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