Synapse and ShareMem ...not?!?
lazarus / 38-Networking and Web Programming

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cdbc · 2025-07-10 09:36

Hi
I'm doing a little TFTP-stuff, at the moment and I've run into a wee
problem:
When using the the library-memory-manager(libfpcmm.so) & ShareMem, the
synapse part struggles and is unstable  ...works fine until suddenly
it just stops and whines about getting memory for a string, deep
inside synapse?!?
Here's the deal, I'm using plugins and therefore need to use
'sharemem', but when I don't use it and use the 'built-in' memmgr, the
app runs just fine and stable -- even with big files --  That to me is
a huge conundrum...
I've tried compiling both lib & app with 'cmem', but that's even
worse.
Everything is written and compiled in trunk/trunk.
Any tips or advice will be deeply appreciated 
Regards Benny

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Thaddy · 2025-07-10 09:54

I would use a, ahum, comobject. I will post an example within an hour
or so.
It will look a bit involved but it really isn't. I am used to use com
for plugins.
(Of course that is Windows only if that would suffice?)
COM marshaling is done through the OS. No memory worries.

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cdbc · 2025-07-10 10:19

Hi Thaddy
No worries mate, I'm also using comobjects in my plugins, the
framework is "type-agnostic". I'm looking forward to your example 
I'm /stuped/ over -what shouldn't work, works- 
Any news on the major overhaul of the memory-manager in fpc? As I
understand it, that should undergo this summer...
...and do you by any chance know the state of today's fpc-trunk, maybe
I should "git pull" & "make"?!?
Regards Benny

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Thaddy · 2025-07-10 10:31

There has been extensive work regarding the heap manager, no interface
changes but faster in average cases and less fragmentation.
Btw: I just found a bug in activex, so need to fix that first.
(CLASSID doesn't map correctly)
General point is, though, that a dll with a comobject does not need
sharemem at all.

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Thaddy · 2025-07-10 11:02

provided you use COM supprted types like WideChar and WideString:
these are also COM marshaled.