minix/lib/libsys/sched_start.c
David van Moolenbroek 80bd109cd3 libsys: various updates
- move system calls for use by services from libminlib into libsys;
- move srv_fork(2) and srv_kill(2) from RS and into libsys;
- replace getprocnr(2) with sef_self(3);
- rename previous getnprocnr(2) to getprocnr(2);
- clean up getepinfo(2);
- change all libsys calls that used _syscall to use _taskcall, so as
  to avoid going through errno to pass errors; this is already how
  most calls work anyway, and many of the calls previously using
  _syscall were already assumed to return the actual error;
- initialize request messages to zero, for future compatibility
  (note that this does not include PCI calls, which are in need of a
  much bigger overhaul, nor kernel calls);
- clean up more of dead DS code as a side effect.

Change-Id: I8788f54c68598fcf58e23486e270c2d749780ebb
2014-03-01 09:05:00 +01:00

102 lines
2.8 KiB
C

#include "syslib.h"
#include <assert.h>
#include <machine/archtypes.h>
#include <minix/timers.h>
#include <string.h>
#include "kernel/config.h"
#include "kernel/const.h"
#include "kernel/type.h"
#include "kernel/proc.h"
/*===========================================================================*
* sched_inherit *
*===========================================================================*/
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 < NR_SCHED_QUEUES);
assert(newscheduler_e);
memset(&m, 0, sizeof(m));
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 *
*===========================================================================*/
int sched_start(endpoint_t scheduler_e,
endpoint_t schedulee_e,
endpoint_t parent_e,
int maxprio,
int quantum,
int cpu,
endpoint_t *newscheduler_e)
{
int rv;
message m;
/* No scheduler given? We are done. */
if(scheduler_e == NONE) {
return OK;
}
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, cpu)) != OK) {
return rv;
}
*newscheduler_e = scheduler_e;
return OK;
}
/* A user-space scheduler must schedule this process. */
memset(&m, 0, sizeof(m));
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);
}