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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.

NAME

SYNOPSIS

FUNCTION

RESULT

NOTES

SEE ALSO

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