Changeset 244091 in webkit


Ignore:
Timestamp:
Apr 9, 2019 12:37:28 PM (5 years ago)
Author:
jer.noble@apple.com
Message:

[Cocoa] Awaken UIProcess if WebContent process is awakened from suspensions unexpectedly.
​https://bugs.webkit.org/show_bug.cgi?id=196659

Reviewed by Chris Dumez.

  • Platform/IPC/Connection.h:

(IPC::Connection::sendWithAsyncReply):

  • Platform/spi/ios/AssertionServicesSPI.h:
  • Shared/Cocoa/ProcessTaskStateObserver.h: Added.

(WebKit::ProcessTaskStateObserver::setClient):
(WebKit::ProcessTaskStateObserver::client):
(WebKit::ProcessTaskStateObserver::taskState const):

  • Shared/Cocoa/ProcessTaskStateObserver.mm: Added.

(-[WKProcessTaskStateObserverDelegate process:taskStateDidChange:]):
(WebKit::toProcessTaskStateObserverTaskState):
(WebKit::ProcessTaskStateObserver::ProcessTaskStateObserver):
(WebKit::ProcessTaskStateObserver::~ProcessTaskStateObserver):
(WebKit::ProcessTaskStateObserver::setTaskState):

  • UIProcess/Cocoa/WebProcessProxyCocoa.mm:

(WebKit::WebProcessProxy::processWasUnexpectedlyUnsuspended):

  • UIProcess/ProcessAssertion.h:
  • UIProcess/ProcessThrottler.cpp:

(WebKit::ProcessThrottler::updateAssertion):

  • UIProcess/ProcessThrottler.h:

(WebKit::ProcessThrottler::shouldBeRunnable const):

  • UIProcess/WebProcessProxy.h:
  • UIProcess/WebProcessProxy.messages.in:
  • UIProcess/ios/ProcessAssertionIOS.mm:

(WebKit::reasonForState):
(WebKit::toBKSProcessAssertionReason):
(WebKit::ProcessAssertion::ProcessAssertion):

  • WebKit.xcodeproj/project.pbxproj:
  • WebProcess/WebProcess.cpp:

(WebKit::WebProcess::actualPrepareToSuspend):
(WebKit::WebProcess::cancelPrepareToSuspend):
(WebKit::WebProcess::processDidResume):

  • WebProcess/WebProcess.h:
  • WebProcess/cocoa/WebProcessCocoa.mm:

(WebKit::WebProcess::processTaskStateDidChange):

Location:
trunk/Source/WebKit
Files:
1 added
15 edited
1 copied

Legend:

Unmodified
Added
Removed

  • trunk/Source/WebKit/ChangeLog

    r244089 r244091  
     12019-04-09  Jer Noble  <jer.noble@apple.com>
     2
     3        [Cocoa] Awaken UIProcess if WebContent process is awakened from suspensions unexpectedly.
     4        https://bugs.webkit.org/show_bug.cgi?id=196659
     5
     6        Reviewed by Chris Dumez.
     7
     8        * Platform/IPC/Connection.h:
     9        (IPC::Connection::sendWithAsyncReply):
     10        * Platform/spi/ios/AssertionServicesSPI.h:
     11        * Shared/Cocoa/ProcessTaskStateObserver.h: Added.
     12        (WebKit::ProcessTaskStateObserver::setClient):
     13        (WebKit::ProcessTaskStateObserver::client):
     14        (WebKit::ProcessTaskStateObserver::taskState const):
     15        * Shared/Cocoa/ProcessTaskStateObserver.mm: Added.
     16        (-[WKProcessTaskStateObserverDelegate process:taskStateDidChange:]):
     17        (WebKit::toProcessTaskStateObserverTaskState):
     18        (WebKit::ProcessTaskStateObserver::ProcessTaskStateObserver):
     19        (WebKit::ProcessTaskStateObserver::~ProcessTaskStateObserver):
     20        (WebKit::ProcessTaskStateObserver::setTaskState):
     21        * UIProcess/Cocoa/WebProcessProxyCocoa.mm:
     22        (WebKit::WebProcessProxy::processWasUnexpectedlyUnsuspended):
     23        * UIProcess/ProcessAssertion.h:
     24        * UIProcess/ProcessThrottler.cpp:
     25        (WebKit::ProcessThrottler::updateAssertion):
     26        * UIProcess/ProcessThrottler.h:
     27        (WebKit::ProcessThrottler::shouldBeRunnable const):
     28        * UIProcess/WebProcessProxy.h:
     29        * UIProcess/WebProcessProxy.messages.in:
     30        * UIProcess/ios/ProcessAssertionIOS.mm:
     31        (WebKit::reasonForState):
     32        (WebKit::toBKSProcessAssertionReason):
     33        (WebKit::ProcessAssertion::ProcessAssertion):
     34        * WebKit.xcodeproj/project.pbxproj:
     35        * WebProcess/WebProcess.cpp:
     36        (WebKit::WebProcess::actualPrepareToSuspend):
     37        (WebKit::WebProcess::cancelPrepareToSuspend):
     38        (WebKit::WebProcess::processDidResume):
     39        * WebProcess/WebProcess.h:
     40        * WebProcess/cocoa/WebProcessCocoa.mm:
     41        (WebKit::WebProcess::processTaskStateDidChange):
     42
    1432019-04-09  Alex Christensen  <achristensen@webkit.org>
    244

