fix multithreaded import racing condition when frozen

Main.py

@@ -20,6 +20,7 @@ from Fill import distribute_items_cutoff, distribute_items_staleness, distribute
     balance_multiworld_progression
 from ItemList import generate_itempool, difficulties, fill_prizes
 from Utils import output_path, parse_player_names, get_options, __version__
+import Patch
 
 seeddigits = 20
 
@@ -226,7 +227,6 @@ def main(args, seed=None):
         rompath = output_path(f'{outfilebase}{outfilepname}{outfilesuffix}.sfc')
         rom.write_to_file(rompath)
         if args.create_diff:
-            import Patch
             Patch.create_patch_file(rompath)
         return (player, team, list(rom.name))
 

Patch.py

@@ -10,7 +10,7 @@ import sys
 from typing import Tuple, Optional
 
 import Utils
-from Rom import JAP10HASH, read_rom
+from Rom import JAP10HASH
 
 
 def get_base_rom_path(file_name: str = "") -> str:
@@ -23,6 +23,7 @@ def get_base_rom_path(file_name: str = "") -> str:
 
 
 def get_base_rom_bytes(file_name: str = "") -> bytes:
+    from Rom import read_rom
     base_rom_bytes = getattr(get_base_rom_bytes, "base_rom_bytes", None)
     if not base_rom_bytes:
         file_name = get_base_rom_path(file_name)
@@ -160,3 +161,4 @@ if __name__ == "__main__":
                 import traceback
                 traceback.print_exc()
                 input("Press enter to close.")
+

Rom.py

@@ -1,4 +1,6 @@
-import bisect
+JAP10HASH = '03a63945398191337e896e5771f77173'
+RANDOMIZERBASEHASH = 'a567da86e8bd499256da4bba2209a3fd'
+
 import io
 import json
 import hashlib
@@ -19,10 +21,9 @@ from Text import KingsReturn_texts, Sanctuary_texts, Kakariko_texts, Blacksmiths
 from Utils import output_path, local_path, int16_as_bytes, int32_as_bytes, snes_to_pc
 from Items import ItemFactory
 from EntranceShuffle import door_addresses
+import Patch
 
 
-JAP10HASH = '03a63945398191337e896e5771f77173'
-RANDOMIZERBASEHASH = 'a567da86e8bd499256da4bba2209a3fd'
 
 class LocalRom(object):
 
@@ -65,7 +66,7 @@ class LocalRom(object):
         return expected == buffermd5.hexdigest()
 
     def patch_base_rom(self):
-        from Patch import create_patch_file, create_rom_bytes
+
 
         if os.path.isfile(local_path('basepatch.sfc')):
             with open(local_path('basepatch.sfc'), 'rb') as stream:
@@ -74,11 +75,11 @@ class LocalRom(object):
             if self.verify(buffer):
                 self.buffer = buffer
                 if not os.path.exists(local_path(os.path.join('data', 'basepatch.bmbp'))):
-                    create_patch_file(local_path('basepatch.sfc'))
+                    Patch.create_patch_file(local_path('basepatch.sfc'))
                 return
 
         if os.path.isfile(local_path(os.path.join('data', 'basepatch.bmbp'))):
-            _, target, buffer = create_rom_bytes(local_path(os.path.join('data', 'basepatch.bmbp')))
+            _, target, buffer = Patch.create_rom_bytes(local_path(os.path.join('data', 'basepatch.bmbp')))
             if self.verify(buffer):
                 self.buffer = bytearray(buffer)
                 with open(local_path('basepatch.sfc'), 'wb') as stream:
@@ -105,7 +106,8 @@ class LocalRom(object):
         if self.verify(self.buffer):
             with open(local_path('basepatch.sfc'), 'wb') as stream:
                 stream.write(self.buffer)
-            create_patch_file(local_path('basepatch.sfc'), destination=local_path(os.path.join('data', 'basepatch.bmbp')))
+            Patch.create_patch_file(local_path('basepatch.sfc'),
+                                    destination=local_path(os.path.join('data', 'basepatch.bmbp')))
             os.remove(local_path('data/base2current.json'))
         else:
             raise RuntimeError(