Re: [Boost-users] Efficiently pass data from thread to main

Subject: Re: [Boost-users] Efficiently pass data from thread to main
From: DK (dckorah+boost-users_at_[hidden])
Date: 2015-05-04 23:13:08

Many ways to do it; simply put, the thread need to be able to put the data
into a buffer that the main thread can read from, in a thread safe manner.
My preferred way of doing this is using a producer-consumer pattern;
basically a queue with many producers and one consumer.
You may want to look at Boost.LockFree; especially the example
http://www.boost.org/doc/libs/1_57_0/doc/html/lockfree/examples.html

The global data buffer is nice too; make sure you use a thread safe buffer
( or data structure ).
http://www.boost.org/doc/libs/1_53_0/libs/circular_buffer/doc/circular_buffer.html
(make sure you read #threadsafety
<http://www.boost.org/doc/libs/1_53_0/libs/circular_buffer/doc/circular_buffer.html#threadsafety>
)

Good luck

On 5 May 2015 at 00:09, Lane <software.research.development_at_[hidden]>
wrote:

> Using boost, I start a thread from the main process as such.
>
>     MyWorkThread newThread;
>     newThread = boost::thread(newThread);
>
> And in the worker thread class (MyWorkThread), I have a read function
> which reads from a USB device as much data as it can deliver. This function
> can be called several hundred times a second.
>
>     MyThread::read() }
>         //...
>         while () {
>             MyData data;
>
>             if (hasMore(dev, &data))
>                 // lots of data here
>                 // need to get it back to the main thread
>             }
>         }
>     }
>
> I'm trying to figure out how to efficiently get this data back to the main
> process to be placed in a buffer since it can be called so often.
>
> - Would making a callback to the main process be the way to go? If so, any
> pointers how using boost?
> - Or should I just have a global data buffer and store it directly?
>
>
>
>
>
>
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