man rtl_allow_interrupts () - control the CPU interrupt state
NAME
rtl_no_interrupts, rtl_restore_interruptsrtl_restore_interrupts, rtl_stop_interruptsrtl_stop_interrupts, rtl_allow_interruptsrtl_allow_interrupts - control the 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 Realtime Linux extensions.
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_allow_interrupts enables the interrupts.
EXAMPLE
The following example demonstrates a typical usage.
CW {
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 only affect the interrupt flags of the current processor.
Be sure to disable hardware interrupts for short periods of time only. Do not enable interrupts in a hard signal/interrupt handler unless you really know what you are doing.
AUTHOR
Michael Barabanov (baraban@fsmlabs.com (link to URL mailto:baraban@fsmlabs.com) )
SEE ALSO
rtl_request_irq(3) (link to URL rtl_request_irq.3.html) , rtl_free_irq(3) (link to URL rtl_free_irq.3.html) , rtl_hard_enable_irq(3) (link to URL rtl_hard_enable_irq.3.html) , rtl_hard_disable_irq(3) (link to URL rtl_hard_disable_irq.3.html)
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