| // Copyright 2012 The Chromium Authors |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef IPC_IPC_SYNC_MESSAGE_H_ |
| #define IPC_IPC_SYNC_MESSAGE_H_ |
| |
| #include <stdint.h> |
| |
| #include <memory> |
| |
| #include "build/build_config.h" |
| |
| #if BUILDFLAG(IS_WIN) |
| #include "base/win/windows_types.h" |
| #endif |
| |
| #include <memory> |
| #include <string> |
| |
| #include "build/build_config.h" |
| #include "ipc/ipc_message.h" |
| #include "ipc/ipc_message_support_export.h" |
| |
| namespace base { |
| class WaitableEvent; |
| } |
| |
| namespace IPC { |
| |
| class MessageReplyDeserializer; |
| |
| class IPC_MESSAGE_SUPPORT_EXPORT SyncMessage : public Message { |
| public: |
| SyncMessage(int32_t routing_id, |
| uint32_t type, |
| PriorityValue priority, |
| std::unique_ptr<MessageReplyDeserializer> deserializer); |
| ~SyncMessage() override; |
| |
| // Call this to get a deserializer for the output parameters. |
| // Note that this can only be called once, and the caller is takes |
| // ownership of the deserializer.. |
| std::unique_ptr<MessageReplyDeserializer> TakeReplyDeserializer(); |
| |
| // Returns true if the message is a reply to the given request id. |
| static bool IsMessageReplyTo(const Message& msg, int request_id); |
| |
| // Given a reply message, returns an iterator to the beginning of the data |
| // (i.e. skips over the synchronous specific data). |
| static base::PickleIterator GetDataIterator(const Message* msg); |
| |
| // Given a synchronous message (or its reply), returns its id. |
| static int GetMessageId(const Message& msg); |
| |
| // Generates a reply message to the given message. |
| static Message* GenerateReply(const Message* msg); |
| |
| private: |
| struct SyncHeader { |
| // unique ID (unique per sender) |
| int message_id; |
| }; |
| |
| static bool ReadSyncHeader(const Message& msg, SyncHeader* header); |
| static bool WriteSyncHeader(Message* msg, const SyncHeader& header); |
| |
| std::unique_ptr<MessageReplyDeserializer> deserializer_; |
| }; |
| |
| // Used to deserialize parameters from a reply to a synchronous message |
| class IPC_MESSAGE_SUPPORT_EXPORT MessageReplyDeserializer { |
| public: |
| virtual ~MessageReplyDeserializer() {} |
| bool SerializeOutputParameters(const Message& msg); |
| private: |
| // Derived classes need to implement this, using the given iterator (which |
| // is skipped past the header for synchronous messages). |
| virtual bool SerializeOutputParameters(const Message& msg, |
| base::PickleIterator iter) = 0; |
| }; |
| |
| // When sending a synchronous message, this structure contains an object |
| // that knows how to deserialize the response. |
| struct IPC_MESSAGE_SUPPORT_EXPORT PendingSyncMsg { |
| PendingSyncMsg(int id, |
| std::unique_ptr<MessageReplyDeserializer> d, |
| std::unique_ptr<base::WaitableEvent> e); |
| PendingSyncMsg(PendingSyncMsg&& that); |
| ~PendingSyncMsg(); |
| |
| int id; |
| bool send_result = false; |
| std::unique_ptr<MessageReplyDeserializer> deserializer; |
| std::unique_ptr<base::WaitableEvent> done_event; |
| }; |
| |
| } // namespace IPC |
| |
| #endif // IPC_IPC_SYNC_MESSAGE_H_ |