pythongh-118293: Suppress mouse cursor change in multiprocessing

tunedal · Apr 26, 2024 · bcde233 · bcde233
1 parent d7b9194
commit bcde233
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Showing 2 changed files with 5 additions and 1 deletion.
diff --git a/Lib/multiprocessing/popen_spawn_win32.py b/Lib/multiprocessing/popen_spawn_win32.py
@@ -3,6 +3,7 @@
 import signal
 import sys
 import _winapi
+from subprocess import STARTUPINFO
 
 from .context import reduction, get_spawning_popen, set_spawning_popen
 from . import spawn
@@ -74,7 +75,8 @@ def __init__(self, process_obj):
             try:
                 hp, ht, pid, tid = _winapi.CreateProcess(
                     python_exe, cmd,
-                    None, None, False, 0, env, None, None)
+                    None, None, False, 0, env, None,
+                    STARTUPINFO(dwFlags=_winapi.STARTF_FORCEOFFFEEDBACK))
                 _winapi.CloseHandle(ht)
             except:
                 _winapi.CloseHandle(rhandle)

diff --git a/Misc/NEWS.d/next/Windows/2024-04-26-14-23-07.gh-issue-118293.ohhPtW.rst b/Misc/NEWS.d/next/Windows/2024-04-26-14-23-07.gh-issue-118293.ohhPtW.rst
@@ -0,0 +1,2 @@
+The `multiprocessing` module now passes the `STARTF_FORCEOFFFEEDBACK` flag
+when spawning processes to tell Windows not to change the mouse cursor.