From 43a22aecd142dd3a0d8ef9d55f564548f2346f4b Mon Sep 17 00:00:00 2001 From: "Gregory P. Smith" <68491+gpshead@users.noreply.github.com> Date: Sun, 23 Nov 2025 01:52:26 -0800 Subject: [PATCH] gh-98552: Revert (unneeded, already done elsewhere) "flush std streams in the multiprocessing forkserver before fork (GH-141849)" (GH-141871) Revert (unneeded, already done elsewhere) "gh-98552: flush std streams in the multiprocessing forkserver before fork (GH-141849)" This reverts commit 58badb1711e12b6e8b5240ab96cdd01b95012de7. (cherry picked from commit 614a28b3da1c898f29c34c14f59bf2d496dbd31d) Co-authored-by: Gregory P. Smith <68491+gpshead@users.noreply.github.com> --- Lib/multiprocessing/forkserver.py | 1 - .../Library/2025-11-22-18-00-38.gh-issue-98552.d5KNy-.rst | 4 ---- 2 files changed, 5 deletions(-) delete mode 100644 Misc/NEWS.d/next/Library/2025-11-22-18-00-38.gh-issue-98552.d5KNy-.rst diff --git a/Lib/multiprocessing/forkserver.py b/Lib/multiprocessing/forkserver.py index 8a4e8d835b0c91..cc8947c5e04fb1 100644 --- a/Lib/multiprocessing/forkserver.py +++ b/Lib/multiprocessing/forkserver.py @@ -326,7 +326,6 @@ def sigchld_handler(*_unused): len(fds))) child_r, child_w, *fds = fds s.close() - util._flush_std_streams() pid = os.fork() if pid == 0: # Child diff --git a/Misc/NEWS.d/next/Library/2025-11-22-18-00-38.gh-issue-98552.d5KNy-.rst b/Misc/NEWS.d/next/Library/2025-11-22-18-00-38.gh-issue-98552.d5KNy-.rst deleted file mode 100644 index 37a71ac1fff3f3..00000000000000 --- a/Misc/NEWS.d/next/Library/2025-11-22-18-00-38.gh-issue-98552.d5KNy-.rst +++ /dev/null @@ -1,4 +0,0 @@ -The :mod:`multiprocessing` forkserver process now flushes stdout and stderr -before it forks to avoid the confusion children inheriting any buffered but -not yet written output data. Normally there is none, but when using -:func:`multiprocessing.set_forkserver_preload` there *could* be.