WaitableEvent

chrome/common/ipc_sync_message.h

 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_COMMON_IPC_SYNC_MESSAGE_H__
 #define CHROME_COMMON_IPC_SYNC_MESSAGE_H__
 
 #if defined(OS_WIN)
 #include <windows.h>
 #endif
 #include <string>
 #include "base/basictypes.h"
 #include "chrome/common/ipc_message.h"
 
+namespace base {
+class WaitableEvent;
+}
+
 namespace IPC {
 
 class MessageReplyDeserializer;
 
 class SyncMessage : public Message {
  public:
   SyncMessage(int32 routing_id, uint16 type, PriorityValue priority,
               MessageReplyDeserializer* deserializer);
 
   // Call this to get a deserializer for the output parameters.
   // Note that this can only be called once, and the caller is responsible
   // for deleting the deserializer when they're done.
   MessageReplyDeserializer* GetReplyDeserializer();
 
-// TODO(playmobil): reimplement on POSIX.
-#if defined(OS_WIN)
   // If this message can cause the receiver to block while waiting for user
   // input (i.e. by calling MessageBox), then the caller needs to pump window
   // messages and dispatch asynchronous messages while waiting for the reply.
-  // If this handle is passed in, then window messages will start being pumped
+  // If this event is passed in, then window messages will start being pumped
   // when it's set.  Note that this behavior will continue even if the event is
-  // later reset.  The handle must be valid until after the Send call returns.
-  void set_pump_messages_event(HANDLE event) {
+  // later reset.  The event must be valid until after the Send call returns.
+  void set_pump_messages_event(base::WaitableEvent* event) {
     pump_messages_event_ = event;
     if (event) {
       header()->flags |= PUMPING_MSGS_BIT;
     } else {
       header()->flags &= ~PUMPING_MSGS_BIT;
     }
   }
 
   // Call this if you always want to pump messages.  You can call this method
   // or set_pump_messages_event but not both.
   void EnableMessagePumping();
 
-  HANDLE pump_messages_event() const { return pump_messages_event_; }
-#endif  // defined(OS_WIN)
+  base::WaitableEvent* pump_messages_event() const {
+    return pump_messages_event_;
+  }
 
   // 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 void* 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);
 
   MessageReplyDeserializer* deserializer_;
-#if defined(OS_WIN)
-  HANDLE pump_messages_event_;
-#endif
+  base::WaitableEvent* pump_messages_event_;
 
   static uint32 next_id_;  // for generation of unique ids
 };
 
 // Used to deserialize parameters from a reply to a synchronous message
 class MessageReplyDeserializer {
  public:
   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, void* iter) = 0;
 };
 
 }  // namespace IPC
 
 #endif  // CHROME_COMMON_IPC_SYNC_MESSAGE_H__