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bpo-33613: multiprocessing semtracker uses sigmask #8500

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bpo-33613: multiprocessing semtracker uses sigmask #8500

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8 changes: 8 additions & 0 deletions Lib/multiprocessing/semaphore_tracker.py
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,8 @@
from . import util

__all__ = ['ensure_running', 'register', 'unregister']
_HAVE_SIGMASK = hasattr(signal, 'pthread_sigmask')
_IGNORED_SIGNALS = (signal.SIGINT, signal.SIGTERM)


class SemaphoreTracker(object):
Expand Down Expand Up @@ -68,7 +70,11 @@ def ensure_running(self):
exe = spawn.get_executable()
args = [exe] + util._args_from_interpreter_flags()
args += ['-c', cmd % r]
if _HAVE_SIGMASK:
signal.pthread_sigmask(signal.SIG_BLOCK, _IGNORED_SIGNALS)
pid = util.spawnv_passfds(exe, args, fds_to_pass)
if _HAVE_SIGMASK:
signal.pthread_sigmask(signal.SIG_UNBLOCK, _IGNORED_SIGNALS)
except:
os.close(w)
raise
Expand Down Expand Up @@ -110,6 +116,8 @@ def main(fd):
# protect the process from ^C and "killall python" etc
signal.signal(signal.SIGINT, signal.SIG_IGN)
signal.signal(signal.SIGTERM, signal.SIG_IGN)
if _HAVE_SIGMASK:
signal.pthread_sigmask(signal.SIG_UNBLOCK, _IGNORED_SIGNALS)

for f in (sys.stdin, sys.stdout):
try:
Expand Down