libeio/eio.h

/*
 * libeio API header
 *
 * Copyright (c) 2007,2008,2009,2010,2011 Marc Alexander Lehmann <libeio@schmorp.de>
 * 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 <stddef.h>
#include <signal.h>
#include <sys/types.h>

typedef struct eio_req    eio_req;
typedef struct eio_dirent eio_dirent;

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

#ifndef EIO_REQ_MEMBERS
# define EIO_REQ_MEMBERS
#endif

#ifndef EIO_STRUCT_STAT
# ifdef _WIN32
#  define EIO_STRUCT_STAT struct _stati64
#  define EIO_STRUCT_STATI64
# else
#  define EIO_STRUCT_STAT struct stat
# endif
#endif

#ifdef _WIN32
  typedef int      eio_uid_t;
  typedef int      eio_gid_t;
  typedef intptr_t eio_ssize_t; /* or SSIZE_T */
  #if __GNUC__
    typedef long long eio_ino_t;
  #else
    typedef __int64   eio_ino_t; /* unsigned not supported by msvc */
  #endif
#else
  typedef uid_t    eio_uid_t;
  typedef gid_t    eio_gid_t;
  typedef ssize_t  eio_ssize_t;
  typedef ino_t    eio_ino_t;
#endif

#ifndef EIO_STRUCT_STATVFS
# define EIO_STRUCT_STATVFS struct statvfs
#endif

/* for readdir */

/* eio_readdir flags */
enum
{
  EIO_READDIR_DENTS         = 0x01, /* ptr2 contains eio_dirents, not just the (unsorted) names */
  EIO_READDIR_DIRS_FIRST    = 0x02, /* dirents gets sorted into a good stat() ing order to find directories first */
  EIO_READDIR_STAT_ORDER    = 0x04, /* dirents gets sorted into a good stat() ing order to quickly stat all files */
  EIO_READDIR_FOUND_UNKNOWN = 0x80, /* set by eio_readdir when *_ARRAY was set and any TYPE=UNKNOWN's were found */

  EIO_READDIR_CUSTOM1       = 0x100, /* for use by apps */
  EIO_READDIR_CUSTOM2       = 0x200  /* for use by apps */
};

/* using "typical" values in the hope that the compiler will do something sensible */
enum eio_dtype
{
  EIO_DT_UNKNOWN =  0,
  EIO_DT_FIFO    =  1,
  EIO_DT_CHR     =  2,
  EIO_DT_MPC     =  3, /* multiplexed char device (v7+coherent) */
  EIO_DT_DIR     =  4,
  EIO_DT_NAM     =  5, /* xenix special named file */
  EIO_DT_BLK     =  6,
  EIO_DT_MPB     =  7, /* multiplexed block device (v7+coherent) */
  EIO_DT_REG     =  8,
  EIO_DT_NWK     =  9, /* HP-UX network special */
  EIO_DT_CMP     =  9, /* VxFS compressed */
  EIO_DT_LNK     = 10,
  /*  DT_SHAD    = 11,*/
  EIO_DT_SOCK    = 12,
  EIO_DT_DOOR    = 13, /* solaris door */
  EIO_DT_WHT     = 14,
  EIO_DT_MAX     = 15  /* highest DT_VALUE ever, hopefully */
};

struct eio_dirent
{
  int nameofs; /* offset of null-terminated name string in (char *)req->ptr2 */
  unsigned short namelen; /* size of filename without trailing 0 */
  unsigned char type; /* one of EIO_DT_* */
  signed char score; /* internal use */
  eio_ino_t inode; /* the inode number, if available, otherwise unspecified */
};

/* eio_msync flags */
enum
{
  EIO_MS_ASYNC      = 1,
  EIO_MS_INVALIDATE = 2,
  EIO_MS_SYNC       = 4
};

/* eio_mtouch flags */
enum
{
  EIO_MT_MODIFY     = 1
};

/* eio_sync_file_range flags */
enum
{
  EIO_SYNC_FILE_RANGE_WAIT_BEFORE = 1,
  EIO_SYNC_FILE_RANGE_WRITE       = 2,
  EIO_SYNC_FILE_RANGE_WAIT_AFTER  = 4
};

/* eio_fallocate flags */
enum
{
  EIO_FALLOC_FL_KEEP_SIZE = 1 /* MUST match the value in linux/falloc.h */
};

