113 lines
3.4 KiB
C
113 lines
3.4 KiB
C
#include "pm.h"
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#include <assert.h>
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#include <minix/callnr.h>
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#include <minix/com.h>
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#include <minix/config.h>
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#include <minix/sched.h>
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#include <minix/sysinfo.h>
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#include <minix/type.h>
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#include <machine/archtypes.h>
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#include <lib.h>
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#include "mproc.h"
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#include <machine/archtypes.h>
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#include <timers.h>
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#include "kernel/proc.h"
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/*===========================================================================*
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* init_scheduling *
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*===========================================================================*/
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void sched_init(void)
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{
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struct mproc *trmp;
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endpoint_t parent_e;
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int proc_nr, s;
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for (proc_nr=0, trmp=mproc; proc_nr < NR_PROCS; proc_nr++, trmp++) {
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/* Don't take over system processes. When the system starts,
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* init is blocked on RTS_NO_QUANTUM until PM assigns a
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* scheduler, from which other. Given that all other user
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* processes are forked from init and system processes are
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* managed by RS, there should be no other process that needs
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* to be assigned a scheduler here */
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if (trmp->mp_flags & IN_USE && !(trmp->mp_flags & PRIV_PROC)) {
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assert(_ENDPOINT_P(trmp->mp_endpoint) == INIT_PROC_NR);
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parent_e = mproc[trmp->mp_parent].mp_endpoint;
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assert(parent_e == trmp->mp_endpoint);
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s = sched_start(SCHED_PROC_NR, /* scheduler_e */
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trmp->mp_endpoint, /* schedulee_e */
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parent_e, /* parent_e */
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USER_Q, /* maxprio */
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USER_QUANTUM, /* quantum */
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-1, /* don't change cpu */
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&trmp->mp_scheduler); /* *newsched_e */
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if (s != OK) {
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printf("PM: SCHED denied taking over scheduling of %s: %d\n",
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trmp->mp_name, s);
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}
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}
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}
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}
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/*===========================================================================*
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* sched_start_user *
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*===========================================================================*/
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int sched_start_user(endpoint_t ep, struct mproc *rmp)
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{
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unsigned maxprio;
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endpoint_t inherit_from;
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int rv;
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/* convert nice to priority */
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if ((rv = nice_to_priority(rmp->mp_nice, &maxprio)) != OK) {
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return rv;
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}
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/* scheduler must know the parent, which is not the case for a child
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* of a system process created by a regular fork; in this case the
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* scheduler should inherit settings from init rather than the real
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* parent
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*/
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if (mproc[rmp->mp_parent].mp_flags & PRIV_PROC) {
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assert(mproc[rmp->mp_parent].mp_scheduler == NONE);
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inherit_from = INIT_PROC_NR;
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} else {
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inherit_from = mproc[rmp->mp_parent].mp_endpoint;
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}
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/* inherit quantum */
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return sched_inherit(ep, /* scheduler_e */
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rmp->mp_endpoint, /* schedulee_e */
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inherit_from, /* parent_e */
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maxprio, /* maxprio */
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&rmp->mp_scheduler); /* *newsched_e */
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}
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/*===========================================================================*
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* sched_nice *
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*===========================================================================*/
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int sched_nice(struct mproc *rmp, int nice)
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{
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int rv;
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message m;
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unsigned maxprio;
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/* If the kernel is the scheduler, we don't allow messing with the
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* priority. If you want to control process priority, assign the process
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* to a user-space scheduler */
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if (rmp->mp_scheduler == KERNEL || rmp->mp_scheduler == NONE)
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return (EINVAL);
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if ((rv = nice_to_priority(nice, &maxprio)) != OK) {
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return rv;
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}
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m.SCHEDULING_ENDPOINT = rmp->mp_endpoint;
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m.SCHEDULING_MAXPRIO = (int) maxprio;
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if ((rv = _taskcall(rmp->mp_scheduler, SCHEDULING_SET_NICE, &m))) {
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return rv;
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}
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return (OK);
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}
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