INTRO (9) NetBSD Kernel Developer's Manual INTRO (9) NAME ...

CSF (9) NetBSD Kernel Developer’s Manual CSF (9)pri_tsched_kpri(lwp_t ∗);voidresched_cpu(lwp_t ∗);voidsetrunnable();voidschedclock(lwp_t ∗);voidsched_init(void);DESCRIPTIONCSF provides a modular and self-contained interface for implementing different thread scheduling algorithms.The different schedulers can be selected at compile-time. Currently, the only scheduler available issched_4bsd(9), the traditional 4.4BSD thread scheduler.The interface is divided into two parts: A set of functions each scheduler needs to implement and commonfunctions used by all schedulers.Scheduler-specific functionsThe following functions have to beimplemented by the individual scheduler.Scheduler initializationvoid sched_cpuattach(struct cpu_info ∗)Per-CPU scheduler initialization routine.void sched_rqinit(void)Initialize the scheduler’s runqueue data structures.void sched_setup(void)Setup initial scheduling parameters and kick off timeout driven events.Runqueue handlingRunqueue handling is completely internal to the scheduler. Other parts of the kernel should access runqueuesonly through the following functions:void sched_enqueue(lwp_t ∗ , bool)Place an LWP within the scheduler’s runqueue structures.void sched_dequeue(lwp_t ∗)Remove an LWP from the scheduler’s runqueue structures.lwp_t ∗ sched_nextlwp(void)Return the LWP that should run the CPU next.bool sched_curcpu_runnable_p(void)Indicate if there is a runnable LWP for the current CPU.void sched_print_runqueue(void (∗pr)(const char ∗, ...))Print runqueues in DDB.NetBSD 3.0 July 14, 2007 2