import sys assert sys.platform == "win32" from ctypes import pointer from ..utils import SPHINX_AUTODOC_RUNNING # Do not import win32-specific stuff when generating documentation. # Otherwise RTD would be unable to generate docs for this module. if not SPHINX_AUTODOC_RUNNING: from ctypes import windll from ctypes.wintypes import BOOL, DWORD, HANDLE from typing import List, Optional from prompt_toolkit.win32_types import SECURITY_ATTRIBUTES __all__ = ["wait_for_handles", "create_win32_event"] WAIT_TIMEOUT = 0x00000102 INFINITE = -1 def wait_for_handles( handles: List[HANDLE], timeout: int = INFINITE ) -> Optional[HANDLE]: """ Waits for multiple handles. (Similar to 'select') Returns the handle which is ready. Returns `None` on timeout. http://msdn.microsoft.com/en-us/library/windows/desktop/ms687025(v=vs.85).aspx Note that handles should be a list of `HANDLE` objects, not integers. See this comment in the patch by @quark-zju for the reason why: ''' Make sure HANDLE on Windows has a correct size Previously, the type of various HANDLEs are native Python integer types. The ctypes library will treat them as 4-byte integer when used in function arguments. On 64-bit Windows, HANDLE is 8-byte and usually a small integer. Depending on whether the extra 4 bytes are zero-ed out or not, things can happen to work, or break. ''' This function returns either `None` or one of the given `HANDLE` objects. (The return value can be tested with the `is` operator.) """ arrtype = HANDLE * len(handles) handle_array = arrtype(*handles) ret: int = windll.kernel32.WaitForMultipleObjects( len(handle_array), handle_array, BOOL(False), DWORD(timeout) ) if ret == WAIT_TIMEOUT: return None else: return handles[ret] def create_win32_event() -> HANDLE: """ Creates a Win32 unnamed Event . http://msdn.microsoft.com/en-us/library/windows/desktop/ms682396(v=vs.85).aspx """ return HANDLE( windll.kernel32.CreateEventA( pointer(SECURITY_ATTRIBUTES()), BOOL(True), # Manual reset event. BOOL(False), # Initial state. None, # Unnamed event object. ) )