imep_timers.cc

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00001 /* -*-  Mode:C++; c-basic-offset:8; tab-width:8; indent-tabs-mode:t -*- */
00002 /*
00003  * Copyright (c) 1997 Regents of the University of California.
00004  * All rights reserved.
00005  *
00006  * Redistribution and use in source and binary forms, with or without
00007  * modification, are permitted provided that the following conditions
00008  * are met:
00009  * 1. Redistributions of source code must retain the above copyright
00010  *    notice, this list of conditions and the following disclaimer.
00011  * 2. Redistributions in binary form must reproduce the above copyright
00012  *    notice, this list of conditions and the following disclaimer in the
00013  *    documentation and/or other materials provided with the distribution.
00014  * 3. All advertising materials mentioning features or use of this software
00015  *    must display the following acknowledgement:
00016  *      This product includes software developed by the Computer Systems
00017  *      Engineering Group at Lawrence Berkeley Laboratory.
00018  * 4. Neither the name of the University nor of the Laboratory may be used
00019  *    to endorse or promote products derived from this software without
00020  *    specific prior written permission.
00021  *
00022  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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00034 /* Ported from CMU/Monarch's code*/
00035 
00036 /* 
00037    imep_timers.cc
00038    $Id: imep_timers.cc,v 1.2 1999/08/12 21:17:25 yaxu Exp $
00039    */
00040 
00041 #include <imep/imep.h>
00042 
00043 #include <packet.h>
00044 #include <ip.h>
00045 
00046 #define CURRENT_TIME    Scheduler::instance().clock()
00047 
00048 // ======================================================================
00049 // ======================================================================
00050 
00051 void
00052 imepTimer::handle(Event *)
00053 {
00054     busy_ = 0;
00055     agent->handlerTimer(type_);
00056 }
00057 
00058 void
00059 imepTimer::start(double time)
00060 {
00061     assert(busy_ == 0);
00062     busy_ = 1;
00063     Scheduler::instance().schedule(this, &intr, time);
00064 }
00065 
00066 void
00067 imepTimer::cancel()
00068 {
00069     assert(busy_ == 1);
00070     busy_ = 0;
00071     Scheduler::instance().cancel(&intr);
00072 }
00073 
00074 double
00075 imepTimer::timeLeft()
00076 {
00077         assert(busy_ == 1);
00078     return intr.time_ - CURRENT_TIME;
00079 }

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