The Tor Browser: dom/ipc/ProcessPriorityManager.cpp@7e26c7da4463 (annotated)

dom/ipc/ProcessPriorityManager.cpp@7e26c7da4463 (annotated)

dom/ipc/ProcessPriorityManager.cpp

Wed, 31 Dec 2014 06:55:50 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:55:50 +0100
changeset 2: 7e26c7da4463
permissions: -rw-r--r--

Added tag UPSTREAM_283F7C6 for changeset ca08bd8f51b2

 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* vim: set sw=2 ts=8 et ft=cpp : */
 /* 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 "ProcessPriorityManager.h"
 #include "mozilla/ClearOnShutdown.h"
 #include "mozilla/dom/ContentParent.h"
 #include "mozilla/dom/Element.h"
 #include "mozilla/dom/TabParent.h"
 #include "mozilla/Hal.h"
 #include "mozilla/Preferences.h"
 #include "mozilla/Services.h"
 #include "mozilla/unused.h"
 #include "AudioChannelService.h"
 #include "prlog.h"
 #include "nsPrintfCString.h"
 #include "nsXULAppAPI.h"
 #include "nsIFrameLoader.h"
 #include "nsIObserverService.h"
 #include "StaticPtr.h"
 #include "nsIMozBrowserFrame.h"
 #include "nsIObserver.h"
 #include "nsITimer.h"
 #include "nsIPropertyBag2.h"
 #include "nsComponentManagerUtils.h"
 #ifdef XP_WIN
 #include <process.h>
 #define getpid _getpid
 #else
 #include <unistd.h>
 #endif
 #ifdef LOG
 #undef LOG
 #endif
 // Use LOGP inside a ParticularProcessPriorityManager method; use LOG
 // everywhere else.  LOGP prints out information about the particular process
 // priority manager.
 //
 // (Wow, our logging story is a huge mess.)
 // #define ENABLE_LOGGING 1
 #if defined(ANDROID) && defined(ENABLE_LOGGING)
 #  include <android/log.h>
 #  define LOG(fmt, ...) \
      __android_log_print(ANDROID_LOG_INFO, \
        "Gecko:ProcessPriorityManager", \
        fmt, ## __VA_ARGS__)
 #  define LOGP(fmt, ...) \
     __android_log_print(ANDROID_LOG_INFO, \
       "Gecko:ProcessPriorityManager", \
       "[%schild-id=%llu, pid=%d] " fmt, \
       NameWithComma().get(), \
       (long long unsigned) ChildID(), Pid(), ## __VA_ARGS__)
 #elif defined(ENABLE_LOGGING)
 #  define LOG(fmt, ...) \
      printf("ProcessPriorityManager - " fmt "\n", ##__VA_ARGS__)
 #  define LOGP(fmt, ...) \
      printf("ProcessPriorityManager[%schild-id=%llu, pid=%d] - " fmt "\n", \
        NameWithComma().get(), \
        (unsigned long long) ChildID(), Pid(), ##__VA_ARGS__)
 #elif defined(PR_LOGGING)
   static PRLogModuleInfo*
   GetPPMLog()
   {
     static PRLogModuleInfo *sLog;
     if (!sLog)
       sLog = PR_NewLogModule("ProcessPriorityManager");
     return sLog;
   }
 #  define LOG(fmt, ...) \
      PR_LOG(GetPPMLog(), PR_LOG_DEBUG, \
             ("ProcessPriorityManager - " fmt, ##__VA_ARGS__))
 #  define LOGP(fmt, ...) \
      PR_LOG(GetPPMLog(), PR_LOG_DEBUG, \
             ("ProcessPriorityManager[%schild-id=%llu, pid=%d] - " fmt, \
             NameWithComma().get(), \
             (unsigned long long) ChildID(), Pid(), ##__VA_ARGS__))
 #else
 #define LOG(fmt, ...)
 #define LOGP(fmt, ...)
 #endif
 using namespace mozilla;
 using namespace mozilla::dom;
 using namespace mozilla::hal;
 namespace {
 class ParticularProcessPriorityManager;
 /**
  * This singleton class does the work to implement the process priority manager
  * in the main process.  This class may not be used in child processes.  (You
  * can call StaticInit, but it won't do anything, and GetSingleton() will
  * return null.)
  *
  * ProcessPriorityManager::CurrentProcessIsForeground() and
  * ProcessPriorityManager::AnyProcessHasHighPriority() which can be called in
  * any process, are handled separately, by the ProcessPriorityManagerChild
  * class.
  */
 class ProcessPriorityManagerImpl MOZ_FINAL
   : public nsIObserver
 {
 public:
   /**
    * If we're in the main process, get the ProcessPriorityManagerImpl
    * singleton.  If we're in a child process, return null.
    */
   static ProcessPriorityManagerImpl* GetSingleton();
   static void StaticInit();
   static bool PrefsEnabled();
   NS_DECL_ISUPPORTS
   NS_DECL_NSIOBSERVER
   /**
    * This function implements ProcessPriorityManager::SetProcessPriority.
    */
   void SetProcessPriority(ContentParent* aContentParent,
                           ProcessPriority aPriority,
                           uint32_t aBackgroundLRU = 0);
   /**
    * If a magic testing-only pref is set, notify the observer service on the
    * given topic with the given data.  This is used for testing
    */
   void FireTestOnlyObserverNotification(const char* aTopic,
                                         const nsACString& aData = EmptyCString());
   /**
    * Does some process, other than the one handled by aParticularManager, have
    * priority FOREGROUND_HIGH?
    */
   bool OtherProcessHasHighPriority(
     ParticularProcessPriorityManager* aParticularManager);
   /**
    * Does one of the child processes have priority FOREGROUND_HIGH?
    */
   bool ChildProcessHasHighPriority();
   /**
    * This must be called by a ParticularProcessPriorityManager when it changes
    * its priority.
    */
   void NotifyProcessPriorityChanged(
     ParticularProcessPriorityManager* aParticularManager,
     hal::ProcessPriority aOldPriority);
 private:
   static bool sPrefListenersRegistered;
   static bool sInitialized;
   static StaticRefPtr<ProcessPriorityManagerImpl> sSingleton;
   static void PrefChangedCallback(const char* aPref, void* aClosure);
   ProcessPriorityManagerImpl();
   ~ProcessPriorityManagerImpl() {}
   DISALLOW_EVIL_CONSTRUCTORS(ProcessPriorityManagerImpl);
   void Init();
   already_AddRefed<ParticularProcessPriorityManager>
   GetParticularProcessPriorityManager(ContentParent* aContentParent);
   void ObserveContentParentCreated(nsISupports* aContentParent);
   void ObserveContentParentDestroyed(nsISupports* aSubject);
   nsDataHashtable<nsUint64HashKey, nsRefPtr<ParticularProcessPriorityManager> >
     mParticularManagers;
   nsTHashtable<nsUint64HashKey> mHighPriorityChildIDs;
 };
 /**
  * This singleton class implements the parts of the process priority manager
  * that are available from all processes.
