Break ReadFile blocking

[Manoj]

How to break ReadFile() blocking?

The Server has created the synchronous pipe (no overlapped I/O) with
blocking enabled and sending data to client.
client is receiving data in seperate thread, now I want to stop
receiving data thread but its block by ReadFile() API and if I use
CloseHandle() it will not return.

CancelSynchronousIo function also return ERROR_INVALID_HANDLE error
code

due to some reason I dont want to use overlapped I/O in CreateFile()/
CreateNamedFile()

any clue for break ReadFile() blocking?

-Manoj

[Todd Aspeotis]

What's wrong with peeking to see if there is data before calling ReadFile?
Then read that number of bytes, no blocking will occur.

http://msdn.microsoft.com/en-us/library/aa365779%28VS.85%29.aspx

hNamedPipe [in]

A handle to the pipe. This parameter can be a handle to a named pipe
instance, as returned by the CreateNamedPipe or CreateFile function, or it
can be a handle to the read end of an anonymous pipe, as returned by the
CreatePipe function. The handle must have GENERIC_READ access to the pipe.

lpTotalBytesAvail [out, optional]

A pointer to a variable that receives the total number of bytes
available to be read from the pipe.

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