/* timestamps and differences - feel free to use double in your code directly */
typedef double eio_tstamp;

/* the eio request structure */
enum
{
  EIO_CUSTOM,
  EIO_OPEN, EIO_CLOSE, EIO_DUP2,
  EIO_READ, EIO_WRITE,
  EIO_READAHEAD, EIO_SENDFILE,
  EIO_STAT, EIO_LSTAT, EIO_FSTAT,
  EIO_STATVFS, EIO_FSTATVFS,
  EIO_TRUNCATE, EIO_FTRUNCATE,
  EIO_UTIME, EIO_FUTIME,
  EIO_CHMOD, EIO_FCHMOD,
  EIO_CHOWN, EIO_FCHOWN,
  EIO_SYNC, EIO_FSYNC, EIO_FDATASYNC,
  EIO_MSYNC, EIO_MTOUCH, EIO_SYNC_FILE_RANGE, EIO_FALLOCATE,
  EIO_MLOCK, EIO_MLOCKALL,
  EIO_UNLINK, EIO_RMDIR, EIO_MKDIR, EIO_RENAME,
  EIO_MKNOD, EIO_READDIR,
  EIO_LINK, EIO_SYMLINK, EIO_READLINK, EIO_REALPATH,
  EIO_GROUP, EIO_NOP,
  EIO_BUSY
};

/* mlockall constants */
enum
{
  EIO_MCL_CURRENT = 1,
  EIO_MCL_FUTURE  = 2,
};

/* request priorities */

enum {
  EIO_PRI_MIN     = -4,
  EIO_PRI_MAX     =  4,
  EIO_PRI_DEFAULT =  0,
};

/* eio request structure */
/* this structure is mostly read-only */
/* when initialising it, all members must be zero-initialised */
struct eio_req
{
  eio_req volatile *next; /* private ETP */

  eio_ssize_t result;  /* result of syscall, e.g. result = read (... */
  off_t offs;      /* read, write, truncate, readahead, sync_file_range, fallocate: file offset, mknod: dev_t */
  size_t size;     /* read, write, readahead, sendfile, msync, mlock, sync_file_range, fallocate: length */
  void *ptr1;      /* all applicable requests: pathname, old name; readdir: optional eio_dirents */
  void *ptr2;      /* all applicable requests: new name or memory buffer; readdir: name strings */
  eio_tstamp nv1;  /* utime, futime: atime; busy: sleep time */
  eio_tstamp nv2;  /* utime, futime: mtime */

  int type;        /* EIO_xxx constant ETP */
  int int1;        /* all applicable requests: file descriptor; sendfile: output fd; open, msync, mlockall, readdir: flags */
  long int2;       /* chown, fchown: uid; sendfile: input fd; open, chmod, mkdir, mknod: file mode, sync_file_range, fallocate: flags */
  long int3;       /* chown, fchown: gid */
  int errorno;     /* errno value on syscall return */

#if __i386 || __amd64
  unsigned char cancelled;
#else
  sig_atomic_t cancelled;
#endif

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

  void *data;
  eio_cb finish;
  void (*destroy)(eio_req *req); /* called when request no longer needed */
  void (*feed)(eio_req *req);    /* only used for group requests */

  EIO_REQ_MEMBERS

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

/* _private_ request flags */
enum {
  EIO_FLAG_PTR1_FREE = 0x01, /* need to free(ptr1) */
  EIO_FLAG_PTR2_FREE = 0x02, /* need to free(ptr2) */
  EIO_FLAG_GROUPADD  = 0x04  /* some request was added to the group */
};

/* undocumented/unsupported/private helper */
/*void eio_page_align (void **addr, size_t *length);*/

/* 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);
void eio_set_idle_timeout (unsigned int seconds);

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); /* number of finished but unhandled requests */
unsigned int eio_nthreads (void); /* number of worker threads in use currently */

/*****************************************************************************/
/* convenience wrappers */

