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Diffstat (limited to 'src/systemc/core/scheduler.hh')
-rw-r--r-- | src/systemc/core/scheduler.hh | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/src/systemc/core/scheduler.hh b/src/systemc/core/scheduler.hh new file mode 100644 index 000000000..a7216231a --- /dev/null +++ b/src/systemc/core/scheduler.hh @@ -0,0 +1,101 @@ +/* + * 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__ |