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minio/pkg/lsync/lrwmutex_test.go

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/*
* Minio Cloud Storage, (C) 2017 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.
*/
// GOMAXPROCS=10 go test
package lsync_test
import (
"context"
"fmt"
"sync"
"sync/atomic"
"testing"
"time"
"runtime"
. "github.com/minio/minio/pkg/lsync"
)
func testSimpleWriteLock(t *testing.T, duration time.Duration) (locked bool) {
ctx := context.Background()
lrwm := NewLRWMutex()
if !lrwm.GetRLock(ctx, "", "object1", time.Second) {
panic("Failed to acquire read lock")
}
// fmt.Println("1st read lock acquired, waiting...")
if !lrwm.GetRLock(ctx, "", "object1", time.Second) {
panic("Failed to acquire read lock")
}
// fmt.Println("2nd read lock acquired, waiting...")
go func() {
time.Sleep(2 * time.Second)
lrwm.RUnlock()
// fmt.Println("1st read lock released, waiting...")
}()
go func() {
time.Sleep(3 * time.Second)
lrwm.RUnlock()
// fmt.Println("2nd read lock released, waiting...")
}()
// fmt.Println("Trying to acquire write lock, waiting...")
locked = lrwm.GetLock(ctx, "", "", duration)
if locked {
// fmt.Println("Write lock acquired, waiting...")
time.Sleep(1 * time.Second)
lrwm.Unlock()
} else {
// fmt.Println("Write lock failed due to timeout")
}
return
}
func TestSimpleWriteLockAcquired(t *testing.T) {
locked := testSimpleWriteLock(t, 5*time.Second)
expected := true
if locked != expected {
t.Errorf("TestSimpleWriteLockAcquired(): \nexpected %#v\ngot %#v", expected, locked)
}
}
func TestSimpleWriteLockTimedOut(t *testing.T) {
locked := testSimpleWriteLock(t, time.Second)
expected := false
if locked != expected {
t.Errorf("TestSimpleWriteLockTimedOut(): \nexpected %#v\ngot %#v", expected, locked)
}
}
func testDualWriteLock(t *testing.T, duration time.Duration) (locked bool) {
ctx := context.Background()
lrwm := NewLRWMutex()
// fmt.Println("Getting initial write lock")
if !lrwm.GetLock(ctx, "", "", time.Second) {
panic("Failed to acquire initial write lock")
}
go func() {
time.Sleep(2 * time.Second)
lrwm.Unlock()
// fmt.Println("Initial write lock released, waiting...")
}()
// fmt.Println("Trying to acquire 2nd write lock, waiting...")
locked = lrwm.GetLock(ctx, "", "", duration)
if locked {
// fmt.Println("2nd write lock acquired, waiting...")
time.Sleep(time.Second)
lrwm.Unlock()
} else {
// fmt.Println("2nd write lock failed due to timeout")
}
return
}
func TestDualWriteLockAcquired(t *testing.T) {
locked := testDualWriteLock(t, 3*time.Second)
expected := true
if locked != expected {
t.Errorf("TestDualWriteLockAcquired(): \nexpected %#v\ngot %#v", expected, locked)
}
}
func TestDualWriteLockTimedOut(t *testing.T) {
locked := testDualWriteLock(t, time.Second)
expected := false
if locked != expected {
t.Errorf("TestDualWriteLockTimedOut(): \nexpected %#v\ngot %#v", expected, locked)
}
}
// Test cases below are copied 1 to 1 from sync/rwmutex_test.go (adapted to use LRWMutex)
// Borrowed from rwmutex_test.go
func parallelReader(ctx context.Context, m *LRWMutex, clocked, cunlock, cdone chan bool) {
if m.GetRLock(ctx, "", "", time.Second) {
clocked <- true
<-cunlock
m.RUnlock()
cdone <- true
}
}
// Borrowed from rwmutex_test.go
func doTestParallelReaders(numReaders, gomaxprocs int) {
runtime.GOMAXPROCS(gomaxprocs)
m := NewLRWMutex()
clocked := make(chan bool)
cunlock := make(chan bool)
cdone := make(chan bool)
for i := 0; i < numReaders; i++ {
go parallelReader(context.Background(), m, clocked, cunlock, cdone)
}
// Wait for all parallel RLock()s to succeed.
for i := 0; i < numReaders; i++ {
<-clocked
}
for i := 0; i < numReaders; i++ {
cunlock <- true
}
// Wait for the goroutines to finish.
