mirror of
https://gitlab.com/ita1024/waf.git
synced 2024-11-05 10:01:59 +01:00
357 lines
8.3 KiB
Python
357 lines
8.3 KiB
Python
#!/usr/bin/env python
|
|
# encoding: utf-8
|
|
# Thomas Nagy, 2005-2010 (ita)
|
|
|
|
"""
|
|
Runner.py: Task scheduling and execution
|
|
|
|
"""
|
|
|
|
import random, atexit
|
|
try:
|
|
from queue import Queue
|
|
except:
|
|
from Queue import Queue
|
|
from waflib import Utils, Task, Errors, Logs
|
|
|
|
GAP = 10
|
|
"""
|
|
Wait for free tasks if there are at least ``GAP * njobs`` in queue
|
|
"""
|
|
|
|
class TaskConsumer(Utils.threading.Thread):
|
|
"""
|
|
Task consumers belong to a pool of workers
|
|
|
|
They wait for tasks in the queue and then use ``task.process(...)``
|
|
"""
|
|
def __init__(self):
|
|
Utils.threading.Thread.__init__(self)
|
|
self.ready = Queue()
|
|
"""
|
|
Obtain :py:class:`waflib.Task.TaskBase` instances from this queue.
|
|
"""
|
|
self.setDaemon(1)
|
|
self.start()
|
|
|
|
def run(self):
|
|
"""
|
|
Loop over the tasks to execute
|
|
"""
|
|
try:
|
|
self.loop()
|
|
except:
|
|
pass
|
|
|
|
def loop(self):
|
|
"""
|
|
Obtain tasks from :py:attr:`waflib.Runner.TaskConsumer.ready` and call
|
|
:py:meth:`waflib.Task.TaskBase.process`. If the object is a function, execute it.
|
|
"""
|
|
while 1:
|
|
tsk = self.ready.get()
|
|
if not isinstance(tsk, Task.TaskBase):
|
|
tsk(self)
|
|
else:
|
|
tsk.process()
|
|
|
|
pool = Queue()
|
|
"""
|
|
Pool of task consumer objects
|
|
"""
|
|
|
|
def get_pool():
|
|
"""
|
|
Obtain a task consumer from :py:attr:`waflib.Runner.pool`.
|
|
Do not forget to put it back by using :py:func:`waflib.Runner.put_pool`
|
|
and reset properly (original waiting queue).
|
|
|
|
:rtype: :py:class:`waflib.Runner.TaskConsumer`
|
|
"""
|
|
try:
|
|
return pool.get(False)
|
|
except:
|
|
return TaskConsumer()
|
|
|
|
def put_pool(x):
|
|
"""
|
|
Return a task consumer to the thread pool :py:attr:`waflib.Runner.pool`
|
|
|
|
:param x: task consumer object
|
|
:type x: :py:class:`waflib.Runner.TaskConsumer`
|
|
"""
|
|
pool.put(x)
|
|
|
|
def _free_resources():
|
|
global pool
|
|
lst = []
|
|
while pool.qsize():
|
|
lst.append(pool.get())
|
|
for x in lst:
|
|
x.ready.put(None)
|
|
for x in lst:
|
|
x.join()
|
|
pool = None
|
|
atexit.register(_free_resources)
|
|
|
|
class Parallel(object):
|
|
"""
|
|
Schedule the tasks obtained from the build context for execution.
|
|
"""
|
|
def __init__(self, bld, j=2):
|
|
"""
|
|
The initialization requires a build context reference
|
|
for computing the total number of jobs.
