| /* |
| * Copyright (C) 2010-2018 Apple Inc. All rights reserved. |
| * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies) |
| * Portions Copyright (c) 2010 Motorola Mobility, Inc. All rights reserved. |
| * Copyright (C) 2017 Sony Interactive Entertainment Inc. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, |
| * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS |
| * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF |
| * THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #pragma once |
| |
| #include "Decoder.h" |
| #include "Encoder.h" |
| #include "HandleMessage.h" |
| #include "MessageReceiver.h" |
| #include <WebCore/ScriptDisallowedScope.h> |
| #include <atomic> |
| #include <wtf/Condition.h> |
| #include <wtf/Deque.h> |
| #include <wtf/Forward.h> |
| #include <wtf/HashMap.h> |
| #include <wtf/Lock.h> |
| #include <wtf/ObjectIdentifier.h> |
| #include <wtf/OptionSet.h> |
| #include <wtf/RunLoop.h> |
| #include <wtf/WorkQueue.h> |
| #include <wtf/text/CString.h> |
| |
| #if OS(DARWIN) && !USE(UNIX_DOMAIN_SOCKETS) |
| #include <mach/mach_port.h> |
| #include <wtf/OSObjectPtr.h> |
| #include <wtf/spi/darwin/XPCSPI.h> |
| #endif |
| |
| #if USE(GLIB) |
| #include "GSocketMonitor.h" |
| #endif |
| |
| namespace IPC { |
| |
| enum class SendOption { |
| // Whether this message should be dispatched when waiting for a sync reply. |
| // This is the default for synchronous messages. |
| DispatchMessageEvenWhenWaitingForSyncReply = 1 << 0, |
| DispatchMessageEvenWhenWaitingForUnboundedSyncReply = 1 << 1, |
| IgnoreFullySynchronousMode = 1 << 2, |
| }; |
| |
| enum class SendSyncOption { |
| // Use this to inform that this sync call will suspend this process until the user responds with input. |
| InformPlatformProcessWillSuspend = 1 << 0, |
| UseFullySynchronousModeForTesting = 1 << 1, |
| ForceDispatchWhenDestinationIsWaitingForUnboundedSyncReply = 1 << 2, |
| }; |
| |
| enum class WaitForOption { |
| // Use this to make waitForMessage be interrupted immediately by any incoming sync messages. |
| InterruptWaitingIfSyncMessageArrives = 1 << 0, |
| }; |
| |
| #define MESSAGE_CHECK_BASE(assertion, connection) do \ |
| if (!(assertion)) { \ |
| ASSERT(assertion); \ |
| (connection)->markCurrentlyDispatchedMessageAsInvalid(); \ |
| return; \ |
| } \ |
| while (0) |
| |
| template<typename AsyncReplyResult> struct AsyncReplyError { |
| static AsyncReplyResult create() { return { }; }; |
| }; |
| |
| class MachMessage; |
| class UnixMessage; |
| |
| class Connection : public ThreadSafeRefCounted<Connection, WTF::DestructionThread::MainRunLoop> { |
| public: |
| class Client : public MessageReceiver { |
| public: |
| virtual void didClose(Connection&) = 0; |
| virtual void didReceiveInvalidMessage(Connection&, StringReference messageReceiverName, StringReference messageName) = 0; |
| |
| protected: |
| virtual ~Client() { } |
| }; |
| |
| class WorkQueueMessageReceiver : public MessageReceiver, public ThreadSafeRefCounted<WorkQueueMessageReceiver> { |
| }; |
| |
| #if USE(UNIX_DOMAIN_SOCKETS) |
| typedef int Identifier; |
| static bool identifierIsValid(Identifier identifier) { return identifier != -1; } |
| |
| struct SocketPair { |
| int client; |
| int server; |
| }; |
| |
| enum ConnectionOptions { |
