46 lines
1.2 KiB
C
46 lines
1.2 KiB
C
#include "kernel/system.h"
|
|
#include <minix/endpoint.h>
|
|
|
|
/*===========================================================================*
|
|
* do_schedctl *
|
|
*===========================================================================*/
|
|
int do_schedctl(struct proc * caller, message * m_ptr)
|
|
{
|
|
struct proc *p;
|
|
unsigned flags;
|
|
int priority, quantum, cpu;
|
|
int proc_nr;
|
|
int r;
|
|
|
|
/* check parameter validity */
|
|
flags = (unsigned) m_ptr->SCHEDCTL_FLAGS;
|
|
if (flags & ~SCHEDCTL_FLAG_KERNEL) {
|
|
printf("do_schedctl: flags 0x%x invalid, caller=%d\n",
|
|
flags, caller - proc);
|
|
return EINVAL;
|
|
}
|
|
|
|
if (!isokendpt(m_ptr->SCHEDCTL_ENDPOINT, &proc_nr))
|
|
return EINVAL;
|
|
|
|
p = proc_addr(proc_nr);
|
|
|
|
if ((flags & SCHEDCTL_FLAG_KERNEL) == SCHEDCTL_FLAG_KERNEL) {
|
|
/* the kernel becomes the scheduler and starts
|
|
* scheduling the process.
|
|
*/
|
|
priority = (int) m_ptr->SCHEDCTL_PRIORITY;
|
|
quantum = (int) m_ptr->SCHEDCTL_QUANTUM;
|
|
cpu = (int) m_ptr->SCHEDCTL_CPU;
|
|
|
|
/* Try to schedule the process. */
|
|
if((r = sched_proc(p, priority, quantum, cpu) != OK))
|
|
return r;
|
|
p->p_scheduler = NULL;
|
|
} else {
|
|
/* the caller becomes the scheduler */
|
|
p->p_scheduler = caller;
|
|
}
|
|
|
|
return(OK);
|
|
}
|