed char pri; /* the priority */
113
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 */
118
119 EIO_REQ_MEMBERS
120
121 eio_req *grp, *grp_prev, *grp_next, *grp_first; /* private */
122}; 168};
123 169
124/* _private_ flags */ 170/* request priorities */
125enum {
126 EIO_FLAG_CANCELLED = 0x01, /* request was cancelled */
127 EIO_FLAG_PTR1_FREE = 0x02, /* need to free(ptr1) */
128 EIO_FLAG_PTR2_FREE = 0x04, /* need to free(ptr2) */
129 EIO_FLAG_GROUPADD = 0x08 /* some request was added to the group */
130};
131 171
132enum { 172enum {
133 EIO_PRI_MIN = -4, 173 EIO_PRI_MIN = -4,
134 EIO_PRI_MAX = 4, 174 EIO_PRI_MAX = 4,
135 EIO_PRI_DEFAULT = 0, 175 EIO_PRI_DEFAULT = 0,
136}; 176};
177
178/* eio request structure */
179/* this structure is mostly read-only */
180/* when initialising it, all members must be zero-initialised */
181struct eio_req
182{
183 eio_req volatile *next; /* private ETP */
184
185 ssize_t result; /* result of syscall, e.g. result = read (... */
186 off_t offs; /* read, write, truncate, readahead, sync_file_range: file offset, mknod: dev_t */
187 size_t size; /* read, write, readahead, sendfile, msync, mlock, sync_file_range: length */
188 void *ptr1; /* all applicable requests: pathname, old name; readdir: optional eio_dirents */
189 void *ptr2; /* all applicable requests: new name or memory buffer; readdir: name strings */
190 eio_tstamp nv1; /* utime, futime: atime; busy: sleep time */
191 eio_tstamp nv2; /* utime, futime: mtime */
192
193 int type; /* EIO_xxx constant ETP */
194 int int1; /* all applicable requests: file descriptor; sendfile: output fd; open, msync, mlockall, readdir: flags */
195 long int2; /* chown, fchown: uid; sendfile: input fd; open, chmod, mkdir, mknod: file mode, sync_file_range: flags */
196 long int3; /* chown, fchown: gid */
197 int errorno; /* errno value on syscall return */
198
199#if __i386 || __amd64
200 unsigned char cancelled;
201#else
202 sig_atomic_t cancelled;
203#endif
204
205 unsigned char flags; /* private */
206 signed char pri; /* the priority */
207
208 void *data;
209 eio_cb finish;
210 void (*destroy)(eio_req *req); /* called when request no longer needed */
211 void (*feed)(eio_req *req); /* only used for group requests */
212
213 EIO_REQ_MEMBERS
214
215 eio_req *grp, *grp_prev, *grp_next, *grp_first; /* private */
216};
217
218/* _private_ request flags */
219enum {
220 EIO_FLAG_PTR1_FREE = 0x01, /* need to free(ptr1) */
221 EIO_FLAG_PTR2_FREE = 0x02, /* need to free(ptr2) */
222 EIO_FLAG_GROUPADD = 0x04 /* some request was added to the group */
223};
224
225/* undocumented/unsupported/private helper */
226/*void eio_page_align (void **addr, size_t *length);*/
137 227
138/* returns < 0 on error, errno set 228/* returns < 0 on error, errno set
139 * need_poll, if non-zero, will be called when results are available 229 * need_poll, if non-zero, will be called when results are available
140 * and eio_poll_cb needs to be invoked (it MUST NOT call eio_poll_cb itself). 230 * and eio_poll_cb needs to be invoked (it MUST NOT call eio_poll_cb itself).
141 * done_poll is called when the need to poll is gone. 231 * done_poll is called when the need to poll is gone.
