Hi,
> "-int" (int-off.asm) counterpart is "int_restore" (int-restore.asm). So,
> why is this "int_restore" header commented out, i.e., not available to
> the high level?
uhm. yes. These words are one of very first ones, that fell out of
scope later on.
> Candidly, as "+int" (int-on.asm) is a simple SEI instruction (Set Global
> Interrupt Flag) one would expect "-int" to be a simple CLI (Clear Global
> Interrupt Flag) but this is not the case...
>
> May I suggest:
>
> +int → SEI
> -int → CLI
Thats fine.
> int_suspend → ( -- SREG ) CLI
> int_restore → ( SREG -- )
These words are not really needed.
\ get the I flag as a forth flag
: int? SREG c@ SREG_I and 0> ;
\ to be used in pairs within the same colon definition
\ can be nested
: critical[
int? r> swap >r >r \ keep the current state
-int \ turn interrupts off
drop \ currently the content of SREG.
;
: ]critical
r> r> if +int then >r \ will crash if not matched
;
\ test case. foo prints bar-1 baz0 qux-1
: bar ." bar" int? . ;
: baz ." baz" int? . ;
: qux ." qux" int? . ;
: foo
bar
critical[
\ nothing will disturb us here
baz
]critical \ now interrupts or other things may happen again
qux ;
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