|
|
"""
|
|
|
|
self.numjobs = j
|
|
"""
|
|
Number of consumers in the pool
|
|
"""
|
|
|
|
self.bld = bld
|
|
"""
|
|
Instance of :py:class:`waflib.Build.BuildContext`
|
|
"""
|
|
|
|
self.outstanding = []
|
|
"""List of :py:class:`waflib.Task.TaskBase` that may be ready to be executed"""
|
|
|
|
self.frozen = []
|
|
"""List of :py:class:`waflib.Task.TaskBase` that cannot be executed immediately"""
|
|
|
|
self.out = Queue(0)
|
|
"""List of :py:class:`waflib.Task.TaskBase` returned by the task consumers"""
|
|
|
|
self.count = 0
|
|
"""Amount of tasks that may be processed by :py:class:`waflib.Runner.TaskConsumer`"""
|
|
|
|
self.processed = 1
|
|
"""Amount of tasks processed"""
|
|
|
|
self.stop = False
|
|
"""Error flag to stop the build"""
|
|
|
|
self.error = []
|
|
"""Tasks that could not be executed"""
|
|
|
|
self.biter = None
|
|
"""Task iterator which must give groups of parallelizable tasks when calling ``next()``"""
|
|
|
|
self.dirty = False
|
|
"""Flag to indicate that tasks have been executed, and that the build cache must be saved (call :py:meth:`waflib.Build.BuildContext.store`)"""
|
|
|
|
def get_next_task(self):
|
|
"""
|
|
Obtain the next task to execute.
|
|
|
|
:rtype: :py:class:`waflib.Task.TaskBase`
|
|
"""
|
|
if not self.outstanding:
|
|
return None
|
|
return self.outstanding.pop(0)
|
|
|
|
def postpone(self, tsk):
|
|
"""
|
|
A task cannot be executed at this point, put it in the list :py:attr:`waflib.Runner.Parallel.frozen`.
|
|
|
|
:param tsk: task
|
|
:type tsk: :py:class:`waflib.Task.TaskBase`
|
|
"""
|
|
if random.randint(0, 1):
|
|
self.frozen.insert(0, tsk)
|
|
else:
|
|
self.frozen.append(tsk)
|
|
|
|
def refill_task_list(self):
|
|
"""
|
|
Put the next group of tasks to execute in :py:attr:`waflib.Runner.Parallel.outstanding`.
|
|
"""
|
|
while self.count > self.numjobs * GAP:
|
|
self.get_out()
|
|
|
|
while not self.outstanding:
|
|
if self.count:
|
|
self.get_out()
|
|
elif self.frozen:
|
|
try:
|
|
cond = self.deadlock == self.processed
|
|
except:
|
|
pass
|
|
else:
|
|
if cond:
|
|
msg = 'check the build order for the tasks'
|
|
for tsk in self.frozen:
|
|
if not tsk.run_after:
|
|
msg = 'check the methods runnable_status'
|
|
break
|
|
lst = []
|
|
for tsk in self.frozen:
|
|
lst.append('%s\t-> %r' % (repr(tsk), [id(x) for x in tsk.run_after]))
|
|
raise Errors.WafError('Deadlock detected: %s%s' % (msg, ''.join(lst)))
|
|
self.deadlock = self.processed
|
|
|
|
if self.frozen:
|
|
self.outstanding += self.frozen
|
|
self.frozen = []
|
|
elif not self.count:
|
|
self.outstanding.extend(next(self.biter))
|
|
self.total = self.bld.total()
|
|
break
|
|
|
|
def add_more_tasks(self, tsk):
|
|
"""
|
|
Tasks may be added dynamically during the build by binding them to the task :py:attr:`waflib.Task.TaskBase.more_tasks`
|
|
|
|
:param tsk: task
|
|
:type tsk: :py:attr:`waflib.Task.TaskBase`
|
|
"""
|
|
if getattr(tsk, 'more_tasks', None):
|
|
self.outstanding += tsk.more_tasks
|
|
self.total += len(tsk.more_tasks)
|
|
|
|
def get_out(self):
|
|
"""
|
|
Obtain one task returned from the task consumers, and update the task count. Add more tasks if necessary through
|
|
:py:attr:`waflib.Runner.Parallel.add_more_tasks`.
