75 lines
1.8 KiB
Go
75 lines
1.8 KiB
Go
// Copyright 2020 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// +build race
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package goid
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import (
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"runtime"
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"sync"
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"testing"
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)
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func TestInitialGoID(t *testing.T) {
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const max = 10000
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if id := goid(); id < 0 || id > max {
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t.Errorf("got goid = %d, want 0 < goid <= %d", id, max)
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}
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}
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// TestGoIDSquence verifies that goid returns values which could plausibly be
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// goroutine IDs. If this test breaks or becomes flaky, the structs in
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// goid_unsafe.go may need to be updated.
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func TestGoIDSquence(t *testing.T) {
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// Goroutine IDs are cached by each P.
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runtime.GOMAXPROCS(1)
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// Fill any holes in lower range.
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for i := 0; i < 50; i++ {
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var wg sync.WaitGroup
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wg.Add(1)
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go func() {
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wg.Done()
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// Leak the goroutine to prevent the ID from being
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// reused.
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select {}
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}()
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wg.Wait()
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}
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id := goid()
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for i := 0; i < 100; i++ {
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var (
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newID int64
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wg sync.WaitGroup
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)
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wg.Add(1)
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go func() {
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newID = goid()
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wg.Done()
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// Leak the goroutine to prevent the ID from being
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// reused.
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select {}
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}()
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wg.Wait()
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if max := id + 100; newID <= id || newID > max {
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t.Errorf("unexpected goroutine ID pattern, got goid = %d, want %d < goid <= %d (previous = %d)", newID, id, max, id)
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}
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id = newID
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}
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}
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