I'm trying to figure out why the gc (refc) is crashing. I have a dll with nim
code, that's being called from C++. The nim function is calling NimMain() once
and then doing some stuff with paths (allocating strings) and eventually
crashes from repeated calls. If I move the NimMain() call outside of the once
macro so it's called repeatedly, there's no crash. I don't know if that's a bad
thing to repeatedly call NimMain, but I'd like to initialize the dll once. I've
tried calling setupForeignThreadGC after NimMain or alone at the top of the
function, but that doesn't make a difference.
If I compile with orc, I don't have any crashes which is great, but currently,
I'm having issues with compiling with orc and clang on osx.
Any idea how I can stop refc from crashing without calling NimMain in my
function?
proc NimMain() {.importc.} # needed to initialize the gc
var libPath:string
{.pragma: ex, exportc, cdecl, dynlib.}
proc initializeHost() {.ex.} =
NimMain()
libPath = getNimForUEConfig(pluginDir).nimForUELibPath
# call in an Actor while game is running
proc checkReload*() {.ex.} =
# NimMain() # no crash
#crashes on repeated calls
once:
initializeHost()
dostuff()
Run
On the cpp side, Initialize is called first, then Tick is called repeatedly.
void UNimForUEEngineSubsystem::Initialize(FSubsystemCollectionBase&
Collection)
{
initializeHost();
checkReload();
elapsedSeconds = 0.0;
}
void UNimForUEEngineSubsystem::Tick(float DeltaTime)
{
elapsedSeconds += DeltaTime;
if (elapsedSeconds > 0.1) // trigger crash faster
{
checkReload();
elapsedSeconds = 0.0;
}
}
Run
