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/*
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 * Project: S.Ha.R.K.
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 *
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 * Coordinators:
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 *   Giorgio Buttazzo    <giorgio@sssup.it>
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 *   Paolo Gai           <pj@gandalf.sssup.it>
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 *
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 * Authors     :
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 *   Paolo Gai           <pj@gandalf.sssup.it>
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 *   (see the web pages for full authors list)
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 *
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 * ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy)
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 *
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 * http://www.sssup.it
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 * http://retis.sssup.it
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 * http://shark.sssup.it
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 */
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/**
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 ------------
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 CVS :        $Id: nanoslp.c,v 1.1.1.1 2002-03-29 14:12:52 pj Exp $
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 File:        $File$
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 Revision:    $Revision: 1.1.1.1 $
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 Last update: $Date: 2002-03-29 14:12:52 $
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 ------------
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 This file contains the nanosleep function (posix 14.2.5) and related
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 functions
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**/
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/*
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 * Copyright (C) 2000 Paolo Gai
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 *
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; either version 2 of the License, or
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 * (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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 *
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 */
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#include <stdarg.h>
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#include <ll/ll.h>
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#include <ll/stdlib.h>
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#include <ll/stdio.h>
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#include <ll/string.h>
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#include <kernel/config.h>
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#include <kernel/model.h>
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#include <kernel/const.h>
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#include <sys/types.h>
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#include <kernel/types.h>
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#include <kernel/descr.h>
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#include <errno.h>
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#include <kernel/var.h>
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#include <kernel/func.h>
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static int nanosleep_once = 1;
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/* this table is used to store the wakeup time of the task,
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   because if the rmtp argument is specified, the remaining sleep time
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   have to be returned. */
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struct timespec nanosleep_table[MAX_PROC];
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/* this is the test that is done when a task is being killed
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   and it is waiting on a sigwait */
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static int nanosleep_cancellation_point(PID i, void *arg)
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{
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    LEVEL l;
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    if (proc_table[i].status == WAIT_NANOSLEEP) {
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      /* the task that have to be killed is waiting on a nanosleep */
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      /* the nanosleep event have to be removed */
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      event_delete(proc_table[i].delay_timer);
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      proc_table[i].delay_timer = -1;
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      /* and the task have to be reinserted into the ready queues, so it
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         will fall into task_testcancel */
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      l = proc_table[i].task_level;
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      level_table[l]->task_insert(l,i);
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      return 1;
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    }
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    return 0;
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}
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int nanosleep_interrupted_by_signal(PID i, void *arg)
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{
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    LEVEL l;
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    struct timespec t1, t2;
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    if (proc_table[i].status == WAIT_NANOSLEEP) {
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      /* the task is waiting on a nanosleep and it is still receiving a
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         signal... */
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      ll_gettime(TIME_EXACT,&t1);
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      SUBTIMESPEC(&nanosleep_table[i], &t1, &t2);
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      TIMESPEC_ASSIGN(&nanosleep_table[i], &t2);
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      /* the nanosleep event have to be removed */
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      event_delete(proc_table[i].delay_timer);
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      proc_table[i].delay_timer = -1;
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      /* and the task have to be reinserted into the ready queues, so it
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         will fall into task_testcancel */
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      l = proc_table[i].task_level;
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      level_table[l]->task_insert(l,i);
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      return 1;
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    }
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    return 0;
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}
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static void nanosleep_timer(void *arg)
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{
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  PID p = (PID)arg;
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  LEVEL l;
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  NULL_TIMESPEC(&nanosleep_table[p]);
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  proc_table[p].delay_timer = -1;
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  l = proc_table[p].task_level;
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  level_table[l]->task_insert(l,p);
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  event_need_reschedule();
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}
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int nanosleep(const struct timespec *rqtp, struct timespec *rmtp)
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{
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  struct timespec ty;
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  TIME tx;
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  LEVEL l;
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  if (rqtp->tv_sec < 0 || rqtp->tv_nsec > 1000000000)
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    return EINVAL;
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  proc_table[exec_shadow].context = kern_context_save();
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  /* first, if it is the first time that the nanosleep is called,
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     register the cancellation point */
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  if (nanosleep_once) {
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    nanosleep_once = 0;
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    register_cancellation_point(nanosleep_cancellation_point, NULL);
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    register_interruptable_point(nanosleep_interrupted_by_signal, NULL);
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  }
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  /* SAME AS SCHEDULER... manage the capacity event and the load_info */
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  ll_gettime(TIME_EXACT, &schedule_time);
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  SUBTIMESPEC(&schedule_time, &cap_lasttime, &ty);
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  tx = TIMESPEC2USEC(&ty);
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  proc_table[exec_shadow].avail_time -= tx;
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  jet_update_slice(tx);
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  if (cap_timer != NIL) {
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    event_delete(cap_timer);
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    cap_timer = NIL;
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  }
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  /* now, we block the current task, waiting the end of the target task */
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  l = proc_table[exec_shadow].task_level;
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  level_table[l]->task_extract(l,exec_shadow);
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  proc_table[exec_shadow].status = WAIT_NANOSLEEP;
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  ADDTIMESPEC(&schedule_time, rqtp, &nanosleep_table[exec_shadow]);
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  /* we can use the delaytimer because if we are here we are not in a
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     task_delay */
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  proc_table[exec_shadow].delay_timer =
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    kern_event_post(&nanosleep_table[exec_shadow],
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                    nanosleep_timer,
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                    (void *)exec_shadow);
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  exec = exec_shadow = -1;
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  scheduler();
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  kern_context_load(proc_table[exec_shadow].context);
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  task_testcancel();
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  /* if the nanosleep_table[exec_shadow] != {0,0}, the nanosleep was
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     interrupted by a signal... */
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  if (nanosleep_table[exec_shadow].tv_sec  != 0 ||
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      nanosleep_table[exec_shadow].tv_nsec != 0    ) {
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    if (rmtp)
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      TIMESPEC_ASSIGN(rmtp, &nanosleep_table[exec_shadow]);
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    return (EINTR);
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  }
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  else
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    return 0;
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}
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unsigned int sleep(unsigned int seconds)
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{
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  struct timespec t, t2;
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  t.tv_sec = seconds;
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  t.tv_nsec = 0;
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  nanosleep(&t, &t2);
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  return t2.tv_sec;
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}
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