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57 lines
1.8 KiB
C++
57 lines
1.8 KiB
C++
//
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// MicroOpScheduler.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 14/05/2017.
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// Copyright © 2017 Thomas Harte. All rights reserved.
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//
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#ifndef MicroOpScheduler_hpp
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#define MicroOpScheduler_hpp
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namespace CPU {
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template <class T> class MicroOpScheduler {
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public:
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MicroOpScheduler() :
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scheduled_programs_{nullptr, nullptr, nullptr, nullptr},
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schedule_programs_write_pointer_(0),
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schedule_programs_read_pointer_(0),
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scheduled_program_counter_(nullptr) {}
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protected:
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/*
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Up to four programs can be scheduled; each will be carried out in turn. This
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storage maintains pointers to the scheduled list of programs.
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Programs should be terminated by an OperationMoveToNextProgram, causing this
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queue to take that step.
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*/
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const T *scheduled_programs_[4];
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const T *scheduled_program_counter_;
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unsigned int schedule_programs_write_pointer_, schedule_programs_read_pointer_;
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/*!
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Schedules a new program, adding it to the end of the queue. Programs should be
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terminated with a OperationMoveToNextProgram. No attempt to copy the program
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is made; a non-owning reference is kept.
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@param program The program to schedule.
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*/
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inline void schedule_program(const T *program) {
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scheduled_programs_[schedule_programs_write_pointer_] = program;
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if(schedule_programs_write_pointer_ == schedule_programs_read_pointer_) scheduled_program_counter_ = program;
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schedule_programs_write_pointer_ = (schedule_programs_write_pointer_+1)&3;
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}
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inline void move_to_next_program() {
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scheduled_programs_[schedule_programs_read_pointer_] = nullptr;
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schedule_programs_read_pointer_ = (schedule_programs_read_pointer_+1)&3;
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scheduled_program_counter_ = scheduled_programs_[schedule_programs_read_pointer_];
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}
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};
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}
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#endif /* MicroOpScheduler_hpp */
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