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// Copyright 2020 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.
// +build race
package goid
import (
"runtime"
"sync"
"testing"
)
func TestInitialGoID(t *testing.T) {
const max = 10000
if id := goid(); id < 0 || id > max {
t.Errorf("got goid = %d, want 0 < goid <= %d", id, max)
}
}
// TestGoIDSquence verifies that goid returns values which could plausibly be
// goroutine IDs. If this test breaks or becomes flaky, the structs in
// goid_unsafe.go may need to be updated.
func TestGoIDSquence(t *testing.T) {
// Goroutine IDs are cached by each P.
runtime.GOMAXPROCS(1)
// Fill any holes in lower range.
for i := 0; i < 50; i++ {
var wg sync.WaitGroup
wg.Add(1)
go func() {
wg.Done()
// Leak the goroutine to prevent the ID from being
// reused.
select {}
}()
wg.Wait()
}
id := goid()
for i := 0; i < 100; i++ {
var (
newID int64
wg sync.WaitGroup
)
wg.Add(1)
go func() {
newID = goid()
wg.Done()
// Leak the goroutine to prevent the ID from being
// reused.
select {}
}()
wg.Wait()
if max := id + 100; newID <= id || newID > max {
t.Errorf("unexpected goroutine ID pattern, got goid = %d, want %d < goid <= %d (previous = %d)", newID, id, max, id)
}
id = newID
}
}
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