Manual browser: cpu_need_resched(9)
|CPU_NEED_RESCHED(9)||Kernel Developer's Manual||CPU_NEED_RESCHED(9)|
NAMEcpu_need_resched — context switch notification
cpu_need_resched(struct cpu_info *ci, int flags);
DESCRIPTIONThe cpu_need_resched() function is the machine-independent interface for the scheduler to notify machine-dependent code that a context switch from the current LWP, on the cpu ci, is required. This event may occur if a higher priority LWP appears on the run queue or if the current LWP has exceeded its time slice.
If RESCHED_KPREEMPT flag is specified in flags and __HAVE_PREEMPTION C pre-processor macro is defined in <machine/intr.h>, machine-dependent code should make a context switch happen as soon as possible even if the cpu is running the kernel code.
If RESCHED_IMMED flag is specified in flags, machine-dependent code should make a context switch happen as soon as possible. In that case, for example, if ci is not the current processor, cpu_need_resched() typically issues an inter processor call to the processor to make it notice the need of a context switch as soon as possible.
Typically, the cpu_need_resched() function will perform the following operations:
|July 31, 2010||NetBSD 7.0|