Re: Adding read_exact and write_all OPs?

[Jens Axboe <axboe@kernel.dk>]

On 8/2/22 3:04 PM, Artyom Pavlov wrote:
> Greetings!
> 
> In application code it's quite common to write/read a whole buffer and
> only then continue task execution. The traditional approach is to wrap
> read/write sycall/OP in loop, which is often done as part of a
> language std. In synchronous context it makes sense because it allows
> to process things like EINTR. But in asynchronous (event-driven)
> context I think it makes a bit less sense.
> 
> What do you think about potential addition of OPs like read_exact and
> write_all, i.e. OPs which on successful CQE guarantee that an input
> buffer was processed completely? They would allow to simplify user
> code and in some cases to significantly reduce ring traffic.

That may make sense, and there's some precedence there for sockets with
the WAITALL flags.

-- 
Jens Axboe