| // 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 CHROME_BROWSER_ANDROID_PROVIDER_RUN_ON_UI_THREAD_BLOCKING_H_ |
| #define CHROME_BROWSER_ANDROID_PROVIDER_RUN_ON_UI_THREAD_BLOCKING_H_ |
| |
| #include "base/bind.h" |
| #include "base/callback.h" |
| #include "base/synchronization/waitable_event.h" |
| #include "content/public/browser/browser_thread.h" |
| |
| // Runs code synchronously on the UI thread. Should never be called directly |
| // from the UI thread. To be used only within the provider classes. |
| class RunOnUIThreadBlocking { |
| public: |
| // Runs the provided runnable in the UI thread synchronously. |
| // The runnable argument can be defined using base::Bind. |
| template <typename Signature> |
| static void Run(base::Callback<Signature> runnable) { |
| DCHECK(!content::BrowserThread::CurrentlyOn(content::BrowserThread::UI)); |
| base::WaitableEvent finished(false, false); |
| content::BrowserThread::PostTask(content::BrowserThread::UI, FROM_HERE, |
| base::Bind(&RunOnUIThreadBlocking::RunOnUIThread<Signature>, |
| runnable, &finished)); |
| finished.Wait(); |
| } |
| |
| private: |
| template <typename Signature> |
| static void RunOnUIThread(base::Callback<Signature> runnable, |
| base::WaitableEvent* finished) { |
| DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI)); |
| runnable.Run(); |
| finished->Signal(); |
| } |
| }; |
| |
| #endif // CHROME_BROWSER_ANDROID_PROVIDER_RUN_ON_UI_THREAD_BLOCKING_H_ |