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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_COMMON |
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# define EIO_COMMON \ |
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eio_cb finish; \ |
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void (*destroy)(eio_req *req);\ |
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void *data |
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#endif |
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|
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enum { |
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EIO_QUIT, |
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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, |
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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 */ |
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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 */ |
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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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unsigned char pri; /* the priority */ |
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|
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void (*feed)(eio_req *req); |
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|
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EIO_COMMON; |
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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_PTR2_FREE = 0x02, /* 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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|
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EIO_DEFAULT_PRI = 0, |
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EIO_PRI_BIAS = -EIO_PRI_MIN, |
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EIO_NUM_PRI = EIO_PRI_MAX + EIO_PRI_BIAS + 1, |
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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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/* high-level request API */ |
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|
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eio_req *eio_fsync (int fd, eio_cb cb); |
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eio_req *eio_fdatasync (int fd, eio_cb cb); |
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eio_req *eio_dupclose (int fd, eio_cb cb); |
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eio_req *eio_readahead (int fd, off_t offset, size_t length, eio_cb cb); |
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eio_req *eio_read (int fd, off_t offs, size_t length, char *data, eio_cb cb); |
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eio_req *eio_write (int fd, off_t offs, size_t length, char *data, eio_cb cb); |
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eio_req *eio_fstat (int fd, eio_cb cb); /* stat buffer=ptr2 allocates dynamically */ |
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eio_req *eio_futime (int fd, eio_tstamp atime, eio_tstamp mtime, eio_cb cb); |
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eio_req *eio_ftruncate (int fd, off_t offset, eio_cb cb); |
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eio_req *eio_fchmod (int fd, mode_t mode, eio_cb cb); |
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eio_req *eio_fchown (int fd, uid_t uid, gid_t gid, eio_cb cb); |
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eio_req *eio_dup2 (int fd, int fd2, eio_cb cb); |
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eio_req *eio_sendfile (int out_fd, int in_fd, off_t in_offset, size_t length, eio_cb cb); |
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eio_req *eio_open (const char *path, int flags, mode_t mode, eio_cb cb); |
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eio_req *eio_readlink (const char *path, eio_cb cb); /* result=ptr2 allocated dynamically */ |
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eio_req *eio_stat (const char *path, eio_cb cb); /* stat buffer=ptr2 allocates dynamically */ |
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eio_req *eio_lstat (const char *path, eio_cb cb); /* stat buffer=ptr2 allocates dynamically */ |
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eio_req *eio_utime (const char *path, eio_tstamp atime, eio_tstamp mtime, eio_cb cb); |
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eio_req *eio_truncate (const char *path, off_t offset, eio_cb cb); |
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eio_req *eio_chmod (const char *path, mode_t mode, eio_cb cb); |
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eio_req *eio_mkdir (const char *path, mode_t mode, eio_cb cb); |
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eio_req *eio_chown (const char *path, uid_t uid, gid_t gid, eio_cb cb); |
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eio_req *eio_unlink (const char *path, eio_cb cb); |
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eio_req *eio_rmdir (const char *path, eio_cb cb); |
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eio_req *eio_readdir (const char *path, eio_cb cb); /* result=ptr2 allocated dynamically */ |
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eio_req *eio_mknod (const char *path, mode_t mode, dev_t dev, eio_cb cb); |
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eio_req *eio_busy (eio_tstamp delay, eio_cb cb); /* ties a thread for this long, simulating busyness */ |
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eio_req *eio_nop (eio_cb cb); /* does nothing except go through the whole process */ |
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|
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/* for groups */ |
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eio_req *eio_grp (eio_cb cb); |
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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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/* low-level request API */ |
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|
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/* must be used to initialise eio_req's */ |
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#define EIO_INIT(req,prio,finish_cb, destroy_cb) \ |
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memset ((req), 0, sizeof (eio_req)); \ |
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(req)->pri = (prio) + EIO_PRI_BIAS; \ |
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(req)->finish = (finish_cb); \ |
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(req)->destroy = (destroy_cb) |
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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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/* 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 */ |
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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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#endif |
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