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GuruMeditation
Docs » Autodocs » exec.library » Disable

NAME

	Disable -- disable interrupt processing.

SYNOPSIS

	Disable();
void Disable(void);

FUNCTION

	Prevents interrupts from being handled by the system, until a
matching Enable() is executed. Disable() implies Forbid().
DO NOT USE THIS CALL WITHOUT GOOD JUSTIFICATION. THIS CALL IS
VERY DANGEROUS!

RESULT

	All interrupt processing is deferred until the task executing makes
a call to Enable() or is placed in a wait state. Normal task
rescheduling does not occur while interrupts are disabled. In order
to restore normal interrupt processing, the programmer must execute
exactly one call to Enable() for every call to Disable().
IMPORTANT REMINDER:
It is important to remember that there is a danger in using
disabled sections. Disabling interrupts for more than ~250
microseconds will prevent vital system functions (especially serial
I/0) from operating in a normal fashion.
Think twice before using Disable(), then think once more.
After all that, think again. With enough thought, the need
for a Disable() can often be eliminated. For the user of many
device drivers, a write to disable *only* the particular interrupt
of interest can replace a Disable(). For example:
MOVE.W #INTF_PORTS,_intena
Do not use a macro for Disable(), insist on the real thing.
This call may be made from interrupts, it will have the effect
of locking out all higher-level interrupts (lower-level interrupts
are automatically disabled by the CPU).
Note: In the event of a task entering a Wait() after disabling
interrupts, the system "breaks" the disabled state and runs
normally until the task which called Disable() is rescheduled.

NOTES

	This call is guaranteed to preserve all registers.

SEE ALSO

Forbid(), Permit(), Enable()

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