#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_msync     (void *addr, size_t length, int flags, int pri, eio_cb cb, void *data);
eio_req *eio_mtouch    (void *addr, size_t length, int flags, int pri, eio_cb cb, void *data);
eio_req *eio_mlock     (void *addr, size_t length, int pri, eio_cb cb, void *data);
eio_req *eio_mlockall  (int flags, int pri, eio_cb cb, void *data);
eio_req *eio_sync_file_range (int fd, off_t offset, size_t nbytes, unsigned int flags, int pri, eio_cb cb, void *data);
eio_req *eio_fallocate (int fd, int mode, off_t offset, size_t len, 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_fstatvfs  (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 flags, 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_realpath  (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_statvfs   (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    (void (*execute)(eio_req *), int pri, eio_cb cb, void *data);
#endif

/*****************************************************************************/
/* 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 */

/*****************************************************************************/
/* request api */

/* true if the request was cancelled, useful in the invoke callback */
#define EIO_CANCELLED(req)   ((req)->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_STATVFS_BUF(req) ((EIO_STRUCT_STATVFS *)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, if possible */
void eio_cancel (eio_req *req);

/*****************************************************************************/
/* convenience functions */

eio_ssize_t eio_sendfile_sync (int ofd, int ifd, off_t offset, size_t count);

