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/* This file contains some utility routines for SCHED.
*
* The entry points are:
* no_sys: called for invalid system call numbers
* sched_isokendpt: check the validity of an endpoint
* sched_isemtyendpt check for validity and availability of endpoint slot
* accept_message check whether message is allowed
*/
#include "sched.h"
#include <machine/archtypes.h>
#include <sys/resource.h> /* for PRIO_MAX & PRIO_MIN */
#include "schedproc.h"
/*===========================================================================*
* no_sys *
*===========================================================================*/
int no_sys(int who_e, int call_nr)
{
/* A system call number not implemented by PM has been requested. */
printf("SCHED: in no_sys, call nr %d from %d\n", call_nr, who_e);
return(ENOSYS);
}
/*===========================================================================*
* sched_isokendpt *
*===========================================================================*/
int sched_isokendpt(int endpoint, int *proc)
{
*proc = _ENDPOINT_P(endpoint);
if (*proc < 0)
return (EBADEPT); /* Don't schedule tasks */
if(*proc >= NR_PROCS)
return (EINVAL);
if(endpoint != schedproc[*proc].endpoint)
return (EDEADEPT);
if(!(schedproc[*proc].flags & IN_USE))
return (EDEADEPT);
return (OK);
}
/*===========================================================================*
* sched_isemtyendpt *
*===========================================================================*/
int sched_isemtyendpt(int endpoint, int *proc)
{
*proc = _ENDPOINT_P(endpoint);
if (*proc < 0)
return (EBADEPT); /* Don't schedule tasks */
if(*proc >= NR_PROCS)
return (EINVAL);
if(schedproc[*proc].flags & IN_USE)
return (EDEADEPT);
return (OK);
}
/*===========================================================================*
* accept_message *
*===========================================================================*/
int accept_message(message *m_ptr)
{
/* accept all messages from PM and RS */
switch (m_ptr->m_source) {
case PM_PROC_NR:
case RS_PROC_NR:
return 1;
}
/* no other messages are allowable */
return 0;
}
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