Vous ne pouvez pas sélectionner plus de 25 sujets
Les noms de sujets doivent commencer par une lettre ou un nombre, peuvent contenir des tirets ('-') et peuvent comporter jusqu'à 35 caractères.
39 lignes
1.1 KiB
39 lignes
1.1 KiB
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style license that can be
|
|
// found in the LICENSE file. See the AUTHORS file for names of contributors.
|
|
|
|
#ifndef STORAGE_LEVELDB_UTIL_MUTEXLOCK_H_
|
|
#define STORAGE_LEVELDB_UTIL_MUTEXLOCK_H_
|
|
|
|
#include "port/port.h"
|
|
#include "port/thread_annotations.h"
|
|
|
|
namespace leveldb {
|
|
|
|
// Helper class that locks a mutex on construction and unlocks the mutex when
|
|
// the destructor of the MutexLock object is invoked.
|
|
//
|
|
// Typical usage:
|
|
//
|
|
// void MyClass::MyMethod() {
|
|
// MutexLock l(&mu_); // mu_ is an instance variable
|
|
// ... some complex code, possibly with multiple return paths ...
|
|
// }
|
|
|
|
class SCOPED_LOCKABLE MutexLock {
|
|
public:
|
|
explicit MutexLock(port::Mutex* mu) EXCLUSIVE_LOCK_FUNCTION(mu) : mu_(mu) {
|
|
this->mu_->Lock();
|
|
}
|
|
~MutexLock() UNLOCK_FUNCTION() { this->mu_->Unlock(); }
|
|
|
|
MutexLock(const MutexLock&) = delete;
|
|
MutexLock& operator=(const MutexLock&) = delete;
|
|
|
|
private:
|
|
port::Mutex* const mu_;
|
|
};
|
|
|
|
} // namespace leveldb
|
|
|
|
#endif // STORAGE_LEVELDB_UTIL_MUTEXLOCK_H_
|