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// Copyright 2015 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 CONTENT_PUBLIC_CHILD_WORKER_THREAD_H_
#define CONTENT_PUBLIC_CHILD_WORKER_THREAD_H_
#include "base/callback.h"
#include "base/macros.h"
#include "content/common/content_export.h"
namespace content {
// Utility functions for worker threads, for example service worker threads.
//
// This allows getting the thread IDs for service worker threads, then later
// posting tasks back to them.
class CONTENT_EXPORT WorkerThread {
public:
// Observes worker thread lifetime.
class CONTENT_EXPORT Observer {
public:
virtual ~Observer() {}
// Notifies the observer that the current worker thread is about to be
// stopped.
//
// The worker state may have already been destroyed. To observe that, use
// ContentRendererClient::WillDestroyServiceWorkerContextOnWorkerThread.
virtual void WillStopCurrentWorkerThread() {}
};
// Adds/removes an Observer. Observers are stored per-thread, so it is only
// valid to call these from a worker thread, and events will be dispatched on
// that worker's thread.
static void AddObserver(Observer* observer);
static void RemoveObserver(Observer* observer);
// Returns the thread ID for the current worker thread, or 0 if this is not a
// worker thread (for example, the render thread). Worker thread IDs will
// always be > 0.
static int GetCurrentId();
// Posts a task to the worker thread with ID |id|. ID must be > 0.
static void PostTask(int id, const base::Closure& task);
private:
WorkerThread(){};
DISALLOW_COPY_AND_ASSIGN(WorkerThread);
};
} // namespace content
#endif // CONTENT_PUBLIC_CHILD_WORKER_THREAD_H_