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| -rw-r--r-- | c-user/interrupt_manager.rst | 18 |
1 files changed, 11 insertions, 7 deletions
diff --git a/c-user/interrupt_manager.rst b/c-user/interrupt_manager.rst index 11293f6..1a8e3cb 100644 --- a/c-user/interrupt_manager.rst +++ b/c-user/interrupt_manager.rst @@ -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 |