  */
 class ProcessPriorityManagerChild MOZ_FINAL
   : public nsIObserver
 {
 public:
   static void StaticInit();
   static ProcessPriorityManagerChild* Singleton();
   NS_DECL_ISUPPORTS
   NS_DECL_NSIOBSERVER
   bool CurrentProcessIsForeground();
   bool CurrentProcessIsHighPriority();
 private:
   static StaticRefPtr<ProcessPriorityManagerChild> sSingleton;
   ProcessPriorityManagerChild();
   ~ProcessPriorityManagerChild() {}
   DISALLOW_EVIL_CONSTRUCTORS(ProcessPriorityManagerChild);
   void Init();
   hal::ProcessPriority mCachedPriority;
 };
 /**
  * This class manages the priority of one particular process.  It is
  * main-process only.
  */
 class ParticularProcessPriorityManager MOZ_FINAL
   : public WakeLockObserver
   , public nsIObserver
   , public nsITimerCallback
   , public nsSupportsWeakReference
 {
 public:
   ParticularProcessPriorityManager(ContentParent* aContentParent);
   ~ParticularProcessPriorityManager();
   NS_DECL_ISUPPORTS
   NS_DECL_NSIOBSERVER
   NS_DECL_NSITIMERCALLBACK
   virtual void Notify(const WakeLockInformation& aInfo) MOZ_OVERRIDE;
   void Init();
   int32_t Pid() const;
   uint64_t ChildID() const;
   bool IsPreallocated() const;
   /**
    * Used in logging, this method returns the ContentParent's name followed by
    * ", ".  If we can't get the ContentParent's name for some reason, it
    * returns an empty string.
    *
    * The reference returned here is guaranteed to be live until the next call
    * to NameWithComma() or until the ParticularProcessPriorityManager is
    * destroyed, whichever comes first.
    */
   const nsAutoCString& NameWithComma();
   bool HasAppType(const char* aAppType);
   bool IsExpectingSystemMessage();
   void OnAudioChannelProcessChanged(nsISupports* aSubject);
   void OnRemoteBrowserFrameShown(nsISupports* aSubject);
   void OnTabParentDestroyed(nsISupports* aSubject);
   void OnFrameloaderVisibleChanged(nsISupports* aSubject);
   void OnChannelConnected(nsISupports* aSubject);
   ProcessPriority CurrentPriority();
   ProcessPriority ComputePriority();
   ProcessCPUPriority ComputeCPUPriority(ProcessPriority aPriority);
   void ScheduleResetPriority(const char* aTimeoutPref);
   void ResetPriority();
   void ResetPriorityNow();
   void ResetCPUPriorityNow();
   /**
    * This overload is equivalent to SetPriorityNow(aPriority,
    * ComputeCPUPriority()).
    */
   void SetPriorityNow(ProcessPriority aPriority,
                       uint32_t aBackgroundLRU = 0);
   void SetPriorityNow(ProcessPriority aPriority,
                       ProcessCPUPriority aCPUPriority,
                       uint32_t aBackgroundLRU = 0);
   void ShutDown();
 private:
   void FireTestOnlyObserverNotification(
     const char* aTopic,
     const nsACString& aData = EmptyCString());
   void FireTestOnlyObserverNotification(
     const char* aTopic,
     const char* aData = nullptr);
   ContentParent* mContentParent;
   uint64_t mChildID;
   ProcessPriority mPriority;
   ProcessCPUPriority mCPUPriority;
   bool mHoldsCPUWakeLock;
   bool mHoldsHighPriorityWakeLock;
   /**
    * Used to implement NameWithComma().
    */
   nsAutoCString mNameWithComma;
   nsCOMPtr<nsITimer> mResetPriorityTimer;
 };
 class BackgroundProcessLRUPool MOZ_FINAL
 {
 public:
   static BackgroundProcessLRUPool* Singleton();
   /**
    * Used to remove a ContentParent from background LRU pool when
    * it is destroyed or its priority changed from BACKGROUND to others.
    */
   void RemoveFromBackgroundLRUPool(ContentParent* aContentParent);
   /**
    * Used to add a ContentParent into background LRU pool when
    * its priority changed to BACKGROUND from others.
    */
   void AddIntoBackgroundLRUPool(ContentParent* aContentParent);
 private:
   static StaticAutoPtr<BackgroundProcessLRUPool> sSingleton;
   int32_t mLRUPoolLevels;
   int32_t mLRUPoolSize;
   int32_t mLRUPoolAvailableIndex;
   nsTArray<ContentParent*> mLRUPool;
   uint32_t CalculateLRULevel(uint32_t aBackgroundLRUPoolIndex);
   nsresult UpdateAvailableIndexInLRUPool(
       ContentParent* aContentParent,
       int32_t aTargetIndex = -1);
   void ShiftLRUPool();
   void EnsureLRUPool();
   BackgroundProcessLRUPool();
   DISALLOW_EVIL_CONSTRUCTORS(BackgroundProcessLRUPool);
 };
 /* static */ bool ProcessPriorityManagerImpl::sInitialized = false;
 /* static */ bool ProcessPriorityManagerImpl::sPrefListenersRegistered = false;
 /* static */ StaticRefPtr<ProcessPriorityManagerImpl>
   ProcessPriorityManagerImpl::sSingleton;
 NS_IMPL_ISUPPORTS(ProcessPriorityManagerImpl,
                   nsIObserver);
 /* static */ void
 ProcessPriorityManagerImpl::PrefChangedCallback(const char* aPref,
                                                 void* aClosure)
 {
   StaticInit();
 }
 /* static */ bool
 ProcessPriorityManagerImpl::PrefsEnabled()
 {
   return Preferences::GetBool("dom.ipc.processPriorityManager.enabled") &&
          !Preferences::GetBool("dom.ipc.tabs.disabled");
 }
 /* static */ void
 ProcessPriorityManagerImpl::StaticInit()
 {
   if (sInitialized) {
     return;
   }
   // The process priority manager is main-process only.
   if (XRE_GetProcessType() != GeckoProcessType_Default) {
     sInitialized = true;
     return;
   }
   // If IPC tabs aren't enabled at startup, don't bother with any of this.