#ifdef __cplusplus
}
#endif

#endif

Revision:	1.40
Committed:	Sun Jul 17 04:20:04 2011 UTC (12 years, 10 months ago) by root
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rel-4_0
Changes since 1.39:	+13 -7 lines
Log Message:	initial windows support
#	User	Rev	Content
1	root	1.12	/*
2			* libeio API header
3			*
4	root	1.28	* Copyright (c) 2007,2008,2009,2010,2011 Marc Alexander Lehmann <libeio@schmorp.de>
5	root	1.12	* All rights reserved.
6			*
7			* Redistribution and use in source and binary forms, with or without modifica-
8			* tion, are permitted provided that the following conditions are met:
9			*
10			* 1. Redistributions of source code must retain the above copyright notice,
11			* this list of conditions and the following disclaimer.
12			*
13			* 2. Redistributions in binary form must reproduce the above copyright
14			* notice, this list of conditions and the following disclaimer in the
15			* documentation and/or other materials provided with the distribution.
16			*
17			* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
18			* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
19			* CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
20			* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
21			* CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
22			* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
23			* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
24			* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
25			* ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
26			* OF THE POSSIBILITY OF SUCH DAMAGE.
27			*
28			* Alternatively, the contents of this file may be used under the terms of
29			* the GNU General Public License ("GPL") version 2 or any later version,
30			* in which case the provisions of the GPL are applicable instead of
31			* the above. If you wish to allow the use of your version of this file
32			* only under the terms of the GPL and not to allow others to use your
33			* version of this file under the BSD license, indicate your decision
34			* by deleting the provisions above and replace them with the notice
35			* and other provisions required by the GPL. If you do not delete the
36			* provisions above, a recipient may use your version of this file under
37			* either the BSD or the GPL.
38			*/
39
40	root	1.1	#ifndef EIO_H_
41			#define EIO_H_
42
43	root	1.14	#ifdef __cplusplus
44			extern "C" {
45			#endif
46
47	root	1.1	#include <stddef.h>
48	root	1.35	#include <signal.h>
49	root	1.3	#include <sys/types.h>
50	root	1.1
51	root	1.19	typedef struct eio_req eio_req;
52			typedef struct eio_dirent eio_dirent;
53	root	1.1
54			typedef int (eio_cb)(eio_req req);
55
56	root	1.9	#ifndef EIO_REQ_MEMBERS
57			# define EIO_REQ_MEMBERS
58	root	1.1	#endif
59
60	root	1.6	#ifndef EIO_STRUCT_STAT
61	root	1.38	# ifdef _WIN32
62			# define EIO_STRUCT_STAT struct _stati64
63			# define EIO_STRUCT_STATI64
64			# else
65			# define EIO_STRUCT_STAT struct stat
66			# endif
67	root	1.6	#endif
68
69	root	1.39	#ifdef _WIN32
70	root	1.40	typedef int eio_uid_t;
71			typedef int eio_gid_t;
72			typedef intptr_t eio_ssize_t; /* or SSIZE_T */
73			#if __GNUC__
74			typedef long long eio_ino_t;
75			#else
76			typedef __int64 eio_ino_t; /* unsigned not supported by msvc */
77			#endif
78	root	1.39	#else
79	root	1.40	typedef uid_t eio_uid_t;
80			typedef gid_t eio_gid_t;
81			typedef ssize_t eio_ssize_t;
82			typedef ino_t eio_ino_t;
83	root	1.39	#endif
84
85	root	1.26	#ifndef EIO_STRUCT_STATVFS
86			# define EIO_STRUCT_STATVFS struct statvfs
87			#endif
88
89	root	1.19	/* for readdir */
90
91			/* eio_readdir flags */
92	root	1.27	enum
93			{
94	root	1.19	EIO_READDIR_DENTS = 0x01, /* ptr2 contains eio_dirents, not just the (unsorted) names */
95			EIO_READDIR_DIRS_FIRST = 0x02, /* dirents gets sorted into a good stat() ing order to find directories first */
96			EIO_READDIR_STAT_ORDER = 0x04, /* dirents gets sorted into a good stat() ing order to quickly stat all files */
97			EIO_READDIR_FOUND_UNKNOWN = 0x80, /* set by eio_readdir when _ARRAY was set and any TYPE=UNKNOWN's were found /
98
99			EIO_READDIR_CUSTOM1 = 0x100, /* for use by apps */
100			EIO_READDIR_CUSTOM2 = 0x200 /* for use by apps */
101			};
102
103			/* using "typical" values in the hope that the compiler will do something sensible */
