--- libeio/eio.h 2008/05/10 23:33:40 1.2 +++ libeio/eio.h 2008/06/17 23:58:48 1.15 @@ -1,22 +1,65 @@ +/* + * libeio API header + * + * Copyright (c) 2007,2008 Marc Alexander Lehmann + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without modifica- + * tion, are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER- + * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO + * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE- + * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, + * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; + * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, + * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH- + * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + * + * Alternatively, the contents of this file may be used under the terms of + * the GNU General Public License ("GPL") version 2 or any later version, + * in which case the provisions of the GPL are applicable instead of + * the above. If you wish to allow the use of your version of this file + * only under the terms of the GPL and not to allow others to use your + * version of this file under the BSD license, indicate your decision + * by deleting the provisions above and replace them with the notice + * and other provisions required by the GPL. If you do not delete the + * provisions above, a recipient may use your version of this file under + * either the BSD or the GPL. + */ + #ifndef EIO_H_ #define EIO_H_ +#ifdef __cplusplus +extern "C" { +#endif + #include -#include +#include typedef struct eio_req eio_req; typedef int (*eio_cb)(eio_req *req); -#ifndef EIO_COMMON -# define EIO_COMMON \ - eio_cb finish; \ - void (*destroy)(eio_req *req);\ - void *data +#ifndef EIO_REQ_MEMBERS +# define EIO_REQ_MEMBERS +#endif + +#ifndef EIO_STRUCT_STAT +# define EIO_STRUCT_STAT struct stat #endif enum { - EIO_QUIT, EIO_OPEN, EIO_CLOSE, EIO_DUP2, EIO_READ, EIO_WRITE, EIO_READAHEAD, EIO_SENDFILE, @@ -30,7 +73,7 @@ EIO_MKNOD, EIO_READDIR, EIO_LINK, EIO_SYMLINK, EIO_READLINK, EIO_GROUP, EIO_NOP, - EIO_BUSY, + EIO_BUSY, EIO_CUSTOM }; typedef double eio_tstamp; /* feel free to use double in your code directly */ @@ -39,44 +82,45 @@ /* this structure is mostly read-only */ struct eio_req { - eio_req volatile *next; /* private */ + eio_req volatile *next; /* private ETP */ ssize_t result; /* result of syscall, e.g. result = read (... */ - off_t offs; /* read, write, truncate, readahead: file offset; mknod: dev_t */ + off_t offs; /* read, write, truncate, readahead: file offset */ size_t size; /* read, write, readahead, sendfile: length */ void *ptr1; /* all applicable requests: pathname, old name */ void *ptr2; /* all applicable requests: new name or memory buffer */ eio_tstamp nv1; /* utime, futime: atime; busy: sleep time */ eio_tstamp nv2; /* utime, futime: mtime */ - int type; /* EIO_xxx constant */ + int type; /* EIO_xxx constant ETP */ int int1; /* all applicable requests: file descriptor; sendfile: output fd; open: flags */ long int2; /* chown, fchown: uid; sendfile: input fd; open, chmod, mkdir, mknod: file mode */ - long int3; /* chown, fchown: gid */ + long int3; /* chown, fchown: gid; mknod: dev_t */ int errorno; /* errno value on syscall return */ unsigned char flags; /* private */ - unsigned char pri; /* the priority */ + signed char pri; /* the priority */ - void (*feed)(eio_req *req); + void *data; + eio_cb finish; + void (*destroy)(eio_req *req); /* called when requets no longer needed */ + void (*feed)(eio_req *req); /* only used for group requests */ - EIO_COMMON; + EIO_REQ_MEMBERS eio_req *grp, *grp_prev, *grp_next, *grp_first; /* private */ }; enum { EIO_FLAG_CANCELLED = 0x01, /* request was cancelled */ - EIO_FLAG_PTR2_FREE = 0x02, /* need to free(ptr2) */ + EIO_FLAG_PTR1_FREE = 0x02, /* need to free(ptr1) */ + EIO_FLAG_PTR2_FREE = 0x04 /* need to free(ptr2) */ }; enum { EIO_PRI_MIN = -4, EIO_PRI_MAX = 4, - - EIO_DEFAULT_PRI = 0, - EIO_PRI_BIAS = -EIO_PRI_MIN, - EIO_NUM_PRI = EIO_PRI_MAX + EIO_PRI_BIAS + 1, + EIO_PRI_DEFAULT = 0, }; /* returns < 0 on error, errno set @@ -94,10 +138,6 @@ void eio_set_max_poll_time (eio_tstamp nseconds); /* do not handle more then count requests in one call to eio_poll_cb */ void eio_set_max_poll_reqs (unsigned int nreqs); -/* when != 0, then eio_submit blocks as long as nready > count */ -void eio_set_max_outstanding (unsigned int maxreqs); -/* set maxinum number of idle threads */ -void eio_set_max_idle (unsigned int nthreads); /* set minimum required number * maximum wanted number @@ -112,63 +152,80 @@ unsigned int eio_nthreads (void); /* number of worker threads in use currently */ /*****************************************************************************/ -/* high-level request API */ +/* convinience wrappers */ -eio_req *eio_fsync (int fd, eio_cb cb); -eio_req *eio_fdatasync (int fd, eio_cb cb); -eio_req *eio_dupclose (int fd, eio_cb cb); -eio_req *eio_readahead (int fd, off_t offset, size_t length, eio_cb cb); -eio_req *eio_read (int fd, off_t offs, size_t length, char *data, eio_cb cb); -eio_req *eio_write (int fd, off_t offs, size_t length, char *data, eio_cb cb); -eio_req *eio_fstat (int fd, eio_cb cb); /* stat buffer=ptr2 allocates dynamically */ -eio_req *eio_futime (int fd, eio_tstamp atime, eio_tstamp mtime, eio_cb cb); -eio_req *eio_ftruncate (int fd, off_t offset, eio_cb cb); -eio_req *eio_fchmod (int fd, mode_t mode, eio_cb cb); -eio_req *eio_fchown (int fd, uid_t uid, gid_t gid, eio_cb cb); -eio_req *eio_dup2 (int fd, int fd2, eio_cb cb); -eio_req *eio_sendfile (int out_fd, int in_fd, off_t in_offset, size_t length, eio_cb cb); -eio_req *eio_open (const char *path, int flags, mode_t mode, eio_cb cb); -eio_req *eio_readlink (const char *path, eio_cb cb); /* result=ptr2 allocated dynamically */ -eio_req *eio_stat (const char *path, eio_cb cb); /* stat buffer=ptr2 allocates dynamically */ -eio_req *eio_lstat (const char *path, eio_cb cb); /* stat buffer=ptr2 allocates dynamically */ -eio_req *eio_utime (const char *path, eio_tstamp atime, eio_tstamp mtime, eio_cb cb); -eio_req *eio_truncate (const char *path, off_t offset, eio_cb cb); -eio_req *eio_chmod (const char *path, mode_t mode, eio_cb cb); -eio_req *eio_mkdir (const char *path, mode_t mode, eio_cb cb); -eio_req *eio_chown (const char *path, uid_t uid, gid_t gid, eio_cb cb); -eio_req *eio_unlink (const char *path, eio_cb cb); -eio_req *eio_rmdir (const char *path, eio_cb cb); -eio_req *eio_readdir (const char *path, eio_cb cb); /* result=ptr2 allocated dynamically */ -eio_req *eio_mknod (const char *path, mode_t mode, dev_t dev, eio_cb cb); -eio_req *eio_busy (eio_tstamp delay, eio_cb cb); /* ties a thread for this long, simulating busyness */ -eio_req *eio_nop (eio_cb cb); /* does nothing except go through the whole process */ +#ifndef EIO_NO_WRAPPERS +eio_req *eio_nop (int pri, eio_cb cb, void *data); /* does nothing except go through the whole process */ +eio_req *eio_busy (eio_tstamp delay, int pri, eio_cb cb, void *data); /* ties a thread for this long, simulating busyness */ +eio_req *eio_sync (int pri, eio_cb cb, void *data); +eio_req *eio_fsync (int fd, int pri, eio_cb cb, void *data); +eio_req *eio_fdatasync (int fd, int pri, eio_cb cb, void *data); +eio_req *eio_close (int fd, int pri, eio_cb cb, void *data); +eio_req *eio_readahead (int fd, off_t offset, size_t length, int pri, eio_cb cb, void *data); +eio_req *eio_read (int fd, void *buf, size_t length, off_t offset, int pri, eio_cb cb, void *data); +eio_req *eio_write (int fd, void *buf, size_t length, off_t offset, int pri, eio_cb cb, void *data); +eio_req *eio_fstat (int fd, int pri, eio_cb cb, void *data); /* stat buffer=ptr2 allocated dynamically */ +eio_req *eio_futime (int fd, eio_tstamp atime, eio_tstamp mtime, int pri, eio_cb cb, void *data); +eio_req *eio_ftruncate (int fd, off_t offset, int pri, eio_cb cb, void *data); +eio_req *eio_fchmod (int fd, mode_t mode, int pri, eio_cb cb, void *data); +eio_req *eio_fchown (int fd, uid_t uid, gid_t gid, int pri, eio_cb cb, void *data); +eio_req *eio_dup2 (int fd, int fd2, int pri, eio_cb cb, void *data); +eio_req *eio_sendfile (int out_fd, int in_fd, off_t in_offset, size_t length, int pri, eio_cb cb, void *data); +eio_req *eio_open (const char *path, int flags, mode_t mode, int pri, eio_cb cb, void *data); +eio_req *eio_utime (const char *path, eio_tstamp atime, eio_tstamp mtime, int pri, eio_cb cb, void *data); +eio_req *eio_truncate (const char *path, off_t offset, int pri, eio_cb cb, void *data); +eio_req *eio_chown (const char *path, uid_t uid, gid_t gid, int pri, eio_cb cb, void *data); +eio_req *eio_chmod (const char *path, mode_t mode, int pri, eio_cb cb, void *data); +eio_req *eio_mkdir (const char *path, mode_t mode, int pri, eio_cb cb, void *data); +eio_req *eio_readdir (const char *path, int pri, eio_cb cb, void *data); /* result=ptr2 allocated dynamically */ +eio_req *eio_rmdir (const char *path, int pri, eio_cb cb, void *data); +eio_req *eio_unlink (const char *path, int pri, eio_cb cb, void *data); +eio_req *eio_readlink (const char *path, int pri, eio_cb cb, void *data); /* result=ptr2 allocated dynamically */ +eio_req *eio_stat (const char *path, int pri, eio_cb cb, void *data); /* stat buffer=ptr2 allocated dynamically */ +eio_req *eio_lstat (const char *path, int pri, eio_cb cb, void *data); /* stat buffer=ptr2 allocated dynamically */ +eio_req *eio_mknod (const char *path, mode_t mode, dev_t dev, int pri, eio_cb cb, void *data); +eio_req *eio_link (const char *path, const char *new_path, int pri, eio_cb cb, void *data); +eio_req *eio_symlink (const char *path, const char *new_path, int pri, eio_cb cb, void *data); +eio_req *eio_rename (const char *path, const char *new_path, int pri, eio_cb cb, void *data); +eio_req *eio_custom (eio_cb execute, int pri, eio_cb cb, void *data); +#endif -/* for groups */ -eio_req *eio_grp (eio_cb cb); +/*****************************************************************************/ +/* groups */ + +eio_req *eio_grp (eio_cb cb, void *data); void eio_grp_feed (eio_req *grp, void (*feed)(eio_req *req), int limit); void eio_grp_limit (eio_req *grp, int limit); void eio_grp_add (eio_req *grp, eio_req *req); void eio_grp_cancel (eio_req *grp); /* cancels all sub requests but not the group */ /*****************************************************************************/ -/* low-level request API */ - -/* must be used to initialise eio_req's */ -#define EIO_INIT(req,prio,finish_cb, destroy_cb) \ - memset ((req), 0, sizeof (eio_req)); \ - (req)->pri = (prio) + EIO_PRI_BIAS; \ - (req)->finish = (finish_cb); \ - (req)->destroy = (destroy_cb) +/* request api */ /* true if the request was cancelled, useful in the invoke callback */ #define EIO_CANCELLED(req) ((req)->flags & EIO_FLAG_CANCELLED) +#define EIO_RESULT(req) ((req)->result) +/* returns a pointer to the result buffer allocated by eio */ +#define EIO_BUF(req) ((req)->ptr2) +#define EIO_STAT_BUF(req) ((EIO_STRUCT_STAT *)EIO_BUF(req)) +#define EIO_PATH(req) ((char *)(req)->ptr1) + /* submit a request for execution */ void eio_submit (eio_req *req); -/* cancel a request as soon fast as possible */ +/* cancel a request as soon fast as possible, if possible */ void eio_cancel (eio_req *req); /* destroy a request that has never been submitted */ void eio_destroy (eio_req *req); +/*****************************************************************************/ +/* convinience functions */ + +ssize_t eio_sendfile_sync (int ofd, int ifd, off_t offset, size_t count); + +#ifdef __cplusplus +} +#endif + #endif