synchronous bulk transfer.

[Norman Feske]

Hello Mohammad,

On 10.09.2015 16:01, Mohammad Hamad wrote:
> I am trying to send big buffer  using RPC call. to do that I used to
> divide the buffer and send it many time .  I read about the synchronous
> bulk transfer, by using shared memory with the synchronous RPC. are
> there any samples about using this method.

I recommend to look at the timer-session RPC interface (Section "4.5.3.
Terminal and UART" of the documentation [1]) as a reference:


https://github.com/genodelabs/genode/tree/master/repos/os/include/terminal_session

Please note the difference between the declaration of the read/write
functions and the RPC_FUNCTION declarations of 'Rpc_read' and
'Rpc_write'. The read/write functions are plain virtual functions
implemented in 'client.c'. Those functions take a size and a pointer to
a buffer as arguments. They copy the payload from/to the shared memory
buffer and issue the RPC calls. The Rpc_read/Rpc_write definitions
merely contain the size argument but no buffer pointer. Whereas the
payload is transferred via the shared-memory buffer, the size is
transmitted as an RPC-function argument.

For more examples, you may also have a look at the input session and the
report session.

[1] http://genode.org/documentation/genode-foundations-15-05.pdf

Cheers
Norman

-- 
Dr.-Ing. Norman Feske
Genode Labs

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