Re: Do I need to use boost::mutex in deadline_timer?

From: Richard Hodges (hodges.r_at_[hidden])
Date: 2020-09-10 06:59:18

Just to clarify - many high performance applications of asio only use one
thread, even for thousands of connections. That’s the point of async IO -
you maximise the throughout of a single thread.

On Thu, 10 Sep 2020 at 02:59, Jupiter via Boost <boost_at_[hidden]>
wrote:

> Thanks Richard and Gavin.
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> You right,  I'll limit the one thread write inside of class, never
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> calling the write outside of class. the single thread wasted too much
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> resources where it is running an intensive MOSI and MISO UART process.
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> I think it is a design issue, if I can design different threads to run
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> different IO spaces, a simple boost::thread should do the job nicely.
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> Thank you very much.
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> jupiter
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> On 9/8/20, Gavin Lambert via Boost <boost_at_[hidden]> wrote:
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> > On 7/09/2020 22:12, Richard Hodges wrote:
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> >> If your implementation is single threaded, you don't need to worry about
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> >> concurrency issues at all. All completion handlers will be scheduled to
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> >> run
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> >> sequentially.
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> >
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> > That's almost true.  The one other place you need to be careful of is
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> > when initiating operations externally (usually writes, since reads are
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> > typically only initiated from completion handlers, but writes can come
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> > from both inside and outside).
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> >
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> > The best thing to do there is to not try to directly issue writes from
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> > "outside", but instead post() the request to start the write to the same
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> > io_context that's managing the socket.
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> >
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> > (The fundamental write operation itself doesn't really care which thread
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> > you start it from, but usually you'll want to manage other state
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> > variables in the class when initiating writes, and those can be
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> > protected by ensuring you only touch them from the io_context thread.)
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> >
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> --
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> "A man can fail many times, but he isn't a failure until he begins to
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> blame somebody else."
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> -- John Burroughs
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>
>
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Richard Hodges
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