netwerk/wifi/nsWifiMonitor.cpp
author Mike Hommey <mh+mozilla@glandium.org>
Thu, 03 Jul 2014 07:15:31 +0900
changeset 192038 ce1c57e03b885eedfbe58a191e5306b17b04fc65
parent 190540 ef6cb0f76224810fdaf44cd4c5164ff552e0ade0
child 234933 ac4464790ec4896a5188fa50cfc69ae0ffeddc08
permissions -rw-r--r--
Bug 762358 - Re-run configure when mozconfig changed in a significant way. r=gps This adds a format option to mach environment and uses it in client.mk to create a .mozconfig.json in the objdir, containing all the relevant data from mozconfig. If the mozconfig doesn't change in a way that alters that data, we still skip configure. At the same time, use mach environment in place of mozconfig2configure and mozconfig2client-mk, which makes us now have only one mozconfig reader. Also, in the mozconfig reader, keep track of environment variables (as opposed to shell variables), so that changes such as a variable that was exported not being exported anymore is spotted. At the opposite, in order for irrelevant environment variable changes not to incur in re-running configure, only a set of environment variables are stored when they are unmodified. Otherwise, changes such as using a different terminal window, or even rebooting, would trigger reconfigures. Finally, make mach environment emit both MOZ_OBJDIR and OBJDIR for client.mk, and cleanup some objdir-related things in client.mk.. At the same time, make the mozconfig reader take MOZ_OBJDIR from the environment if it is defined there and not in the mozconfig.

/* 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 "nsCOMPtr.h"
#include "nsProxyRelease.h"
#include "nsComponentManagerUtils.h"
#include "nsServiceManagerUtils.h"
#include "nsThreadUtils.h"
#include "nsXPCOM.h"
#include "nsXPCOMCID.h"
#include "nsIObserver.h"
#include "nsIObserverService.h"
#include "nsWifiMonitor.h"
#include "nsWifiAccessPoint.h"

#include "nsServiceManagerUtils.h"
#include "nsComponentManagerUtils.h"
#include "mozilla/Services.h"

using namespace mozilla;

#if defined(PR_LOGGING)
PRLogModuleInfo *gWifiMonitorLog;
#endif

NS_IMPL_ISUPPORTS(nsWifiMonitor,
                  nsIRunnable,
                  nsIObserver,
                  nsIWifiMonitor)

nsWifiMonitor::nsWifiMonitor()
: mKeepGoing(true)
, mReentrantMonitor("nsWifiMonitor.mReentrantMonitor")
{
#if defined(PR_LOGGING)
  gWifiMonitorLog = PR_NewLogModule("WifiMonitor");
#endif

  nsCOMPtr<nsIObserverService> obsSvc = mozilla::services::GetObserverService();
  if (obsSvc)
    obsSvc->AddObserver(this, "xpcom-shutdown", false);

  LOG(("@@@@@ wifimonitor created\n"));
}

nsWifiMonitor::~nsWifiMonitor()
{
}

NS_IMETHODIMP
nsWifiMonitor::Observe(nsISupports *subject, const char *topic,
                     const char16_t *data)
{
  if (!strcmp(topic, "xpcom-shutdown")) {
    LOG(("Shutting down\n"));
    mKeepGoing = false;

    ReentrantMonitorAutoEnter mon(mReentrantMonitor);
    mon.Notify();
  }
  return NS_OK;
}


NS_IMETHODIMP nsWifiMonitor::StartWatching(nsIWifiListener *aListener)
{
  if (!aListener)
    return NS_ERROR_NULL_POINTER;

  nsresult rv = NS_OK;
  if (!mThread) {
    rv = NS_NewThread(getter_AddRefs(mThread), this);
    if (NS_FAILED(rv))
      return rv;
  }

  ReentrantMonitorAutoEnter mon(mReentrantMonitor);

  mKeepGoing = true;

  mListeners.AppendElement(nsWifiListener(new nsMainThreadPtrHolder<nsIWifiListener>(aListener)));

  // tell ourselves that we have a new watcher.
  mon.Notify();
  return NS_OK;
}

NS_IMETHODIMP nsWifiMonitor::StopWatching(nsIWifiListener *aListener)
{
  if (!aListener)
    return NS_ERROR_NULL_POINTER;

  LOG(("removing listener\n"));

  ReentrantMonitorAutoEnter mon(mReentrantMonitor);

  for (uint32_t i = 0; i < mListeners.Length(); i++) {

    if (mListeners[i].mListener == aListener) {
      mListeners.RemoveElementAt(i);
      break;
    }
  }

  if (mListeners.Length() == 0) {
    mKeepGoing = false;
    mon.Notify();
    mThread = nullptr;
  }

  return NS_OK;
}

typedef nsTArray<nsMainThreadPtrHandle<nsIWifiListener> > WifiListenerArray;

class nsPassErrorToWifiListeners MOZ_FINAL : public nsIRunnable
{
 public:
  NS_DECL_THREADSAFE_ISUPPORTS
  NS_DECL_NSIRUNNABLE

  nsPassErrorToWifiListeners(nsAutoPtr<WifiListenerArray> aListeners,
                             nsresult aResult)
  : mListeners(aListeners),
    mResult(aResult)
  {}

 private:
  ~nsPassErrorToWifiListeners() {}
  nsAutoPtr<WifiListenerArray> mListeners;
  nsresult mResult;
};

