go-judge/runner/waiter.go
2019-11-26 01:37:24 -08:00

54 lines
1019 B
Go

package runner
import (
"time"
"github.com/criyle/go-judge/pkg/runner"
)
const minCPUPercent = 40 // 40%
const checkIntervalMS = 50
type waiter struct {
timeLimit time.Duration
}
func (w *waiter) Wait(done chan struct{}, cg runner.CPUAcctor) bool {
var lastCPUUsage uint64
var totalTime time.Duration
lastCheckTime := time.Now()
// wait task done (check each interval)
ticker := time.NewTicker(checkIntervalMS * time.Millisecond)
defer ticker.Stop()
for {
select {
case now := <-ticker.C: // interval
cpuUsage, err := cg.CpuacctUsage()
if err != nil {
return true
}
cpuUsageDelta := time.Duration(cpuUsage - lastCPUUsage)
timeDelta := now.Sub(lastCheckTime)
totalTime += durationMax(cpuUsageDelta, timeDelta*minCPUPercent/100)
if totalTime > w.timeLimit {
return true
}
lastCheckTime = now
lastCPUUsage = cpuUsage
case <-done: // returned
return false
}
}
}
func durationMax(a, b time.Duration) time.Duration {
if a > b {
return a
}
return b
}