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authorwolfbeast <mcwerewolf@gmail.com>2018-05-03 05:55:15 +0200
committerwolfbeast <mcwerewolf@gmail.com>2018-05-03 05:55:15 +0200
commit43f7a588f96aaf88e7b69441c3b50bc9c7b20df7 (patch)
tree07d9b26b2f357ee9de04fea0e5e4b8b9a1ff93a4 /security/sandbox/chromium/base/task_runner.h
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Nuke the sandbox
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-// 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_TASK_RUNNER_H_
-#define BASE_TASK_RUNNER_H_
-
-#include <stddef.h>
-
-#include "base/base_export.h"
-#include "base/callback_forward.h"
-#include "base/memory/ref_counted.h"
-#include "base/time/time.h"
-
-namespace tracked_objects {
-class Location;
-} // namespace tracked_objects
-
-namespace base {
-
-struct TaskRunnerTraits;
-
-// A TaskRunner is an object that runs posted tasks (in the form of
-// Closure objects). The TaskRunner interface provides a way of
-// decoupling task posting from the mechanics of how each task will be
-// run. TaskRunner provides very weak guarantees as to how posted
-// tasks are run (or if they're run at all). In particular, it only
-// guarantees:
-//
-// - Posting a task will not run it synchronously. That is, no
-// Post*Task method will call task.Run() directly.
-//
-// - Increasing the delay can only delay when the task gets run.
-// That is, increasing the delay may not affect when the task gets
-// run, or it could make it run later than it normally would, but
-// it won't make it run earlier than it normally would.
-//
-// TaskRunner does not guarantee the order in which posted tasks are
-// run, whether tasks overlap, or whether they're run on a particular
-// thread. Also it does not guarantee a memory model for shared data
-// between tasks. (In other words, you should use your own
-// synchronization/locking primitives if you need to share data
-// between tasks.)
-//
-// Implementations of TaskRunner should be thread-safe in that all
-// methods must be safe to call on any thread. Ownership semantics
-// for TaskRunners are in general not clear, which is why the
-// interface itself is RefCountedThreadSafe.
-//
-// Some theoretical implementations of TaskRunner:
-//
-// - A TaskRunner that uses a thread pool to run posted tasks.
-//
-// - A TaskRunner that, for each task, spawns a non-joinable thread
-// to run that task and immediately quit.
-//
-// - A TaskRunner that stores the list of posted tasks and has a
-// method Run() that runs each runnable task in random order.
-class BASE_EXPORT TaskRunner
- : public RefCountedThreadSafe<TaskRunner, TaskRunnerTraits> {
- public:
- // Posts the given task to be run. Returns true if the task may be
- // run at some point in the future, and false if the task definitely
- // will not be run.
- //
- // Equivalent to PostDelayedTask(from_here, task, 0).
- bool PostTask(const tracked_objects::Location& from_here,
- const Closure& task);
-
- // Like PostTask, but tries to run the posted task only after
- // |delay_ms| has passed.
- //
- // It is valid for an implementation to ignore |delay_ms|; that is,
- // to have PostDelayedTask behave the same as PostTask.
- virtual bool PostDelayedTask(const tracked_objects::Location& from_here,
- const Closure& task,
- base::TimeDelta delay) = 0;
-
- // Returns true if the current thread is a thread on which a task
- // may be run, and false if no task will be run on the current
- // thread.
- //
- // It is valid for an implementation to always return true, or in
- // general to use 'true' as a default value.
- virtual bool RunsTasksOnCurrentThread() const = 0;
-
- // Posts |task| on the current TaskRunner. On completion, |reply|
- // is posted to the thread that called PostTaskAndReply(). Both
- // |task| and |reply| are guaranteed to be deleted on the thread
- // from which PostTaskAndReply() is invoked. This allows objects
- // that must be deleted on the originating thread to be bound into
- // the |task| and |reply| Closures. In particular, it can be useful
- // to use WeakPtr<> in the |reply| Closure so that the reply
- // operation can be canceled. See the following pseudo-code:
- //
- // class DataBuffer : public RefCountedThreadSafe<DataBuffer> {
- // public:
- // // Called to add data into a buffer.
- // void AddData(void* buf, size_t length);
- // ...
- // };
- //
- //
- // class DataLoader : public SupportsWeakPtr<DataLoader> {
- // public:
- // void GetData() {
- // scoped_refptr<DataBuffer> buffer = new DataBuffer();
- // target_thread_.task_runner()->PostTaskAndReply(
- // FROM_HERE,
- // base::Bind(&DataBuffer::AddData, buffer),
- // base::Bind(&DataLoader::OnDataReceived, AsWeakPtr(), buffer));
- // }
- //
- // private:
- // void OnDataReceived(scoped_refptr<DataBuffer> buffer) {
- // // Do something with buffer.
- // }
- // };
- //
- //
- // Things to notice:
- // * Results of |task| are shared with |reply| by binding a shared argument
- // (a DataBuffer instance).
- // * The DataLoader object has no special thread safety.
- // * The DataLoader object can be deleted while |task| is still running,
- // and the reply will cancel itself safely because it is bound to a
- // WeakPtr<>.
- bool PostTaskAndReply(const tracked_objects::Location& from_here,
- const Closure& task,
- const Closure& reply);
-
- protected:
- friend struct TaskRunnerTraits;
-
- // Only the Windows debug build seems to need this: see
- // http://crbug.com/112250.
- friend class RefCountedThreadSafe<TaskRunner, TaskRunnerTraits>;
-
- TaskRunner();
- virtual ~TaskRunner();
-
- // Called when this object should be destroyed. By default simply
- // deletes |this|, but can be overridden to do something else, like
- // delete on a certain thread.
- virtual void OnDestruct() const;
-};
-
-struct BASE_EXPORT TaskRunnerTraits {
- static void Destruct(const TaskRunner* task_runner);
-};
-
-} // namespace base
-
-#endif // BASE_TASK_RUNNER_H_