   if (!PrefsEnabled()) {
     LOG("InitProcessPriorityManager bailing due to prefs.");
     // Run StaticInit() again if the prefs change.  We don't expect this to
     // happen in normal operation, but it happens during testing.
     if (!sPrefListenersRegistered) {
       sPrefListenersRegistered = true;
       Preferences::RegisterCallback(PrefChangedCallback,
                                     "dom.ipc.processPriorityManager.enabled");
       Preferences::RegisterCallback(PrefChangedCallback,
                                     "dom.ipc.tabs.disabled");
     }
     return;
   }
   sInitialized = true;
   sSingleton = new ProcessPriorityManagerImpl();
   sSingleton->Init();
   ClearOnShutdown(&sSingleton);
 }
 /* static */ ProcessPriorityManagerImpl*
 ProcessPriorityManagerImpl::GetSingleton()
 {
   if (!sSingleton) {
     StaticInit();
   }
   return sSingleton;
 }
 ProcessPriorityManagerImpl::ProcessPriorityManagerImpl()
 {
   MOZ_ASSERT(XRE_GetProcessType() == GeckoProcessType_Default);
 }
 void
 ProcessPriorityManagerImpl::Init()
 {
   LOG("Starting up.  This is the master process.");
   // The master process's priority never changes; set it here and then forget
   // about it.  We'll manage only subprocesses' priorities using the process
   // priority manager.
   hal::SetProcessPriority(getpid(), PROCESS_PRIORITY_MASTER,
                           PROCESS_CPU_PRIORITY_NORMAL);
   nsCOMPtr<nsIObserverService> os = services::GetObserverService();
   if (os) {
     os->AddObserver(this, "ipc:content-created", /* ownsWeak */ false);
     os->AddObserver(this, "ipc:content-shutdown", /* ownsWeak */ false);
   }
 }
 NS_IMETHODIMP
 ProcessPriorityManagerImpl::Observe(
   nsISupports* aSubject,
   const char* aTopic,
   const char16_t* aData)
 {
   nsDependentCString topic(aTopic);
   if (topic.EqualsLiteral("ipc:content-created")) {
     ObserveContentParentCreated(aSubject);
   } else if (topic.EqualsLiteral("ipc:content-shutdown")) {
     ObserveContentParentDestroyed(aSubject);
   } else {
     MOZ_ASSERT(false);
   }
   return NS_OK;
 }
 already_AddRefed<ParticularProcessPriorityManager>
 ProcessPriorityManagerImpl::GetParticularProcessPriorityManager(
   ContentParent* aContentParent)
 {
   nsRefPtr<ParticularProcessPriorityManager> pppm;
   mParticularManagers.Get(aContentParent->ChildID(), &pppm);
   if (!pppm) {
     pppm = new ParticularProcessPriorityManager(aContentParent);
     pppm->Init();
     mParticularManagers.Put(aContentParent->ChildID(), pppm);
     FireTestOnlyObserverNotification("process-created",
       nsPrintfCString("%lld", aContentParent->ChildID()));
   }
   return pppm.forget();
 }
 void
 ProcessPriorityManagerImpl::SetProcessPriority(ContentParent* aContentParent,
                                                ProcessPriority aPriority,
                                                uint32_t aBackgroundLRU)
 {
   MOZ_ASSERT(aContentParent);
   nsRefPtr<ParticularProcessPriorityManager> pppm =
     GetParticularProcessPriorityManager(aContentParent);
   pppm->SetPriorityNow(aPriority, aBackgroundLRU);
 }
 void
 ProcessPriorityManagerImpl::ObserveContentParentCreated(
   nsISupports* aContentParent)
 {
   // Do nothing; it's sufficient to get the PPPM.  But assign to nsRefPtr so we
   // don't leak the already_AddRefed object.
   nsCOMPtr<nsIObserver> cp = do_QueryInterface(aContentParent);
   nsRefPtr<ParticularProcessPriorityManager> pppm =
     GetParticularProcessPriorityManager(static_cast<ContentParent*>(cp.get()));
 }
 static PLDHashOperator
 EnumerateParticularProcessPriorityManagers(
   const uint64_t& aKey,
   nsRefPtr<ParticularProcessPriorityManager> aValue,
   void* aUserData)
 {
   nsTArray<nsRefPtr<ParticularProcessPriorityManager> >* aArray =
     static_cast<nsTArray<nsRefPtr<ParticularProcessPriorityManager> >*>(aUserData);
   aArray->AppendElement(aValue);
   return PL_DHASH_NEXT;
 }
 void
 ProcessPriorityManagerImpl::ObserveContentParentDestroyed(nsISupports* aSubject)
 {
   nsCOMPtr<nsIPropertyBag2> props = do_QueryInterface(aSubject);
   NS_ENSURE_TRUE_VOID(props);
   uint64_t childID = CONTENT_PROCESS_ID_UNKNOWN;
   props->GetPropertyAsUint64(NS_LITERAL_STRING("childID"), &childID);
   NS_ENSURE_TRUE_VOID(childID != CONTENT_PROCESS_ID_UNKNOWN);
   nsRefPtr<ParticularProcessPriorityManager> pppm;
   mParticularManagers.Get(childID, &pppm);
   MOZ_ASSERT(pppm);
   if (pppm) {
     pppm->ShutDown();
   }
   mParticularManagers.Remove(childID);
   if (mHighPriorityChildIDs.Contains(childID)) {
     mHighPriorityChildIDs.RemoveEntry(childID);
     // We just lost a high-priority process; reset everyone's CPU priorities.
     nsTArray<nsRefPtr<ParticularProcessPriorityManager> > pppms;
     mParticularManagers.EnumerateRead(
       &EnumerateParticularProcessPriorityManagers,
       &pppms);
     for (uint32_t i = 0; i < pppms.Length(); i++) {
       pppms[i]->ResetCPUPriorityNow();
     }
   }
 }
 bool
 ProcessPriorityManagerImpl::OtherProcessHasHighPriority(
   ParticularProcessPriorityManager* aParticularManager)
 {
   if (mHighPriorityChildIDs.Contains(aParticularManager->ChildID())) {
     return mHighPriorityChildIDs.Count() > 1;
   }
   return mHighPriorityChildIDs.Count() > 0;
 }
 bool
 ProcessPriorityManagerImpl::ChildProcessHasHighPriority( void )
 {
   return mHighPriorityChildIDs.Count() > 0;
 }
 void
 ProcessPriorityManagerImpl::NotifyProcessPriorityChanged(
   ParticularProcessPriorityManager* aParticularManager,
   ProcessPriority aOldPriority)
 {
   // This priority change can only affect other processes' priorities if we're
   // changing to/from FOREGROUND_HIGH.
