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-.TH INTMAP 3
-.SH NAME
-Intmap, allocmap, freemap, insertkey, caninsertkey, lookupkey,
-deletekey \- integer to data structure maps
-.SH SYNOPSIS
-.ft L
-.nf
-#include <u.h>
-#include <libc.h>
-#include <fcall.h>
-#include <thread.h>
-#include <9p.h>
-.fi
-.PP
-.ft L
-.nf
-.ta \w'\fLIntmap* 'u
-Intmap*	allocmap(void (*inc)(void*))
-void	freemap(Intmap *map, void (*dec)(void*))
-void*	lookupkey(Intmap *map, ulong key)
-void*	insertkey(Intmap *map, ulong key, void *val)
-int	caninsertkey(Intmap *map, ulong key, void *val)
-void*	lookupkey(Intmap *map, ulong key)
-void*	deletekey(Intmap *map, ulong key)
-.fi
-.SH DESCRIPTION
-An
-.B Intmap
-is an arbitrary mapping from integers to pointers.
-.I Allocmap
-creates a new map, and
-.I freemap
-destroys it.
-The
-.I inc
-function is called each time a new pointer is added
-to the map; similarly, 
-.I dec
-is called on each pointer left in the map
-when it is being freed.
-Typically these functions maintain reference counts.
-New entries are added to the map by calling
-.IR insertkey ,
-which will return the previous value
-associated with the given
-.IR key ,
-or zero if there was no previous value.
-.I Caninsertkey
-is like
-.I insertkey
-but only inserts 
-.I val
-if there is no current mapping.
-It returns 1 if
-.I val
-was inserted, 0 otherwise.
-.I Lookupkey
-returns the pointer associated with
-.IR key ,
-or zero if there is no such pointer.
-.I Deletekey
-removes the entry for 
-.I id
-from the map, returning the
-associated pointer, if any.
-.PP
-Concurrent access to
-.BR Intmap s
-is safe, 
-moderated via a 
-.B QLock 
-stored in the 
-.B Intmap
-structure.
-.PP
-In anticipation of the storage of reference-counted
-structures, an increment function 
-.I inc
-may be specified
-at map creation time.
-.I Lookupkey
-calls
-.I inc 
-(if non-zero)
-on pointers before returning them.
-If the reference count adjustments were
-left to the caller (and thus not protected by the lock),
-it would be possible to accidentally reclaim a structure
-if, for example, it was deleted from the map and its
-reference count decremented between the return
-of 
-.I insertkey
-and the external increment.
-.IR Insertkey
-and
-.IR caninsertkey
-do
-.I not
-call
-.I inc
-when inserting 
-.I val
-into the map, nor do
-.I insertkey
-or
-.I deletekey
-call
-.I inc
-when returning old map entries.
-The rationale is that calling
-an insertion function transfers responsibility for the reference
-to the map, and responsibility is given back via the return value of
-.I deletekey
-or the next
-.IR insertkey .
-.PP
-.BR Intmap s
-are used by the 9P library to implement
-.BR Fidpool s
-and
-.BR Reqpool s.
-.SH SOURCE
-.B \*9/src/lib9p/intmap.c
-.SH SEE ALSO
-.IR 9p (3),
-.IR 9pfid (3).