  • trunk/Source/WebKit/Platform/IPC/Connection.h

    r243460 r244091  
    178178    void postConnectionDidCloseOnConnectionWorkQueue();
    179179
    180     template<typename T, typename... Args> void sendWithAsyncReply(T&& message, CompletionHandler<void(Args...)>&& args, uint64_t destinationID = 0);
     180    template<typename T, typename C> void sendWithAsyncReply(T&& message, C&& completionHandler, uint64_t destinationID = 0);
    181181    template<typename T> bool send(T&& message, uint64_t destinationID, OptionSet<SendOption> sendOptions = { });
    182182    template<typename T> void sendWithReply(T&& message, uint64_t destinationID, FunctionDispatcher& replyDispatcher, Function<void(Optional<typename CodingType<typename T::Reply>::Type>)>&& replyHandler);
    … …  
    417417CompletionHandler<void(Decoder*)> takeAsyncReplyHandler(Connection&, uint64_t);
    418418
    419 template<typename T, typename... Args>
    420 void Connection::sendWithAsyncReply(T&& message, CompletionHandler<void(Args...)>&& completionHandler, uint64_t destinationID)
     419template<typename T, typename C>
     420void Connection::sendWithAsyncReply(T&& message, C&& completionHandler, uint64_t destinationID)
    421421{
    422422    COMPILE_ASSERT(!T::isSync, AsyncMessageExpected);

  • trunk/Source/WebKit/Platform/spi/ios/AssertionServicesSPI.h

    r240954 r244091  
    2929
    3030#import <AssertionServices/BKSApplicationStateMonitor.h>
     31#import <AssertionServices/BKSProcess.h>
    3132#import <AssertionServices/BKSProcessAssertion.h>
    3233
    … …  
    6970
    7071enum {
     72    BKSProcessAssertionReasonFinishTask = 4,
    7173    BKSProcessAssertionReasonExtension = 13,
    7274    BKSProcessAssertionReasonFinishTaskUnbounded = 10004,
    … …  
    8890@end
    8991
     92enum {
     93    BKSProcessTaskStateNone,
     94    BKSProcessTaskStateRunning,
     95    BKSProcessTaskStateSuspended,
     96};
     97typedef uint32_t BKSProcessTaskState;
     98
     99@class BKSProcess;
     100
     101@protocol BKSProcessDelegate <NSObject>
     102@optional
     103- (void)process:(BKSProcess *)process taskStateDidChange:(BKSProcessTaskState)newState;
     104@end
     105
     106@interface BKSProcess : NSObject
     107@end
     108
     109@interface BKSProcess ()
     110+ (BKSProcess *)currentProcess;
     111@property (nonatomic, readwrite, weak) id <BKSProcessDelegate> delegate;
     112@property (nonatomic, readonly, assign) BKSProcessTaskState taskState;
     113@end
     114
    90115#endif

