The Tor Browser: security/sandbox/chromium/base/sequenced_task_runner

security/sandbox/chromium/base/sequenced_task_runner_helpers.h@141e0f1194b1 (annotated)

security/sandbox/chromium/base/sequenced_task_runner_helpers.h

Wed, 31 Dec 2014 07:16:47 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 07:16:47 +0100
branch: TOR_BUG_9701
changeset 3: 141e0f1194b1
permissions: -rw-r--r--

Revert simplistic fix pending revisit of Mozilla integration attempt.

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 #ifndef BASE_SEQUENCED_TASK_RUNNER_HELPERS_H_
 #define BASE_SEQUENCED_TASK_RUNNER_HELPERS_H_
 #include "base/basictypes.h"
 // TODO(akalin): Investigate whether it's possible to just have
 // SequencedTaskRunner use these helpers (instead of MessageLoop).
 // Then we can just move these to sequenced_task_runner.h.
 namespace tracked_objects {
 class Location;
 }
 namespace base {
 namespace subtle {
 template <class T, class R> class DeleteHelperInternal;
 template <class T, class R> class ReleaseHelperInternal;
 }
 // Template helpers which use function indirection to erase T from the
 // function signature while still remembering it so we can call the
 // correct destructor/release function.
 //
 // We use this trick so we don't need to include bind.h in a header
 // file like sequenced_task_runner.h. We also wrap the helpers in a
 // templated class to make it easier for users of DeleteSoon to
 // declare the helper as a friend.
 template <class T>
 class DeleteHelper {
  private:
   template <class T2, class R> friend class subtle::DeleteHelperInternal;
   static void DoDelete(const void* object) {
     delete reinterpret_cast<const T*>(object);
   }
   DISALLOW_COPY_AND_ASSIGN(DeleteHelper);
 };
 template <class T>
 class ReleaseHelper {
  private:
   template <class T2, class R> friend class subtle::ReleaseHelperInternal;
   static void DoRelease(const void* object) {
     reinterpret_cast<const T*>(object)->Release();
   }
   DISALLOW_COPY_AND_ASSIGN(ReleaseHelper);
 };
 namespace subtle {
 // An internal SequencedTaskRunner-like class helper for DeleteHelper
 // and ReleaseHelper.  We don't want to expose the Do*() functions
 // directly directly since the void* argument makes it possible to
 // pass/ an object of the wrong type to delete.  Instead, we force
 // callers to go through these internal helpers for type
 // safety. SequencedTaskRunner-like classes which expose DeleteSoon or
 // ReleaseSoon methods should friend the appropriate helper and
 // implement a corresponding *Internal method with the following
 // signature:
 //
 // bool(const tracked_objects::Location&,
 //      void(*function)(const void*),
 //      void* object)
 //
 // An implementation of this function should simply create a
 // base::Closure from (function, object) and return the result of
 // posting the task.
 template <class T, class ReturnType>
 class DeleteHelperInternal {
  public:
   template <class SequencedTaskRunnerType>
   static ReturnType DeleteViaSequencedTaskRunner(
       SequencedTaskRunnerType* sequenced_task_runner,
       const tracked_objects::Location& from_here,
       const T* object) {
     return sequenced_task_runner->DeleteSoonInternal(
         from_here, &DeleteHelper<T>::DoDelete, object);
   }
  private:
   DISALLOW_COPY_AND_ASSIGN(DeleteHelperInternal);
 };
 template <class T, class ReturnType>
 class ReleaseHelperInternal {
  public:
   template <class SequencedTaskRunnerType>
   static ReturnType ReleaseViaSequencedTaskRunner(
       SequencedTaskRunnerType* sequenced_task_runner,
       const tracked_objects::Location& from_here,
       const T* object) {
     return sequenced_task_runner->ReleaseSoonInternal(
         from_here, &ReleaseHelper<T>::DoRelease, object);
   }
  private:
   DISALLOW_COPY_AND_ASSIGN(ReleaseHelperInternal);
 };
 }  // namespace subtle
 }  // namespace base
 #endif  // BASE_SEQUENCED_TASK_RUNNER_HELPERS_H_

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security/sandbox/chromium/base/sequenced_task_runner_helpers.h@141e0f1194b1 (annotated)

security/sandbox/chromium/base/sequenced_task_runner_helpers.h