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