for i := 0; i < numReaders; i++ {
<-cdone
}
}
// Borrowed from rwmutex_test.go
func TestParallelReaders(t *testing.T) {
defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(-1))
doTestParallelReaders(1, 4)
doTestParallelReaders(3, 4)
doTestParallelReaders(4, 2)
}
// Borrowed from rwmutex_test.go
func reader(rwm *LRWMutex, numIterations int, activity *int32, cdone chan bool) {
for i := 0; i < numIterations; i++ {
if rwm.GetRLock(context.Background(), "", "", time.Second) {
n := atomic.AddInt32(activity, 1)
if n < 1 || n >= 10000 {
panic(fmt.Sprintf("wlock(%d)\n", n))
}
for i := 0; i < 100; i++ {
}
atomic.AddInt32(activity, -1)
rwm.RUnlock()
}
}
cdone <- true
}
// Borrowed from rwmutex_test.go
func writer(rwm *LRWMutex, numIterations int, activity *int32, cdone chan bool) {
for i := 0; i < numIterations; i++ {
if rwm.GetLock(context.Background(), "", "", time.Second) {
n := atomic.AddInt32(activity, 10000)
if n != 10000 {
panic(fmt.Sprintf("wlock(%d)\n", n))
}
for i := 0; i < 100; i++ {
}
atomic.AddInt32(activity, -10000)
rwm.Unlock()
}
}
cdone <- true
}
// Borrowed from rwmutex_test.go
func HammerRWMutex(gomaxprocs, numReaders, numIterations int) {
runtime.GOMAXPROCS(gomaxprocs)
// Number of active readers + 10000 * number of active writers.
var activity int32
rwm := NewLRWMutex()
cdone := make(chan bool)
go writer(rwm, numIterations, &activity, cdone)
var i int
for i = 0; i < numReaders/2; i++ {
go reader(rwm, numIterations, &activity, cdone)
}
go writer(rwm, numIterations, &activity, cdone)
for ; i < numReaders; i++ {
go reader(rwm, numIterations, &activity, cdone)
}
// Wait for the 2 writers and all readers to finish.
for i := 0; i < 2+numReaders; i++ {
<-cdone
}
}
// Borrowed from rwmutex_test.go
func TestRWMutex(t *testing.T) {
defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(-1))
n := 1000
if testing.Short() {
n = 5
}
HammerRWMutex(1, 1, n)
HammerRWMutex(1, 3, n)
HammerRWMutex(1, 10, n)
HammerRWMutex(4, 1, n)
HammerRWMutex(4, 3, n)
HammerRWMutex(4, 10, n)
HammerRWMutex(10, 1, n)
HammerRWMutex(10, 3, n)
HammerRWMutex(10, 10, n)
HammerRWMutex(10, 5, n)
}
// Borrowed from rwmutex_test.go
func TestDRLocker(t *testing.T) {
wl := NewLRWMutex()
var rl sync.Locker
wlocked := make(chan bool, 1)
rlocked := make(chan bool, 1)
rl = wl.DRLocker()
n := 10
go func() {
for i := 0; i < n; i++ {
rl.Lock()
rl.Lock()
rlocked <- true
wl.Lock()
wlocked <- true
}
}()
for i := 0; i < n; i++ {
<-rlocked
rl.Unlock()
select {
case <-wlocked:
t.Fatal("RLocker() didn't read-lock it")
default:
}
rl.Unlock()
<-wlocked
select {
case <-rlocked:
t.Fatal("RLocker() didn't respect the write lock")
default:
}
wl.Unlock()
}
}
// Borrowed from rwmutex_test.go
func TestUnlockPanic(t *testing.T) {
defer func() {
if recover() == nil {
t.Fatalf("unlock of unlocked RWMutex did not panic")
}
}()
mu := NewLRWMutex()
mu.Unlock()
}
// Borrowed from rwmutex_test.go
func TestUnlockPanic2(t *testing.T) {
defer func() {
if recover() == nil {
t.Fatalf("unlock of unlocked RWMutex did not panic")
}
}()
mu := NewLRWMutex()
mu.RLock()
mu.Unlock()
}
// Borrowed from rwmutex_test.go
func TestRUnlockPanic(t *testing.T) {
defer func() {
if recover() == nil {
t.Fatalf("read unlock of unlocked RWMutex did not panic")
}
}()
mu := NewLRWMutex()
mu.RUnlock()
}
// Borrowed from rwmutex_test.go
func TestRUnlockPanic2(t *testing.T) {
defer func() {
if recover() == nil {
t.Fatalf("read unlock of unlocked RWMutex did not panic")
}
}()
mu := NewLRWMutex()
mu.Lock()
mu.RUnlock()
}