127 lines
2.1 KiB
Go
127 lines
2.1 KiB
Go
// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package sync_test
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import (
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. "sync"
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"testing"
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)
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func TestCondSignal(t *testing.T) {
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var m Mutex
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c := NewCond(&m)
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n := 2
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running := make(chan bool, n)
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awake := make(chan bool, n)
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for i := 0; i < n; i++ {
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go func() {
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m.Lock()
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running <- true
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c.Wait()
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awake <- true
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m.Unlock()
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}()
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}
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for i := 0; i < n; i++ {
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<-running // Wait for everyone to run.
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}
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for n > 0 {
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select {
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case <-awake:
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t.Fatal("goroutine not asleep")
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default:
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}
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m.Lock()
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c.Signal()
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m.Unlock()
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<-awake // Will deadlock if no goroutine wakes up
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select {
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case <-awake:
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t.Fatal("too many goroutines awake")
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default:
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}
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n--
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}
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c.Signal()
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}
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func TestCondSignalGenerations(t *testing.T) {
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var m Mutex
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c := NewCond(&m)
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n := 100
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running := make(chan bool, n)
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awake := make(chan int, n)
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for i := 0; i < n; i++ {
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go func(i int) {
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m.Lock()
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running <- true
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c.Wait()
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awake <- i
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m.Unlock()
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}(i)
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if i > 0 {
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a := <-awake
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if a != i-1 {
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t.Fatalf("wrong goroutine woke up: want %d, got %d", i-1, a)
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}
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}
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<-running
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m.Lock()
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c.Signal()
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m.Unlock()
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}
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}
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func TestCondBroadcast(t *testing.T) {
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var m Mutex
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c := NewCond(&m)
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n := 200
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running := make(chan int, n)
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awake := make(chan int, n)
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exit := false
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for i := 0; i < n; i++ {
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go func(g int) {
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m.Lock()
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for !exit {
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running <- g
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c.Wait()
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awake <- g
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}
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m.Unlock()
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}(i)
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}
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for i := 0; i < n; i++ {
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for i := 0; i < n; i++ {
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<-running // Will deadlock unless n are running.
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}
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if i == n-1 {
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m.Lock()
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exit = true
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m.Unlock()
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}
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select {
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case <-awake:
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t.Fatal("goroutine not asleep")
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default:
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}
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m.Lock()
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c.Broadcast()
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m.Unlock()
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seen := make([]bool, n)
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for i := 0; i < n; i++ {
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g := <-awake
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if seen[g] {
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t.Fatal("goroutine woke up twice")
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}
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seen[g] = true
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}
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}
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select {
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case <-running:
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t.Fatal("goroutine did not exit")
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default:
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}
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c.Broadcast()
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}
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