I don't know about C++, but I do know that when calling Haskell from C code one must initialize the runtime and then exit it once finished. I also know that one must only initialize the runtime once over the course of the program's run. As far as I can tell, this does not occur in your example.
On 08/27/2018 09:44 AM, Ольга Филиппская wrote: > Hello. > > /Summary: /memory is consumed without releasing when a Haskell DLL > (that uses FFI) is loaded and unloaded in an endless loop. > > /Details/: I'm working on a C++ project relying on a DLL that uses > Haskell code. The DLL was built with GHC 8.0.1 x64, OS is Windows 7. > (Newer versions of GHC - 8.2.1 and later - do not allow you to build > such DLLs due to some bugs: ticket #1 > <https://ghc.haskell.org/trac/ghc/ticket/14472#no2>, ticker #2 > <https://ghc.haskell.org/trac/ghc/ticket/14784#no1>). The C++ project > was built with MSVC compiler 2015. > > We noticed that memory is not released when the library is unloaded. > I've constructed a baseline example to reproduce the bug. It has three > files: the first one is *HaskellSources.hs*(see attachments). It > contains one foreign export function foo. This foreign export function > is necessary to reproduce the bug. The second file is *CWrapper.cpp*. > I intentionally didn't include any Haskell function export because > they make no difference for this example. The last file is the code of > the main program (see *main.cpp*) that loads the library and unloads > it at once in an endless loop. > > There are two cases: whether HaskellExports.o is included into the > library or not. > 1. HaskellExports.o is not included into the library (see attached > build script/ build_no_hs.sh/). Everything works just fine (i.e. > amount of memory consumed by the app is the same before DLL loading > and right after unloading.) > 2. HaskellExports.o is included into the library > (see /build_w_hs.sh/). Memory is not released after unloading the DLL, > after repeated load/unload cycles memory consumption keeps growing > until finally the application crashes. > > Is this a known problem? Is it tracked in your bugtracker? (Or maybe > it is not a problem at all and I'm doing it wrong). > > Thank you for your time. > > -- > / > Olga Philippskaya > ./ > > > _______________________________________________ > ghc-devs mailing list > ghc-devs@haskell.org > http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs
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