[fpc-devel] simpleipc issues

Ondrej Pokorny lazarus at kluug.net
Tue Sep 15 13:33:04 CEST 2015

On 15.09.2015 13:22, Michael Schnell wrote:
> On 09/15/2015 01:09 PM, Michael Van Canneyt wrote:
>> IPC = Inter PROCESS Communication.
> I know that you know this, but Ondrej is talking about cthreads in one 
> of his message, so I tried to politely set a trigger.
> -Michael

This is because Michael Van Canneyt pointed me to "man sem_overview". 
The first Google search pointed me to 
http://linux.die.net/man/7/sem_overview  where I found the "Named 
semaphores" with functions sem_open,  sem_close etc. with the 
description that they can be used across processes. A quick search in 
FPC sources pointed me again to the cthreads unit.
I haven't done any Linux development with semaphores, so sorry if I am 
completely wrong here. I will also welcome if you correct me.

BUT semaphores are not directly needed by the IPC. simpleipc doesn't use 
them either.

It would be nice to have solved the issue with double file locks on 
unix, but this is not the core problem.


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