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bitbake: Use a "fork" multiprocessing context

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Python 3.14 changes the default multiprocessing context from "fork" to
"forkserver"; however bitbake heavily relies on "fork" to efficiently
pass data to the child processes. As such, make "fork" context in the bb
namespace and use it in place of the normal multiprocessing module.

Note that multiprocessing contexts were added in Python 3.4, so this
should be safe to use even before Python 3.14

[YOCTO #15858]

(Bitbake rev: 0d9d8d0863e82e986c33c08064ce9a99224a06d5)

Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Steve Sakoman <steve@sakoman.com>
This commit is contained in:
Joshua Watt
2025-08-22 00:40:37 +02:00
committed by Steve Sakoman
parent 5495d8b6ff
commit ec065ce64c
7 changed files with 35 additions and 9 deletions
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bitbake/lib/bb/utils.py
+1 -3
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@@ -12,7 +12,7 @@ import sys
import errno
import logging
import locale
import multiprocessing
from bb import multiprocessing
import importlib
import importlib.machinery
import importlib.util
@@ -1198,8 +1198,6 @@ def process_profilelog(fn, pout = None):
#
def multiprocessingpool(*args, **kwargs):
import multiprocessing.pool
#import multiprocessing.util
#multiprocessing.util.log_to_stderr(10)
# Deal with a multiprocessing bug where signals to the processes would be delayed until the work
# completes. Putting in a timeout means the signals (like SIGINT/SIGTERM) get processed.