libeio/eio.h

#ifndef EIO_H_
#define EIO_H_

#include <stddef.h>
#include <sys/types.h>

typedef struct eio_req eio_req;

typedef int (*eio_cb)(eio_req *req);

#ifndef EIO_COMMON
# define EIO_COMMON void *data
#endif

enum {
  EIO_QUIT,
  EIO_OPEN, EIO_CLOSE, EIO_DUP2,
  EIO_READ, EIO_WRITE,
  EIO_READAHEAD, EIO_SENDFILE,
  EIO_STAT, EIO_LSTAT, EIO_FSTAT,
  EIO_TRUNCATE, EIO_FTRUNCATE,
  EIO_UTIME, EIO_FUTIME,
  EIO_CHMOD, EIO_FCHMOD,
  EIO_CHOWN, EIO_FCHOWN,
  EIO_SYNC, EIO_FSYNC, EIO_FDATASYNC,
  EIO_UNLINK, EIO_RMDIR, EIO_MKDIR, EIO_RENAME,
  EIO_MKNOD, EIO_READDIR,
  EIO_LINK, EIO_SYMLINK, EIO_READLINK,
  EIO_GROUP, EIO_NOP,
  EIO_BUSY,
};

typedef double eio_tstamp; /* feel free to use double in your code directly */

/* eio request structure */
/* this structure is mostly read-only */
struct eio_req
{
  eio_req volatile *next; /* private */

  ssize_t result;  /* result of syscall, e.g. result = read (... */
  off_t offs;      /* read, write, truncate, readahead: file offset; mknod: dev_t */
  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 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 */
  int errorno;     /* errno value on syscall return */

  unsigned char flags; /* private */
  unsigned char pri; /* the priority */

  eio_cb finish;
  void (*destroy)(eio_req *req);
  void (*feed)(eio_req *req);

  EIO_COMMON;

  eio_req *grp, *grp_prev, *grp_next, *grp_first; /* private */
};

enum {
  EIO_FLAG_CANCELLED = 0x01, /* request was cancelled */
  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
};

/* returns < 0 on error, errno set
 * need_poll, if non-zero, will be called when results are available
 * and eio_poll_cb needs to be invoked (it MUST NOT call eio_poll_cb itself).
 * done_poll is called when the need to poll is gone.
 */
int eio_init (void (*want_poll)(void), void (*done_poll)(void));

/* must be called regularly to handle pending requests */
/* returns 0 if all requests were handled, -1 if not, or the value of EIO_FINISH if != 0 */
int eio_poll (void);

/* stop polling if poll took longer than duration seconds */
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);

/* set minimum required number
 * maximum wanted number
 * or maximum idle number of threads */
void eio_set_min_parallel (unsigned int nthreads);
void eio_set_max_parallel (unsigned int nthreads);
void eio_set_max_idle     (unsigned int nthreads);

unsigned int eio_nreqs    (void); /* number of requests in-flight */
unsigned int eio_nready   (void); /* number of not-yet handled requests */
unsigned int eio_npending (void); /* numbe rof finished but unhandled requests */
unsigned int eio_nthreads (void); /* number of worker threads in use currently */

/*****************************************************************************/
/* high-level request API */

eio_req *eio_fsync     (int fd, eio_cb cb);
eio_req *eio_fdatasync (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 offset, size_t length, void *data, eio_cb cb);
eio_req *eio_write     (int fd, off_t offset, size_t length, void *data, eio_cb cb);
eio_req *eio_fstat     (int fd, eio_cb cb); /* stat buffer=ptr2 allocated 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 allocated dynamically */
eio_req *eio_lstat     (const char *path, eio_cb cb); /* stat buffer=ptr2 allocated 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_chown     (const char *path, uid_t uid, gid_t gid, 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_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 */

/* for groups */
eio_req *eio_grp       (eio_cb cb);
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)

/* true if the request was cancelled, useful in the invoke callback */
#define EIO_CANCELLED(req) ((req)->flags & EIO_FLAG_CANCELLED)

/* submit a request for execution */
void eio_submit (eio_req *req);
/* cancel a request as soon fast as 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 (int ofd, int ifd, off_t offset, size_t count)*/