… …
155 * maximum wanted number 245 * maximum wanted number
156 * or maximum idle number of threads */ 246 * or maximum idle number of threads */
157void eio_set_min_parallel (unsigned int nthreads); 247void eio_set_min_parallel (unsigned int nthreads);
158void eio_set_max_parallel (unsigned int nthreads); 248void eio_set_max_parallel (unsigned int nthreads);
159void eio_set_max_idle (unsigned int nthreads); 249void eio_set_max_idle (unsigned int nthreads);
250void eio_set_idle_timeout (unsigned int seconds);
160 251
161unsigned int eio_nreqs (void); /* number of requests in-flight */ 252unsigned int eio_nreqs (void); /* number of requests in-flight */
162unsigned int eio_nready (void); /* number of not-yet handled requests */ 253unsigned int eio_nready (void); /* number of not-yet handled requests */
163unsigned int eio_npending (void); /* numbe rof finished but unhandled requests */ 254unsigned int eio_npending (void); /* numbe rof finished but unhandled requests */
164unsigned int eio_nthreads (void); /* number of worker threads in use currently */ 255unsigned int eio_nthreads (void); /* number of worker threads in use currently */
165 256
166/*****************************************************************************/ 257/*****************************************************************************/
167/* convinience wrappers */ 258/* convenience wrappers */
168 259
169#ifndef EIO_NO_WRAPPERS 260#ifndef EIO_NO_WRAPPERS
170eio_req *eio_nop (int pri, eio_cb cb, void *data); /* does nothing except go through the whole process */ 261eio_req *eio_nop (int pri, eio_cb cb, void *data); /* does nothing except go through the whole process */
171eio_req *eio_busy (eio_tstamp delay, int pri, eio_cb cb, void *data); /* ties a thread for this long, simulating busyness */ 262eio_req *eio_busy (eio_tstamp delay, int pri, eio_cb cb, void *data); /* ties a thread for this long, simulating busyness */
172eio_req *eio_sync (int pri, eio_cb cb, void *data); 263eio_req *eio_sync (int pri, eio_cb cb, void *data);
173eio_req *eio_fsync (int fd, int pri, eio_cb cb, void *data); 264eio_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); 265eio_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); 266eio_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); 267eio_req *eio_mtouch (void *addr, size_t length, int flags, int pri, eio_cb cb, void *data);
268eio_req *eio_mlock (void *addr, size_t length, int pri, eio_cb cb, void *data);
269eio_req *eio_mlockall (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); 270eio_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); 271eio_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); 272eio_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); 273eio_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); 274eio_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 */ 275eio_req *eio_fstat (int fd, int pri, eio_cb cb, void *data); /* stat buffer=ptr2 allocated dynamically */
276eio_req *eio_fstatvfs (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); 277eio_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); 278eio_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); 279eio_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); 280eio_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); 281eio_req *eio_dup2 (int fd, int fd2, 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); 284eio_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); 285eio_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); 286eio_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); 287eio_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); 288eio_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 */ 289eio_req *eio_readdir (const char *path, int flags, 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); 290eio_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); 291eio_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 */ 292eio_req *eio_readlink (const char *path, int pri, eio_cb cb, void *data); /* result=ptr2 allocated dynamically */
293eio_req *eio_realpath (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 */ 294eio_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 */ 295eio_req *eio_lstat (const char *path, int pri, eio_cb cb, void *data); /* stat buffer=ptr2 allocated dynamically */
296eio_req *eio_statvfs (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); 297eio_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); 298eio_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); 299eio_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); 300eio_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); 301eio_req *eio_custom (void (*execute)(eio_req *), int pri, eio_cb cb, void *data);
206#endif 302#endif
207 303
208/*****************************************************************************/ 304/*****************************************************************************/
209/* groups */ 305/* groups */
210 306
… …
216 312
217/*****************************************************************************/ 313/*****************************************************************************/
218/* request api */ 314/* request api */
219 315
220/* true if the request was cancelled, useful in the invoke callback */ 316/* true if the request was cancelled, useful in the invoke callback */
221#define EIO_CANCELLED(req) ((req)->flags & EIO_FLAG_CANCELLED) 317#define EIO_CANCELLED(req) ((req)->cancelled)
222 318
223#define EIO_RESULT(req) ((req)->result) 319#define EIO_RESULT(req) ((req)->result)
224/* returns a pointer to the result buffer allocated by eio */ 320/* returns a pointer to the result buffer allocated by eio */
225#define EIO_BUF(req) ((req)->ptr2) 321#define EIO_BUF(req) ((req)->ptr2)
226#define EIO_STAT_BUF(req) ((EIO_STRUCT_STAT *)EIO_BUF(req)) 322#define EIO_STAT_BUF(req) ((EIO_STRUCT_STAT *)EIO_BUF(req))
323#define EIO_STATVFS_BUF(req) ((EIO_STRUCT_STATVFS *)EIO_BUF(req))
227#define EIO_PATH(req) ((char *)(req)->ptr1) 324#define EIO_PATH(req) ((char *)(req)->ptr1)
228 325
229/* submit a request for execution */ 326/* submit a request for execution */
230void eio_submit (eio_req *req); 327void eio_submit (eio_req *req);
231/* cancel a request as soon fast as possible, if possible */ 328/* cancel a request as soon fast as possible, if possible */
232void eio_cancel (eio_req *req); 329void eio_cancel (eio_req *req);
233/* destroy a request that has never been submitted */
234void eio_destroy (eio_req *req);
235 330
236/*****************************************************************************/ 331/*****************************************************************************/
237/* convinience functions */ 332/* convenience functions */
238 333
239ssize_t eio_sendfile_sync (int ofd, int ifd, off_t offset, size_t count); 334ssize_t eio_sendfile_sync (int ofd, int ifd, off_t offset, size_t count);
240 335
241#ifdef __cplusplus 336#ifdef __cplusplus
242} 337}

Diff Legend

– Removed lines
+ Added lines
< Changed lines
> Changed lines