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// Copyright (C) 2015 The Syncthing Authors.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at http://mozilla.org/MPL/2.0/.
package sync
import (
"strings"
"sync"
"testing"
"time"
"github.com/syncthing/syncthing/lib/logger"
)
const (
logThreshold = 100 * time.Millisecond
shortWait = 5 * time.Millisecond
longWait = 125 * time.Millisecond
)
var skipTimingTests = false
func init() {
// Check a few times that a short sleep does not in fact overrun the log
// threshold. If it does, the timer accuracy is crap or the host is
// overloaded and we can't reliably run the tests in here. In the normal
// case this takes just 25*5 = 125 ms.
for i := 0; i < 25; i++ {
t0 := time.Now()
time.Sleep(shortWait)
if time.Since(t0) > logThreshold {
skipTimingTests = true
return
}
}
}
func TestTypes(t *testing.T) {
debug = false
l.SetDebug("sync", false)
if _, ok := NewMutex().(*sync.Mutex); !ok {
t.Error("Wrong type")
}
if _, ok := NewRWMutex().(*sync.RWMutex); !ok {
t.Error("Wrong type")
}
if _, ok := NewWaitGroup().(*sync.WaitGroup); !ok {
t.Error("Wrong type")
}
debug = true
l.SetDebug("sync", true)
if _, ok := NewMutex().(*loggedMutex); !ok {
t.Error("Wrong type")
}
if _, ok := NewRWMutex().(*loggedRWMutex); !ok {
t.Error("Wrong type")
}
if _, ok := NewWaitGroup().(*loggedWaitGroup); !ok {
t.Error("Wrong type")
}
debug = false
l.SetDebug("sync", false)
}
func TestMutex(t *testing.T) {
if skipTimingTests {
t.Skip("insufficient timer accuracy")
return
}
debug = true
l.SetDebug("sync", true)
threshold = logThreshold
msgmut := sync.Mutex{}
var messages []string
l.AddHandler(logger.LevelDebug, func(_ logger.LogLevel, message string) {
msgmut.Lock()
messages = append(messages, message)
msgmut.Unlock()
})
mut := NewMutex()
mut.Lock()
time.Sleep(shortWait)
mut.Unlock()
if len(messages) > 0 {
t.Errorf("Unexpected message count")
}
mut.Lock()
time.Sleep(longWait)
mut.Unlock()
if len(messages) != 1 {
t.Errorf("Unexpected message count")
}
debug = false
l.SetDebug("sync", false)
}
func TestRWMutex(t *testing.T) {
if skipTimingTests {
t.Skip("insufficient timer accuracy")
return
}
debug = true
l.SetDebug("sync", true)
threshold = logThreshold
msgmut := sync.Mutex{}
var messages []string
l.AddHandler(logger.LevelDebug, func(_ logger.LogLevel, message string) {
msgmut.Lock()
messages = append(messages, message)
msgmut.Unlock()
})
mut := NewRWMutex()
mut.Lock()
time.Sleep(shortWait)
mut.Unlock()
if len(messages) > 0 {
t.Errorf("Unexpected message count")
}
mut.Lock()
time.Sleep(longWait)
mut.Unlock()
if len(messages) != 1 {
t.Errorf("Unexpected message count")
}
// Testing rlocker logging
mut.RLock()
go func() {
time.Sleep(longWait)
mut.RUnlock()
}()
mut.Lock()
_ = 1 // skip empty critical section check
mut.Unlock()
if len(messages) != 2 {
t.Errorf("Unexpected message count")
}
if !strings.Contains(messages[1], "RUnlockers while locking:\nat sync") || !strings.Contains(messages[1], "sync_test.go:") {
t.Error("Unexpected message")
}
// Testing multiple rlockers
mut.RLock()
mut.RLock()
mut.RLock()
_ = 1 // skip empty critical section check
mut.RUnlock()
mut.RUnlock()
mut.RUnlock()
debug = false
l.SetDebug("sync", false)
}
func TestWaitGroup(t *testing.T) {
if skipTimingTests {
t.Skip("insufficient timer accuracy")
return
}
debug = true
l.SetDebug("sync", true)
threshold = logThreshold
msgmut := sync.Mutex{}
var messages []string
l.AddHandler(logger.LevelDebug, func(_ logger.LogLevel, message string) {
msgmut.Lock()
messages = append(messages, message)
msgmut.Unlock()
})
wg := NewWaitGroup()
wg.Add(1)
go func() {
time.Sleep(shortWait)
wg.Done()
}()
wg.Wait()
if len(messages) > 0 {
t.Errorf("Unexpected message count")
}
wg = NewWaitGroup()
wg.Add(1)
go func() {
time.Sleep(longWait)
wg.Done()
}()
wg.Wait()
if len(messages) != 1 {
t.Errorf("Unexpected message count")
}
debug = false
l.SetDebug("sync", false)
}
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