Add thread enter/exit callbacks

godot/core/godotcore.nim

@@ -285,6 +285,10 @@ proc print*(message: string) {.inline.} =
   let s = message.toGodotString()
   godotPrint(s)
 
+proc print*(message: cstring) {.inline.} =
+  let s = message.toGodotString()
+  godotPrint(s)
+
 template printWarning*(warn: typed) =
   let (filename, line) = instantiationInfo()
   godotPrintWarning(cstring($warn), nil, cstring(filename), line.cint)

godot/core/strings.nim

@@ -56,3 +56,7 @@ proc `$`*(self: GodotString): string =
 proc toGodotString*(s: string): GodotString {.inline.} =
   ## Converts the Nim string into ``GodotString``
   initGodotString(result, unsafeAddr s[0], cint(s.len + 1))
+
+proc toGodotString*(s: cstring): GodotString {.inline.} =
+  ## Converts the cstring into ``GodotString``
+  initGodotString(result, s, cint(s.len + 1))

godot/nim/godotnim.nim

@@ -554,4 +554,16 @@ proc godot_gdnative_init(options: ptr GodotNativeInitOptions) {.
 
 proc godot_gdnative_terminate(options: ptr GodotNativeTerminateOptions) {.
     cdecl, exportc, dynlib.} =
-  deallocHeap()
+  deallocHeap(runFinalizers = true, allowGcAfterwards = false)
+
+proc godot_nativescript_thread_enter() {.
+    cdecl, exportc, dynlib.} =
+  when compileOption("threads"):
+    setupForeignThreadGc()
+  else:
+    print(cstring"A foreign thread is created, but app is compiled without --threads:on. Bad things will happen if Nim code is invoked from this thread.")
+
+proc godot_nativescript_thread_exit() {.
+    cdecl, exportc, dynlib.} =
+  when compileOption("threads"):
+    teardownForeignThreadGc()