104 lines
2.0 KiB
Go
104 lines
2.0 KiB
Go
// Copyright (C) 2019 Storj Labs, Inc.
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// See LICENSE for copying information
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package sync2_test
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import (
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"fmt"
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"io"
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"math/rand"
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"sync"
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"sync/atomic"
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"testing"
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"time"
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"storj.io/storj/private/sync2"
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)
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func ExampleThrottle() {
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throttle := sync2.NewThrottle()
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var wg sync.WaitGroup
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// consumer
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go func() {
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defer wg.Done()
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totalConsumed := int64(0)
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for {
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available, err := throttle.ConsumeOrWait(8)
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if err != nil {
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return
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}
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fmt.Println("- consuming ", available, " total=", totalConsumed)
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totalConsumed += available
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// do work for available amount
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time.Sleep(time.Duration(available) * time.Millisecond)
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}
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}()
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// producer
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go func() {
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defer wg.Done()
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step := int64(8)
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for total := int64(64); total >= 0; total -= step {
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err := throttle.ProduceAndWaitUntilBelow(step, step*3)
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if err != nil {
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return
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}
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fmt.Println("+ producing", step, " left=", total)
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time.Sleep(time.Duration(rand.Intn(8)) * time.Millisecond)
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}
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throttle.Fail(io.EOF)
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}()
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wg.Wait()
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fmt.Println("done", throttle.Err())
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}
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func TestThrottleBasic(t *testing.T) {
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t.Parallel()
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throttle := sync2.NewThrottle()
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var stage int64
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c := make(chan error, 1)
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// consumer
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go func() {
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consume, _ := throttle.ConsumeOrWait(4)
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if v := atomic.LoadInt64(&stage); v != 1 || consume != 4 {
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c <- fmt.Errorf("did not block in time: %d / %d", v, consume)
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return
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}
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consume, _ = throttle.ConsumeOrWait(4)
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if v := atomic.LoadInt64(&stage); v != 1 || consume != 4 {
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c <- fmt.Errorf("did not block in time: %d / %d", v, consume)
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return
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}
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atomic.AddInt64(&stage, 2)
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c <- nil
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}()
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// slowly produce
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time.Sleep(time.Millisecond)
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// set stage to 1
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atomic.AddInt64(&stage, 1)
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_ = throttle.Produce(8)
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// wait until consumer consumes twice
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_ = throttle.WaitUntilBelow(3)
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// wait slightly for updating stage
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time.Sleep(time.Millisecond)
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if v := atomic.LoadInt64(&stage); v != 3 {
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t.Fatalf("did not unblock in time: %d", v)
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}
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if err := <-c; err != nil {
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t.Fatal(err)
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}
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}
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