126 lines
3.5 KiB
C
126 lines
3.5 KiB
C
/* This file contains the main program of the SCHED scheduler. It will sit idle
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* until asked, by PM, to take over scheduling a particular process.
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*/
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/* The _MAIN def indicates that we want the schedproc structs to be created
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* here. Used from within schedproc.h */
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#define _MAIN
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#include "sched.h"
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#include "schedproc.h"
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/* Declare some local functions. */
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static void reply(endpoint_t whom, message *m_ptr);
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static void sef_local_startup(void);
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struct machine machine; /* machine info */
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/*===========================================================================*
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* main *
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*===========================================================================*/
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int main(void)
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{
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/* Main routine of the scheduler. */
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message m_in; /* the incoming message itself is kept here. */
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int call_nr; /* system call number */
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int who_e; /* caller's endpoint */
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int result; /* result to system call */
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int rv;
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int s;
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/* SEF local startup. */
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sef_local_startup();
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if (OK != (s=sys_getmachine(&machine)))
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panic("couldn't get machine info: %d", s);
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/* Initialize scheduling timers, used for running balance_queues */
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init_scheduling();
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/* This is SCHED's main loop - get work and do it, forever and forever. */
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while (TRUE) {
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int ipc_status;
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/* Wait for the next message and extract useful information from it. */
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if (sef_receive_status(ANY, &m_in, &ipc_status) != OK)
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panic("SCHED sef_receive error");
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who_e = m_in.m_source; /* who sent the message */
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call_nr = m_in.m_type; /* system call number */
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/* Check for system notifications first. Special cases. */
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if (is_ipc_notify(ipc_status)) {
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switch(who_e) {
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case CLOCK:
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expire_timers(m_in.NOTIFY_TIMESTAMP);
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continue; /* don't reply */
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default :
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result = ENOSYS;
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}
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goto sendreply;
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}
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switch(call_nr) {
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case SCHEDULING_INHERIT:
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case SCHEDULING_START:
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result = do_start_scheduling(&m_in);
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break;
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case SCHEDULING_STOP:
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result = do_stop_scheduling(&m_in);
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break;
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case SCHEDULING_SET_NICE:
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result = do_nice(&m_in);
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break;
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case SCHEDULING_NO_QUANTUM:
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/* This message was sent from the kernel, don't reply */
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if (IPC_STATUS_FLAGS_TEST(ipc_status,
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IPC_FLG_MSG_FROM_KERNEL)) {
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if ((rv = do_noquantum(&m_in)) != (OK)) {
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printf("SCHED: Warning, do_noquantum "
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"failed with %d\n", rv);
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}
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continue; /* Don't reply */
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}
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else {
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printf("SCHED: process %d faked "
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"SCHEDULING_NO_QUANTUM message!\n",
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who_e);
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result = EPERM;
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}
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break;
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default:
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result = no_sys(who_e, call_nr);
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}
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sendreply:
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/* Send reply. */
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if (result != SUSPEND) {
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m_in.m_type = result; /* build reply message */
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reply(who_e, &m_in); /* send it away */
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}
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}
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return(OK);
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}
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/*===========================================================================*
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* reply *
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*===========================================================================*/
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static void reply(endpoint_t who_e, message *m_ptr)
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{
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int s = send(who_e, m_ptr); /* send the message */
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if (OK != s)
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printf("SCHED: unable to send reply to %d: %d\n", who_e, s);
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}
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/*===========================================================================*
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* sef_local_startup *
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*===========================================================================*/
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static void sef_local_startup(void)
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{
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/* No init callbacks for now. */
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/* No live update support for now. */
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/* No signal callbacks for now. */
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/* Let SEF perform startup. */
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sef_startup();
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}
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