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41 строки
1.1 KiB
41 строки
1.1 KiB
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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#ifndef STORAGE_LEVELDB_UTIL_MUTEXLOCK_H_
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#define STORAGE_LEVELDB_UTIL_MUTEXLOCK_H_
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#include "port/port.h"
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#include "port/thread_annotations.h"
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namespace leveldb {
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// Helper class that locks a mutex on construction and unlocks the mutex when
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// the destructor of the MutexLock object is invoked.
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//
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// Typical usage:
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//
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// void MyClass::MyMethod() {
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// MutexLock l(&mu_); // mu_ is an instance variable
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// ... some complex code, possibly with multiple return paths ...
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// }
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class SCOPED_LOCKABLE MutexLock {
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public:
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explicit MutexLock(port::Mutex *mu) EXCLUSIVE_LOCK_FUNCTION(mu)
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: mu_(mu) {
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this->mu_->Lock();
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}
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~MutexLock() UNLOCK_FUNCTION() { this->mu_->Unlock(); }
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private:
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port::Mutex *const mu_;
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// No copying allowed
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MutexLock(const MutexLock&);
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void operator=(const MutexLock&);
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};
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} // namespace leveldb
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#endif // STORAGE_LEVELDB_UTIL_MUTEXLOCK_H_
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