| SetCloexecOnClient = 1 << 0, |
| SetCloexecOnServer = 1 << 1, |
| }; |
| |
| static Connection::SocketPair createPlatformConnection(unsigned options = SetCloexecOnClient | SetCloexecOnServer); |
| #elif OS(DARWIN) |
| struct Identifier { |
| Identifier() |
| { |
| } |
| |
| Identifier(mach_port_t port) |
| : port(port) |
| { |
| } |
| |
| Identifier(mach_port_t port, OSObjectPtr<xpc_connection_t> xpcConnection) |
| : port(port) |
| , xpcConnection(WTFMove(xpcConnection)) |
| { |
| } |
| |
| mach_port_t port { MACH_PORT_NULL }; |
| OSObjectPtr<xpc_connection_t> xpcConnection; |
| }; |
| static bool identifierIsValid(Identifier identifier) { return MACH_PORT_VALID(identifier.port); } |
| xpc_connection_t xpcConnection() const { return m_xpcConnection.get(); } |
| Optional<audit_token_t> getAuditToken(); |
| pid_t remoteProcessID() const; |
| #elif OS(WINDOWS) |
| typedef HANDLE Identifier; |
| static bool createServerAndClientIdentifiers(Identifier& serverIdentifier, Identifier& clientIdentifier); |
| static bool identifierIsValid(Identifier identifier) { return !!identifier; } |
| #endif |
| |
| static Ref<Connection> createServerConnection(Identifier, Client&); |
| static Ref<Connection> createClientConnection(Identifier, Client&); |
| ~Connection(); |
| |
| Client& client() const { return m_client; } |
| |
| enum UniqueIDType { }; |
| using UniqueID = ObjectIdentifier<UniqueIDType>; |
| |
| static Connection* connection(UniqueID); |
| UniqueID uniqueID() const { return m_uniqueID; } |
| |
| void setOnlySendMessagesAsDispatchWhenWaitingForSyncReplyWhenProcessingSuchAMessage(bool); |
| void setShouldExitOnSyncMessageSendFailure(bool); |
| |
| // The set callback will be called on the connection work queue when the connection is closed, |
| // before didCall is called on the client thread. Must be called before the connection is opened. |
| // In the future we might want a more generic way to handle sync or async messages directly |
| // on the work queue, for example if we want to handle them on some other thread we could avoid |
| // handling the message on the client thread first. |
| typedef void (*DidCloseOnConnectionWorkQueueCallback)(Connection*); |
| void setDidCloseOnConnectionWorkQueueCallback(DidCloseOnConnectionWorkQueueCallback); |
| |
| void addWorkQueueMessageReceiver(StringReference messageReceiverName, WorkQueue&, WorkQueueMessageReceiver*); |
| void removeWorkQueueMessageReceiver(StringReference messageReceiverName); |
| |
| bool open(); |
| void invalidate(); |
| void markCurrentlyDispatchedMessageAsInvalid(); |
| |
| void postConnectionDidCloseOnConnectionWorkQueue(); |
| |
| template<typename T, typename C> void sendWithAsyncReply(T&& message, C&& completionHandler, uint64_t destinationID = 0, OptionSet<SendOption> = { }); |
| template<typename T> bool send(T&& message, uint64_t destinationID, OptionSet<SendOption> sendOptions = { }); |
| template<typename T> bool sendSync(T&& message, typename T::Reply&& reply, uint64_t destinationID, Seconds timeout = Seconds::infinity(), OptionSet<SendSyncOption> sendSyncOptions = { }); |
| template<typename T> bool waitForAndDispatchImmediately(uint64_t destinationID, Seconds timeout, OptionSet<WaitForOption> waitForOptions = { }); |
| |
| template<typename T, typename C, typename U> |
