minix/lib/libsys/sched_start.c

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2010-07-01 10:38:15 +02:00
#include "syslib.h"
#include <assert.h>
#include <machine/archtypes.h>
#include <timers.h>
#include "kernel/config.h"
#include "kernel/const.h"
#include "kernel/type.h"
#include "kernel/proc.h"
/*===========================================================================*
* sched_inherit *
*===========================================================================*/
PUBLIC int sched_inherit(endpoint_t scheduler_e,
endpoint_t schedulee_e, endpoint_t parent_e, unsigned maxprio,
endpoint_t *newscheduler_e)
{
int rv;
message m;
assert(_ENDPOINT_P(scheduler_e) >= 0);
assert(_ENDPOINT_P(schedulee_e) >= 0);
assert(_ENDPOINT_P(parent_e) >= 0);
assert(maxprio >= 0);
assert(maxprio < NR_SCHED_QUEUES);
assert(newscheduler_e);
m.SCHEDULING_ENDPOINT = schedulee_e;
m.SCHEDULING_PARENT = parent_e;
m.SCHEDULING_MAXPRIO = (int) maxprio;
/* Send the request to the scheduler */
if ((rv = _taskcall(scheduler_e, SCHEDULING_INHERIT, &m))) {
return rv;
}
/* Store the process' scheduler. Note that this might not be the
* scheduler we sent the SCHEDULING_INHERIT message to. That scheduler
* might have forwarded the scheduling message on to another scheduler
* before returning the message.
*/
*newscheduler_e = m.SCHEDULING_SCHEDULER;
return (OK);
}
/*===========================================================================*
* sched_start *
*===========================================================================*/
PUBLIC int sched_start(endpoint_t scheduler_e, endpoint_t schedulee_e,
endpoint_t parent_e, unsigned maxprio, unsigned quantum,
endpoint_t *newscheduler_e)
{
int rv;
message m;
/* No scheduler given? We are done. */
if(scheduler_e == NONE) {
return OK;
}
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assert(_ENDPOINT_P(schedulee_e) >= 0);
assert(_ENDPOINT_P(parent_e) >= 0);
assert(maxprio >= 0);
assert(maxprio < NR_SCHED_QUEUES);
assert(quantum > 0);
assert(newscheduler_e);
/* The KERNEL must schedule this process. */
if(scheduler_e == KERNEL) {
if ((rv = sys_schedctl(SCHEDCTL_FLAG_KERNEL,
schedulee_e, maxprio, quantum)) != OK) {
return rv;
}
*newscheduler_e = scheduler_e;
return OK;
}
/* A user-space scheduler must schedule this process. */
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m.SCHEDULING_ENDPOINT = schedulee_e;
m.SCHEDULING_PARENT = parent_e;
m.SCHEDULING_MAXPRIO = (int) maxprio;
m.SCHEDULING_QUANTUM = (int) quantum;
/* Send the request to the scheduler */
if ((rv = _taskcall(scheduler_e, SCHEDULING_START, &m))) {
return rv;
}
/* Store the process' scheduler. Note that this might not be the
* scheduler we sent the SCHEDULING_START message to. That scheduler
* might have forwarded the scheduling message on to another scheduler
* before returning the message.
*/
*newscheduler_e = m.SCHEDULING_SCHEDULER;
return (OK);
}