|
|
|
|
:rtype: :py:attr:`waflib.Task.TaskBase`
|
|
"""
|
|
tsk = self.out.get()
|
|
if not self.stop:
|
|
self.add_more_tasks(tsk)
|
|
self.count -= 1
|
|
self.dirty = True
|
|
|
|
def error_handler(self, tsk):
|
|
"""
|
|
Called when a task cannot be executed. The flag :py:attr:`waflib.Runner.Parallel.stop` is set, unless
|
|
the build is executed with::
|
|
|
|
$ waf build -k
|
|
|
|
:param tsk: task
|
|
:type tsk: :py:attr:`waflib.Task.TaskBase`
|
|
"""
|
|
if not self.bld.keep:
|
|
self.stop = True
|
|
self.error.append(tsk)
|
|
|
|
def add_task(self, tsk):
|
|
"""
|
|
Pass a task to a consumer.
|
|
|
|
:param tsk: task
|
|
:type tsk: :py:attr:`waflib.Task.TaskBase`
|
|
"""
|
|
try:
|
|
self.pool
|
|
except AttributeError:
|
|
self.init_task_pool()
|
|
self.ready.put(tsk)
|
|
|
|
def init_task_pool(self):
|
|
# lazy creation, and set a common pool for all task consumers
|
|
pool = self.pool = [get_pool() for i in range(self.numjobs)]
|
|
self.ready = Queue(0)
|
|
def setq(consumer):
|
|
consumer.ready = self.ready
|
|
for x in pool:
|
|
x.ready.put(setq)
|
|
return pool
|
|
|
|
def free_task_pool(self):
|
|
# return the consumers, setting a different queue for each of them
|
|
def setq(consumer):
|
|
consumer.ready = Queue(0)
|
|
self.out.put(self)
|
|
try:
|
|
pool = self.pool
|
|
except:
|
|
pass
|
|
else:
|
|
for x in pool:
|
|
self.ready.put(setq)
|
|
for x in pool:
|
|
self.get_out()
|
|
for x in pool:
|
|
put_pool(x)
|
|
self.pool = []
|
|
|
|
def start(self):
|
|
"""
|
|
Give tasks to :py:class:`waflib.Runner.TaskConsumer` instances until the build finishes or the ``stop`` flag is set.
|
|
If only one job is used, then execute the tasks one by one, without consumers.
|
|
"""
|
|
|
|
self.total = self.bld.total()
|
|
|
|
while not self.stop:
|
|
|
|
self.refill_task_list()
|
|
|
|
# consider the next task
|
|
tsk = self.get_next_task()
|
|
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
|
|
continue
|
|
|
|
if self.stop: # stop immediately after a failure was detected
|
|
break
|
|
|
|
try:
|
|
st = tsk.runnable_status()
|
|
except Exception:
|
|
self.processed += 1
|
|
tsk.err_msg = Utils.ex_stack()
|
|
if not self.stop and self.bld.keep:
|
|
tsk.hasrun = Task.SKIPPED
|
|
if self.bld.keep == 1:
|
|
# if -k stop at the first exception, if -kk try to go as far as possible
|
|
if Logs.verbose > 1 or not self.error:
|
|
self.error.append(tsk)
|
|
self.stop = True
|
|
continue
|
|
tsk.hasrun = Task.EXCEPTION
|
|
self.error_handler(tsk)
|
|
continue
|
|
|
|
if st == Task.ASK_LATER:
|
|
self.postpone(tsk)
|
|
elif st == Task.SKIP_ME:
|
|
self.processed += 1
|
|
tsk.hasrun = Task.SKIPPED
|
|
self.add_more_tasks(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:
|
|
tsk.process()
|
|
else:
|
|
self.add_task(tsk)
|
|
|
|
# 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)
|
|
|
|
# free the task pool, if any
|
|
self.free_task_pool()
|
|
|