| void sendWithAsyncReply(T&& message, C&& completionHandler, ObjectIdentifier<U> destinationID = { }, OptionSet<SendOption> sendOptions = { }) |
| { |
| sendWithAsyncReply<T, C>(WTFMove(message), WTFMove(completionHandler), destinationID.toUInt64(), sendOptions); |
| } |
| |
| template<typename T, typename U> |
| bool send(T&& message, ObjectIdentifier<U> destinationID, OptionSet<SendOption> sendOptions = { }) |
| { |
| return send<T>(WTFMove(message), destinationID.toUInt64(), sendOptions); |
| } |
| |
| template<typename T, typename U> |
| bool sendSync(T&& message, typename T::Reply&& reply, ObjectIdentifier<U> destinationID, Seconds timeout = Seconds::infinity(), OptionSet<SendSyncOption> sendSyncOptions = { }) |
| { |
| return sendSync<T>(WTFMove(message), WTFMove(reply), destinationID.toUInt64(), timeout, sendSyncOptions); |
| } |
| |
| template<typename T, typename U> |
| bool waitForAndDispatchImmediately(ObjectIdentifier<U> destinationID, Seconds timeout, OptionSet<WaitForOption> waitForOptions = { }) |
| { |
| return waitForAndDispatchImmediately<T>(destinationID.toUInt64(), timeout, waitForOptions); |
| } |
| |
| bool sendMessage(std::unique_ptr<Encoder>, OptionSet<SendOption> sendOptions); |
| std::unique_ptr<Encoder> createSyncMessageEncoder(StringReference messageReceiverName, StringReference messageName, uint64_t destinationID, uint64_t& syncRequestID); |
| std::unique_ptr<Decoder> sendSyncMessage(uint64_t syncRequestID, std::unique_ptr<Encoder>, Seconds timeout, OptionSet<SendSyncOption> sendSyncOptions); |
| bool sendSyncReply(std::unique_ptr<Encoder>); |
| |
| void wakeUpRunLoop(); |
| |
| void incrementDispatchMessageMarkedDispatchWhenWaitingForSyncReplyCount() { ++m_inDispatchMessageMarkedDispatchWhenWaitingForSyncReplyCount; } |
| void decrementDispatchMessageMarkedDispatchWhenWaitingForSyncReplyCount() { --m_inDispatchMessageMarkedDispatchWhenWaitingForSyncReplyCount; } |
| |
| bool inSendSync() const { return m_inSendSyncCount; } |
| |
| Identifier identifier() const; |
| |
| #if PLATFORM(COCOA) |
| bool kill(); |
| void terminateSoon(Seconds); |
| #endif |
| |
| bool isValid() const { return m_isValid; } |
| |
| #if HAVE(QOS_CLASSES) |
| void setShouldBoostMainThreadOnSyncMessage(bool b) { m_shouldBoostMainThreadOnSyncMessage = b; } |
| #endif |
| |
| uint64_t installIncomingSyncMessageCallback(WTF::Function<void()>&&); |
| void uninstallIncomingSyncMessageCallback(uint64_t); |
| bool hasIncomingSyncMessage(); |
| |
| void allowFullySynchronousModeForTesting() { m_fullySynchronousModeIsAllowedForTesting = true; } |
| |
| void ignoreTimeoutsForTesting() { m_ignoreTimeoutsForTesting = true; } |
| |
| void enableIncomingMessagesThrottling(); |
| |
| private: |
| Connection(Identifier, bool isServer, Client&); |
| void platformInitialize(Identifier); |
| void platformInvalidate(); |
| |
| std::unique_ptr<Decoder> waitForMessage(StringReference messageReceiverName, StringReference messageName, uint64_t destinationID, Seconds timeout, OptionSet<WaitForOption>); |
| |
| std::unique_ptr<Decoder> waitForSyncReply(uint64_t syncRequestID, Seconds timeout, OptionSet<SendSyncOption>); |
| |
| bool dispatchMessageToWorkQueueReceiver(std::unique_ptr<Decoder>&); |
| |
| // Called on the connection work queue. |
