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// Copyright 2018 The gVisor Authors.
//
// 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 interrupt
import (
"testing"
)
type countingReceiver struct {
interrupts int
}
// NotifyInterrupt implements Receiver.NotifyInterrupt.
func (r *countingReceiver) NotifyInterrupt() {
r.interrupts++
}
func TestSingleInterruptBeforeEnable(t *testing.T) {
var (
f Forwarder
r countingReceiver
)
f.NotifyInterrupt()
// The interrupt should cause the first Enable to fail.
if f.Enable(&r) {
f.Disable()
t.Fatalf("Enable: got true, wanted false")
}
// The failing Enable "acknowledges" the interrupt, allowing future Enables
// to succeed.
if !f.Enable(&r) {
t.Fatalf("Enable: got false, wanted true")
}
f.Disable()
}
func TestMultipleInterruptsBeforeEnable(t *testing.T) {
var (
f Forwarder
r countingReceiver
)
f.NotifyInterrupt()
f.NotifyInterrupt()
// The interrupts should cause the first Enable to fail.
if f.Enable(&r) {
f.Disable()
t.Fatalf("Enable: got true, wanted false")
}
// Interrupts are deduplicated while the Forwarder is disabled, so the
// failing Enable "acknowledges" all interrupts, allowing future Enables to
// succeed.
if !f.Enable(&r) {
t.Fatalf("Enable: got false, wanted true")
}
f.Disable()
}
func TestSingleInterruptAfterEnable(t *testing.T) {
var (
f Forwarder
r countingReceiver
)
if !f.Enable(&r) {
t.Fatalf("Enable: got false, wanted true")
}
defer f.Disable()
f.NotifyInterrupt()
if r.interrupts != 1 {
t.Errorf("interrupts: got %d, wanted 1", r.interrupts)
}
}
func TestMultipleInterruptsAfterEnable(t *testing.T) {
var (
f Forwarder
r countingReceiver
)
if !f.Enable(&r) {
t.Fatalf("Enable: got false, wanted true")
}
defer f.Disable()
f.NotifyInterrupt()
f.NotifyInterrupt()
if r.interrupts != 2 {
t.Errorf("interrupts: got %d, wanted 2", r.interrupts)
}
}
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