You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
100 lines
2.9 KiB
100 lines
2.9 KiB
/*
|
|
* MinIO Cloud Storage, (C) 2016 MinIO, Inc.
|
|
*
|
|
* 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 cmd
|
|
|
|
import (
|
|
"context"
|
|
"runtime"
|
|
"testing"
|
|
"time"
|
|
)
|
|
|
|
// WARNING:
|
|
//
|
|
// Expected source line number is hard coded, 31, in the
|
|
// following test. Adding new code before this test or changing its
|
|
// position will cause the line number to change and the test to FAIL
|
|
// Tests getSource().
|
|
func TestGetSource(t *testing.T) {
|
|
currentSource := func() string { return getSource(2) }
|
|
gotSource := currentSource()
|
|
// Hard coded line number, 34, in the "expectedSource" value
|
|
expectedSource := "[namespace-lock_test.go:34:TestGetSource()]"
|
|
if gotSource != expectedSource {
|
|
t.Errorf("expected : %s, got : %s", expectedSource, gotSource)
|
|
}
|
|
}
|
|
|
|
// Test lock race
|
|
func TestNSLockRace(t *testing.T) {
|
|
ctx := context.Background()
|
|
|
|
for i := 0; i < 10000; i++ {
|
|
nsLk := newNSLock(false)
|
|
|
|
// lk1; ref=1
|
|
if !nsLk.lock(ctx, "volume", "path", "source", "opsID", false, time.Second) {
|
|
t.Fatal("failed to acquire lock")
|
|
}
|
|
|
|
// lk2
|
|
lk2ch := make(chan struct{})
|
|
go func() {
|
|
defer close(lk2ch)
|
|
nsLk.lock(ctx, "volume", "path", "source", "opsID", false, 1*time.Millisecond)
|
|
}()
|
|
time.Sleep(1 * time.Millisecond) // wait for goroutine to advance; ref=2
|
|
|
|
// Unlock the 1st lock; ref=1 after this line
|
|
nsLk.unlock("volume", "path", false)
|
|
|
|
// Taking another lockMapMutex here allows queuing up additional lockers. This should
|
|
// not be required but makes reproduction much easier.
|
|
nsLk.lockMapMutex.Lock()
|
|
|
|
// lk3 blocks.
|
|
lk3ch := make(chan bool)
|
|
go func() {
|
|
lk3ch <- nsLk.lock(ctx, "volume", "path", "source", "opsID", false, 0)
|
|
}()
|
|
|
|
// lk4, blocks.
|
|
lk4ch := make(chan bool)
|
|
go func() {
|
|
lk4ch <- nsLk.lock(ctx, "volume", "path", "source", "opsID", false, 0)
|
|
}()
|
|
runtime.Gosched()
|
|
|
|
// unlock the manual lock
|
|
nsLk.lockMapMutex.Unlock()
|
|
|
|
// To trigger the race:
|
|
// 1) lk3 or lk4 need to advance and increment the ref on the existing resource,
|
|
// successfully acquiring the lock.
|
|
// 2) lk2 then needs to advance and remove the resource from lockMap.
|
|
// 3) lk3 or lk4 (whichever didn't execute in step 1) then executes and creates
|
|
// a new entry in lockMap and acquires a lock for the same resource.
|
|
|
|
<-lk2ch
|
|
lk3ok := <-lk3ch
|
|
lk4ok := <-lk4ch
|
|
|
|
if lk3ok && lk4ok {
|
|
t.Fatalf("multiple locks acquired; iteration=%d, lk3=%t, lk4=%t", i, lk3ok, lk4ok)
|
|
}
|
|
}
|
|
}
|
|
|