104	root	1.27	enum eio_dtype
105			{
106	root	1.19	EIO_DT_UNKNOWN = 0,
107			EIO_DT_FIFO = 1,
108			EIO_DT_CHR = 2,
109	root	1.22	EIO_DT_MPC = 3, /* multiplexed char device (v7+coherent) */
110	root	1.19	EIO_DT_DIR = 4,
111	root	1.21	EIO_DT_NAM = 5, /* xenix special named file */
112	root	1.19	EIO_DT_BLK = 6,
113	root	1.21	EIO_DT_MPB = 7, /* multiplexed block device (v7+coherent) */
114	root	1.19	EIO_DT_REG = 8,
115	root	1.21	EIO_DT_NWK = 9, /* HP-UX network special */
116			EIO_DT_CMP = 9, /* VxFS compressed */
117	root	1.19	EIO_DT_LNK = 10,
118	root	1.21	/* DT_SHAD = 11,*/
119	root	1.19	EIO_DT_SOCK = 12,
120	root	1.21	EIO_DT_DOOR = 13, /* solaris door */
121	root	1.19	EIO_DT_WHT = 14,
122	root	1.22	EIO_DT_MAX = 15 /* highest DT_VALUE ever, hopefully */
123	root	1.19	};
124
125	root	1.27	struct eio_dirent
126			{
127	root	1.24	int nameofs; /* offset of null-terminated name string in (char )req->ptr2 /
128			unsigned short namelen; /* size of filename without trailing 0 */
129			unsigned char type; /* one of EIO_DT_* */
130	root	1.23	signed char score; /* internal use */
131	root	1.40	eio_ino_t inode; /* the inode number, if available, otherwise unspecified */
132	root	1.19	};
133
134	root	1.25	/* eio_msync flags */
135	root	1.27	enum
136			{
137	root	1.25	EIO_MS_ASYNC = 1,
138			EIO_MS_INVALIDATE = 2,
139			EIO_MS_SYNC = 4
140			};
141
142			/* eio_mtouch flags */
143	root	1.27	enum
144			{
145	root	1.25	EIO_MT_MODIFY = 1
146			};
147
148	root	1.19	/* eio_sync_file_range flags */
149	root	1.27	enum
150			{
151	root	1.19	EIO_SYNC_FILE_RANGE_WAIT_BEFORE = 1,
152			EIO_SYNC_FILE_RANGE_WRITE = 2,
153			EIO_SYNC_FILE_RANGE_WAIT_AFTER = 4
154			};
155
156	root	1.37	/* eio_fallocate flags */
157			enum
158			{
159			EIO_FALLOC_FL_KEEP_SIZE = 1 /* MUST match the value in linux/falloc.h */
160			};
161
162			/* timestamps and differences - feel free to use double in your code directly */
163			typedef double eio_tstamp;
164	root	1.19
165			/* the eio request structure */
166	root	1.27	enum
167			{
168	root	1.16	EIO_CUSTOM,
169	root	1.1	EIO_OPEN, EIO_CLOSE, EIO_DUP2,
170			EIO_READ, EIO_WRITE,
171			EIO_READAHEAD, EIO_SENDFILE,
172			EIO_STAT, EIO_LSTAT, EIO_FSTAT,
173	root	1.26	EIO_STATVFS, EIO_FSTATVFS,
174	root	1.1	EIO_TRUNCATE, EIO_FTRUNCATE,
175			EIO_UTIME, EIO_FUTIME,
176			EIO_CHMOD, EIO_FCHMOD,
177			EIO_CHOWN, EIO_FCHOWN,
178	root	1.18	EIO_SYNC, EIO_FSYNC, EIO_FDATASYNC,
179	root	1.37	EIO_MSYNC, EIO_MTOUCH, EIO_SYNC_FILE_RANGE, EIO_FALLOCATE,
180	root	1.27	EIO_MLOCK, EIO_MLOCKALL,
181	root	1.1	EIO_UNLINK, EIO_RMDIR, EIO_MKDIR, EIO_RENAME,
182			EIO_MKNOD, EIO_READDIR,
183	root	1.33	EIO_LINK, EIO_SYMLINK, EIO_READLINK, EIO_REALPATH,
184	root	1.1	EIO_GROUP, EIO_NOP,
185	root	1.18	EIO_BUSY
186			};
187
188	root	1.27	/* mlockall constants */
189			enum
190			{
191			EIO_MCL_CURRENT = 1,
192			EIO_MCL_FUTURE = 2,
193			};
194
195			/* request priorities */
196
197			enum {
198			EIO_PRI_MIN = -4,
199			EIO_PRI_MAX = 4,
200			EIO_PRI_DEFAULT = 0,
201			};
202
203	root	1.1	/* eio request structure */
204			/* this structure is mostly read-only */
205	root	1.19	/* when initialising it, all members must be zero-initialised */
206	root	1.1	struct eio_req
207			{
208	root	1.12	eio_req volatile next; / private ETP */
209	root	1.1
210	root	1.39	eio_ssize_t result; /* result of syscall, e.g. result = read (... */
211	root	1.37	off_t offs; /* read, write, truncate, readahead, sync_file_range, fallocate: file offset, mknod: dev_t */
212			size_t size; /* read, write, readahead, sendfile, msync, mlock, sync_file_range, fallocate: length */
213	root	1.24	void ptr1; / all applicable requests: pathname, old name; readdir: optional eio_dirents */
214			void ptr2; / all applicable requests: new name or memory buffer; readdir: name strings */
215	root	1.2	eio_tstamp nv1; /* utime, futime: atime; busy: sleep time */
216			eio_tstamp nv2; /* utime, futime: mtime */
217	root	1.1
218	root	1.12	int type; /* EIO_xxx constant ETP */
219	root	1.27	int int1; /* all applicable requests: file descriptor; sendfile: output fd; open, msync, mlockall, readdir: flags */
220	root	1.37	long int2; /* chown, fchown: uid; sendfile: input fd; open, chmod, mkdir, mknod: file mode, sync_file_range, fallocate: flags */
221	root	1.28	long int3; /* chown, fchown: gid */
