jmf: mapped files

HANDLEs in dll calls are treated as cd type x rather than *

Name	Type	Description
additem	verb	add item to mapped noun
createjmf	verb	create mapped file
map	verb	map a file
memshare	verb	share memory with a process
memshareclose	verb	close memory shared with memshare
share	verb	share a mapped file
showmap	verb	show all mappings
unmap	verb	unmap a mapped file
unmapall	verb	unmap all mapped files

additem

add item to mapped noun

no longer necessary, but retained for compatibility

createjmf

create mapped file
createjmf fn;msize

map

map a file
[type [,trailing_shape]] map name;filename [;sharename;ro]

memshare

share memory with a process

Form: {mapping-address} =: memshare {'share-name'}

this permits sharing memory with a non-J process

memshare and memshareclose contributed by Tony Zackin

memshareclose

close memory shared with memshare

Form: memshareclose {'share-name'}

unmap

unmap a mapped file
[force] unmap name [;newsize] - 0 ok, 1 not mapped, 2 refs
newsize excludes header size for jmf files

newsize must be an increase in size

unmapall

unmap all mapped files
[force] unmapall dummy  - unmap all