i_scheduling_policy.h

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#pragma once
 
#include <cstdint>
#include <string_view>
#include <vector>
 
#include "contur/core/types.h"
 
#include "contur/process/priority.h"
 
namespace contur {
 
    class IClock;

    struct SchedulingProcessSnapshot
    {
        ProcessId pid = INVALID_PID;
        Tick arrivalTime = 0;
        Tick lastStateChange = 0;
        Tick estimatedBurst = 0;
        Tick remainingBurst = 0;
        Tick totalWaitTime = 0;
        PriorityLevel effectivePriority = PriorityLevel::Normal;
        std::int32_t nice = NICE_DEFAULT;
    };

    class ISchedulingPolicy
    {
        public:
        virtual ~ISchedulingPolicy() = default;

        [[nodiscard]] virtual std::string_view name() const noexcept = 0;

        [[nodiscard]] virtual ProcessId
        selectNext(const std::vector<SchedulingProcessSnapshot> &readyQueue, const IClock &clock) const = 0;

        [[nodiscard]] virtual bool shouldPreempt(
            const SchedulingProcessSnapshot &running, const SchedulingProcessSnapshot &candidate, const IClock &clock
        ) const = 0;
    };
 
} // namespace contur