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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
*/
#include "systemc/core/scheduler.hh"
#include "base/fiber.hh"
namespace sc_gem5
{
Scheduler::Scheduler() : _numCycles(0), _current(nullptr) {}
void
Scheduler::initialize()
{
update();
while (!initList.empty())
ready(initList.getNext());
delta();
}
void
Scheduler::runCycles()
{
while (!readyList.empty()) {
evaluate();
update();
delta();
}
}
void
Scheduler::yield()
{
_current = readyList.getNext();
if (!_current) {
// There are no more processes, so return control to evaluate.
Fiber::primaryFiber()->run();
} else {
_current->popListNode();
// Switch to whatever Fiber is supposed to run this process. All
// Fibers which aren't running should be parked at this line.
_current->fiber()->run();
// If the current process hasn't been started yet, start it. This
// should always be true for methods, but may not be true for threads.
if (_current && !_current->running())
_current->run();
}
}
void
Scheduler::evaluate()
{
if (!readyList.empty())
_numCycles++;
do {
yield();
} while (!readyList.empty());
}
void
Scheduler::update()
{
}
void
Scheduler::delta()
{
}
Scheduler scheduler;
} // namespace sc_gem5
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