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#!/usr/bin/env python
# encoding: utf-8
# Thomas Nagy, 2005-2008 (ita)
"Execute the tasks"
import os, sys, random, time, threading, traceback
try: from Queue import Queue
except ImportError: from queue import Queue
import Build, Utils, Logs, Options
from Logs import debug, error
from Constants import *
GAP = 15
run_old = threading.Thread.run
def run(*args, **kwargs):
try:
run_old(*args, **kwargs)
except (KeyboardInterrupt, SystemExit):
raise
except:
sys.excepthook(*sys.exc_info())
threading.Thread.run = run
def process_task(tsk):
m = tsk.master
if m.stop:
m.out.put(tsk)
return
try:
tsk.generator.bld.printout(tsk.display())
if tsk.__class__.stat: ret = tsk.__class__.stat(tsk)
# actual call to task's run() function
else: ret = tsk.call_run()
except Exception, e:
tsk.err_msg = Utils.ex_stack()
tsk.hasrun = EXCEPTION
# TODO cleanup
m.error_handler(tsk)
m.out.put(tsk)
return
if ret:
tsk.err_code = ret
tsk.hasrun = CRASHED
else:
try:
tsk.post_run()
except Utils.WafError:
pass
except Exception:
tsk.err_msg = Utils.ex_stack()
tsk.hasrun = EXCEPTION
else:
tsk.hasrun = SUCCESS
if tsk.hasrun != SUCCESS:
m.error_handler(tsk)
m.out.put(tsk)
class TaskConsumer(threading.Thread):
ready = Queue(0)
consumers = []
def __init__(self):
threading.Thread.__init__(self)
self.setDaemon(1)
self.start()
def run(self):
try:
self.loop()
except:
pass
def loop(self):
while 1:
tsk = TaskConsumer.ready.get()
process_task(tsk)
class Parallel(object):
"""
keep the consumer threads busy, and avoid consuming cpu cycles
when no more tasks can be added (end of the build, etc)
"""
def __init__(self, bld, j=2):
# number of consumers
self.numjobs = j
self.manager = bld.task_manager
self.manager.current_group = 0
self.total = self.manager.total()
# tasks waiting to be processed - IMPORTANT
self.outstanding = []
self.maxjobs = MAXJOBS
# tasks that are awaiting for another task to complete
self.frozen = []
# tasks returned by the consumers
self.out = Queue(0)
self.count = 0 # tasks not in the producer area
self.processed = 1 # progress indicator
self.stop = False # error condition to stop the build
self.error = False # error flag
def get_next(self):
"override this method to schedule the tasks in a particular order"
if not self.outstanding:
return None
return self.outstanding.pop(0)
def postpone(self, tsk):
"override this method to schedule the tasks in a particular order"
# TODO consider using a deque instead
if random.randint(0, 1):
self.frozen.insert(0, tsk)
else:
self.frozen.append(tsk)
def refill_task_list(self):
"called to set the next group of tasks"
while self.count > self.numjobs + GAP or self.count >= self.maxjobs:
self.get_out()
while not self.outstanding:
if self.count:
self.get_out()
if self.frozen:
self.outstanding += self.frozen
self.frozen = []
elif not self.count:
(jobs, tmp) = self.manager.get_next_set()
if jobs != None: self.maxjobs = jobs
if tmp: self.outstanding += tmp
break
def get_out(self):
"the tasks that are put to execute are all collected using get_out"
ret = self.out.get()
self.manager.add_finished(ret)
if not self.stop and getattr(ret, 'more_tasks', None):
self.outstanding += ret.more_tasks
self.total += len(ret.more_tasks)
self.count -= 1
def error_handler(self, tsk):
"by default, errors make the build stop (not thread safe so be careful)"
if not Options.options.keep:
self.stop = True
self.error = True
def start(self):
"execute the tasks"
if TaskConsumer.consumers:
# the worker pool is usually loaded lazily (see below)
# in case it is re-used with a different value of numjobs:
while len(TaskConsumer.consumers) < self.numjobs:
TaskConsumer.consumers.append(TaskConsumer())
while not self.stop:
self.refill_task_list()
# consider the next task
tsk = self.get_next()
if not tsk:
if self.count:
# tasks may add new ones after they are run
continue
else:
# no tasks to run, no tasks running, time to exit
break
if tsk.hasrun:
# if the task is marked as "run", just skip it
self.processed += 1
self.manager.add_finished(tsk)
continue
try:
st = tsk.runnable_status()
except Exception, e:
self.processed += 1
if self.stop and not Options.options.keep:
tsk.hasrun = SKIPPED
self.manager.add_finished(tsk)
continue
self.error_handler(tsk)
self.manager.add_finished(tsk)
tsk.hasrun = EXCEPTION
tsk.err_msg = Utils.ex_stack()
continue
if st == ASK_LATER:
self.postpone(tsk)
elif st == SKIP_ME:
self.processed += 1
tsk.hasrun = SKIPPED
self.manager.add_finished(tsk)
else:
# run me: put the task in ready queue
tsk.position = (self.processed, self.total)
self.count += 1
tsk.master = self
self.processed += 1
if self.numjobs == 1:
process_task(tsk)
else:
TaskConsumer.ready.put(tsk)
# create the consumer threads only if there is something to consume
if not TaskConsumer.consumers:
TaskConsumer.consumers = [TaskConsumer() for i in xrange(self.numjobs)]
# self.count represents the tasks that have been made available to the consumer threads
# collect all the tasks after an error else the message may be incomplete
while self.error and self.count:
self.get_out()
#print loop
assert (self.count == 0 or self.stop)
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