  • trunk/Source/WebKit/Shared/Cocoa/ProcessTaskStateObserver.h

    r244090 r244091  
    11/*
    2  * Copyright (C) 2014-2019 Apple Inc. All rights reserved.
     2 * Copyright (C) 2019 Apple Inc. All rights reserved.
    33 *
    44 * Redistribution and use in source and binary forms, with or without
    … …  
    2424 */
    2525
    26 #include "config.h"
    27 #include "ProcessAssertion.h"
     26#pragma once
    2827
    29 #if !PLATFORM(IOS_FAMILY)
     28#if PLATFORM(IOS_FAMILY)
     29
     30#include <wtf/RetainPtr.h>
     31
     32OBJC_CLASS WKProcessTaskStateObserverDelegate;
     33OBJC_CLASS BKSProcess;
    3034
    3135namespace WebKit {
    3236
    33 ProcessAssertion::ProcessAssertion(ProcessID, const String&, AssertionState assertionState)
    34     : m_assertionState(assertionState)
    35 {
     37class ProcessTaskStateObserver {
     38public:
     39    class Client;
     40
     41    ProcessTaskStateObserver();
     42    explicit ProcessTaskStateObserver(Client&);
     43    ~ProcessTaskStateObserver();
     44   
     45    enum TaskState {
     46        None,
     47        Running,
     48        Suspended,
     49    };
     50
     51    class Client {
     52    public:
     53        virtual ~Client() = default;
     54        virtual void processTaskStateDidChange(TaskState) = 0;
     55    };
     56
     57    void setClient(Client& client) { m_client = &client; }
     58    Client* client() { return m_client; }
     59
     60    TaskState taskState() const { return m_taskState; }
     61
     62private:
     63    void setTaskState(TaskState);
     64
     65    Client* m_client { nullptr };
     66    TaskState m_taskState { None };
     67    RetainPtr<BKSProcess> m_process;
     68    RetainPtr<WKProcessTaskStateObserverDelegate> m_delegate;
     69};
     70
    3671}
    3772
    38 ProcessAssertion::~ProcessAssertion() = default;
    39 
    40 void ProcessAssertion::setState(AssertionState assertionState)
    41 {
    42     m_assertionState = assertionState;
    43 }
    44 
    45 } // namespace WebKit
    46 
    47 #endif // !PLATFORM(IOS_FAMILY)
     73#endif // PLATFORM(IOS_FAMILY)

  • trunk/Source/WebKit/UIProcess/Cocoa/WebProcessProxyCocoa.mm

    r242339 r244091  
    4242namespace WebKit {
    4343
     44static const Seconds unexpectedActivityDuration = 10_s;
     45
    4446const HashSet<String>& WebProcessProxy::platformPathsWithAssumedReadAccess()
    4547{
    … …  
    188190#endif
    189191
    190 }
     192#if PLATFORM(IOS_FAMILY)
     193void WebProcessProxy::processWasUnexpectedlyUnsuspended(CompletionHandler<void()>&& completion)
     194{
     195    if (m_throttler.shouldBeRunnable()) {
     196        // The process becoming unsuspended was not unexpected; it likely was notified of its running state
     197        // before receiving a procsessDidResume() message from the UIProcess.
     198        completion();
     199        return;
     200    }
     201
     202    // The WebProcess was awakened by something other than the UIProcess. Take out an assertion for a
     203    // limited duration to allow whatever task needs to be accomplished time to complete.
     204    RELEASE_LOG(ProcessSuspension, "%p - WebProcessProxy::processWasUnexpectedlyUnsuspended()", this);
     205    auto backgroundActivityTimeoutHandler = [activityToken = m_throttler.backgroundActivityToken(), weakThis = makeWeakPtr(this)] {
     206        RELEASE_LOG(ProcessSuspension, "%p - WebProcessProxy::processWasUnexpectedlyUnsuspended() - lambda, background activity timed out", weakThis.get());
     207    };
     208    m_unexpectedActivityTimer = std::make_unique<WebCore::DeferrableOneShotTimer>(WTFMove(backgroundActivityTimeoutHandler), unexpectedActivityDuration);
     209    completion();
     210}
     211#endif
     212
     213}

  • trunk/Source/WebKit/UIProcess/ProcessAssertion.cpp

    r242666 r244091  
    3636}
    3737
     38ProcessAssertion::ProcessAssertion(pid_t pid, const String& name, AssertionState assertionState, AssertionReason)
     39    : m_assertionState(assertionState)
     40{
     41}
     42
    3843ProcessAssertion::~ProcessAssertion() = default;
    3944

  • trunk/Source/WebKit/UIProcess/ProcessAssertion.h

    r242666 r244091  
    4646    Background,
    4747    UnboundedNetworking,
    48     Foreground
     48    Foreground,
     49};
     50
     51enum class AssertionReason {
     52    Extension,
     53    FinishTask,
     54    FinishTaskUnbounded,
    4955};
    5056
    … …  
    5965
    6066    ProcessAssertion(ProcessID, const String& reason, AssertionState);
     67    ProcessAssertion(ProcessID, const String& reason, AssertionState, AssertionReason);
    6168    virtual ~ProcessAssertion();
    6269

