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/* |
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* libeio API header |
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* |
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* Copyright (c) 2007,2008 Marc Alexander Lehmann <libeio@schmorp.de> |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without modifica- |
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* tion, are permitted provided that the following conditions are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright notice, |
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* this list of conditions and the following disclaimer. |
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* |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER- |
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* CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO |
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* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE- |
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* CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH- |
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* ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
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* OF THE POSSIBILITY OF SUCH DAMAGE. |
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* |
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* Alternatively, the contents of this file may be used under the terms of |
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* the GNU General Public License ("GPL") version 2 or any later version, |
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* in which case the provisions of the GPL are applicable instead of |
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* the above. If you wish to allow the use of your version of this file |
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* only under the terms of the GPL and not to allow others to use your |
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* version of this file under the BSD license, indicate your decision |
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* by deleting the provisions above and replace them with the notice |
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* and other provisions required by the GPL. If you do not delete the |
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* provisions above, a recipient may use your version of this file under |
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* either the BSD or the GPL. |
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*/ |
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|
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#ifndef EIO_H_ |
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#define EIO_H_ |
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|
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#include <stddef.h> |
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#include <sys/types.h> |
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|
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typedef struct eio_req eio_req; |
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|
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typedef int (*eio_cb)(eio_req *req); |
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|
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#ifndef EIO_REQ_MEMBERS |
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# define EIO_REQ_MEMBERS |
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#endif |
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|
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#ifndef EIO_STRUCT_STAT |
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# define EIO_STRUCT_STAT struct stat |
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#endif |
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|
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enum { |
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EIO_OPEN, EIO_CLOSE, EIO_DUP2, |
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EIO_READ, EIO_WRITE, |
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EIO_READAHEAD, EIO_SENDFILE, |
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EIO_STAT, EIO_LSTAT, EIO_FSTAT, |
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EIO_TRUNCATE, EIO_FTRUNCATE, |
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EIO_UTIME, EIO_FUTIME, |
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EIO_CHMOD, EIO_FCHMOD, |
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EIO_CHOWN, EIO_FCHOWN, |
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EIO_SYNC, EIO_FSYNC, EIO_FDATASYNC, |
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EIO_UNLINK, EIO_RMDIR, EIO_MKDIR, EIO_RENAME, |
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EIO_MKNOD, EIO_READDIR, |
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EIO_LINK, EIO_SYMLINK, EIO_READLINK, |
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EIO_GROUP, EIO_NOP, |
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EIO_BUSY, EIO_CUSTOM |
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}; |
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|
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typedef double eio_tstamp; /* feel free to use double in your code directly */ |
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|
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/* eio request structure */ |
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/* this structure is mostly read-only */ |
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struct eio_req |
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{ |
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eio_req volatile *next; /* private ETP */ |
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|
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ssize_t result; /* result of syscall, e.g. result = read (... */ |
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off_t offs; /* read, write, truncate, readahead: file offset; mknod: dev_t */ |
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size_t size; /* read, write, readahead, sendfile: length */ |
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void *ptr1; /* all applicable requests: pathname, old name */ |
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void *ptr2; /* all applicable requests: new name or memory buffer */ |
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eio_tstamp nv1; /* utime, futime: atime; busy: sleep time */ |
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eio_tstamp nv2; /* utime, futime: mtime */ |
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|
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int type; /* EIO_xxx constant ETP */ |