#endif

Revision:	1.5
Committed:	Sun May 11 19:11:05 2008 UTC (16 years ago) by root
Content type:	text/plain
Branch:	MAIN
Changes since 1.4:	+17 -13 lines
Log Message:	implement high-level eio functions (untested), bugfixes
#	Content
1	#ifndef EIO_H_
2	#define EIO_H_
3
4	#include <stddef.h>
5	#include <sys/types.h>
6
7	typedef struct eio_req eio_req;
8
9	typedef int (eio_cb)(eio_req req);
10
11	#ifndef EIO_COMMON
12	# define EIO_COMMON void *data
13	#endif
14
15	enum {
16	EIO_QUIT,
17	EIO_OPEN, EIO_CLOSE, EIO_DUP2,
18	EIO_READ, EIO_WRITE,
19	EIO_READAHEAD, EIO_SENDFILE,
20	EIO_STAT, EIO_LSTAT, EIO_FSTAT,
21	EIO_TRUNCATE, EIO_FTRUNCATE,
22	EIO_UTIME, EIO_FUTIME,
23	EIO_CHMOD, EIO_FCHMOD,
24	EIO_CHOWN, EIO_FCHOWN,
25	EIO_SYNC, EIO_FSYNC, EIO_FDATASYNC,
26	EIO_UNLINK, EIO_RMDIR, EIO_MKDIR, EIO_RENAME,
27	EIO_MKNOD, EIO_READDIR,
28	EIO_LINK, EIO_SYMLINK, EIO_READLINK,
29	EIO_GROUP, EIO_NOP,
30	EIO_BUSY,
31	};
32
33	typedef double eio_tstamp; /* feel free to use double in your code directly */
34
35	/* eio request structure */
36	/* this structure is mostly read-only */
37	struct eio_req
38	{
39	eio_req volatile next; / private */
40
41	ssize_t result; /* result of syscall, e.g. result = read (... */
42	off_t offs; /* read, write, truncate, readahead: file offset; mknod: dev_t */
43	size_t size; /* read, write, readahead, sendfile: length */
44	void ptr1; / all applicable requests: pathname, old name */
45	void ptr2; / all applicable requests: new name or memory buffer */
46	eio_tstamp nv1; /* utime, futime: atime; busy: sleep time */
47	eio_tstamp nv2; /* utime, futime: mtime */
48
49	int type; /* EIO_xxx constant */
50	int int1; /* all applicable requests: file descriptor; sendfile: output fd; open: flags */
51	long int2; /* chown, fchown: uid; sendfile: input fd; open, chmod, mkdir, mknod: file mode */
52	long int3; /* chown, fchown: gid */
53	int errorno; /* errno value on syscall return */
54
55	unsigned char flags; /* private */
56	unsigned char pri; /* the priority */
57
58	eio_cb finish;
59	void (destroy)(eio_req req);
60	void (feed)(eio_req req);
61
62	EIO_COMMON;
63
64	eio_req grp, grp_prev, grp_next, grp_first; /* private */
65	};
66
67	enum {
68	EIO_FLAG_CANCELLED = 0x01, /* request was cancelled */
69	EIO_FLAG_PTR1_FREE = 0x02, /* need to free(ptr1) */
70	EIO_FLAG_PTR2_FREE = 0x04 /* need to free(ptr2) */
71	};
72
73	enum {
74	EIO_PRI_MIN = -4,
75	EIO_PRI_MAX = 4,
76
77	EIO_DEFAULT_PRI = 0,
78	EIO_PRI_BIAS = -EIO_PRI_MIN,
79	EIO_NUM_PRI = EIO_PRI_MAX + EIO_PRI_BIAS + 1
80	};
81
82	/* returns < 0 on error, errno set
83	* 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).
85	* done_poll is called when the need to poll is gone.
86	*/
87	int eio_init (void (want_poll)(void), void (done_poll)(void));
88
89	/* must be called regularly to handle pending requests */
90	/* returns 0 if all requests were handled, -1 if not, or the value of EIO_FINISH if != 0 */
91	int eio_poll (void);
92
93	/* stop polling if poll took longer than duration seconds */
94	void eio_set_max_poll_time (eio_tstamp nseconds);
95	/* do not handle more then count requests in one call to eio_poll_cb */
96	void eio_set_max_poll_reqs (unsigned int nreqs);
97
98	/* set minimum required number
99	* maximum wanted number
100	* or maximum idle number of threads */
101	void eio_set_min_parallel (unsigned int nthreads);
102	void eio_set_max_parallel (unsigned int nthreads);
103	void eio_set_max_idle (unsigned int nthreads);
104
105	unsigned int eio_nreqs (void); /* number of requests in-flight */
106	unsigned int eio_nready (void); /* number of not-yet handled requests */
