cpu_idle(9) - NetBSD Manual Pages

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CPU_IDLE(9)            NetBSD Kernel Developer's Manual            CPU_IDLE(9)

cpu_idle -- machine-dependent processor idling interface
#include <sys/cpu.h> void cpu_idle(void);
cpu_idle() is called by machine-independent code when the processor has nothing to do. It can be used to conserve the processor power, for exam- ple. cpu_idle() returns immediately if cpu_need_resched() has been called for the processor after the last call of cpu_idle() or cpu_did_resched() on the processor. cpu_idle() returns as soon as possible when cpu_need_resched() is called for the processor. Otherwise, it returns whenever it likes. cpu_idle() is called at IPL_NONE, without any locks held.
The simplest (and, in some cases, the best) implementation of cpu_idle() is the following. void cpu_idle(void) { /* nothing */ }
cpu_need_resched(9), cpu_switchto(9), intro(9), spl(9) NetBSD 9.99 April 20, 2007 NetBSD 9.99
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