package main

import (
        "fmt"
        "runtime"
        _ "unsafe"
)

type Work struct {
        _ [400 - 96]byte

        // cycles is the number of completed GC cycles, where a GC
        // cycle is sweep termination, mark, mark termination, and
        // sweep. This differs from memstats.numgc, which is
        // incremented at mark termination.
        cycles uint32

        // Timing/utilization stats for this cycle.
        stwprocs, maxprocs                 int32
        tSweepTerm, tMark, tMarkTerm, tEnd int64 // nanotime() of phase start

        pauseNS    int64 // total STW time this cycle
        pauseStart int64 // nanotime() of last STW

        // debug.gctrace heap sizes for this cycle.
        heap0, heap1, heap2, heapGoal uint64
}

//go:linkname work runtime.work
var work Work

func main() {
        work.cycles = ^uint32(0) - 3
        runtime.GC()
        fmt.Println(work.cycles)
        runtime.GC()
        fmt.Println(work.cycles)
        runtime.GC()
        fmt.Println(work.cycles)
}