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Unified Diff: base/lock_ptr.h

Issue 624713003: Keep only base/extractor.[cc|h]. (Closed) Base URL: https://chromium.googlesource.com/external/omaha.git@master
Patch Set: Created 6 years, 2 months ago
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Index: base/lock_ptr.h
diff --git a/base/lock_ptr.h b/base/lock_ptr.h
deleted file mode 100644
index 74c424ab66de12ea49d638b1c20d8d17a263ce59..0000000000000000000000000000000000000000
--- a/base/lock_ptr.h
+++ /dev/null
@@ -1,128 +0,0 @@
-// Copyright 2003-2009 Google Inc.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-// ========================================================================
-//
-// lock_ptr.h
-//
-// A smart pointer to manage synchronized access to a shared resource.
-//
-// LockPtr provides a simple and concise syntax for accessing a
-// shared resource. The LockPtr is a smart pointer and provides
-// pointer operators -> and *. LockPtr does not have copy semantics and it is
-// not intended to be stored in containers. Instead, instances of LockPtr are
-// usually unamed or short-lived named variables.
-//
-// LockPtr uses an external lock, it acquires the lock in the constructor, and
-// it guarantees the lock is released in the destructor.
-//
-// Since different types of locks have different method names, such as
-// Enter/Exit or Lock/Unlock, etc, LockPtr uses an external customizable policy
-// to bind to different operations. The external policy is a set of template
-// functions that can be specialized for different types of locks, if needed.
-// Think of this policy as an adapter between the lock type and the LockPtr.
-//
-// Usage: let's assume that we have the type below:
-//
-// class X {
-// public:
-// X() : i_(0) {}
-// void f() {}
-//
-// private:
-// int i_;
-//
-// friend int LockPtrTest(int, int);
-// };
-//
-// We have an instance of this type and an external lock instance to serialize
-// the access to the X instance.
-//
-// Using LockPtr, the code is:
-//
-// X x;
-// LLock local_lock;
-//
-// LockPtr<X>(x, local_lock)->f();
-//
-// For more example, please see the unit test of the module.
-
-
-
-#ifndef OMAHA_COMMON_LOCK_PTR_H_
-#define OMAHA_COMMON_LOCK_PTR_H_
-
-#include "omaha/base/debug.h"
-
-namespace omaha {
-
-template <typename T>
-class LockPtr {
- public:
- template <typename U>
- LockPtr(T& obj, U& lock)
- : pobj_(&obj),
- plock_(&lock),
- punlock_method_(&LockPtr::Unlock<U>) {
- AcquireLock(lock);
- }
-
- ~LockPtr() {
- ASSERT1(punlock_method_);
- (this->*punlock_method_)();
- }
-
- // Pointer behavior
- T& operator*() {
- ASSERT1(pobj_);
- return *pobj_;
- }
-
- T* operator->() {
- return pobj_;
- }
-
- private:
- // template method to restore the type of the lock and to call the
- // release policy for the lock
- template <class U>
- void Unlock() {
- ASSERT1(plock_);
- U& lock = *(static_cast<U*>(plock_));
- ReleaseLock(lock);
- }
-
- T* pobj_; // managed shared object
- void* plock_; // type-less lock to control access to pobj_
-
- void (LockPtr::*punlock_method_)(); // the address of the method to Unlock
-
- DISALLOW_EVIL_CONSTRUCTORS(LockPtr);
-};
-
-// template functions to define the policy of acquiring and releasing
-// the locks.
-template <class Lock> inline void AcquireLock(Lock& lock) { lock.Lock(); }
-template <class Lock> inline void ReleaseLock(Lock& lock) { lock.Unlock(); }
-
-// specialization of policy for diferent types of locks.
-#include "omaha/base/synchronized.h"
-template <> void inline AcquireLock(CriticalSection& cs) { cs.Enter(); }
-template <> void inline ReleaseLock(CriticalSection& cs) { cs.Exit(); }
-
-// Add more policy specializations below, if needed.
-
-} // namespace omaha
-
-#endif // OMAHA_COMMON_LOCK_PTR_H_
-
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