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Make FLUSH also invalidate the blk cache

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This commit is contained in:
Virgil Dupras 2020-12-25 16:43:20 -05:00
parent 6f4f870dd4
commit 18f6978399
3 changed files with 11 additions and 2 deletions
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2
blk.fs
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@ -1939,7 +1939,7 @@ SYSVARS 0x0c + :** C<*
: BLK! ( -- ) : BLK! ( -- )
BLK> @ BLK!* @ EXECUTE BLK> @ BLK!* @ EXECUTE
0 BLKDTY ! ; 0 BLKDTY ! ;
: FLUSH BLKDTY @ IF BLK! THEN ; : FLUSH BLKDTY @ IF BLK! THEN -1 BLK> ! ;
: BLK@ ( n -- ) : BLK@ ( n -- )
DUP BLK> @ = IF DROP EXIT THEN DUP BLK> @ = IF DROP EXIT THEN
FLUSH DUP BLK> ! BLK@* @ EXECUTE ; FLUSH DUP BLK> ! BLK@* @ EXECUTE ;

3
doc/dict.txt
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@ -264,7 +264,8 @@ BLK> -- a Address of the current block variable.
BLK( -- a Beginning addr of blk buf. BLK( -- a Beginning addr of blk buf.
BLK) -- a Ending addr of blk buf. BLK) -- a Ending addr of blk buf.
COPY s d -- Copy contents of s block to d block. COPY s d -- Copy contents of s block to d block.
FLUSH -- Write current block to disk if dirty. FLUSH -- Write current block to disk if dirty and inval-
idates current block cache.
LIST n -- Prints the contents of the block n on screen LIST n -- Prints the contents of the block n on screen
in the form of 16 lines of 64 columns. in the form of 16 lines of 64 columns.
LOAD n -- Interprets Forth code from block n LOAD n -- Interprets Forth code from block n

8
doc/usage.txt
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@ -108,6 +108,8 @@ Many blocks contain code. That code can be interpreted through
LOAD. Programs stored in blocks frequently have "loader blocks" LOAD. Programs stored in blocks frequently have "loader blocks"
that take care of loading all blocks relevant to the program. that take care of loading all blocks relevant to the program.
# Spanning multiple disks
Blocks spanning multiple disks are tricky. If your media isn't Blocks spanning multiple disks are tricky. If your media isn't
large enough to hold all Collapse OS blocks in one unit, you'll large enough to hold all Collapse OS blocks in one unit, you'll
have to make it span multiple disks. Block reference in have to make it span multiple disks. Block reference in
@ -123,6 +125,12 @@ Although the usage of absolute LOAD calls are minimally used
When you span Collapse OS over multiple disks, don't forget to When you span Collapse OS over multiple disks, don't forget to
adjust those absolute LOADs. adjust those absolute LOADs.
When you work with multiple disks, you have to remember to FLUSH
before swapping the disk. This will write current block if it's
dirty and also invalidate the cache. This way, you're not at
risk of either overwriting a block on your other disk or LOADing
cached contents without noticing.
# How blocks are organized # How blocks are organized
Organization of contiguous blocks is an ongoing challenge and Organization of contiguous blocks is an ongoing challenge and