| // Copyright 2018 Google LLC |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package gate_test |
| |
| import ( |
| "sync" |
| "testing" |
| "time" |
| |
| "github.com/google/netstack/gate" |
| ) |
| |
| func TestBasicEnter(t *testing.T) { |
| var g gate.Gate |
| |
| if !g.Enter() { |
| t.Fatalf("Failed to enter when it should be allowed") |
| } |
| |
| g.Leave() |
| |
| g.Close() |
| |
| if g.Enter() { |
| t.Fatalf("Allowed to enter when it should fail") |
| } |
| } |
| |
| func enterFunc(t *testing.T, g *gate.Gate, enter, leave, reenter chan struct{}, done1, done2, done3 *sync.WaitGroup) { |
| // Wait until instructed to enter. |
| <-enter |
| if !g.Enter() { |
| t.Errorf("Failed to enter when it should be allowed") |
| } |
| |
| done1.Done() |
| |
| // Wait until instructed to leave. |
| <-leave |
| g.Leave() |
| |
| done2.Done() |
| |
| // Wait until instructed to reenter. |
| <-reenter |
| if g.Enter() { |
| t.Errorf("Allowed to enter when it should fail") |
| } |
| done3.Done() |
| } |
| |
| func TestConcurrentEnter(t *testing.T) { |
| var g gate.Gate |
| var done1, done2, done3 sync.WaitGroup |
| |
| // Create 1000 worker goroutines. |
| enter := make(chan struct{}) |
| leave := make(chan struct{}) |
| reenter := make(chan struct{}) |
| done1.Add(1000) |
| done2.Add(1000) |
| done3.Add(1000) |
| for i := 0; i < 1000; i++ { |
| go enterFunc(t, &g, enter, leave, reenter, &done1, &done2, &done3) |
| } |
| |
| // Tell them all to enter, then leave. |
| close(enter) |
| done1.Wait() |
| |
| close(leave) |
| done2.Wait() |
| |
| // Close the gate, then have the workers try to enter again. |
| g.Close() |
| close(reenter) |
| done3.Wait() |
| } |
| |
| func closeFunc(g *gate.Gate, done chan struct{}) { |
| g.Close() |
| close(done) |
| } |
| |
| func TestCloseWaits(t *testing.T) { |
| var g gate.Gate |
| |
| // Enter 10 times. |
| for i := 0; i < 10; i++ { |
| if !g.Enter() { |
| t.Fatalf("Failed to enter when it should be allowed") |
| } |
| } |
| |
| // Launch closer. Check that it doesn't complete. |
| done := make(chan struct{}) |
| go closeFunc(&g, done) |
| |
| for i := 0; i < 10; i++ { |
| select { |
| case <-done: |
| t.Fatalf("Close function completed too soon") |
| case <-time.After(100 * time.Millisecond): |
| } |
| |
| g.Leave() |
| } |
| |
| // Now the closer must complete. |
| <-done |
| } |
| |
| func TestMultipleSerialCloses(t *testing.T) { |
| var g gate.Gate |
| |
| // Enter 10 times. |
| for i := 0; i < 10; i++ { |
| if !g.Enter() { |
| t.Fatalf("Failed to enter when it should be allowed") |
| } |
| } |
| |
| // Launch closer. Check that it doesn't complete. |
| done := make(chan struct{}) |
| go closeFunc(&g, done) |
| |
| for i := 0; i < 10; i++ { |
| select { |
| case <-done: |
| t.Fatalf("Close function completed too soon") |
| case <-time.After(100 * time.Millisecond): |
| } |
| |
| g.Leave() |
| } |
| |
| // Now the closer must complete. |
| <-done |
| |
| // Close again should not block. |
| done = make(chan struct{}) |
| go closeFunc(&g, done) |
| |
| select { |
| case <-done: |
| case <-time.After(2 * time.Second): |
| t.Fatalf("Second Close is blocking") |
| } |
| } |
| |
| func worker(g *gate.Gate, done *sync.WaitGroup) { |
| for { |
| if !g.Enter() { |
| break |
| } |
| g.Leave() |
| } |
| done.Done() |
| } |
| |
| func TestConcurrentAll(t *testing.T) { |
| var g gate.Gate |
| var done sync.WaitGroup |
| |
| // Launch 1000 goroutines to concurrently enter/leave. |
| done.Add(1000) |
| for i := 0; i < 1000; i++ { |
| go worker(&g, &done) |
| } |
| |
| // Wait for the goroutines to do some work, then close the gate. |
| time.Sleep(2 * time.Second) |
| g.Close() |
| |
| // Wait for all of them to complete. |
| done.Wait() |
| } |