107	unsigned int eio_npending (void); /* numbe rof finished but unhandled requests */
108	unsigned int eio_nthreads (void); /* number of worker threads in use currently */
109
110	/*****************************************************************************/
111	/* high-level request API */
112
113	eio_req *eio_fsync (int fd, eio_cb cb);
114	eio_req *eio_fdatasync (int fd, eio_cb cb);
115	eio_req *eio_readahead (int fd, off_t offset, size_t length, eio_cb cb);
116	eio_req eio_read (int fd, off_t offset, size_t length, void data, eio_cb cb);
117	eio_req eio_write (int fd, off_t offset, size_t length, void data, eio_cb cb);
118	eio_req eio_fstat (int fd, eio_cb cb); / stat buffer=ptr2 allocated dynamically */
119	eio_req *eio_futime (int fd, eio_tstamp atime, eio_tstamp mtime, eio_cb cb);
120	eio_req *eio_ftruncate (int fd, off_t offset, eio_cb cb);
121	eio_req *eio_fchmod (int fd, mode_t mode, eio_cb cb);
122	eio_req *eio_fchown (int fd, uid_t uid, gid_t gid, eio_cb cb);
123	eio_req *eio_dup2 (int fd, int fd2, eio_cb cb);
124	eio_req *eio_sendfile (int out_fd, int in_fd, off_t in_offset, size_t length, eio_cb cb);
125	eio_req eio_open (const char path, int flags, mode_t mode, eio_cb cb);
126	eio_req eio_readlink (const char path, eio_cb cb); /* result=ptr2 allocated dynamically */
127	eio_req eio_stat (const char path, eio_cb cb); /* stat buffer=ptr2 allocated dynamically */
128	eio_req eio_lstat (const char path, eio_cb cb); /* stat buffer=ptr2 allocated dynamically */
129	eio_req eio_utime (const char path, eio_tstamp atime, eio_tstamp mtime, eio_cb cb);
130	eio_req eio_truncate (const char path, off_t offset, eio_cb cb);
131	eio_req eio_chown (const char path, uid_t uid, gid_t gid, eio_cb cb);
132	eio_req eio_chmod (const char path, mode_t mode, eio_cb cb);
133	eio_req eio_mkdir (const char path, mode_t mode, eio_cb cb);
134	eio_req eio_unlink (const char path, eio_cb cb);
135	eio_req eio_rmdir (const char path, eio_cb cb);
136	eio_req eio_readdir (const char path, eio_cb cb); /* result=ptr2 allocated dynamically */
137	eio_req eio_mknod (const char path, mode_t mode, dev_t dev, eio_cb cb);
138	eio_req eio_busy (eio_tstamp delay, eio_cb cb); / ties a thread for this long, simulating busyness */
139	eio_req eio_nop (eio_cb cb); / does nothing except go through the whole process */
140
141	/* for groups */
142	eio_req *eio_grp (eio_cb cb);
143	void eio_grp_feed (eio_req grp, void (feed)(eio_req *req), int limit);
144	void eio_grp_limit (eio_req *grp, int limit);
145	void eio_grp_add (eio_req grp, eio_req req);
146	void eio_grp_cancel (eio_req grp); / cancels all sub requests but not the group */
147
148	/*****************************************************************************/
149	/* low-level request API */
150
151	/* must be used to initialise eio_req's */
152	#define EIO_INIT(req,prio,finish_cb, destroy_cb) \
153	memset ((req), 0, sizeof (eio_req)); \
154	(req)->pri = (prio) + EIO_PRI_BIAS; \
155	(req)->finish = (finish_cb); \
156	(req)->destroy = (destroy_cb)
157
158	/* true if the request was cancelled, useful in the invoke callback */
159	#define EIO_CANCELLED(req) ((req)->flags & EIO_FLAG_CANCELLED)
160
161	/* submit a request for execution */
162	void eio_submit (eio_req *req);
163	/* cancel a request as soon fast as possible */
164	void eio_cancel (eio_req *req);
165	/* destroy a request that has never been submitted */
166	void eio_destroy (eio_req *req);
167
168	/*****************************************************************************/
169	/* convinience functions */
170
171	/ssize_t eio_sendfile (int ofd, int ifd, off_t offset, size_t count)/
172
173	#endif
174