def _pool(self, currentLimit, threadFactory):
"""
Override testing hook to create a deterministic threadpool.
@param currentLimit: A 1-argument callable which returns the current
threadpool size limit.
@param threadFactory: ignored in this invocation; a 0-argument callable
that would produce a thread.
@return: a L{Team} backed by the coordinator and worker passed to
L{MemoryPool.__init__}.
"""
def respectLimit():
# The expression in this method copied and pasted from
# twisted.threads._pool, which is unfortunately bound up
# with lots of actual-threading stuff.
stats = team.statistics()
if ((stats.busyWorkerCount + stats.idleWorkerCount) >=
currentLimit()):
return None
return self._newWorker()
team = Team(coordinator=self._coordinator,
createWorker=respectLimit,
logException=self._failTest)
return team
def deterministicPool():
"""
Create a deterministic threadpool.
@return: 2-tuple of L{ThreadPool}, 0-argument C{work} callable; when
C{work} is called, do the work.
"""
worker, doer = createMemoryWorker()
return (DeterministicThreadPool(
Team(LockWorker(Lock(), local()), (lambda: worker),
lambda: None)), doer)