version 1.6, 1995/09/06 21:00:10
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version 1.15, 1997/05/29 19:42:12
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\ A less simple implementation of the blocks wordset. |
\ A less simple implementation of the blocks wordset. |
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\ An more efficient implementation would use mmap on OSs that |
\ Copyright (C) 1995 Free Software Foundation, Inc. |
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\ This file is part of Gforth. |
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\ Gforth is free software; you can redistribute it and/or |
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\ modify it under the terms of the GNU General Public License |
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\ as published by the Free Software Foundation; either version 2 |
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\ of the License, or (at your option) any later version. |
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\ This program is distributed in the hope that it will be useful, |
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\ but WITHOUT ANY WARRANTY; without even the implied warranty of |
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\ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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\ GNU General Public License for more details. |
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\ You should have received a copy of the GNU General Public License |
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\ along with this program; if not, write to the Free Software |
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\ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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\ A more efficient implementation would use mmap on OSs that |
\ provide it and many buffers on OSs that do not provide mmap. |
\ provide it and many buffers on OSs that do not provide mmap. |
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\ Now, the replacement algorithm is "direct mapped"; change to LRU |
\ Now, the replacement algorithm is "direct mapped"; change to LRU |
Line 36 User block-fid
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Line 55 User block-fid
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block-cold |
block-cold |
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Defer flush-file |
Defer flush-blocks |
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: use-file ( addr u -- ) |
: open-blocks ( addr u -- ) \ gforth |
2dup r/w bin open-file 0<> |
\g use the file, whose name is given by @var{addr u}, as blocks file |
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2dup ['] open-fpath-file catch 0<> |
if |
if |
drop r/w bin create-file throw |
2drop r/w bin create-file throw |
else |
else |
nip nip |
rot close-file throw 2dup file-status throw bin open-file throw |
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>r 2drop r> |
then |
then |
block-fid @ IF flush-file block-fid @ close-file throw THEN |
block-fid @ IF flush-blocks block-fid @ close-file throw THEN |
block-fid ! ; |
block-fid ! ; |
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: use ( "file" -- ) \ gforth |
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\g use @var{file} as blocks file |
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name open-blocks ; |
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\ the file is opened as binary file, since it either will contain text |
\ the file is opened as binary file, since it either will contain text |
\ without newlines or binary data |
\ without newlines or binary data |
: get-block-fid ( -- fid ) |
: get-block-fid ( -- fid ) |
block-fid @ 0= |
block-fid @ 0= |
if |
if |
s" blocks.fb" use-file |
s" blocks.fb" open-blocks |
then |
then |
block-fid @ ; |
block-fid @ ; |
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Line 86 Defer flush-file
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Line 111 Defer flush-file
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save-buffers |
save-buffers |
empty-buffers ; |
empty-buffers ; |
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' flush IS flush-file |
' flush IS flush-blocks |
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: get-buffer ( n -- a-addr ) |
: get-buffer ( n -- a-addr ) |
buffers mod buffer-struct drop * block-buffers @ + ; |
buffers mod buffer-struct drop * block-buffers @ + ; |
Line 95 Defer flush-file
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Line 120 Defer flush-file
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dup 0= -35 and throw |
dup 0= -35 and throw |
dup get-buffer >r |
dup get-buffer >r |
dup r@ buffer-block @ <> |
dup r@ buffer-block @ <> |
r@ buffer-fid @ block-fid @ <> and |
r@ buffer-fid @ block-fid @ <> or |
if |
if |
r@ save-buffer |
r@ save-buffer |
dup block-position |
dup block-position |
Line 143 User scr 0 scr !
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Line 168 User scr 0 scr !
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pop-file ( throw ) ; |
pop-file ( throw ) ; |
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: thru ( i*x n1 n2 -- j*x ) |
: thru ( i*x n1 n2 -- j*x ) |
1+ swap 0 ?DO I load LOOP ; |
1+ swap ?DO I load LOOP ; |
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: +load ( i*x n -- j*x ) blk @ + load ; |
: +load ( i*x n -- j*x ) blk @ + load ; |
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: +thru ( i*x n1 n2 -- j*x ) |
: +thru ( i*x n1 n2 -- j*x ) |
1+ swap 0 ?DO I +load LOOP ; |
1+ swap ?DO I +load LOOP ; |
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: --> ( -- ) refill drop ; immediate |
: --> ( -- ) refill drop ; immediate |
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: block-included ( addr u -- ) |
: block-included ( addr u -- ) |
block-fid @ >r block-fid off use-file |
block-fid @ >r block-fid off open-blocks |
1 load block-fid @ close-file throw flush |
1 load block-fid @ close-file throw flush |
r> block-fid ! ; |
r> block-fid ! ; |
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: include ( "name" -- ) |
\ thrown out because it may provide unpleasant surprises - anton |
name 2dup dup 3 - /string s" .fb" compare |
\ : include ( "name" -- ) |
0= IF block-included ELSE included THEN ; |
\ name 2dup dup 3 - /string s" .fb" compare |
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\ 0= IF block-included ELSE included THEN ; |
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get-current environment-wordlist set-current |
get-current environment-wordlist set-current |
true constant block |
true constant block |