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Subject: Re: Are We Back to the "Wars" Now ?
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On 12/17/24 8:23 PM, Lawrence D'Oliveiro wrote:
> On Tue, 17 Dec 2024 13:34:30 +0000, Geoff Clare wrote:
> 
>> With a pipe or FIFO, you just use simple read and write operations and
>> the system handles all the messy stuff for you. If the pipe reaches
>> capacity, write blocks until there is room to write some more; if the
>> pipe becomes empty, read blocks until there is more data available; when
>> read returns EOF that's the end of the data.
> 
> Yup. Furthermore:
> 
> * When the last writer closes its end, any remaining read attempts get
> EOF.
> * When the last reader closes its end, any remaining write attempts get
> “broken pipe”.

   But you're still limited to the amount of RAM the
   system can access.

   These days that's probably a LOT - but might NOT be,
   esp for 'embedded' type boards like the older PIs,
   BBBs and such. Never assume the user has essentially
   infinite RAM.

   For such platforms you may need to sacrifice speed
   and some convenience and instead put such data on a
   mass-storage device. Not THAT hard to do - but
   remember to use locks.

   Know your target audience - yet TRY to accommodate all.

   I'll still rec making interprocess comms relatively
   terse and handle 'big data' in some other manner
   (as extensively covered in this thread). An 8k raw
   frame grab is about 146mb - and let's not even speak
   of 8k video segments.