| void processIncomingMessage(std::unique_ptr<Decoder>); |
| void processIncomingSyncReply(std::unique_ptr<Decoder>); |
| |
| void dispatchWorkQueueMessageReceiverMessage(WorkQueueMessageReceiver&, Decoder&); |
| |
| bool canSendOutgoingMessages() const; |
| bool platformCanSendOutgoingMessages() const; |
| void sendOutgoingMessages(); |
| bool sendOutgoingMessage(std::unique_ptr<Encoder>); |
| void connectionDidClose(); |
| |
| // Called on the listener thread. |
| void dispatchOneIncomingMessage(); |
| void dispatchIncomingMessages(); |
| void dispatchMessage(std::unique_ptr<Decoder>); |
| void dispatchMessage(Decoder&); |
| void dispatchSyncMessage(Decoder&); |
| void dispatchDidReceiveInvalidMessage(const CString& messageReceiverNameString, const CString& messageNameString); |
| void didFailToSendSyncMessage(); |
| |
| // Can be called on any thread. |
| void enqueueIncomingMessage(std::unique_ptr<Decoder>); |
| size_t incomingMessagesDispatchingBatchSize() const; |
| |
| void willSendSyncMessage(OptionSet<SendSyncOption>); |
| void didReceiveSyncReply(OptionSet<SendSyncOption>); |
| |
| Seconds timeoutRespectingIgnoreTimeoutsForTesting(Seconds) const; |
| |
| #if PLATFORM(COCOA) |
| bool sendMessage(std::unique_ptr<MachMessage>); |
| #endif |
| |
| class MessagesThrottler { |
| WTF_MAKE_FAST_ALLOCATED; |
| public: |
| typedef void (Connection::*DispatchMessagesFunction)(); |
| MessagesThrottler(Connection&, DispatchMessagesFunction); |
| |
| size_t numberOfMessagesToProcess(size_t totalMessages); |
| void scheduleMessagesDispatch(); |
| |
| private: |
| RunLoop::Timer<Connection> m_dispatchMessagesTimer; |
| Connection& m_connection; |
| DispatchMessagesFunction m_dispatchMessages; |
| unsigned m_throttlingLevel { 0 }; |
| }; |
| |
| Client& m_client; |
| UniqueID m_uniqueID; |
| bool m_isServer; |
| std::atomic<bool> m_isValid { true }; |
| std::atomic<uint64_t> m_syncRequestID; |
| |
| bool m_onlySendMessagesAsDispatchWhenWaitingForSyncReplyWhenProcessingSuchAMessage; |
| bool m_shouldExitOnSyncMessageSendFailure; |
| DidCloseOnConnectionWorkQueueCallback m_didCloseOnConnectionWorkQueueCallback; |
| |
| bool m_isConnected; |
| Ref<WorkQueue> m_connectionQueue; |
| |
| Lock m_workQueueMessageReceiversMutex; |
| using WorkQueueMessageReceiverMap = HashMap<StringReference, std::pair<RefPtr<WorkQueue>, RefPtr<WorkQueueMessageReceiver>>>; |
| WorkQueueMessageReceiverMap m_workQueueMessageReceivers; |
| |
| unsigned m_inSendSyncCount; |
| unsigned m_inDispatchMessageCount; |
| unsigned m_inDispatchMessageMarkedDispatchWhenWaitingForSyncReplyCount; |
| unsigned m_inDispatchMessageMarkedToUseFullySynchronousModeForTesting { 0 }; |
| bool m_fullySynchronousModeIsAllowedForTesting { false }; |
| bool m_ignoreTimeoutsForTesting { false }; |
| bool m_didReceiveInvalidMessage; |
| |
| // Incoming messages. |
| Lock m_incomingMessagesMutex; |
| Deque<std::unique_ptr<Decoder>> m_incomingMessages; |
| std::unique_ptr<MessagesThrottler> m_incomingMessagesThrottler; |
| |
| // Outgoing messages. |
| Lock m_outgoingMessagesMutex; |
| Deque<std::unique_ptr<Encoder>> m_outgoingMessages; |
| |
| Condition m_waitForMessageCondition; |
| Lock m_waitForMessageMutex; |
| |
| struct WaitForMessageState; |
| WaitForMessageState* m_waitingForMessage { nullptr }; |
| |
