Almost rewrote LinkMsgSender; it's now much cleaner and works better:

- StartMessage() can now get a size to make sure there is enough free space
- if StartMessage() is called with the current message behind a certain
  watermark, the buffer is flushed in order to prevent moving around messages
  in the buffer. The actual value should be tested in real life, though.
- enlarged maximum buffer size to 64k
- fixed bug: could use memcpy() to move overlapping memory around
- added a flag to Flush() that marks messages as needing a reply - the other
  way would be to mark the message "code" to contain this information

Some cleanup in LinkMsgReader.
BPortLink now has most methods as inlines.
The buffer sizes are now declared in a shared header, so that receiver and
sender are always equipped equally.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@12997 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/app/LinkMsgReader.h

@@ -1,71 +1,56 @@
-//------------------------------------------------------------------------------
-//	Copyright (c) 2001-2002, Haiku
-//
-//	Permission is hereby granted, free of charge, to any person obtaining a
-//	copy of this software and associated documentation files (the "Software"),
-//	to deal in the Software without restriction, including without limitation
-//	the rights to use, copy, modify, merge, publish, distribute, sublicense,
-//	and/or sell copies of the Software, and to permit persons to whom the
-//	Software is furnished to do so, subject to the following conditions:
-//
-//	The above copyright notice and this permission notice shall be included in
-//	all copies or substantial portions of the Software.
-//
-//	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-//	IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-//	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-//	AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-//	LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
-//	FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
-//	DEALINGS IN THE SOFTWARE.
-//
-//	File Name:		LinkMsgReader.h
-//	Author:			DarkWyrm <[email protected]>
-//					Pahtz <[email protected]>
-//	Description:	Class for receiving low-overhead port-based messages
-//  
-//------------------------------------------------------------------------------
+/*
+ * Copyright 2001-2005, Haiku.
+ * Distributed under the terms of the MIT License.
+ *
+ * Authors:
+ *		DarkWyrm <[email protected]>
+ *		Pahtz <[email protected]>
+ */
 #ifndef _LINKMSGREADER_H
 #define _LINKMSGREADER_H
 
 #include <OS.h>
 
-class LinkMsgReader
-{
-public:
-	LinkMsgReader(port_id port);
-	virtual ~LinkMsgReader(void);
 
-	virtual void SetPort(port_id port);
-	virtual port_id	GetPort(void);
-	
-	virtual status_t GetNextMessage(int32 *code, bigtime_t timeout = B_INFINITE_TIMEOUT);
-	virtual status_t Read(void *data, ssize_t size);
-	virtual status_t ReadString(char **string);
-	template <class Type> status_t Read(Type *data)
-	{
-		return Read(data, sizeof(Type));
-	}
-	
-protected:
-	virtual status_t ReadFromPort(bigtime_t timeout);
-	virtual status_t AdjustReplyBuffer(bigtime_t timeout);
-	void ResetBuffer();
-	
-	port_id fReceivePort;
-	
-	char	*fRecvBuffer;
+//namespace BPrivate {
 
-	int32	fRecvPosition;	//current read position
+class LinkMsgReader {
+	public:
+		LinkMsgReader(port_id port);
+		virtual ~LinkMsgReader(void);
 
-	int32	fRecvStart;	//start of current message
-	
-	int32	fRecvBufferSize;
+		void SetPort(port_id port);
+		port_id	Port(void) { return fReceivePort; }
 
-	int32	fDataSize;	//size of data in recv buffer
-	int32	fReplySize;	//size of current reply message
-	
-	status_t fReadError;	//Read failed for current message
+		status_t GetNextMessage(int32 *code, bigtime_t timeout = B_INFINITE_TIMEOUT);
+		status_t Read(void *data, ssize_t size);
+		status_t ReadString(char **string);
+		template <class Type> status_t Read(Type *data)
+		{
+			return Read(data, sizeof(Type));
+		}
+
+	protected:
+		virtual status_t ReadFromPort(bigtime_t timeout);
+		virtual status_t AdjustReplyBuffer(bigtime_t timeout);
+		void ResetBuffer();
+
+		port_id fReceivePort;
+
+		char	*fRecvBuffer;
+
+		int32	fRecvPosition;	//current read position
+
+		int32	fRecvStart;	//start of current message
+
+		int32	fRecvBufferSize;
+
+		int32	fDataSize;	//size of data in recv buffer
+		int32	fReplySize;	//size of current reply message
+
+		status_t fReadError;	//Read failed for current message
 };
 
+//}	// namespace BPrivate
+
 #endif