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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
include <xwhen.h>
define LEN_SAVE 10
# INTR_DISABLE, INTR_ENABLE -- Disable interrupts to protect a critical
# section of code. The interrupt handler is saved on a stack and restored
# when interupts are reenabled.
procedure intr_disable()
int sp
int save[LEN_SAVE]
common /zintde/ sp, save
begin
sp = sp + 1
if (sp > LEN_SAVE)
call sys_panic (1, "interrupt save stack overflow")
call zxwhen (X_INT, X_IGNORE, save[sp])
end
# INTR_ENABLE -- Reenable interrupts (restore saved interrupt handler).
procedure intr_enable()
int junk
int sp
int save[LEN_SAVE]
common /zintde/ sp, save
begin
if (sp <= 0)
call sys_panic (1, "interrupt save stack underflow")
call zxwhen (X_INT, save[sp], junk)
sp = sp - 1
end
# INTR_RESET -- Clear the interrupt handler save stack.
procedure intr_reset()
int sp
int save[LEN_SAVE]
common /zintde/ sp, save
begin
sp = 0
end
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