   if (aOldPriority < PROCESS_PRIORITY_FOREGROUND_HIGH &&
       aParticularManager->CurrentPriority() <
         PROCESS_PRIORITY_FOREGROUND_HIGH) {
     return;
   }
   if (aParticularManager->CurrentPriority() >=
       PROCESS_PRIORITY_FOREGROUND_HIGH) {
     mHighPriorityChildIDs.PutEntry(aParticularManager->ChildID());
   } else {
     mHighPriorityChildIDs.RemoveEntry(aParticularManager->ChildID());
   }
   nsTArray<nsRefPtr<ParticularProcessPriorityManager> > pppms;
   mParticularManagers.EnumerateRead(
     &EnumerateParticularProcessPriorityManagers,
     &pppms);
   for (uint32_t i = 0; i < pppms.Length(); i++) {
     if (pppms[i] != aParticularManager) {
       pppms[i]->ResetCPUPriorityNow();
     }
   }
 }
 NS_IMPL_ISUPPORTS(ParticularProcessPriorityManager,
                   nsIObserver,
                   nsITimerCallback,
                   nsISupportsWeakReference);
 ParticularProcessPriorityManager::ParticularProcessPriorityManager(
   ContentParent* aContentParent)
   : mContentParent(aContentParent)
   , mChildID(aContentParent->ChildID())
   , mPriority(PROCESS_PRIORITY_UNKNOWN)
   , mCPUPriority(PROCESS_CPU_PRIORITY_NORMAL)
   , mHoldsCPUWakeLock(false)
   , mHoldsHighPriorityWakeLock(false)
 {
   MOZ_ASSERT(XRE_GetProcessType() == GeckoProcessType_Default);
   LOGP("Creating ParticularProcessPriorityManager.");
 }
 void
 ParticularProcessPriorityManager::Init()
 {
   RegisterWakeLockObserver(this);
   nsCOMPtr<nsIObserverService> os = services::GetObserverService();
   if (os) {
     os->AddObserver(this, "audio-channel-process-changed", /* ownsWeak */ true);
     os->AddObserver(this, "remote-browser-shown", /* ownsWeak */ true);
     os->AddObserver(this, "ipc:browser-destroyed", /* ownsWeak */ true);
     os->AddObserver(this, "frameloader-visible-changed", /* ownsWeak */ true);
   }
   // This process may already hold the CPU lock; for example, our parent may
   // have acquired it on our behalf.
   WakeLockInformation info1, info2;
   GetWakeLockInfo(NS_LITERAL_STRING("cpu"), &info1);
   mHoldsCPUWakeLock = info1.lockingProcesses().Contains(ChildID());
   GetWakeLockInfo(NS_LITERAL_STRING("high-priority"), &info2);
   mHoldsHighPriorityWakeLock = info2.lockingProcesses().Contains(ChildID());
   LOGP("Done starting up.  mHoldsCPUWakeLock=%d, mHoldsHighPriorityWakeLock=%d",
        mHoldsCPUWakeLock, mHoldsHighPriorityWakeLock);
 }
 ParticularProcessPriorityManager::~ParticularProcessPriorityManager()
 {
   LOGP("Destroying ParticularProcessPriorityManager.");
   // Unregister our wake lock observer if ShutDown hasn't been called.  (The
   // wake lock observer takes raw refs, so we don't want to take chances here!)
   // We don't call UnregisterWakeLockObserver unconditionally because the code
   // will print a warning if it's called unnecessarily.
   if (mContentParent) {
     UnregisterWakeLockObserver(this);
   }
 }
 /* virtual */ void
 ParticularProcessPriorityManager::Notify(const WakeLockInformation& aInfo)
 {
   if (!mContentParent) {
     // We've been shut down.
     return;
   }
   bool* dest = nullptr;
   if (aInfo.topic().EqualsLiteral("cpu")) {
     dest = &mHoldsCPUWakeLock;
   } else if (aInfo.topic().EqualsLiteral("high-priority")) {
     dest = &mHoldsHighPriorityWakeLock;
   }
   if (dest) {
     bool thisProcessLocks = aInfo.lockingProcesses().Contains(ChildID());
     if (thisProcessLocks != *dest) {
       *dest = thisProcessLocks;
       LOGP("Got wake lock changed event. "
            "Now mHoldsCPUWakeLock=%d, mHoldsHighPriorityWakeLock=%d",
            mHoldsCPUWakeLock, mHoldsHighPriorityWakeLock);
       ResetPriority();
     }
   }
 }
 NS_IMETHODIMP
 ParticularProcessPriorityManager::Observe(nsISupports* aSubject,
                                           const char* aTopic,
                                           const char16_t* aData)
 {
   if (!mContentParent) {
     // We've been shut down.
     return NS_OK;
   }
   nsDependentCString topic(aTopic);
   if (topic.EqualsLiteral("audio-channel-process-changed")) {
     OnAudioChannelProcessChanged(aSubject);
   } else if (topic.EqualsLiteral("remote-browser-shown")) {
     OnRemoteBrowserFrameShown(aSubject);
   } else if (topic.EqualsLiteral("ipc:browser-destroyed")) {
     OnTabParentDestroyed(aSubject);
   } else if (topic.EqualsLiteral("frameloader-visible-changed")) {
     OnFrameloaderVisibleChanged(aSubject);
   } else {
     MOZ_ASSERT(false);
   }
   return NS_OK;
 }
 uint64_t
 ParticularProcessPriorityManager::ChildID() const
 {
   // We have to cache mContentParent->ChildID() instead of getting it from the
   // ContentParent each time because after ShutDown() is called, mContentParent
   // is null.  If we didn't cache ChildID(), then we wouldn't be able to run
   // LOGP() after ShutDown().
