void splx(int x)
Spllo enables interrupts and returns a flag representing the previous interrupt enable state. It must not normally be called from interrupt level.
Splhi disables all maskable interrupts and returns the previous interrupt enable state. The period during which interrupts are disabled had best be short, or real-time applications will suffer.
Splx restores the interrupt enable state state to x, which must be a value returned by a previous call to splhi or spllo.
Islo returns true (non-zero) if interrupts are currently enabled, and 0 otherwise.
|SPLHI(10.2 )||Rev: Thu Feb 15 14:42:59 GMT 2007|