| class SyncMessageState; |
| |
| Lock m_syncReplyStateMutex; |
| bool m_shouldWaitForSyncReplies; |
| bool m_shouldWaitForMessages; |
| struct PendingSyncReply; |
| Vector<PendingSyncReply> m_pendingSyncReplies; |
| |
| Lock m_incomingSyncMessageCallbackMutex; |
| HashMap<uint64_t, WTF::Function<void()>> m_incomingSyncMessageCallbacks; |
| RefPtr<WorkQueue> m_incomingSyncMessageCallbackQueue; |
| uint64_t m_nextIncomingSyncMessageCallbackID { 0 }; |
| |
| #if HAVE(QOS_CLASSES) |
| pthread_t m_mainThread { 0 }; |
| bool m_shouldBoostMainThreadOnSyncMessage { false }; |
| #endif |
| |
| #if USE(UNIX_DOMAIN_SOCKETS) |
| // Called on the connection queue. |
| void readyReadHandler(); |
| bool processMessage(); |
| bool sendOutputMessage(UnixMessage&); |
| |
| Vector<uint8_t> m_readBuffer; |
| Vector<int> m_fileDescriptors; |
| int m_socketDescriptor; |
| std::unique_ptr<UnixMessage> m_pendingOutputMessage; |
| #if USE(GLIB) |
| GRefPtr<GSocket> m_socket; |
| GSocketMonitor m_readSocketMonitor; |
| GSocketMonitor m_writeSocketMonitor; |
| #endif |
| #elif OS(DARWIN) |
| // Called on the connection queue. |
| void receiveSourceEventHandler(); |
| void initializeSendSource(); |
| void resumeSendSource(); |
| void cancelReceiveSource(); |
| |
| mach_port_t m_sendPort { MACH_PORT_NULL }; |
| dispatch_source_t m_sendSource { nullptr }; |
| |
| mach_port_t m_receivePort { MACH_PORT_NULL }; |
| dispatch_source_t m_receiveSource { nullptr }; |
| |
| std::unique_ptr<MachMessage> m_pendingOutgoingMachMessage; |
| bool m_isInitializingSendSource { false }; |
| |
| OSObjectPtr<xpc_connection_t> m_xpcConnection; |
| bool m_wasKilled { false }; |
| #elif OS(WINDOWS) |
| // Called on the connection queue. |
| void readEventHandler(); |
| void writeEventHandler(); |
| void invokeReadEventHandler(); |
| void invokeWriteEventHandler(); |
| |
| class EventListener { |
| public: |
| void open(Function<void()>&&); |
| void close(); |
| |
| OVERLAPPED& state() { return m_state; } |
| |
| private: |
| static void callback(void*, BOOLEAN); |
| |
| OVERLAPPED m_state; |
| HANDLE m_waitHandle { INVALID_HANDLE_VALUE }; |
| Function<void()> m_handler; |
| }; |
| |
| Vector<uint8_t> m_readBuffer; |
| EventListener m_readListener; |
| std::unique_ptr<Encoder> m_pendingWriteEncoder; |
| EventListener m_writeListener; |
| HANDLE m_connectionPipe { INVALID_HANDLE_VALUE }; |
| #endif |
| }; |
| |
| template<typename T> |
| bool Connection::send(T&& message, uint64_t destinationID, OptionSet<SendOption> sendOptions) |
| { |
| COMPILE_ASSERT(!T::isSync, AsyncMessageExpected); |
| |
| auto encoder = makeUnique<Encoder>(T::receiverName(), T::name(), destinationID); |
| encoder->encode(message.arguments()); |
| |
| return sendMessage(WTFMove(encoder), sendOptions); |
| } |
| |
| uint64_t nextAsyncReplyHandlerID(); |
| void addAsyncReplyHandler(Connection&, uint64_t, CompletionHandler<void(Decoder*)>&&); |
| CompletionHandler<void(Decoder*)> takeAsyncReplyHandler(Connection&, uint64_t); |
| |
| template<typename T, typename C> |
| void Connection::sendWithAsyncReply(T&& message, C&& completionHandler, uint64_t destinationID, OptionSet<SendOption> sendOptions) |
| { |
| COMPILE_ASSERT(!T::isSync, AsyncMessageExpected); |
| |
| auto encoder = makeUnique<Encoder>(T::receiverName(), T::name(), destinationID); |
