init

.venv/lib/python3.8/site-packages/filelock/_windows.py

@@ -0,0 +1,63 @@
+from __future__ import annotations
+
+import os
+import sys
+from errno import ENOENT
+from typing import cast
+
+from ._api import BaseFileLock
+from ._util import raise_on_exist_ro_file
+
+if sys.platform == "win32":  # pragma: win32 cover
+    import msvcrt
+
+    class WindowsFileLock(BaseFileLock):
+        """Uses the :func:`msvcrt.locking` function to hard lock the lock file on windows systems."""
+
+        def _acquire(self) -> None:
+            raise_on_exist_ro_file(self._lock_file)
+            mode = (
+                os.O_RDWR  # open for read and write
+                | os.O_CREAT  # create file if not exists
+                | os.O_TRUNC  # truncate file  if not empty
+            )
+            try:
+                fd = os.open(self._lock_file, mode)
+            except OSError as exception:
+                if exception.errno == ENOENT:  # No such file or directory
+                    raise
+            else:
+                try:
+                    msvcrt.locking(fd, msvcrt.LK_NBLCK, 1)
+                except OSError:
+                    os.close(fd)
+                else:
+                    self._lock_file_fd = fd
+
+        def _release(self) -> None:
+            fd = cast(int, self._lock_file_fd)
+            self._lock_file_fd = None
+            msvcrt.locking(fd, msvcrt.LK_UNLCK, 1)
+            os.close(fd)
+
+            try:
+                os.remove(self._lock_file)
+            # Probably another instance of the application hat acquired the file lock.
+            except OSError:
+                pass
+
+else:  # pragma: win32 no cover
+
+    class WindowsFileLock(BaseFileLock):
+        """Uses the :func:`msvcrt.locking` function to hard lock the lock file on windows systems."""
+
+        def _acquire(self) -> None:
+            raise NotImplementedError
+
+        def _release(self) -> None:
+            raise NotImplementedError
+
+
+__all__ = [
+    "WindowsFileLock",
+]