1/*
2 * Copyright 2018 Google, Inc.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met: redistributions of source code must retain the above copyright
7 * notice, this list of conditions and the following disclaimer;
8 * redistributions in binary form must reproduce the above copyright

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25 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 *
27 * Authors: Gabe Black
28 */
29
30#include "systemc/core/scheduler.hh"
31
32#include "base/fiber.hh"
33
34namespace sc_gem5
35{
36
37Scheduler::Scheduler() : _numCycles(0), _current(nullptr) {}
38
39void
40Scheduler::initialize()
41{
42 update();
43
44 while (!initList.empty())
45 ready(initList.getNext());
46
47 delta();
48}
49
50void
51Scheduler::runCycles()
52{
53 while (!readyList.empty()) {
54 evaluate();
55 update();
56 delta();
57 }
58}
59
60void
61Scheduler::yield()
62{
63 _current = readyList.getNext();
64 if (!_current) {
65 // There are no more processes, so return control to evaluate.
66 Fiber::primaryFiber()->run();
67 } else {
68 _current->popListNode();
69 // Switch to whatever Fiber is supposed to run this process. All
70 // Fibers which aren't running should be parked at this line.
71 _current->fiber()->run();
72 // If the current process hasn't been started yet, start it. This
73 // should always be true for methods, but may not be true for threads.
74 if (_current && !_current->running())
75 _current->run();
76 }
77}
78
79void
80Scheduler::evaluate()
81{
82 if (!readyList.empty())
83 _numCycles++;
84
85 do {
86 yield();
87 } while (!readyList.empty());
88}
89
90void
91Scheduler::update()
92{
93}
94
95void
96Scheduler::delta()
97{
98}
99
100Scheduler scheduler;
101
102} // namespace sc_gem5