   return mChildID;
 }
 int32_t
 ParticularProcessPriorityManager::Pid() const
 {
   return mContentParent ? mContentParent->Pid() : -1;
 }
 bool
 ParticularProcessPriorityManager::IsPreallocated() const
 {
   return mContentParent ? mContentParent->IsPreallocated() : false;
 }
 const nsAutoCString&
 ParticularProcessPriorityManager::NameWithComma()
 {
   mNameWithComma.Truncate();
   if (!mContentParent) {
     return mNameWithComma; // empty string
   }
   nsAutoString name;
   mContentParent->FriendlyName(name);
   if (name.IsEmpty()) {
     return mNameWithComma; // empty string
   }
   mNameWithComma = NS_ConvertUTF16toUTF8(name);
   mNameWithComma.AppendLiteral(", ");
   return mNameWithComma;
 }
 void
 ParticularProcessPriorityManager::OnAudioChannelProcessChanged(nsISupports* aSubject)
 {
   nsCOMPtr<nsIPropertyBag2> props = do_QueryInterface(aSubject);
   NS_ENSURE_TRUE_VOID(props);
   uint64_t childID = CONTENT_PROCESS_ID_UNKNOWN;
   props->GetPropertyAsUint64(NS_LITERAL_STRING("childID"), &childID);
   if (childID == ChildID()) {
     ResetPriority();
   }
 }
 void
 ParticularProcessPriorityManager::OnRemoteBrowserFrameShown(nsISupports* aSubject)
 {
   nsCOMPtr<nsIFrameLoader> fl = do_QueryInterface(aSubject);
   NS_ENSURE_TRUE_VOID(fl);
   // Ignore notifications that aren't from a BrowserOrApp
   bool isBrowserOrApp;
   fl->GetOwnerIsBrowserOrAppFrame(&isBrowserOrApp);
   if (!isBrowserOrApp) {
     return;
   }
   nsCOMPtr<nsITabParent> tp;
   fl->GetTabParent(getter_AddRefs(tp));
   NS_ENSURE_TRUE_VOID(tp);
   if (static_cast<TabParent*>(tp.get())->Manager() != mContentParent) {
     return;
   }
   ResetPriority();
 }
 void
 ParticularProcessPriorityManager::OnTabParentDestroyed(nsISupports* aSubject)
 {
   nsCOMPtr<nsITabParent> tp = do_QueryInterface(aSubject);
   NS_ENSURE_TRUE_VOID(tp);
   if (static_cast<TabParent*>(tp.get())->Manager() != mContentParent) {
     return;
   }
   ResetPriority();
 }
 void
 ParticularProcessPriorityManager::OnFrameloaderVisibleChanged(nsISupports* aSubject)
 {
   nsCOMPtr<nsIFrameLoader> fl = do_QueryInterface(aSubject);
   NS_ENSURE_TRUE_VOID(fl);
   nsCOMPtr<nsITabParent> tp;
   fl->GetTabParent(getter_AddRefs(tp));
   if (!tp) {
     return;
   }
   if (static_cast<TabParent*>(tp.get())->Manager() != mContentParent) {
     return;
   }
   // Most of the time when something changes in a process we call
   // ResetPriority(), giving a grace period before downgrading its priority.
   // But notice that here don't give a grace period: We call ResetPriorityNow()
   // instead.
   //
   // We do this because we're reacting here to a setVisibility() call, which is
   // an explicit signal from the process embedder that we should re-prioritize
   // a process.  If we gave a grace period in response to setVisibility()
   // calls, it would be impossible for the embedder to explicitly prioritize
   // processes and prevent e.g. the case where we switch which process is in
   // the foreground and, during the old fg processs's grace period, it OOMs the
   // new fg process.
   ResetPriorityNow();
 }
 void
 ParticularProcessPriorityManager::ResetPriority()
 {
   ProcessPriority processPriority = ComputePriority();
   if (mPriority == PROCESS_PRIORITY_UNKNOWN ||
       mPriority > processPriority) {
     // Apps set at a perceivable background priority are often playing media.
     // Most media will have short gaps while changing tracks between songs,
     // switching videos, etc.  Give these apps a longer grace period so they
     // can get their next track started, if there is one, before getting
     // downgraded.
     if (mPriority == PROCESS_PRIORITY_BACKGROUND_PERCEIVABLE) {
       ScheduleResetPriority("backgroundPerceivableGracePeriodMS");
     } else {
       ScheduleResetPriority("backgroundGracePeriodMS");
     }
     return;
   }
   SetPriorityNow(processPriority);
 }
 void
 ParticularProcessPriorityManager::ResetPriorityNow()
 {
   SetPriorityNow(ComputePriority());
 }
 void
 ParticularProcessPriorityManager::ScheduleResetPriority(const char* aTimeoutPref)
 {
   if (mResetPriorityTimer) {
     LOGP("ScheduleResetPriority bailing; the timer is already running.");
     return;
   }
   uint32_t timeout = Preferences::GetUint(
     nsPrintfCString("dom.ipc.processPriorityManager.%s", aTimeoutPref).get());
   LOGP("Scheduling reset timer to fire in %dms.", timeout);
   mResetPriorityTimer = do_CreateInstance("@mozilla.org/timer;1");
   mResetPriorityTimer->InitWithCallback(this, timeout, nsITimer::TYPE_ONE_SHOT);
 }
 NS_IMETHODIMP
 ParticularProcessPriorityManager::Notify(nsITimer* aTimer)
 {
   LOGP("Reset priority timer callback; about to ResetPriorityNow.");
   ResetPriorityNow();
   mResetPriorityTimer = nullptr;
   return NS_OK;
 }
 bool
 ParticularProcessPriorityManager::HasAppType(const char* aAppType)
 {
   const InfallibleTArray<PBrowserParent*>& browsers =
     mContentParent->ManagedPBrowserParent();
   for (uint32_t i = 0; i < browsers.Length(); i++) {
     nsAutoString appType;
     static_cast<TabParent*>(browsers[i])->GetAppType(appType);
     if (appType.EqualsASCII(aAppType)) {
       return true;
     }
   }
   return false;
 }
 bool
 ParticularProcessPriorityManager::IsExpectingSystemMessage()
 {
   const InfallibleTArray<PBrowserParent*>& browsers =
     mContentParent->ManagedPBrowserParent();
   for (uint32_t i = 0; i < browsers.Length(); i++) {
     TabParent* tp = static_cast<TabParent*>(browsers[i]);
     nsCOMPtr<nsIMozBrowserFrame> bf = do_QueryInterface(tp->GetOwnerElement());
     if (!bf) {
       continue;
     }
     if (bf->GetIsExpectingSystemMessage()) {
       return true;
     }
   }
   return false;
 }
 ProcessPriority
 ParticularProcessPriorityManager::CurrentPriority()
 {
   return mPriority;
 }
 ProcessPriority
 ParticularProcessPriorityManager::ComputePriority()
 {
   if ((mHoldsCPUWakeLock || mHoldsHighPriorityWakeLock) &&
       HasAppType("critical")) {
     return PROCESS_PRIORITY_FOREGROUND_HIGH;
   }
   bool isVisible = false;
   const InfallibleTArray<PBrowserParent*>& browsers =
     mContentParent->ManagedPBrowserParent();
   for (uint32_t i = 0; i < browsers.Length(); i++) {
     if (static_cast<TabParent*>(browsers[i])->IsVisible()) {
       isVisible = true;
       break;
     }
   }
   if (isVisible) {
     return HasAppType("keyboard") ?
