Issue #14087: multiprocessing: add Condition.wait_for(). Patch by sbt.
diff --git a/Lib/multiprocessing/synchronize.py b/Lib/multiprocessing/synchronize.py
index e35bbff..532ac5c 100644
--- a/Lib/multiprocessing/synchronize.py
+++ b/Lib/multiprocessing/synchronize.py
@@ -43,6 +43,7 @@
from multiprocessing.process import current_process
from multiprocessing.util import register_after_fork, debug
from multiprocessing.forking import assert_spawning, Popen
+from time import time as _time
# Try to import the mp.synchronize module cleanly, if it fails
# raise ImportError for platforms lacking a working sem_open implementation.
@@ -290,6 +291,24 @@
while self._wait_semaphore.acquire(False):
pass
+ def wait_for(self, predicate, timeout=None):
+ result = predicate()
+ if result:
+ return result
+ if timeout is not None:
+ endtime = _time() + timeout
+ else:
+ endtime = None
+ waittime = None
+ while not result:
+ if endtime is not None:
+ waittime = endtime - _time()
+ if waittime <= 0:
+ break
+ self.wait(waittime)
+ result = predicate()
+ return result
+
#
# Event
#