[PATCH] Async IO on regular files

[Martin Wilck]

This patch implements asynchronous I/O on regular file objects.
It is against the current (02/01/02) CVS version of wine.

I know that async IO on regular files is pretty pointless at the moment,
but it's better to have it working as expected, I guess ...

The patch was successfully tested with a simple test program that checks
the sequence of scheduled reqeuests and file positioning via the
lpOverlapped->Offset and OffsetHigh fields.

server/file.c:
	struct file:		add two async_queue fields (read/write) for async IO.
	create_file_for_fd(): 	Intialize async queues.
	destroy_file(): 	destroy async queues.
	file_poll_event(): 	invoke async requests for overlapped files.
	file_queue_async(): 	implement the queue_async() method.
	file_get_info(): 	return FD_TYPE_OVERLAPPED for overlapped files.

files/file.c:
	FILE_AsyncReadService():
		Use pread() for fd's that support seeking.
	FILE_AsyncWriteService():
		Use pwrite() for fd's that support seeking.

Regards
Martin

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