222	root	1.1	int errorno; /* errno value on syscall return */
223
224	root	1.35	#if __i386 \|\| __amd64
225			unsigned char cancelled;
226			#else
227			sig_atomic_t cancelled;
228			#endif
229
230	root	1.1	unsigned char flags; /* private */
231	root	1.8	signed char pri; /* the priority */
232	root	1.1
233	root	1.8	void *data;
234	root	1.5	eio_cb finish;
235	root	1.30	void (destroy)(eio_req req); /* called when request no longer needed */
236	root	1.8	void (feed)(eio_req req); /* only used for group requests */
237	root	1.1
238	root	1.8	EIO_REQ_MEMBERS
239	root	1.1
240			eio_req grp, grp_prev, grp_next, grp_first; /* private */
241			};
242
243	root	1.27	/* _private_ request flags */
244	root	1.1	enum {
245	root	1.35	EIO_FLAG_PTR1_FREE = 0x01, /* need to free(ptr1) */
246			EIO_FLAG_PTR2_FREE = 0x02, /* need to free(ptr2) */
247			EIO_FLAG_GROUPADD = 0x04 /* some request was added to the group */
248	root	1.1	};
249
250	root	1.27	/* undocumented/unsupported/private helper */
251			/void eio_page_align (void addr, size_t length);*/
252	root	1.1
253			/* returns < 0 on error, errno set
254			* need_poll, if non-zero, will be called when results are available
255			* and eio_poll_cb needs to be invoked (it MUST NOT call eio_poll_cb itself).
256			* done_poll is called when the need to poll is gone.
257			*/
258			int eio_init (void (want_poll)(void), void (done_poll)(void));
259
260			/* must be called regularly to handle pending requests */
261			/* returns 0 if all requests were handled, -1 if not, or the value of EIO_FINISH if != 0 */
262			int eio_poll (void);
263
264			/* stop polling if poll took longer than duration seconds */
265			void eio_set_max_poll_time (eio_tstamp nseconds);
266			/* do not handle more then count requests in one call to eio_poll_cb */
267			void eio_set_max_poll_reqs (unsigned int nreqs);
268
269			/* set minimum required number
270			* maximum wanted number
271			* or maximum idle number of threads */
272			void eio_set_min_parallel (unsigned int nthreads);
273			void eio_set_max_parallel (unsigned int nthreads);
274			void eio_set_max_idle (unsigned int nthreads);
275	root	1.29	void eio_set_idle_timeout (unsigned int seconds);
276	root	1.1
277			unsigned int eio_nreqs (void); /* number of requests in-flight */
278			unsigned int eio_nready (void); /* number of not-yet handled requests */
279	sf-exg	1.36	unsigned int eio_npending (void); /* number of finished but unhandled requests */
280	root	1.1	unsigned int eio_nthreads (void); /* number of worker threads in use currently */
281
282			/*****************************************************************************/
283	root	1.31	/* convenience wrappers */
284	root	1.1
285	root	1.10	#ifndef EIO_NO_WRAPPERS
286	root	1.7	eio_req eio_nop (int pri, eio_cb cb, void data); /* does nothing except go through the whole process */
287			eio_req eio_busy (eio_tstamp delay, int pri, eio_cb cb, void data); /* ties a thread for this long, simulating busyness */
288			eio_req eio_sync (int pri, eio_cb cb, void data);
289			eio_req eio_fsync (int fd, int pri, eio_cb cb, void data);
290			eio_req eio_fdatasync (int fd, int pri, eio_cb cb, void data);
291	root	1.16	eio_req eio_msync (void addr, size_t length, int flags, int pri, eio_cb cb, void *data);
292			eio_req eio_mtouch (void addr, size_t length, int flags, int pri, eio_cb cb, void *data);
293	root	1.27	eio_req eio_mlock (void addr, size_t length, int pri, eio_cb cb, void *data);
294			eio_req eio_mlockall (int flags, int pri, eio_cb cb, void data);
295	root	1.18	eio_req eio_sync_file_range (int fd, off_t offset, size_t nbytes, unsigned int flags, int pri, eio_cb cb, void data);
296	root	1.37	eio_req eio_fallocate (int fd, int mode, off_t offset, size_t len, int pri, eio_cb cb, void data);
297	root	1.7	eio_req eio_close (int fd, int pri, eio_cb cb, void data);
298			eio_req eio_readahead (int fd, off_t offset, size_t length, int pri, eio_cb cb, void data);
299			eio_req eio_read (int fd, void buf, size_t length, off_t offset, int pri, eio_cb cb, void *data);
300			eio_req eio_write (int fd, void buf, size_t length, off_t offset, int pri, eio_cb cb, void *data);
301			eio_req eio_fstat (int fd, int pri, eio_cb cb, void data); /* stat buffer=ptr2 allocated dynamically */