  • trunk/Source/WebKit/UIProcess/ProcessThrottler.cpp

    r242610 r244091  
    6969void ProcessThrottler::updateAssertion()
    7070{
    71     bool shouldBeRunnable = m_foregroundCounter.value() || m_backgroundCounter.value();
     71    bool shouldBeRunnable = this->shouldBeRunnable();
    7272
    7373    // If the process is currently runnable but will be suspended then first give it a chance to complete what it was doing

  • trunk/Source/WebKit/UIProcess/ProcessThrottler.h

    r242610 r244091  
    6161    void processReadyToSuspend();
    6262    void didCancelProcessSuspension();
     63    bool shouldBeRunnable() const { return m_foregroundCounter.value() || m_backgroundCounter.value(); }
    6364
    6465private:

  • trunk/Source/WebKit/UIProcess/WebProcessProxy.h

    r244085 r244091  
    5858
    5959namespace WebCore {
     60class DeferrableOneShotTimer;
    6061class ResourceRequest;
    6162struct PluginInfo;
    … …  
    302303#endif
    303304
     305#if PLATFORM(IOS_FAMILY)
     306    void processWasUnexpectedlyUnsuspended(CompletionHandler<void()>&&);
     307#endif
     308
    304309protected:
    305310    static uint64_t generatePageID();
    … …  
    449454    BackgroundWebProcessToken m_backgroundToken;
    450455    bool m_hasSentMessageToUnblockAccessibilityServer { false };
     456    std::unique_ptr<WebCore::DeferrableOneShotTimer> m_unexpectedActivityTimer;
    451457#endif
    452458

  • trunk/Source/WebKit/UIProcess/WebProcessProxy.messages.in

    r244085 r244091  
    8484    DidCreateContextForVisibilityPropagation(WebKit::LayerHostingContextID contextID);
    8585#endif
     86
     87#if PLATFORM(IOS_FAMILY)
     88    ProcessWasUnexpectedlyUnsuspended() -> () Async
     89#endif
    8690}

  • trunk/Source/WebKit/UIProcess/ios/ProcessAssertionIOS.mm

    r242728 r244091  
    147147}
    148148
    149 static BKSProcessAssertionReason reasonForState(AssertionState assertionState)
     149static AssertionReason reasonForState(AssertionState assertionState)
    150150{
    151151    switch (assertionState) {
    152152    case AssertionState::UnboundedNetworking:
    153         return BKSProcessAssertionReasonFinishTaskUnbounded;
     153        return AssertionReason::FinishTaskUnbounded;
    154154    case AssertionState::Suspended:
    155155    case AssertionState::Background:
    156156    case AssertionState::Foreground:
     157        return AssertionReason::Extension;
     158    }
     159}
     160
     161static BKSProcessAssertionReason toBKSProcessAssertionReason(AssertionReason reason)
     162{
     163    switch (reason) {
     164    case AssertionReason::Extension:
    157165        return BKSProcessAssertionReasonExtension;
     166    case AssertionReason::FinishTask:
     167        return BKSProcessAssertionReasonFinishTask;
     168    case AssertionReason::FinishTaskUnbounded:
     169        return BKSProcessAssertionReasonFinishTaskUnbounded;
    158170    }
    159171}
    160172
    161173ProcessAssertion::ProcessAssertion(pid_t pid, const String& name, AssertionState assertionState)
     174    : ProcessAssertion(pid, name, assertionState, reasonForState(assertionState))
     175{
     176}
     177
     178ProcessAssertion::ProcessAssertion(pid_t pid, const String& name, AssertionState assertionState, AssertionReason assertionReason)
    162179    : m_assertionState(assertionState)
    163180{
    … …  
    174191    RELEASE_LOG(ProcessSuspension, "%p - ProcessAssertion() PID %d acquiring assertion for process with PID %d, name '%s'", this, getpid(), pid, name.utf8().data());
    175192   
    176     m_assertion = adoptNS([[BKSProcessAssertion alloc] initWithPID:pid flags:flagsForState(assertionState) reason:reasonForState(assertionState) name:(NSString *)name withHandler:handler]);
     193    m_assertion = adoptNS([[BKSProcessAssertion alloc] initWithPID:pid flags:flagsForState(assertionState) reason:toBKSProcessAssertionReason(assertionReason) name:(NSString *)name withHandler:handler]);
    177194    m_assertion.get().invalidationHandler = ^() {
    178195        dispatch_async(dispatch_get_main_queue(), ^{