| uint64_t listenerID = nextAsyncReplyHandlerID(); |
| encoder->encode(listenerID); |
| encoder->encode(message.arguments()); |
| sendMessage(WTFMove(encoder), sendOptions); |
| addAsyncReplyHandler(*this, listenerID, [completionHandler = WTFMove(completionHandler)] (Decoder* decoder) mutable { |
| if (decoder && !decoder->isInvalid()) |
| T::callReply(*decoder, WTFMove(completionHandler)); |
| else |
| T::cancelReply(WTFMove(completionHandler)); |
| }); |
| } |
| |
| template<size_t i, typename A, typename B> struct TupleMover { |
| static void move(A&& a, B& b) |
| { |
| std::get<i - 1>(b) = WTFMove(std::get<i - 1>(a)); |
| TupleMover<i - 1, A, B>::move(WTFMove(a), b); |
| } |
| }; |
| |
| template<typename A, typename B> struct TupleMover<0, A, B> { |
| static void move(A&&, B&) { } |
| }; |
| |
| template<typename... A, typename... B> |
| void moveTuple(std::tuple<A...>&& a, std::tuple<B...>& b) |
| { |
| static_assert(sizeof...(A) == sizeof...(B), "Should be used with two tuples of same size"); |
| TupleMover<sizeof...(A), std::tuple<A...>, std::tuple<B...>>::move(WTFMove(a), b); |
| } |
| |
| template<typename T> bool Connection::sendSync(T&& message, typename T::Reply&& reply, uint64_t destinationID, Seconds timeout, OptionSet<SendSyncOption> sendSyncOptions) |
| { |
| COMPILE_ASSERT(T::isSync, SyncMessageExpected); |
| |
| uint64_t syncRequestID = 0; |
| std::unique_ptr<Encoder> encoder = createSyncMessageEncoder(T::receiverName(), T::name(), destinationID, syncRequestID); |
| |
| if (sendSyncOptions.contains(SendSyncOption::UseFullySynchronousModeForTesting)) { |
| encoder->setFullySynchronousModeForTesting(); |
| m_fullySynchronousModeIsAllowedForTesting = true; |
| } |
| |
| // Encode the rest of the input arguments. |
| encoder->encode(message.arguments()); |
| |
| // Now send the message and wait for a reply. |
| std::unique_ptr<Decoder> replyDecoder = sendSyncMessage(syncRequestID, WTFMove(encoder), timeout, sendSyncOptions); |
| if (!replyDecoder) |
| return false; |
| |
| // Decode the reply. |
| Optional<typename T::ReplyArguments> replyArguments; |
| *replyDecoder >> replyArguments; |
| if (!replyArguments) |
| return false; |
| moveTuple(WTFMove(*replyArguments), reply); |
| return true; |
| } |
| |
| template<typename T> bool Connection::waitForAndDispatchImmediately(uint64_t destinationID, Seconds timeout, OptionSet<WaitForOption> waitForOptions) |
| { |
| std::unique_ptr<Decoder> decoder = waitForMessage(T::receiverName(), T::name(), destinationID, timeout, waitForOptions); |
| if (!decoder) |
| return false; |
| |
| ASSERT(decoder->destinationID() == destinationID); |
| m_client.didReceiveMessage(*this, *decoder); |
| return true; |
| } |
| |
| class UnboundedSynchronousIPCScope { |
| public: |
| UnboundedSynchronousIPCScope() |
| { |
| ASSERT(RunLoop::isMain()); |
| ++unboundedSynchronousIPCCount; |
| } |
| |
| ~UnboundedSynchronousIPCScope() |
| { |
| ASSERT(RunLoop::isMain()); |
| ASSERT(unboundedSynchronousIPCCount); |
| --unboundedSynchronousIPCCount; |
| } |
| |
| static bool hasOngoingUnboundedSyncIPC() |
| { |
| return unboundedSynchronousIPCCount.load() > 0; |
| } |
| |
| private: |
| static std::atomic<unsigned> unboundedSynchronousIPCCount; |
| }; |
| |
| } // namespace IPC |