06b6e5624a
- sys_schedule can change only selected values, -1 means that the current value should be kept unchanged. For instance we mostly want to change the scheduling quantum and priority but we want to keep the process at the current cpu - RS can hand off its processes to scheduler - service can read the destination cpu from system.conf - RS can pass the information farther
47 lines
1.2 KiB
C
47 lines
1.2 KiB
C
#include "kernel/system.h"
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#include <minix/endpoint.h>
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/*===========================================================================*
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* do_schedctl *
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*===========================================================================*/
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PUBLIC int do_schedctl(struct proc * caller, message * m_ptr)
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{
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struct proc *p;
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unsigned flags;
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int priority, quantum, cpu;
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int proc_nr;
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int r;
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/* check parameter validity */
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flags = (unsigned) m_ptr->SCHEDCTL_FLAGS;
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if (flags & ~SCHEDCTL_FLAG_KERNEL) {
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printf("do_schedctl: flags 0x%x invalid, caller=%d\n",
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flags, caller - proc);
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return EINVAL;
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}
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if (!isokendpt(m_ptr->SCHEDCTL_ENDPOINT, &proc_nr))
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return EINVAL;
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p = proc_addr(proc_nr);
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if ((flags & SCHEDCTL_FLAG_KERNEL) == SCHEDCTL_FLAG_KERNEL) {
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/* the kernel becomes the scheduler and starts
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* scheduling the process.
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*/
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priority = (int) m_ptr->SCHEDCTL_PRIORITY;
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quantum = (int) m_ptr->SCHEDCTL_QUANTUM;
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cpu = (int) m_ptr->SCHEDCTL_CPU;
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/* Try to schedule the process. */
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if((r = sched_proc(p, priority, quantum, cpu) != OK))
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return r;
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p->p_scheduler = NULL;
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} else {
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/* the caller becomes the scheduler */
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p->p_scheduler = caller;
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}
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return(OK);
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}
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