.\"	$NetBSD: vmem_create.9,v 1.3 2006/10/26 12:31:14 wiz Exp $
.\"
.\" Copyright (c)2006 YAMAMOTO Takashi,
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.\" ------------------------------------------------------------
.Dd October 22, 2006
.Dt VMEM_CREATE 9
.Os
.\" ------------------------------------------------------------
.Sh NAME
.Nm vmem_create
.Nd create a vmem arena
.\" ------------------------------------------------------------
.Sh SYNOPSIS
.In sys/vmem.h
.\" - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
.Ft vmem_t
.Fn vmem_create \
"const char *name" "vmem_addr_t base" "vmem_size_t size" "vmem_size_t quantum" \
"vmem_addr_t (*allocfn)(vmem_t *, vmem_size_t, vmem_size_t *, vm_flag_t)" \
"void (*freefn)(vmem_t *, vmem_addr_t, vmem_size_t)" \
"vmem_t *source" "vmem_size_t qcache_max" "vm_flag_t flags"
.\" ------------------------------------------------------------
.Sh DESCRIPTION
.Fn vmem_create
creates a new vmem arena.
.Pp
.Bl -tag -width qcache_max
.It Fa name
The string to describe the vmem.
.It Fa base
The start address of the initial span.
It can be
.Dv VMEM_ADDR_NULL
if no initial span is required.
.It Fa size
The size of the initial span.
.It Fa quantum
The smallest unit of allocation.
.It Fa allocfn
The callback function used to import spans from the backend arena.
.It Fa freefn
The callback function used to free spans to the backend arena.
.It Fa source
The backend arena.
.It Fa qcache_max
The largest size of allocations which can be served by quantum cache.
It is merely a hint and can be ignored.
.It Fa flags
Either of:
.Bl -tag -width VM_NOSLEEP
.It Dv VM_SLEEP
Can sleep until enough resources are available.
.It Dv VM_NOSLEEP
Don't sleep.
Immediately return
.Dv NULL
if there are not enough resources available.
.El
.El
.\" ------------------------------------------------------------
.Sh RETURN VALUES
.Fn vmem_create
return a pointer to the newly allocated vmem_t.
Otherwise, it returns
.Dv NULL .
.\" ------------------------------------------------------------
.Sh SEE ALSO
.Xr intro 9 ,
.Xr vmem 9