NS_IMPL_ISUPPORTS(nsPassErrorToWifiListeners,
                  nsIRunnable)

NS_IMETHODIMP nsPassErrorToWifiListeners::Run()
{
  LOG(("About to send error to the wifi listeners\n"));
  for (size_t i = 0; i < mListeners->Length(); i++) {
    (*mListeners)[i]->OnError(mResult);
  }
  return NS_OK;
}

NS_IMETHODIMP nsWifiMonitor::Run()
{
  LOG(("@@@@@ wifi monitor run called\n"));

  PR_SetCurrentThreadName("Wifi Monitor");

  nsresult rv = DoScan();

  if (mKeepGoing && NS_FAILED(rv)) {
    nsAutoPtr<WifiListenerArray> currentListeners(
                           new WifiListenerArray(mListeners.Length()));
    if (!currentListeners)
      return NS_ERROR_OUT_OF_MEMORY;

    for (uint32_t i = 0; i < mListeners.Length(); i++)
      currentListeners->AppendElement(mListeners[i].mListener);

    nsCOMPtr<nsIThread> thread = do_GetMainThread();
    if (!thread)
      return NS_ERROR_UNEXPECTED;

    nsCOMPtr<nsIRunnable> runnable(new nsPassErrorToWifiListeners(currentListeners, rv));
    if (!runnable)
      return NS_ERROR_OUT_OF_MEMORY;

    thread->Dispatch(runnable, NS_DISPATCH_SYNC);
  }

  return NS_OK;
}

class nsCallWifiListeners MOZ_FINAL : public nsIRunnable
{
 public:
  NS_DECL_THREADSAFE_ISUPPORTS
  NS_DECL_NSIRUNNABLE

  nsCallWifiListeners(nsAutoPtr<WifiListenerArray> aListeners,
                      nsAutoPtr<nsTArray<nsIWifiAccessPoint*> > aAccessPoints)
  : mListeners(aListeners),
    mAccessPoints(aAccessPoints)
  {}

 private:
  ~nsCallWifiListeners() {}
  nsAutoPtr<WifiListenerArray> mListeners;
  nsAutoPtr<nsTArray<nsIWifiAccessPoint*> > mAccessPoints;
};

NS_IMPL_ISUPPORTS(nsCallWifiListeners,
                  nsIRunnable)

NS_IMETHODIMP nsCallWifiListeners::Run()
{
  LOG(("About to send data to the wifi listeners\n"));
  for (size_t i = 0; i < mListeners->Length(); i++) {
    (*mListeners)[i]->OnChange(mAccessPoints->Elements(), mAccessPoints->Length());
  }
  return NS_OK;
}

nsresult
nsWifiMonitor::CallWifiListeners(const nsCOMArray<nsWifiAccessPoint> &aAccessPoints,
                                 bool aAccessPointsChanged)
{
    nsAutoPtr<WifiListenerArray> currentListeners(
                           new WifiListenerArray(mListeners.Length()));
    if (!currentListeners)
      return NS_ERROR_OUT_OF_MEMORY;

    {
      ReentrantMonitorAutoEnter mon(mReentrantMonitor);

      for (uint32_t i = 0; i < mListeners.Length(); i++) {
        if (!mListeners[i].mHasSentData || aAccessPointsChanged) {
          mListeners[i].mHasSentData = true;
          currentListeners->AppendElement(mListeners[i].mListener);
        }
      }
    }

    if (currentListeners->Length() > 0)
    {
      uint32_t resultCount = aAccessPoints.Count();
      nsAutoPtr<nsTArray<nsIWifiAccessPoint*> > accessPoints(
                               new nsTArray<nsIWifiAccessPoint *>(resultCount));
      if (!accessPoints)
        return NS_ERROR_OUT_OF_MEMORY;

      for (uint32_t i = 0; i < resultCount; i++)
        accessPoints->AppendElement(aAccessPoints[i]);

      nsCOMPtr<nsIThread> thread = do_GetMainThread();
      if (!thread)
        return NS_ERROR_UNEXPECTED;

      nsCOMPtr<nsIRunnable> runnable(
                      new nsCallWifiListeners(currentListeners, accessPoints));
      if (!runnable)
        return NS_ERROR_OUT_OF_MEMORY;

      thread->Dispatch(runnable, NS_DISPATCH_SYNC);
    }

    return NS_OK;
}