       PROCESS_PRIORITY_FOREGROUND_KEYBOARD :
       PROCESS_PRIORITY_FOREGROUND;
   }
   if ((mHoldsCPUWakeLock || mHoldsHighPriorityWakeLock) &&
       IsExpectingSystemMessage()) {
     return PROCESS_PRIORITY_BACKGROUND_PERCEIVABLE;
   }
   AudioChannelService* service = AudioChannelService::GetAudioChannelService();
   if (service->ProcessContentOrNormalChannelIsActive(ChildID())) {
     return PROCESS_PRIORITY_BACKGROUND_PERCEIVABLE;
   }
   return HasAppType("homescreen") ?
          PROCESS_PRIORITY_BACKGROUND_HOMESCREEN :
          PROCESS_PRIORITY_BACKGROUND;
 }
 ProcessCPUPriority
 ParticularProcessPriorityManager::ComputeCPUPriority(ProcessPriority aPriority)
 {
   if (aPriority == PROCESS_PRIORITY_PREALLOC) {
     return PROCESS_CPU_PRIORITY_LOW;
   }
   if (aPriority >= PROCESS_PRIORITY_FOREGROUND_HIGH) {
     return PROCESS_CPU_PRIORITY_NORMAL;
   }
   return ProcessPriorityManagerImpl::GetSingleton()->
     OtherProcessHasHighPriority(this) ?
     PROCESS_CPU_PRIORITY_LOW :
     PROCESS_CPU_PRIORITY_NORMAL;
 }
 void
 ParticularProcessPriorityManager::ResetCPUPriorityNow()
 {
   SetPriorityNow(mPriority);
 }
 void
 ParticularProcessPriorityManager::SetPriorityNow(ProcessPriority aPriority,
                                                  uint32_t aBackgroundLRU)
 {
   SetPriorityNow(aPriority, ComputeCPUPriority(aPriority), aBackgroundLRU);
 }
 void
 ParticularProcessPriorityManager::SetPriorityNow(ProcessPriority aPriority,
                                                  ProcessCPUPriority aCPUPriority,
                                                  uint32_t aBackgroundLRU)
 {
   if (aPriority == PROCESS_PRIORITY_UNKNOWN) {
     MOZ_ASSERT(false);
     return;
   }
 #ifdef MOZ_NUWA_PROCESS
   // Do not attempt to change the priority of the Nuwa process
   if (mContentParent->IsNuwaProcess()) {
     return;
   }
 #endif
   if (aBackgroundLRU > 0 &&
       aPriority == PROCESS_PRIORITY_BACKGROUND &&
       mPriority == PROCESS_PRIORITY_BACKGROUND) {
     hal::SetProcessPriority(Pid(), mPriority, mCPUPriority, aBackgroundLRU);
     nsPrintfCString ProcessPriorityWithBackgroundLRU("%s:%d",
       ProcessPriorityToString(mPriority, mCPUPriority),
       aBackgroundLRU);
     FireTestOnlyObserverNotification("process-priority-with-background-LRU-set",
       ProcessPriorityWithBackgroundLRU.get());
   }
   if (!mContentParent ||
       !ProcessPriorityManagerImpl::PrefsEnabled() ||
       (mPriority == aPriority && mCPUPriority == aCPUPriority)) {
     return;
   }
   // If the prefs were disabled after this ParticularProcessPriorityManager was
   // created, we can at least avoid any further calls to
   // hal::SetProcessPriority.  Supporting dynamic enabling/disabling of the
   // ProcessPriorityManager is mostly for testing.
   if (!ProcessPriorityManagerImpl::PrefsEnabled()) {
     return;
   }
   if (aPriority == PROCESS_PRIORITY_BACKGROUND &&
       mPriority != PROCESS_PRIORITY_BACKGROUND &&
       !IsPreallocated()) {
     ProcessPriorityManager::AddIntoBackgroundLRUPool(mContentParent);
   }
   if (aPriority != PROCESS_PRIORITY_BACKGROUND &&
       mPriority == PROCESS_PRIORITY_BACKGROUND &&
       !IsPreallocated()) {
     ProcessPriorityManager::RemoveFromBackgroundLRUPool(mContentParent);
   }
   LOGP("Changing priority from %s to %s.",
        ProcessPriorityToString(mPriority, mCPUPriority),
        ProcessPriorityToString(aPriority, aCPUPriority));
   ProcessPriority oldPriority = mPriority;
   mPriority = aPriority;
   mCPUPriority = aCPUPriority;
   hal::SetProcessPriority(Pid(), mPriority, mCPUPriority);
   if (oldPriority != mPriority) {
     unused << mContentParent->SendNotifyProcessPriorityChanged(mPriority);
   }
   if (aPriority < PROCESS_PRIORITY_FOREGROUND) {
     unused << mContentParent->SendFlushMemory(NS_LITERAL_STRING("low-memory"));
   }
   FireTestOnlyObserverNotification("process-priority-set",
     ProcessPriorityToString(mPriority, mCPUPriority));
   if (oldPriority != mPriority) {
     ProcessPriorityManagerImpl::GetSingleton()->
       NotifyProcessPriorityChanged(this, oldPriority);
   }
 }
 void
 ParticularProcessPriorityManager::ShutDown()
 {
   MOZ_ASSERT(mContentParent);
   UnregisterWakeLockObserver(this);
   if (mResetPriorityTimer) {
     mResetPriorityTimer->Cancel();
     mResetPriorityTimer = nullptr;
   }
   if (mPriority == PROCESS_PRIORITY_BACKGROUND && !IsPreallocated()) {
     ProcessPriorityManager::RemoveFromBackgroundLRUPool(mContentParent);
   }
   mContentParent = nullptr;
 }
 void
 ProcessPriorityManagerImpl::FireTestOnlyObserverNotification(
   const char* aTopic,
   const nsACString& aData /* = EmptyCString() */)
 {
   if (!Preferences::GetBool("dom.ipc.processPriorityManager.testMode")) {
     return;
   }
   nsCOMPtr<nsIObserverService> os = services::GetObserverService();
   NS_ENSURE_TRUE_VOID(os);
   nsPrintfCString topic("process-priority-manager:TEST-ONLY:%s", aTopic);
   LOG("Notifying observer %s, data %s",
       topic.get(), PromiseFlatCString(aData).get());
   os->NotifyObservers(nullptr, topic.get(), NS_ConvertUTF8toUTF16(aData).get());
 }
 void
 ParticularProcessPriorityManager::FireTestOnlyObserverNotification(
   const char* aTopic,
   const char* aData /* = nullptr */ )
 {
   if (!Preferences::GetBool("dom.ipc.processPriorityManager.testMode")) {
     return;
   }
   nsAutoCString data;
   if (aData) {
     data.AppendASCII(aData);
   }
   FireTestOnlyObserverNotification(aTopic, data);
 }
 void
 ParticularProcessPriorityManager::FireTestOnlyObserverNotification(
   const char* aTopic,
   const nsACString& aData /* = EmptyCString() */)
 {
   if (!Preferences::GetBool("dom.ipc.processPriorityManager.testMode")) {
     return;
   }
   nsAutoCString data(nsPrintfCString("%lld", ChildID()));
   if (!aData.IsEmpty()) {
     data.AppendLiteral(":");
     data.Append(aData);
   }
   // ProcessPriorityManagerImpl::GetSingleton() is guaranteed not to return
   // null, since ProcessPriorityManagerImpl is the only class which creates
   // ParticularProcessPriorityManagers.