  • trunk/Source/WebKit/WebKit.xcodeproj/project.pbxproj

    r243932 r244091  
    15621562                CD19A26E1A13E834008D650E /* WebDiagnosticLoggingClient.h in Headers */ = {isa = PBXBuildFile; fileRef = CD19A26A1A13E821008D650E /* WebDiagnosticLoggingClient.h */; };
    15631563                CD19D2EA2046406F0017074A /* FullscreenTouchSecheuristic.h in Headers */ = {isa = PBXBuildFile; fileRef = CD19D2E82046406F0017074A /* FullscreenTouchSecheuristic.h */; };
     1564                CD2865EE2255562000606AC7 /* ProcessTaskStateObserver.h in Headers */ = {isa = PBXBuildFile; fileRef = CD2865EC2255562000606AC7 /* ProcessTaskStateObserver.h */; };
     1565                CD2865EF2255562000606AC7 /* ProcessTaskStateObserver.mm in Sources */ = {isa = PBXBuildFile; fileRef = CD2865ED2255562000606AC7 /* ProcessTaskStateObserver.mm */; };
    15641566                CD491B081E70D05F00009066 /* UserMediaCaptureManager.h in Headers */ = {isa = PBXBuildFile; fileRef = CD491B061E70D05F00009066 /* UserMediaCaptureManager.h */; };
    15651567                CD491B0D1E732E4D00009066 /* UserMediaCaptureManagerMessageReceiver.cpp in Sources */ = {isa = PBXBuildFile; fileRef = CD491B0B1E732E4D00009066 /* UserMediaCaptureManagerMessageReceiver.cpp */; };
    … …  
    44184420                CD19D2E82046406F0017074A /* FullscreenTouchSecheuristic.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; name = FullscreenTouchSecheuristic.h; path = ios/fullscreen/FullscreenTouchSecheuristic.h; sourceTree = "<group>"; };
    44194421                CD19D2E92046406F0017074A /* FullscreenTouchSecheuristic.cpp */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.cpp; name = FullscreenTouchSecheuristic.cpp; path = ios/fullscreen/FullscreenTouchSecheuristic.cpp; sourceTree = "<group>"; };
     4422                CD2865EC2255562000606AC7 /* ProcessTaskStateObserver.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = ProcessTaskStateObserver.h; sourceTree = "<group>"; };
     4423                CD2865ED2255562000606AC7 /* ProcessTaskStateObserver.mm */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.objcpp; path = ProcessTaskStateObserver.mm; sourceTree = "<group>"; };
    44204424                CD491B051E70D05F00009066 /* UserMediaCaptureManager.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = UserMediaCaptureManager.cpp; sourceTree = "<group>"; };
    44214425                CD491B061E70D05F00009066 /* UserMediaCaptureManager.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = UserMediaCaptureManager.h; sourceTree = "<group>"; };
    … …  
    63146318                                C55F916D1C595E440029E92D /* DataDetectionResult.mm */,
    63156319                                2D1087621D2C641B00B85F82 /* LoadParametersCocoa.mm */,
     6320                                CD2865EC2255562000606AC7 /* ProcessTaskStateObserver.h */,
     6321                                CD2865ED2255562000606AC7 /* ProcessTaskStateObserver.mm */,
    63166322                                CD4B4D9A1E765E0000D27092 /* SharedRingBufferStorage.cpp */,
    63176323                                CD4B4D9B1E765E0000D27092 /* SharedRingBufferStorage.h */,
    … …  
    93989404                                86F9536518FF58F5001DB2EF /* ProcessAssertion.h in Headers */,
    93999405                                BC1A7C581136E19C00FB7167 /* ProcessLauncher.h in Headers */,
     9406                                CD2865EE2255562000606AC7 /* ProcessTaskStateObserver.h in Headers */,
    94009407                                463FD4821EB94EC000A2982C /* ProcessTerminationReason.h in Headers */,
    94019408                                86E67A251910B9D100004AB7 /* ProcessThrottler.h in Headers */,
    … …  
    1097310980                                2D91344D212CF9F000128AFD /* PluginView.cpp in Sources */,
    1097410981                                2D54C31B212F4DA60049C174 /* ProcessLauncher.cpp in Sources */,
     10982                                CD2865EF2255562000606AC7 /* ProcessTaskStateObserver.mm in Sources */,
    1097510983                                2D72A1FA212BF46E00517A20 /* RemoteLayerTreeDrawingArea.mm in Sources */,
    1097610984                                0FF24A2D1879E4BC003ABF0C /* RemoteLayerTreeDrawingAreaProxyMessageReceiver.cpp in Sources */,

