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// Copyright 2019 The gVisor Authors.
//
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package sync
import (
"sync"
"testing"
"unsafe"
)
// TestStructSize verifies that syncMutex's size hasn't drifted from the
// standard library's version.
//
// The correctness of this package relies on these remaining in sync.
func TestStructSize(t *testing.T) {
const (
got = unsafe.Sizeof(syncMutex{})
want = unsafe.Sizeof(sync.Mutex{})
)
if got != want {
t.Errorf("got sizeof(syncMutex) = %d, want = sizeof(sync.Mutex) = %d", got, want)
}
}
// TestFieldValues verifies that the semantics of syncMutex.state from the
// standard library's implementation.
//
// The correctness of this package relies on these remaining in sync.
func TestFieldValues(t *testing.T) {
var m Mutex
m.Lock()
if got := *m.m.state(); got != mutexLocked {
t.Errorf("got locked sync.Mutex.state = %d, want = %d", got, mutexLocked)
}
m.Unlock()
if got := *m.m.state(); got != mutexUnlocked {
t.Errorf("got unlocked sync.Mutex.state = %d, want = %d", got, mutexUnlocked)
}
}
func TestDoubleTryLock(t *testing.T) {
var m Mutex
if !m.TryLock() {
t.Fatal("failed to aquire lock")
}
if m.TryLock() {
t.Fatal("unexpectedly succeeded in aquiring locked mutex")
}
}
func TestTryLockAfterLock(t *testing.T) {
var m Mutex
m.Lock()
if m.TryLock() {
t.Fatal("unexpectedly succeeded in aquiring locked mutex")
}
}
func TestTryLockUnlock(t *testing.T) {
var m Mutex
if !m.TryLock() {
t.Fatal("failed to aquire lock")
}
m.Unlock()
if !m.TryLock() {
t.Fatal("failed to aquire lock after unlock")
}
}
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