2020-01-09 01:19:35 +00:00
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// Copyright 2020 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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2020-01-10 22:30:33 +00:00
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package tcpip_test
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2020-01-09 01:19:35 +00:00
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import (
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"sync"
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"testing"
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"time"
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"gvisor.dev/gvisor/pkg/tcpip"
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)
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const (
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shortDuration = 1 * time.Nanosecond
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middleDuration = 100 * time.Millisecond
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longDuration = 1 * time.Second
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)
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func TestCancellableTimerFire(t *testing.T) {
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t.Parallel()
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ch := make(chan struct{})
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var lock sync.Mutex
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timer := tcpip.MakeCancellableTimer(&lock, func() {
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ch <- struct{}{}
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})
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timer.Reset(shortDuration)
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// Wait for timer to fire.
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select {
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case <-ch:
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case <-time.After(middleDuration):
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t.Fatal("timed out waiting for timer to fire")
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}
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// The timer should have fired only once.
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select {
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case <-ch:
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t.Fatal("no other timers should have fired")
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case <-time.After(middleDuration):
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}
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}
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func TestCancellableTimerResetFromLongDuration(t *testing.T) {
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t.Parallel()
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ch := make(chan struct{})
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var lock sync.Mutex
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timer := tcpip.MakeCancellableTimer(&lock, func() { ch <- struct{}{} })
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timer.Reset(middleDuration)
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lock.Lock()
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timer.StopLocked()
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lock.Unlock()
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timer.Reset(shortDuration)
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// Wait for timer to fire.
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select {
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case <-ch:
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case <-time.After(middleDuration):
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t.Fatal("timed out waiting for timer to fire")
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}
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// The timer should have fired only once.
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select {
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case <-ch:
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t.Fatal("no other timers should have fired")
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case <-time.After(middleDuration):
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}
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}
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func TestCancellableTimerResetFromShortDuration(t *testing.T) {
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t.Parallel()
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ch := make(chan struct{})
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var lock sync.Mutex
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lock.Lock()
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timer := tcpip.MakeCancellableTimer(&lock, func() { ch <- struct{}{} })
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timer.Reset(shortDuration)
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timer.StopLocked()
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lock.Unlock()
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// Wait for timer to fire if it wasn't correctly stopped.
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select {
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case <-ch:
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t.Fatal("timer fired after being stopped")
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case <-time.After(middleDuration):
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}
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timer.Reset(shortDuration)
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// Wait for timer to fire.
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select {
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case <-ch:
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case <-time.After(middleDuration):
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t.Fatal("timed out waiting for timer to fire")
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}
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// The timer should have fired only once.
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select {
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case <-ch:
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t.Fatal("no other timers should have fired")
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case <-time.After(middleDuration):
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}
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}
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func TestCancellableTimerImmediatelyStop(t *testing.T) {
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t.Parallel()
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ch := make(chan struct{})
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var lock sync.Mutex
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for i := 0; i < 1000; i++ {
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lock.Lock()
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timer := tcpip.MakeCancellableTimer(&lock, func() { ch <- struct{}{} })
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timer.Reset(shortDuration)
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timer.StopLocked()
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lock.Unlock()
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}
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// Wait for timer to fire if it wasn't correctly stopped.
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select {
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case <-ch:
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t.Fatal("timer fired after being stopped")
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case <-time.After(middleDuration):
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}
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}
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func TestCancellableTimerStoppedResetWithoutLock(t *testing.T) {
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t.Parallel()
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ch := make(chan struct{})
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var lock sync.Mutex
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lock.Lock()
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timer := tcpip.MakeCancellableTimer(&lock, func() { ch <- struct{}{} })
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timer.Reset(shortDuration)
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timer.StopLocked()
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lock.Unlock()
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for i := 0; i < 10; i++ {
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timer.Reset(middleDuration)
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lock.Lock()
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// Sleep until the timer fires and gets blocked trying to take the lock.
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time.Sleep(middleDuration * 2)
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timer.StopLocked()
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lock.Unlock()
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}
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// Wait for double the duration so timers that weren't correctly stopped can
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// fire.
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select {
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case <-ch:
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t.Fatal("timer fired after being stopped")
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case <-time.After(middleDuration * 2):
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}
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}
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func TestManyCancellableTimerResetAfterBlockedOnLock(t *testing.T) {
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t.Parallel()
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ch := make(chan struct{})
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var lock sync.Mutex
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lock.Lock()
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timer := tcpip.MakeCancellableTimer(&lock, func() { ch <- struct{}{} })
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timer.Reset(shortDuration)
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for i := 0; i < 10; i++ {
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// Sleep until the timer fires and gets blocked trying to take the lock.
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time.Sleep(middleDuration)
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timer.StopLocked()
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timer.Reset(shortDuration)
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}
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lock.Unlock()
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// Wait for double the duration for the last timer to fire.
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select {
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case <-ch:
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case <-time.After(middleDuration):
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t.Fatal("timed out waiting for timer to fire")
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}
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// The timer should have fired only once.
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select {
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case <-ch:
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t.Fatal("no other timers should have fired")
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case <-time.After(middleDuration):
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}
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}
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func TestManyCancellableTimerResetUnderLock(t *testing.T) {
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t.Parallel()
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ch := make(chan struct{})
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var lock sync.Mutex
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lock.Lock()
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timer := tcpip.MakeCancellableTimer(&lock, func() { ch <- struct{}{} })
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timer.Reset(shortDuration)
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for i := 0; i < 10; i++ {
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timer.StopLocked()
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timer.Reset(shortDuration)
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}
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lock.Unlock()
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// Wait for double the duration for the last timer to fire.
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select {
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case <-ch:
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case <-time.After(middleDuration):
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t.Fatal("timed out waiting for timer to fire")
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}
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// The timer should have fired only once.
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select {
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case <-ch:
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t.Fatal("no other timers should have fired")
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case <-time.After(middleDuration):
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}
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}
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