NAME

       rtl_no_interrupts, rtl_restore_interrupts, rtl_stop_inter­
       rupts, rtl_allow_interrupts - control CPU interrupt state



SYNOPSIS

       #include <rtl_sync.h>

       void rtl_no_interrupts(rtl_irqstate_t state);

       void rtl_restore_interrupts(rtl_irqstate_t& state);

       void rtl_stop_interrupts();

       void rtl_allow_interrupts();




DESCRIPTION

       These functions are non-portable  Real-Time  Linux  exten­
       sions.

       rtl_no_interrupts saves the current state of the processor
       interrupt flags in the variable state  and  then  disables
       the interrupts on this processor.

       rtl_restore_interrupts  is defined as a macro. It uses its
       argument to restore the interrupt state  previously  saved
       with rtl_no_interrupts.

       rtl_stop_interrupts disables the interrupts.

       rtl_stop_interrupts enables the interrupts.



EXAMPLE

       The following example demonstrates a typical usage.


       {
            rtl_irqstate_t irqstate;

            rtl_no_interrupts(irqstate);
            /* this code runs with interrupts disabled! */
            rtl_restore_interrupts (irqstate);

            /* interrupt state is back to what it was before */
       }



NOTES

       These functions have effect only on the interrupt flags of
       the current processor.

       Be sure to only  disable  hardware  interrupts  for  short
       periods of time.



AUTHOR

       Michael Barabanov <baraban@fsmlabs.com>



SEE ALSO

       rtl_request_irq(3),                        rtl_free_irq(3)
       rtl_hard_enable_irq(3), rtl_hard_disable_irq(3)












































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