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Add unit tests and an environment flag to enable the debugsync functi…
…onality
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,187 @@ | ||
| // Copyright 2009 The Go Authors. All rights reserved. | ||
| // Use of this source code is governed by a BSD-style | ||
| // license that can be found in the LICENSE file. | ||
|
|
||
| // GOMAXPROCS=10 go test | ||
|
|
||
| package debugsync | ||
|
|
||
| import ( | ||
| "fmt" | ||
|
|
||
| "os" | ||
| "os/exec" | ||
| "runtime" | ||
| "strings" | ||
| "testing" | ||
| "time" | ||
| ) | ||
|
|
||
| func HammerMutex(m *Mutex, loops int, cdone chan bool) { | ||
| for i := 0; i < loops; i++ { | ||
| if i%3 == 0 { | ||
| if m.TryLock() { | ||
| m.Unlock() | ||
| } | ||
| continue | ||
| } | ||
| m.Lock() | ||
| m.Unlock() | ||
| } | ||
| cdone <- true | ||
| } | ||
|
|
||
| func TestMutex(t *testing.T) { | ||
| if n := runtime.SetMutexProfileFraction(1); n != 0 { | ||
| t.Logf("got mutexrate %d expected 0", n) | ||
| } | ||
| defer runtime.SetMutexProfileFraction(0) | ||
|
|
||
| m := new(Mutex) | ||
|
|
||
| m.Lock() | ||
| if m.TryLock() { | ||
| t.Fatalf("TryLock succeeded with mutex locked") | ||
| } | ||
| m.Unlock() | ||
| if !m.TryLock() { | ||
| t.Fatalf("TryLock failed with mutex unlocked") | ||
| } | ||
| m.Unlock() | ||
|
|
||
| c := make(chan bool) | ||
| for i := 0; i < 10; i++ { | ||
| go HammerMutex(m, 1000, c) | ||
| } | ||
| for i := 0; i < 10; i++ { | ||
| <-c | ||
| } | ||
| } | ||
|
|
||
| var misuseTests = []struct { | ||
| name string | ||
| f func() | ||
| }{ | ||
| { | ||
| "Mutex.Unlock", | ||
| func() { | ||
| var mu Mutex | ||
| mu.Unlock() | ||
| }, | ||
| }, | ||
| { | ||
| "Mutex.Unlock2", | ||
| func() { | ||
| var mu Mutex | ||
| mu.Lock() | ||
| mu.Unlock() | ||
| mu.Unlock() | ||
| }, | ||
| }, | ||
| { | ||
| "RWMutex.Unlock", | ||
| func() { | ||
| var mu RWMutex | ||
| mu.Unlock() | ||
| }, | ||
| }, | ||
| { | ||
| "RWMutex.Unlock2", | ||
| func() { | ||
| var mu RWMutex | ||
| mu.RLock() | ||
| mu.Unlock() | ||
| }, | ||
| }, | ||
| { | ||
| "RWMutex.Unlock3", | ||
| func() { | ||
| var mu RWMutex | ||
| mu.Lock() | ||
| mu.Unlock() | ||
| mu.Unlock() | ||
| }, | ||
| }, | ||
| { | ||
| "RWMutex.RUnlock", | ||
| func() { | ||
| var mu RWMutex | ||
| mu.RUnlock() | ||
| }, | ||
| }, | ||
| { | ||
| "RWMutex.RUnlock2", | ||
| func() { | ||
| var mu RWMutex | ||
| mu.Lock() | ||
| mu.RUnlock() | ||
| }, | ||
| }, | ||
| { | ||
| "RWMutex.RUnlock3", | ||
| func() { | ||
| var mu RWMutex | ||
| mu.RLock() | ||
| mu.RUnlock() | ||
| mu.RUnlock() | ||
| }, | ||
| }, | ||
| } | ||
|
|
||
| func init() { | ||
| if len(os.Args) == 3 && os.Args[1] == "TESTMISUSE" { | ||
| for _, test := range misuseTests { | ||
| if test.name == os.Args[2] { | ||
| func() { | ||
| defer func() { recover() }() | ||
| test.f() | ||
| }() | ||
| fmt.Printf("test completed\n") | ||
| os.Exit(0) | ||
| } | ||
| } | ||
| fmt.Printf("unknown test\n") | ||
| os.Exit(0) | ||
| } | ||
| } | ||
|
|
||
| func TestMutexMisuse(t *testing.T) { | ||
| for _, test := range misuseTests { | ||
| out, err := exec.Command(os.Args[0], "TESTMISUSE", test.name).CombinedOutput() | ||
| if err == nil || !strings.Contains(string(out), "unlocked") { | ||
| t.Errorf("%s: did not find failure with message about unlocked lock: %s\n%s\n", test.name, err, out) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func TestMutexFairness(t *testing.T) { | ||
| var mu Mutex | ||
| stop := make(chan bool) | ||
| defer close(stop) | ||
| go func() { | ||
| for { | ||
| mu.Lock() | ||
| time.Sleep(100 * time.Microsecond) | ||
| mu.Unlock() | ||
| select { | ||
| case <-stop: | ||
| return | ||
| default: | ||
| } | ||
| } | ||
| }() | ||
| done := make(chan bool, 1) | ||
| go func() { | ||
| for i := 0; i < 10; i++ { | ||
| time.Sleep(100 * time.Microsecond) | ||
| mu.Lock() | ||
| mu.Unlock() | ||
| } | ||
| done <- true | ||
| }() | ||
| select { | ||
| case <-done: | ||
| case <-time.After(10 * time.Second): | ||
| t.Fatalf("can't acquire Mutex in 10 seconds") | ||
| } | ||
| } |
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