/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsCache.h"
#include "nsCacheUtils.h"
#include "nsThreadUtils.h"

using namespace mozilla;

class nsDestroyThreadEvent : public Runnable {
public:
  explicit nsDestroyThreadEvent(nsIThread *thread)
    : mThread(thread)
  {}
  NS_IMETHOD Run() override
  {
    mThread->Shutdown();
    return NS_OK;
  }
private:
  nsCOMPtr<nsIThread> mThread;
};

nsShutdownThread::nsShutdownThread(nsIThread *aThread)
  : mMonitor("nsShutdownThread.mMonitor")
  , mShuttingDown(false)
  , mThread(aThread)
{
}

nsShutdownThread::~nsShutdownThread()
{
}

nsresult
nsShutdownThread::Shutdown(nsIThread *aThread)
{
  nsresult rv;
  RefPtr<nsDestroyThreadEvent> ev = new nsDestroyThreadEvent(aThread);
  rv = NS_DispatchToMainThread(ev);
  if (NS_FAILED(rv)) {
    NS_WARNING("Dispatching event in nsShutdownThread::Shutdown failed!");
  }
  return rv;
}

nsresult
nsShutdownThread::BlockingShutdown(nsIThread *aThread)
{
  nsresult rv;

  RefPtr<nsShutdownThread> st = new nsShutdownThread(aThread);
  nsCOMPtr<nsIThread> workerThread;

  rv = NS_NewNamedThread("thread shutdown", getter_AddRefs(workerThread));
  if (NS_FAILED(rv)) {
    NS_WARNING("Can't create nsShutDownThread worker thread!");
    return rv;
  }

  {
    MonitorAutoLock mon(st->mMonitor);
    rv = workerThread->Dispatch(st, NS_DISPATCH_NORMAL);
    if (NS_FAILED(rv)) {
      NS_WARNING(
        "Dispatching event in nsShutdownThread::BlockingShutdown failed!");
    } else {
      st->mShuttingDown = true;
      while (st->mShuttingDown) {
        mon.Wait();
      }
    }
  }

  return Shutdown(workerThread);
}

NS_IMETHODIMP
nsShutdownThread::Run()
{
  MonitorAutoLock mon(mMonitor);
  mThread->Shutdown();
  mShuttingDown = false;
  mon.Notify();
  return NS_OK;
}
