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c-user: Clarify rtems_interrupt_flash()

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Sebastian Huber 2017-11-17 13:46:52 +01:00
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18
c-user/interrupt_manager.rst
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@ -404,18 +404,22 @@ DIRECTIVE STATUS CODES:
NONE
DESCRIPTION:
This directive temporarily enables maskable interrupts to the ``level``
which was returned by a previous call to ``rtems_interrupt_disable``.
Immediately prior to invoking this directive, maskable interrupts should be
disabled by a call to ``rtems_interrupt_disable`` and will be redisabled
when this directive returns to the caller.
This directive is functionally equivalent to a
``rtems_interrupt_enable( level )`` immediately followed by a
``rtems_interrupt_disable( level )``. On some
architectures it is possible to provide an optimized implementation for
this sequence.
NOTES:
This directive will not cause the calling task to be preempted.
This directive is only available on uni-processor configurations. The
This directive is only available in uni-processor configurations. The
directives ``rtems_interrupt_local_disable`` and
``rtems_interrupt_local_enable`` is available on all configurations.
``rtems_interrupt_local_enable`` are available in all configurations.
Historically, the interrupt flash directive was heavily used in the
operating system implementation. However, this is no longer the case. The
interrupt flash directive is provided for backward compatibility reasons.
.. raw:: latex