   ProcessPriorityManagerImpl::GetSingleton()->
     FireTestOnlyObserverNotification(aTopic, data);
 }
 StaticRefPtr<ProcessPriorityManagerChild>
 ProcessPriorityManagerChild::sSingleton;
 /* static */ void
 ProcessPriorityManagerChild::StaticInit()
 {
   if (!sSingleton) {
     sSingleton = new ProcessPriorityManagerChild();
     sSingleton->Init();
     ClearOnShutdown(&sSingleton);
   }
 }
 /* static */ ProcessPriorityManagerChild*
 ProcessPriorityManagerChild::Singleton()
 {
   StaticInit();
   return sSingleton;
 }
 NS_IMPL_ISUPPORTS(ProcessPriorityManagerChild,
                   nsIObserver)
 ProcessPriorityManagerChild::ProcessPriorityManagerChild()
 {
   if (XRE_GetProcessType() == GeckoProcessType_Default) {
     mCachedPriority = PROCESS_PRIORITY_MASTER;
   } else {
     mCachedPriority = PROCESS_PRIORITY_UNKNOWN;
   }
 }
 void
 ProcessPriorityManagerChild::Init()
 {
   // The process priority should only be changed in child processes; don't even
   // bother listening for changes if we're in the main process.
   if (XRE_GetProcessType() != GeckoProcessType_Default) {
     nsCOMPtr<nsIObserverService> os = services::GetObserverService();
     NS_ENSURE_TRUE_VOID(os);
     os->AddObserver(this, "ipc:process-priority-changed", /* weak = */ false);
   }
 }
 NS_IMETHODIMP
 ProcessPriorityManagerChild::Observe(
   nsISupports* aSubject,
   const char* aTopic,
   const char16_t* aData)
 {
   MOZ_ASSERT(!strcmp(aTopic, "ipc:process-priority-changed"));
   nsCOMPtr<nsIPropertyBag2> props = do_QueryInterface(aSubject);
   NS_ENSURE_TRUE(props, NS_OK);
   int32_t priority = static_cast<int32_t>(PROCESS_PRIORITY_UNKNOWN);
   props->GetPropertyAsInt32(NS_LITERAL_STRING("priority"), &priority);
   NS_ENSURE_TRUE(ProcessPriority(priority) != PROCESS_PRIORITY_UNKNOWN, NS_OK);
   mCachedPriority = static_cast<ProcessPriority>(priority);
   return NS_OK;
 }
 bool
 ProcessPriorityManagerChild::CurrentProcessIsForeground()
 {
   return mCachedPriority == PROCESS_PRIORITY_UNKNOWN ||
          mCachedPriority >= PROCESS_PRIORITY_FOREGROUND;
 }
 bool
 ProcessPriorityManagerChild::CurrentProcessIsHighPriority()
 {
   return mCachedPriority == PROCESS_PRIORITY_UNKNOWN ||
          mCachedPriority >= PROCESS_PRIORITY_FOREGROUND_HIGH;
 }
 /* static */ StaticAutoPtr<BackgroundProcessLRUPool>
 BackgroundProcessLRUPool::sSingleton;
 /* static */ BackgroundProcessLRUPool*
 BackgroundProcessLRUPool::Singleton()
 {
   if (!sSingleton) {
     sSingleton = new BackgroundProcessLRUPool();
     ClearOnShutdown(&sSingleton);
   }
   return sSingleton;
 }
 BackgroundProcessLRUPool::BackgroundProcessLRUPool()
 {
   EnsureLRUPool();
 }
 uint32_t
 BackgroundProcessLRUPool::CalculateLRULevel(uint32_t aBackgroundLRUPoolIndex)
 {
   // Set LRU level of each background process and maintain LRU buffer as below:
   // Priority background  : LRU0
   // Priority background+1: LRU1, LRU2
   // Priority background+2: LRU3, LRU4, LRU5, LRU6
   // Priority background+3: LRU7, LRU8, LRU9, LRU10, LRU11, LRU12, LRU13, LRU14
   // ...
   // Priority background+L-1: 2^(number of background LRU pool levels - 1)
   // (End of buffer)
   return (uint32_t)(log((float)aBackgroundLRUPoolIndex) / log(2.0));
 }
 void
 BackgroundProcessLRUPool::EnsureLRUPool()
 {
   // We set mBackgroundLRUPoolLevels according to our pref.
   // This value is used to set background process LRU pool
   if (!NS_SUCCEEDED(Preferences::GetInt(
         "dom.ipc.processPriorityManager.backgroundLRUPoolLevels",
         &mLRUPoolLevels))) {
     mLRUPoolLevels = 1;
   }
   if (mLRUPoolLevels <= 0) {
     MOZ_CRASH();
   }
   // GonkHal defines OOM_ADJUST_MAX is 15 and b2g.js defines
   // PROCESS_PRIORITY_BACKGROUND's oom_score_adj is 667 and oom_adj is 10.
   // This means we can only have at most (15 -10 + 1) = 6 background LRU levels.
