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| import logging
logging.basicConfig(level=logging.INFO)
log = logging.getLogger('test')
import time
from threading import Thread, Event, Lock
# WorkQ defines an interface.
class WorkQ(list):
def pop(self):
if self:
return super().pop(0)
def push(self, target, args=(), kwargs={}):
super().append( (target, args, kwargs) )
@property
def size(self):
return len(self)
IDLE, RUN, PAUSED, SHUT = 'idle', 'run', 'paused', 'shut'
CPU_STATES = IDLE, RUN, PAUSED, SHUT
class Processor(Thread):
number = 0
def get_number(self):
Processor.number += 1
return Processor.number
def __init__(self, workq):
self.number = self.get_number()
self.workq = workq
super().__init__()
self._run = Event()
self._shut = Event()
self.state = IDLE
log.debug('created %s' % self)
def _do_work(self):
w = self.workq.pop()
if w:
target, args, kwds = w
log.debug('CPU %d starting "%s(%s)"' % (self.number,
target.__name__, ', '.join(str(x) for x in args)))
try:
results = target(*args, **kwds)
except Exception() as e:
log.exception('error on "%s"' % target.__name__)
else:
self.shut()
def run(self):
self.state = RUN
log.debug('%s' % self)
while not self._shut.is_set():
if self._run.is_set():
self.state = PAUSED
log.debug('%s' % self)
while self._run.is_set():
self._run.wait(timeout=0.5)
log.debug('%s' % self)
self.state = RUN
else:
self._do_work()
self.state = SHUT
log.debug('%s' % self)
def pause(self, wait=False):
log.debug('CPU %d - pausing ' % (self.number))
if not self._run.is_set():
self._run.set()
if wait:
log.debug('.pause waiting %s' % self)
self.wait(PAUSED)
def resume(self):
log.debug('CPU %d - resuming' % (self.number))
if self._run.is_set():
self._run.clear()
def shut(self, wait=False):
log.debug('CPU %d - shutting down' % (self.number))
if not self._shut.is_set():
self._shut.set()
if self.state is PAUSED:
self.resume()
if wait:
log.debug('.shut waiting %s' % self)
self.wait(SHUT)
def wait(self, state):
assert state in CPU_STATES
while self.state not in (state, SHUT):
log.debug('wait cpu %s for %s' % (state, self))
time.sleep(0.5)
def __str__(self):
return 'CPU %d - state: %s' % (self.number, self.state)
if __name__ == '__main__':
import pickle # to serialize suites...
# mock test case as "callables"
def test_case(name, counter):
while counter > 0:
print ('%s: counter= %d' % (name, counter))
counter -= 1
time.sleep(0.2)
# mock test suite as WorkQ"
class TestSuite(WorkQ):
def __init__(self, name):
super().__init__()
self.name = name
def __str__(self):
return 'TestSuite(%s), left: %d' % (self.name, self.size)
# build two test suite
suites = [ TestSuite('suite-%d' % x) for x in range(2) ]
for s in suites:
for _ in range(3):
s.push(test_case, ('%s, case: %d' % (s.name, _), 5))
log.info('creating processors')
cpu = [ Processor(w) for w in suites ]
for _ in cpu: _.start()
# our victim
p = cpu[0]
log.info('pausing cpu 0')
p.pause(wait=True)
# fetch workq
wq = p.workq
log.info('dumping state: %s' % wq.name)
wq_state = pickle.dumps(wq)
log.info('shutting down CPU %d' % p.number)
p.shut(wait=True)
cpu.remove(p)
log.info('pausing %s' % wq.name)
count = 100 # show that other tasks are
delay = 2.0 / count # running while we're pausing.
while count > 0:
time.sleep(delay)
count -= 1
log.info('reloading state')
wq = pickle.loads(wq_state)
log.info('reloaded state: %s' % wq.name)
log.info('creating new CPU/thread')
p = Processor(wq)
cpu.append(p)
p.start()
log.info('restarting...')
p.wait(RUN)
log.info('waiting completion')
for _ in cpu: _.join() |
