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-.\" Copyright (c) 1990, 1993
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-.\"	@(#)mpool.3	8.1 (Berkeley) 6/4/93
-.\" $FreeBSD: src/lib/libc/db/man/mpool.3,v 1.9 2001/10/01 16:08:50 ru Exp $
-.\"
-.Dd June 4, 1993
-.Dt MPOOL 3
-.Os
-.Sh NAME
-.Nm mpool
-.Nd "shared memory buffer pool"
-.Sh SYNOPSIS
-.In db.h
-.In mpool.h
-.Ft MPOOL *
-.Fn mpool_open "void *key" "int fd" "pgno_t pagesize" "pgno_t maxcache"
-.Ft void
-.Fo mpool_filter
-.Fa "MPOOL *mp"
-.Fa "void (*pgin)(void *, pgno_t, void *)"
-.Fa "void (*pgout)(void *, pgno_t, void *)"
-.Fa "void *pgcookie"
-.Fc
-.Ft void *
-.Fn mpool_new "MPOOL *mp" "pgno_t *pgnoaddr"
-.Ft void *
-.Fn mpool_get "MPOOL *mp" "pgno_t pgno" "u_int flags"
-.Ft int
-.Fn mpool_put "MPOOL *mp" "void *pgaddr" "u_int flags"
-.Ft int
-.Fn mpool_sync "MPOOL *mp"
-.Ft int
-.Fn mpool_close "MPOOL *mp"
-.Sh DESCRIPTION
-.Nm Mpool
-is the library interface intended to provide page oriented buffer management
-of files.
-The buffers may be shared between processes.
-.Pp
-The function
-.Fn mpool_open
-initializes a memory pool.
-The
-.Fa key
-argument is the byte string used to negotiate between multiple
-processes wishing to share buffers.
-If the file buffers are mapped in shared memory, all processes using
-the same key will share the buffers.
-If
-.Fa key
-is
-.Dv NULL ,
-the buffers are mapped into private memory.
-The
-.Fa fd
-argument is a file descriptor for the underlying file, which must be seekable.
-If
-.Fa key
-is
-.No non\- Ns Dv NULL
-and matches a file already being mapped, the
-.Fa fd
-argument is ignored.
-.Pp
-The
-.Fa pagesize
-argument is the size, in bytes, of the pages into which the file is broken up.
-The
-.Fa maxcache
-argument is the maximum number of pages from the underlying file to cache
-at any one time.
-This value is not relative to the number of processes which share a file's
-buffers, but will be the largest value specified by any of the processes
-sharing the file.
-.Pp
-The
-.Fn mpool_filter
-function is intended to make transparent input and output processing of the
-pages possible.
-If the
-.Fa pgin
-function is specified, it is called each time a buffer is read into the memory
-pool from the backing file.
-If the
-.Fa pgout
-function is specified, it is called each time a buffer is written into the
-backing file.
-Both functions are called with the
-.Fa pgcookie
-pointer, the page number and a pointer to the page to being read or written.
-.Pp
-The function
-.Fn mpool_new
-takes an
-.Ft MPOOL
-pointer and an address as arguments.
-If a new page can be allocated, a pointer to the page is returned and
-the page number is stored into the
-.Fa pgnoaddr
-address.
-Otherwise,
-.Dv NULL
-is returned and
-.Va errno
-is set.
-.Pp
-The function
-.Fn mpool_get
-takes a
-.Ft MPOOL
-pointer and a page number as arguments.
-If the page exists, a pointer to the page is returned.
-Otherwise,
-.Dv NULL
-is returned and
-.Va errno
-is set.
-The
-.Fa flags
-parameter is not currently used.
-.Pp
-The function
-.Fn mpool_put
-unpins the page referenced by
-.Fa pgaddr .
-.Fa Pgaddr
-must be an address previously returned by
-.Fn mpool_get
-or
-.Fn mpool_new .
-The
-.Fa flags
-value is specified by
-.Em or Ns 'ing
-any of the following values:
-.Bl -tag -width indent
-.It Dv MPOOL_DIRTY
-The page has been modified and needs to be written to the backing file.
-.El
-.Pp
-.Fn Mpool_put
-returns 0 on success and -1 if an error occurs.
-.Pp
-The function
-.Fn mpool_sync
-writes all modified pages associated with the
-.Ft MPOOL
-pointer to the
-backing file.
-.Fn Mpool_sync
-returns 0 on success and -1 if an error occurs.
-.Pp
-The
-.Fn mpool_close
-function free's up any allocated memory associated with the memory pool
-cookie.
-Modified pages are
-.Em not
-written to the backing file.
-.Fn Mpool_close
-returns 0 on success and -1 if an error occurs.
-.Sh ERRORS
-The
-.Fn mpool_open
-function may fail and set
-.Va errno
-for any of the errors specified for the library routine
-.Xr malloc 3 .
-.Pp
-The
-.Fn mpool_get
-function may fail and set
-.Va errno
-for the following:
-.Bl -tag -width Er
-.It Bq Er EINVAL
-The requested record doesn't exist.
-.El
-.Pp
-The
-.Fn mpool_new
-and
-.Fn mpool_get
-functions may fail and set
-.Va errno
-for any of the errors specified for the library routines
-.Xr read 2 ,
-.Xr write 2 ,
-and
-.Xr malloc 3 .
-.Pp
-The
-.Fn mpool_sync
-function may fail and set
-.Va errno
-for any of the errors specified for the library routine
-.Xr write 2 .
-.Pp
-The
-.Fn mpool_close
-function may fail and set
-.Va errno
-for any of the errors specified for the library routine
-.Xr free 3 .
-.Sh SEE ALSO
-.Xr btree 3 ,
-.Xr dbopen 3 ,
-.Xr hash 3 ,
-.Xr recno 3