   // See bug 822325 comment 49
   MOZ_ASSERT(mLRUPoolLevels <= 6);
   // LRU pool size = 2 ^ (number of background LRU pool levels) - 1
   mLRUPoolSize = (1 << mLRUPoolLevels) - 1;
   mLRUPoolAvailableIndex = 0;
   LOG("Making background LRU pool with size(%d)", mLRUPoolSize);
   mLRUPool.InsertElementsAt(0, mLRUPoolSize, (ContentParent*)nullptr);
 }
 void
 BackgroundProcessLRUPool::RemoveFromBackgroundLRUPool(
     ContentParent* aContentParent)
 {
   for (int32_t i = 0; i < mLRUPoolSize; i++) {
     if (mLRUPool[i]) {
       if (mLRUPool[i]->ChildID() == aContentParent->ChildID()) {
         mLRUPool[i] = nullptr;
         LOG("Remove ChildID(%llu) from LRU pool", aContentParent->ChildID());
         // After we remove this ContentParent from LRU pool, we still need to
         // update the available index if the index of removed one is less than
         // the available index we already have.
         UpdateAvailableIndexInLRUPool(aContentParent, i);
         break;
       }
     }
   }
 }
 nsresult
 BackgroundProcessLRUPool::UpdateAvailableIndexInLRUPool(
     ContentParent* aContentParent,
     int32_t aTargetIndex)
 {
   // If we specify which index we want to assign to mLRUPoolAvailableIndex,
   // We have to make sure the index in LRUPool doesn't point to any
   // ContentParent.
   if (aTargetIndex >= 0 && aTargetIndex < mLRUPoolSize &&
       aTargetIndex < mLRUPoolAvailableIndex &&
       !mLRUPool[aTargetIndex]) {
     mLRUPoolAvailableIndex = aTargetIndex;
     return NS_OK;
   }
   // When we didn't specify any legal aTargetIndex, then we just check
   // whether current mLRUPoolAvailableIndex points to any ContentParent or not.
   if (mLRUPoolAvailableIndex >= 0 && mLRUPoolAvailableIndex < mLRUPoolSize &&
       !(mLRUPool[mLRUPoolAvailableIndex])) {
     return NS_OK;
   }
   // Both above way failed. So now we have to find proper value
   // for mLRUPoolAvailableIndex.
   // We are looking for an available index. We only shift process with
   // LRU less than the available index should have, so we stop update
   // mLRUPoolAvailableIndex from the for loop once we got a candidate.
   mLRUPoolAvailableIndex = -1;
   for (int32_t i = 0; i < mLRUPoolSize; i++) {
     if (mLRUPool[i]) {
       if (mLRUPool[i]->ChildID() == aContentParent->ChildID()) {
         LOG("ChildID(%llu) already in LRU pool", aContentParent->ChildID());
         MOZ_ASSERT(false);
         return NS_ERROR_UNEXPECTED;
       }
       continue;
     } else {
       if (mLRUPoolAvailableIndex == -1) {
         mLRUPoolAvailableIndex = i;
       }
     }
   }
   // If the LRUPool is already full, mLRUPoolAvailableIndex is still -1 after
   // above loop finished. We should set mLRUPoolAvailableIndex
   // to mLRUPoolSize - 1 in this case. Here uses the mod operator to do it:
   // New mLRUPoolAvailableIndex either equals old mLRUPoolAvailableIndex, or
   // mLRUPoolSize - 1 if old mLRUPoolAvailableIndex is -1.
   mLRUPoolAvailableIndex =
     (mLRUPoolAvailableIndex + mLRUPoolSize) % mLRUPoolSize;
   return NS_OK;
 }
 void
 BackgroundProcessLRUPool::ShiftLRUPool()
 {
   for (int32_t i = mLRUPoolAvailableIndex; i > 0; i--) {
     mLRUPool[i] = mLRUPool[i - 1];
     // Check whether i+1 is power of Two.
     // If so, then it crossed a LRU group boundary and
     // we need to assign its new process priority LRU.
     if (!((i + 1) & i)) {
       ProcessPriorityManagerImpl::GetSingleton()->SetProcessPriority(
         mLRUPool[i], PROCESS_PRIORITY_BACKGROUND, CalculateLRULevel(i + 1));
     }
   }
 }
 void
 BackgroundProcessLRUPool::AddIntoBackgroundLRUPool(
     ContentParent* aContentParent)
 {
   // We have to make sure that we have correct available index in LRU pool
   if (!NS_SUCCEEDED(
       UpdateAvailableIndexInLRUPool(aContentParent))) {
     return;
   }
   // Shift the list in the pool, so we have room at index 0 for the newly added
   // ContentParent
   ShiftLRUPool();
   mLRUPool[0] = aContentParent;
   LOG("Add ChildID(%llu) into LRU pool", aContentParent->ChildID());
 }
 } // anonymous namespace
 namespace mozilla {
 /* static */ void
 ProcessPriorityManager::Init()
 {
   ProcessPriorityManagerImpl::StaticInit();
   ProcessPriorityManagerChild::StaticInit();
 }
 /* static */ void
 ProcessPriorityManager::SetProcessPriority(ContentParent* aContentParent,
                                            ProcessPriority aPriority)
 {
   MOZ_ASSERT(aContentParent);
   ProcessPriorityManagerImpl* singleton =
     ProcessPriorityManagerImpl::GetSingleton();
   if (singleton) {
     singleton->SetProcessPriority(aContentParent, aPriority);
   }
 }
 /* static */ void
 ProcessPriorityManager::RemoveFromBackgroundLRUPool(
     ContentParent* aContentParent)
 {
   MOZ_ASSERT(aContentParent);
   BackgroundProcessLRUPool* singleton =
     BackgroundProcessLRUPool::Singleton();
   if (singleton) {
     singleton->RemoveFromBackgroundLRUPool(aContentParent);
   }
 }
 /* static */ void
 ProcessPriorityManager::AddIntoBackgroundLRUPool(ContentParent* aContentParent)
 {
   MOZ_ASSERT(aContentParent);
   BackgroundProcessLRUPool* singleton =
     BackgroundProcessLRUPool::Singleton();
   if (singleton) {
     singleton->AddIntoBackgroundLRUPool(aContentParent);
   }
 }
 /* static */ bool
 ProcessPriorityManager::CurrentProcessIsForeground()
 {
   return ProcessPriorityManagerChild::Singleton()->
     CurrentProcessIsForeground();
 }
 /* static */ bool
 ProcessPriorityManager::AnyProcessHasHighPriority()
 {
   ProcessPriorityManagerImpl* singleton =
     ProcessPriorityManagerImpl::GetSingleton();
   if (singleton) {
     return singleton->ChildProcessHasHighPriority();
   } else {
     return ProcessPriorityManagerChild::Singleton()->
       CurrentProcessIsHighPriority();
   }
 }
 } // namespace mozilla

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dom/ipc/ProcessPriorityManager.cpp@7e26c7da4463 (annotated)

dom/ipc/ProcessPriorityManager.cpp