86 lines
1.9 KiB
Go
86 lines
1.9 KiB
Go
// Copyright 2018 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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package procid
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import (
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"os"
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"runtime"
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"sync"
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"syscall"
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"testing"
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)
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// runOnMain is used to send functions to run on the main (initial) thread.
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var runOnMain = make(chan func(), 10)
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func checkProcid(t *testing.T, start *sync.WaitGroup, done *sync.WaitGroup) {
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defer done.Done()
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runtime.LockOSThread()
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defer runtime.UnlockOSThread()
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start.Done()
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start.Wait()
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procID := Current()
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tid := syscall.Gettid()
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if procID != uint64(tid) {
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t.Logf("Bad procid: expected %v, got %v", tid, procID)
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t.Fail()
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}
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}
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func TestProcidInitialized(t *testing.T) {
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var start sync.WaitGroup
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var done sync.WaitGroup
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count := 100
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start.Add(count + 1)
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done.Add(count + 1)
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// Run the check on the main thread.
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//
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// When cgo is not included, the only case when procid isn't initialized
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// is in the main (initial) thread, so we have to test this case
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// specifically.
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runOnMain <- func() {
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checkProcid(t, &start, &done)
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}
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// Run the check on a number of different threads.
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for i := 0; i < count; i++ {
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go checkProcid(t, &start, &done)
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}
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done.Wait()
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}
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func TestMain(m *testing.M) {
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// Make sure we remain at the main (initial) thread.
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runtime.LockOSThread()
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// Start running tests in a different goroutine.
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go func() {
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os.Exit(m.Run())
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}()
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// Execute any functions that have been sent for execution in the main
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// thread.
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for f := range runOnMain {
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f()
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}
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}
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