factor/library/unix/io.factor

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! Copyright (C) 2005 Slava Pestov.
! See http://factor.sf.net/license.txt for BSD license.
IN: io-internals
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USING: errors generic hashtables kernel lists math namespaces
sequences strings threads vectors ;
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! These let us load the code into a CFactor instance using the
! old C-based I/O. They will be removed soon.
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FORGET: can-read-line?
FORGET: can-read-count?
FORGET: can-write?
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FORGET: add-write-io-task
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TUPLE: io-task port callbacks ;
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GENERIC: do-io-task ( task -- ? )
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GENERIC: io-task-events ( task -- events )
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! A hashtable in the global namespace mapping fd numbers to
! io-tasks. This is not a vector, since we need a quick way
! to find the number of elements, and a hashtable gives us
! this with the hash-size call.
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SYMBOL: io-tasks
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: file-mode OCT: 0600 ;
: io-error ( n -- ) 0 < [ errno strerror throw ] when ;
: open-read ( path -- fd )
O_RDONLY file-mode sys-open dup io-error ;
: open-write ( path -- fd )
O_WRONLY O_CREAT bitor O_TRUNC bitor file-mode sys-open
dup io-error ;
TUPLE: port handle buffer error ;
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C: port ( handle buffer -- port )
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[ >r <buffer> r> set-delegate ] keep
[ set-port-handle ] keep ;
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: buffered-port 8192 <port> ;
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: >port< dup port-handle swap delegate ;
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: pending-error ( reader -- ) port-error throw ;
TUPLE: reader line ready? ;
C: reader ( handle -- reader )
[ >r buffered-port r> set-delegate ] keep ;
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: read-line-loop ( line buffer -- ? )
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dup buffer-length 0 = [
2drop f
] [
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dup buffer-pop dup CHAR: \n = [
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3drop t
] [
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pick sbuf-append read-line-loop
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] ifte
] ifte ;
: read-line-step ( reader -- ? )
[ dup reader-line swap read-line-loop dup ] keep
set-reader-ready? ;
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: init-reader ( count reader -- ) >r <sbuf> r> set-reader-line ;
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: prepare-line ( reader -- ? )
80 over init-reader read-line-step ;
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: can-read-line? ( reader -- ? )
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dup pending-error
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dup reader-ready? [ drop t ] [ prepare-line ] ifte ;
: reader-eof ( reader -- )
dup reader-line dup [
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length 0 = [ f over set-reader-line ] when
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] [
drop
] ifte t swap set-reader-ready? ;
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: read-step ( port -- ? )
>port<
tuck dup buffer-end swap buffer-capacity sys-read
dup 0 >= [ swap n>buffer t ] [ 2drop f ] ifte ;
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: refill ( reader -- )
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dup buffer-length 0 = [
read-step drop
] [
drop
] ifte ;
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: eof? ( buffer -- ? ) buffer-fill 0 = ;
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TUPLE: read-line-task ;
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C: read-line-task ( port callbacks -- task )
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[ >r <io-task> r> set-delegate ] keep ;
M: read-line-task do-io-task
io-task-port dup refill dup eof? [
reader-eof t
] [
read-line-step
] ifte ;
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M: read-line-task io-task-events ( task -- events )
drop read-events ;
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: read-count-step ( count reader -- ? )
dup reader-line -rot >r over length - r>
2dup buffer-fill <= [
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buffer> swap sbuf-append t
] [
buffer>> nip swap sbuf-append f
] ifte ;
: can-read-count? ( count reader -- ? )
dup pending-error
2dup reader-line length >= [
2drop t
] [
2dup init-reader read-count-step
] ifte ;
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TUPLE: read-task count ;
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C: read-task ( port callbacks -- task )
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[ >r <io-task> r> set-delegate ] keep ;
M: read-task do-io-task
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io-task-port dup refill dup eof? [
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nip reader-eof t
] [
read-count-step
] ifte ;
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M: read-task io-task-events ( task -- events )
drop read-events ;
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: pop-line ( reader -- str )
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dup reader-line dup [ sbuf>string ] when >r
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f over set-reader-line
f swap set-reader-ready? r> ;
: read-fin ( reader -- str )
dup pending-error dup reader-ready? [
pop-line
] [
"reader not ready" throw
] ifte ;
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TUPLE: writer ;
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C: writer ( fd -- writer )
[ >r buffered-port r> set-delegate ] keep ;
: write-step ( fd buffer -- ? )
tuck dup buffer@ swap buffer-length sys-write
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dup 0 >= [ swap buffer-consume t ] [ 2drop f ] ifte ;
: can-write? ( len writer -- ? )
#! If the buffer is empty and the string is too long,
#! extend the buffer.
dup pending-error
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dup eof? >r 2dup buffer-capacity > r> and [
buffer-extend t
] [
[ buffer-fill + ] keep buffer-capacity <=
] ifte ;
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TUPLE: write-task ;
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C: write-task ( port callbacks -- task )
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[ >r <io-task> r> set-delegate ] keep ;
M: write-task do-io-task
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io-task-port dup buffer-length 0 = over port-error or [
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0 swap buffer-reset t
] [
>port< write-step
] ifte ;
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M: write-task io-task-events ( task -- events )
drop write-events ;
: write-fin ( str writer -- )
dup pending-error
>r dup string? [ ch>string ] unless r> >buffer ;
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: can-copy? ( from -- ? )
dup eof? [ read-step ] [ drop t ] ifte ;
: copy-from-task ( from to -- ? )
over can-copy? [
over eof? [
2drop t
] [
over buffer-fill over can-write? [
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dupd buffer-append 0 swap buffer-reset
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] [
2drop
] ifte f
] ifte
] [
2drop f
] ifte ;
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: io-task-fd io-task-port port-handle ;
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: add-io-task ( task -- )
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dup io-task-fd io-tasks get 2dup hash [
"Cannot perform multiple I/O ops on the same port" throw
] when set-hash ;
: add-write-io-task ( task -- )
dup io-task-fd io-tasks get hash [
dup write-task? [
[
>r io-task-callbacks r> io-task-callbacks append
] keep set-io-task-callbacks
] [
add-io-task
] ifte
] [
add-io-task
] ifte* ;
: remove-io-task ( task -- )
io-task-fd io-tasks get remove-hash ;
: pop-callback ( task -- callback )
dup io-task-callbacks uncons dup [
rot set-io-task-callbacks
] [
drop swap remove-io-task
] ifte ;
: handle-fd ( fd -- )
io-tasks get hash dup do-io-task [
pop-callback call
] [
drop
] ifte ;
: do-io-tasks ( pollfds n -- )
[
dup pick pollfd-nth dup pollfd-revents 0 = [
drop
] [
pollfd-fd handle-fd
] ifte
] repeat drop ;
: init-pollfd ( task pollfd -- )
over io-task-fd over set-pollfd-fd
swap io-task-events swap set-pollfd-events ;
: make-pollfds ( -- pollfds n )
io-tasks get dup hash-size [
<pollfd-array> swap hash-values [
dup io-task-fd pick pollfd-nth init-pollfd
] each
] keep ;
: io-multiplexer ( -- )
make-pollfds dupd 0 sys-poll do-io-tasks ;
: io-loop ( -- ) io-multiplexer yield io-loop ;
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: init-io ( -- )
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global [ <namespace> io-tasks set ] bind
[ io-loop ] in-thread ;