[issue34663] Support POSIX_SPAWN_USEVFORK flag in posix_spawn

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

I'm discussing with Pablo to see how to use posix_spawn() in the Python subprocess module. IMHO we should consider the specific case of subprocess.

What is the expected API?

kw = {}
if hasattr(os, 'POSIX_SPAWN_USEVFORK'):
   kw['flags'] = os.POSIX_SPAWN_USEVFORK
posix_spawn(*args, **kw)

or

posix_spawn(*args, use_vfork=True)

or

kw = {}
if sys.platform == 'linux':
   kw['use_vfork'] = True
posix_spawn(*args, **kw)

?

For example, if we consider that it's safe to use POSIX_SPAWN_USEVFORK in all cases for posix_spawn(), maybe we should not add an option at the Python level, and hardcode the POSIX_SPAWN_USEVFORK flag in the C code?


--

> if I read the code correctly POSIX_SPAWN_USEVFORK is no longer used in the implementation of posix_spawn(3))

Ok, now I'm confused: what's the point of this issue if the flag became useless? :-)

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34663>
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