  • trunk/Source/WebKit/WebProcess/WebProcess.cpp

    r243958 r244091  
    14511451{
    14521452    SetForScope<bool> suspensionScope(m_isSuspending, true);
     1453    m_processIsSuspended = true;
    14531454
    14541455#if ENABLE(VIDEO)
    … …  
    15121513{
    15131514    RELEASE_LOG(ProcessSuspension, "%p - WebProcess::cancelPrepareToSuspend()", this);
     1515
     1516    m_processIsSuspended = false;
     1517
    15141518    unfreezeAllLayerTrees();
    15151519
    … …  
    15851589    RELEASE_LOG(ProcessSuspension, "%p - WebProcess::processDidResume()", this);
    15861590
     1591    m_processIsSuspended = false;
     1592
    15871593    cancelMarkAllLayersVolatile();
    15881594    unfreezeAllLayerTrees();

  • trunk/Source/WebKit/WebProcess/WebProcess.h

    r244085 r244091  
    5656#include <dispatch/dispatch.h>
    5757#include <wtf/MachSendRight.h>
     58#endif
     59
     60#if PLATFORM(IOS_FAMILY)
     61#include "ProcessTaskStateObserver.h"
    5862#endif
    5963
    … …  
    117121#endif
    118122
    119 class WebProcess : public AuxiliaryProcess {
     123class WebProcess
     124    : public AuxiliaryProcess
     125#if PLATFORM(IOS_FAMILY)
     126    , ProcessTaskStateObserver::Client
     127#endif
     128{
    120129public:
    121130    static WebProcess& singleton();
    … …  
    430439
    431440#if PLATFORM(IOS_FAMILY)
     441    void processTaskStateDidChange(ProcessTaskStateObserver::TaskState) final;
    432442    bool shouldFreezeOnSuspension() const;
    433443    void updateFreezerStatus();
    … …  
    495505#endif
    496506
     507    bool m_processIsSuspended { false };
     508
    497509    HashSet<uint64_t> m_pagesInWindows;
    498510    WebCore::Timer m_nonVisibleProcessCleanupTimer;
    … …  
    502514#if PLATFORM(IOS_FAMILY)
    503515    std::unique_ptr<WebSQLiteDatabaseTracker> m_webSQLiteDatabaseTracker;
     516    ProcessTaskStateObserver m_taskStateObserver { *this };
    504517#endif
    505518#if HAVE(VISIBILITY_PROPAGATION_VIEW)

  • trunk/Source/WebKit/WebProcess/cocoa/WebProcessCocoa.mm

    r244085 r244091  
    3232#import "Logging.h"
    3333#import "ObjCObjectGraph.h"
     34#import "ProcessAssertion.h"
    3435#import "SandboxExtension.h"
    3536#import "SandboxInitializationParameters.h"
    … …  
    288289}
    289290
     291#if PLATFORM(IOS_FAMILY)
     292void WebProcess::processTaskStateDidChange(ProcessTaskStateObserver::TaskState taskState)
     293{
     294    RELEASE_LOG(ProcessSuspension, "%p - WebProcess::processTaskStateDidChange() - taskState(%d)", this, taskState);
     295    if (taskState == ProcessTaskStateObserver::None)
     296        return;
     297
     298    if (taskState == ProcessTaskStateObserver::Suspended) {
     299        if (m_processIsSuspended)
     300            return;
     301
     302        RELEASE_LOG(ProcessSuspension, "%p - WebProcess::processTaskStateChanged() - unexpectedly entered Suspended state", this);
     303        return;
     304    }
     305
     306    if (!m_processIsSuspended)
     307        return;
     308
     309    // We were awakened from suspension unexpectedly. Notify the WebProcessProxy, but take a process assertion on our parent PID
     310    // to ensure that it too is awakened.
     311    auto uiProcessAssertion = std::make_unique<ProcessAssertion>(parentProcessConnection()->remoteProcessID(), "Unexpectedly resumed", AssertionState::Background, AssertionReason::FinishTask);
     312    parentProcessConnection()->sendWithAsyncReply(Messages::WebProcessProxy::ProcessWasUnexpectedlyUnsuspended(), [uiProcessAssertion = WTFMove(uiProcessAssertion)] { });
     313}
     314#endif
     315
    290316static void registerWithAccessibility()
    291317{
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