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package semaphore
import (
"testing"
"time"
)
func TestSemaphoreAcquireRelease(t *testing.T) {
sem := New(3, 1*time.Second)
for i := 0; i < 10; i++ {
if err := sem.Acquire(); err != nil {
t.Error(err)
}
if err := sem.Acquire(); err != nil {
t.Error(err)
}
if err := sem.Acquire(); err != nil {
t.Error(err)
}
sem.Release()
sem.Release()
sem.Release()
}
}
func TestSemaphoreBlockTimeout(t *testing.T) {
sem := New(1, 200*time.Millisecond)
if err := sem.Acquire(); err != nil {
t.Error(err)
}
start := time.Now()
if err := sem.Acquire(); err != ErrNoTickets {
t.Error(err)
}
if start.Add(200 * time.Millisecond).After(time.Now()) {
t.Error("semaphore did not wait long enough")
}
sem.Release()
if err := sem.Acquire(); err != nil {
t.Error(err)
}
}
func TestSemaphoreEmpty(t *testing.T) {
sem := New(2, 200*time.Millisecond)
if !sem.IsEmpty() {
t.Error("semaphore should be empty")
}
sem.Acquire()
if sem.IsEmpty() {
t.Error("semaphore should not be empty")
}
sem.Release()
if !sem.IsEmpty() {
t.Error("semaphore should be empty")
}
}
func ExampleSemaphore() {
sem := New(3, 1*time.Second)
for i := 0; i < 10; i++ {
go func() {
if err := sem.Acquire(); err != nil {
return //could not acquire semaphore
}
defer sem.Release()
// do something semaphore-guarded
}()
}
}
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