302	root	1.26	eio_req eio_fstatvfs (int fd, int pri, eio_cb cb, void data); /* stat buffer=ptr2 allocated dynamically */
303	root	1.7	eio_req eio_futime (int fd, eio_tstamp atime, eio_tstamp mtime, int pri, eio_cb cb, void data);
304			eio_req eio_ftruncate (int fd, off_t offset, int pri, eio_cb cb, void data);
305			eio_req eio_fchmod (int fd, mode_t mode, int pri, eio_cb cb, void data);
306			eio_req eio_fchown (int fd, uid_t uid, gid_t gid, int pri, eio_cb cb, void data);
307			eio_req eio_dup2 (int fd, int fd2, int pri, eio_cb cb, void data);
308			eio_req eio_sendfile (int out_fd, int in_fd, off_t in_offset, size_t length, int pri, eio_cb cb, void data);
309			eio_req eio_open (const char path, int flags, mode_t mode, int pri, eio_cb cb, void *data);
310			eio_req eio_utime (const char path, eio_tstamp atime, eio_tstamp mtime, int pri, eio_cb cb, void *data);
311			eio_req eio_truncate (const char path, off_t offset, int pri, eio_cb cb, void *data);
312			eio_req eio_chown (const char path, uid_t uid, gid_t gid, int pri, eio_cb cb, void *data);
313			eio_req eio_chmod (const char path, mode_t mode, int pri, eio_cb cb, void *data);
314			eio_req eio_mkdir (const char path, mode_t mode, int pri, eio_cb cb, void *data);
315	root	1.19	eio_req eio_readdir (const char path, int flags, int pri, eio_cb cb, void data); / result=ptr2 allocated dynamically */
316	root	1.7	eio_req eio_rmdir (const char path, int pri, eio_cb cb, void *data);
317			eio_req eio_unlink (const char path, int pri, eio_cb cb, void *data);
318			eio_req eio_readlink (const char path, int pri, eio_cb cb, void data); / result=ptr2 allocated dynamically */
319	root	1.33	eio_req eio_realpath (const char path, int pri, eio_cb cb, void data); / result=ptr2 allocated dynamically */
320	root	1.7	eio_req eio_stat (const char path, int pri, eio_cb cb, void data); / stat buffer=ptr2 allocated dynamically */
321			eio_req eio_lstat (const char path, int pri, eio_cb cb, void data); / stat buffer=ptr2 allocated dynamically */
322	root	1.26	eio_req eio_statvfs (const char path, int pri, eio_cb cb, void data); / stat buffer=ptr2 allocated dynamically */
323	root	1.7	eio_req eio_mknod (const char path, mode_t mode, dev_t dev, int pri, eio_cb cb, void *data);
324			eio_req eio_link (const char path, const char new_path, int pri, eio_cb cb, void data);
325			eio_req eio_symlink (const char path, const char new_path, int pri, eio_cb cb, void data);
326			eio_req eio_rename (const char path, const char new_path, int pri, eio_cb cb, void data);
327	root	1.32	eio_req eio_custom (void (execute)(eio_req ), int pri, eio_cb cb, void data);
328	root	1.10	#endif
329	root	1.1
330	root	1.11	/*****************************************************************************/
331			/* groups */
332
333	root	1.7	eio_req eio_grp (eio_cb cb, void data);
334	root	1.2	void eio_grp_feed (eio_req grp, void (feed)(eio_req *req), int limit);
335			void eio_grp_limit (eio_req *grp, int limit);
336	root	1.1	void eio_grp_add (eio_req grp, eio_req req);
337			void eio_grp_cancel (eio_req grp); / cancels all sub requests but not the group */
338
339	root	1.11	/*****************************************************************************/
340			/* request api */
341	root	1.6
342			/* true if the request was cancelled, useful in the invoke callback */
343	root	1.35	#define EIO_CANCELLED(req) ((req)->cancelled)
344	root	1.6
345	root	1.26	#define EIO_RESULT(req) ((req)->result)
346	root	1.6	/* returns a pointer to the result buffer allocated by eio */
347	root	1.26	#define EIO_BUF(req) ((req)->ptr2)
348			#define EIO_STAT_BUF(req) ((EIO_STRUCT_STAT *)EIO_BUF(req))
349			#define EIO_STATVFS_BUF(req) ((EIO_STRUCT_STATVFS *)EIO_BUF(req))
350			#define EIO_PATH(req) ((char *)(req)->ptr1)
351	root	1.6
352	root	1.1	/* submit a request for execution */
353			void eio_submit (eio_req *req);
354	root	1.11	/* cancel a request as soon fast as possible, if possible */
355			void eio_cancel (eio_req *req);
356	root	1.1
357	root	1.5	/*****************************************************************************/
358	root	1.34	/* convenience functions */
359	root	1.5
360	root	1.39	eio_ssize_t eio_sendfile_sync (int ofd, int ifd, off_t offset, size_t count);
361	root	1.5
362	root	1.14	#ifdef __cplusplus
363			}
364			#endif
365
366	root	1.1	#endif
367