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int int1; /* all applicable requests: file descriptor; sendfile: output fd; open: flags */ |
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long int2; /* chown, fchown: uid; sendfile: input fd; open, chmod, mkdir, mknod: file mode */ |
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long int3; /* chown, fchown: gid */ |
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int errorno; /* errno value on syscall return */ |
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|
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unsigned char flags; /* private */ |
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signed char pri; /* the priority */ |
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|
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void *data; |
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eio_cb finish; |
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void (*destroy)(eio_req *req); /* called when requets no longer needed */ |
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void (*feed)(eio_req *req); /* only used for group requests */ |
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|
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EIO_REQ_MEMBERS |
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|
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eio_req *grp, *grp_prev, *grp_next, *grp_first; /* private */ |
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}; |
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|
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enum { |
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EIO_FLAG_CANCELLED = 0x01, /* request was cancelled */ |
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EIO_FLAG_PTR1_FREE = 0x02, /* need to free(ptr1) */ |
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EIO_FLAG_PTR2_FREE = 0x04 /* need to free(ptr2) */ |
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}; |
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|
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enum { |
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EIO_PRI_MIN = -4, |
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EIO_PRI_MAX = 4, |
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EIO_PRI_DEFAULT = 0, |
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}; |
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|
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/* returns < 0 on error, errno set |
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* need_poll, if non-zero, will be called when results are available |
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* and eio_poll_cb needs to be invoked (it MUST NOT call eio_poll_cb itself). |
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* done_poll is called when the need to poll is gone. |
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*/ |
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int eio_init (void (*want_poll)(void), void (*done_poll)(void)); |
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|
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/* must be called regularly to handle pending requests */ |
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/* returns 0 if all requests were handled, -1 if not, or the value of EIO_FINISH if != 0 */ |
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int eio_poll (void); |
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|
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/* stop polling if poll took longer than duration seconds */ |
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void eio_set_max_poll_time (eio_tstamp nseconds); |
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/* do not handle more then count requests in one call to eio_poll_cb */ |
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void eio_set_max_poll_reqs (unsigned int nreqs); |
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|
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/* set minimum required number |
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* maximum wanted number |
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* or maximum idle number of threads */ |
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void eio_set_min_parallel (unsigned int nthreads); |
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void eio_set_max_parallel (unsigned int nthreads); |
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void eio_set_max_idle (unsigned int nthreads); |
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|
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unsigned int eio_nreqs (void); /* number of requests in-flight */ |
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unsigned int eio_nready (void); /* number of not-yet handled requests */ |
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unsigned int eio_npending (void); /* numbe rof finished but unhandled requests */ |
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unsigned int eio_nthreads (void); /* number of worker threads in use currently */ |
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|
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/*****************************************************************************/ |
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/* convinience wrappers */ |
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|
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#ifndef EIO_NO_WRAPPERS |
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eio_req *eio_nop (int pri, eio_cb cb, void *data); /* does nothing except go through the whole process */ |
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eio_req *eio_busy (eio_tstamp delay, int pri, eio_cb cb, void *data); /* ties a thread for this long, simulating busyness */ |
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eio_req *eio_sync (int pri, eio_cb cb, void *data); |
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eio_req *eio_fsync (int fd, int pri, eio_cb cb, void *data); |
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eio_req *eio_fdatasync (int fd, int pri, eio_cb cb, void *data); |
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eio_req *eio_close (int fd, int pri, eio_cb cb, void *data); |
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eio_req *eio_readahead (int fd, off_t offset, size_t length, int pri, eio_cb cb, void *data); |
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eio_req *eio_read (int fd, void *buf, size_t length, off_t offset, int pri, eio_cb cb, void *data); |
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eio_req *eio_write (int fd, void *buf, size_t length, off_t offset, int pri, eio_cb cb, void *data); |
