fix windows

src/witty/compile_module.py

@@ -1,3 +1,4 @@
+import os
 import Cython
 import fcntl
 import hashlib
@@ -115,8 +116,8 @@ def compile_module(
     module_dir.mkdir(parents=True, exist_ok=True)
 
     # make sure the same module is not build concurrently
-    with open(module_lock, "w") as lock_file:
-        fcntl.lockf(lock_file, fcntl.LOCK_EX)
+    with open(module_lock, "w") as lock_f:
+        lock_file(lock_f)
 
         # already compiled?
         if module_lib.is_file() and not force_rebuild:
@@ -146,3 +147,22 @@ def compile_module(
         build_extension.run()
 
     return load_dynamic(module_name, module_lib)
+
+
+if os.name == "nt":
+    import msvcrt
+
+    def lock_file(file):
+        msvcrt.locking(file.fileno(), msvcrt.LK_LOCK, os.path.getsize(file.name))
+
+    def unlock_file(file):
+        msvcrt.locking(file.fileno(), msvcrt.LK_UNLCK, os.path.getsize(file.name))
+
+else:
+    import fcntl
+
+    def lock_file(file):
+        fcntl.lockf(file, fcntl.LOCK_EX)
+
+    def unlock_file(file):
+        fcntl.lockf(file, fcntl.LOCK_UN)