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