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eio_req *eio_fstat (int fd, int pri, eio_cb cb, void *data); /* stat buffer=ptr2 allocated dynamically */ |
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eio_req *eio_futime (int fd, eio_tstamp atime, eio_tstamp mtime, int pri, eio_cb cb, void *data); |
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eio_req *eio_ftruncate (int fd, off_t offset, int pri, eio_cb cb, void *data); |
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eio_req *eio_fchmod (int fd, mode_t mode, int pri, eio_cb cb, void *data); |
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eio_req *eio_fchown (int fd, uid_t uid, gid_t gid, int pri, eio_cb cb, void *data); |
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eio_req *eio_dup2 (int fd, int fd2, int pri, eio_cb cb, void *data); |
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eio_req *eio_sendfile (int out_fd, int in_fd, off_t in_offset, size_t length, int pri, eio_cb cb, void *data); |
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eio_req *eio_open (const char *path, int flags, mode_t mode, int pri, eio_cb cb, void *data); |
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eio_req *eio_utime (const char *path, eio_tstamp atime, eio_tstamp mtime, int pri, eio_cb cb, void *data); |
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eio_req *eio_truncate (const char *path, off_t offset, int pri, eio_cb cb, void *data); |
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eio_req *eio_chown (const char *path, uid_t uid, gid_t gid, int pri, eio_cb cb, void *data); |
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eio_req *eio_chmod (const char *path, mode_t mode, int pri, eio_cb cb, void *data); |
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eio_req *eio_mkdir (const char *path, mode_t mode, int pri, eio_cb cb, void *data); |
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eio_req *eio_readdir (const char *path, int pri, eio_cb cb, void *data); /* result=ptr2 allocated dynamically */ |
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eio_req *eio_rmdir (const char *path, int pri, eio_cb cb, void *data); |
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eio_req *eio_unlink (const char *path, int pri, eio_cb cb, void *data); |
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eio_req *eio_readlink (const char *path, int pri, eio_cb cb, void *data); /* result=ptr2 allocated dynamically */ |
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eio_req *eio_stat (const char *path, int pri, eio_cb cb, void *data); /* stat buffer=ptr2 allocated dynamically */ |
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eio_req *eio_lstat (const char *path, int pri, eio_cb cb, void *data); /* stat buffer=ptr2 allocated dynamically */ |
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eio_req *eio_mknod (const char *path, mode_t mode, dev_t dev, int pri, eio_cb cb, void *data); |
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eio_req *eio_link (const char *path, const char *new_path, int pri, eio_cb cb, void *data); |
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eio_req *eio_symlink (const char *path, const char *new_path, int pri, eio_cb cb, void *data); |
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eio_req *eio_rename (const char *path, const char *new_path, int pri, eio_cb cb, void *data); |
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eio_req *eio_custom (eio_cb execute, int pri, eio_cb cb, void *data); |
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#endif |
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|
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/*****************************************************************************/ |
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/* groups */ |
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|
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eio_req *eio_grp (eio_cb cb, void *data); |
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void eio_grp_feed (eio_req *grp, void (*feed)(eio_req *req), int limit); |
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void eio_grp_limit (eio_req *grp, int limit); |
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void eio_grp_add (eio_req *grp, eio_req *req); |
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void eio_grp_cancel (eio_req *grp); /* cancels all sub requests but not the group */ |
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|
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/*****************************************************************************/ |
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/* request api */ |
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|
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/* true if the request was cancelled, useful in the invoke callback */ |
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#define EIO_CANCELLED(req) ((req)->flags & EIO_FLAG_CANCELLED) |
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|
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#define EIO_RESULT(req) ((req)->result) |
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/* returns a pointer to the result buffer allocated by eio */ |
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#define EIO_BUF(req) ((req)->ptr2) |
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#define EIO_STAT_BUF(req) ((EIO_STRUCT_STAT *)EIO_BUF(req)) |
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#define EIO_PATH(req) ((char *)(req)->ptr1) |
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|
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/* submit a request for execution */ |
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void eio_submit (eio_req *req); |
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/* cancel a request as soon fast as possible, if possible */ |
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void eio_cancel (eio_req *req); |
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/* destroy a request that has never been submitted */ |
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void eio_destroy (eio_req *req); |
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|
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/*****************************************************************************/ |
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/* convinience functions */ |
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|
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ssize_t eio_sendfile_sync (int ofd, int ifd, off_t offset, size_t count); |
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|
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#endif |
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|
