Re: realloc() - frequency, conditions, or experiences about relocation?

On 6/17/2024 9:58 AM, Scott Lurndal wrote:

Malcolm McLean <malcolm.arthur.mclean@gmail.com> writes:

On 17/06/2024 10:55, Ben Bacarisse wrote:

Malcolm McLean <malcolm.arthur.mclean@gmail.com> writes:
>

 

>
I have no idea what you are talking about.  What "value" are you looking
to calculate?
>

We have a continuously growing buffer,

 At this point, you should be asking yourself
if there are better alternatives for storing
the incoming data than to a continuously growing
dynamically allocated piecemeal  buffer.
 C character stdio tends to work well for streaming applications
(i.e. pipelines where the input is (minimally) processed and forwarded
to the output), but not so efficiently for applications that need to
look at the data en masse.

Indeed.

Personnally, I'd mmap the input file and eschew stdio completely
and just walk through memory with the appropriate pointer.

That works for sure. Actually, its been a while since I have used memory mapped files. I made a little database thing with them that multiple processes could use, lock-free... ;^)
Also, I remember a nifty trick to use memory mapped files with certain lock-free algorithms. I need to find that old post over on comp.programming.threads. Have a feeling that its going to be hard to find!

(mmap showed up in the late 80s, so you can pretend it
is C90 if you like).