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/*
* Copyright 2018 Google, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Authors: Gabe Black
*/
#ifndef __SYSTEMC_CORE_SCHEDULER_HH__
#define __SYSTEMC_CORE_SCHEDULER_HH__
#include "systemc/core/list.hh"
#include "systemc/core/process.hh"
namespace sc_gem5
{
typedef NodeList<Process> ProcessList;
class Scheduler
{
public:
Scheduler();
uint64_t numCycles() { return _numCycles; }
Process *current() { return _current; }
// Run the initialization phase.
void initialize();
// Run delta cycles until time needs to advance.
void runCycles();
// Put a process on the list of processes to be initialized.
void init(Process *p) { initList.pushLast(p); }
// Run the next process, if there is one.
void yield();
// Put a process on the ready list.
void
ready(Process *p)
{
// Clump methods together to minimize context switching.
if (p->procKind() == ::sc_core::SC_METHOD_PROC_)
readyList.pushFirst(p);
else
readyList.pushLast(p);
}
// Run the given process immediately, preempting whatever may be running.
void
runNow(Process *p)
{
// If a process is running, schedule it/us to run again.
if (_current)
readyList.pushFirst(_current);
// Schedule p to run first.
readyList.pushFirst(p);
yield();
}
private:
uint64_t _numCycles;
Process *_current;
ProcessList initList;
ProcessList readyList;
void evaluate();
void update();
void delta();
};
extern Scheduler scheduler;
} // namespace sc_gem5
#endif // __SYSTEMC_CORE_SCHEDULER_H__
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