You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
618 lines
16 KiB
Python
618 lines
16 KiB
Python
#!/usr/bin/env python
|
|
# encoding: utf-8
|
|
# Thomas Nagy, 2005-2018 (ita)
|
|
|
|
"""
|
|
Runner.py: Task scheduling and execution
|
|
"""
|
|
|
|
import heapq, traceback
|
|
try:
|
|
from queue import Queue, PriorityQueue
|
|
except ImportError:
|
|
from Queue import Queue
|
|
try:
|
|
from Queue import PriorityQueue
|
|
except ImportError:
|
|
class PriorityQueue(Queue):
|
|
def _init(self, maxsize):
|
|
self.maxsize = maxsize
|
|
self.queue = []
|
|
def _put(self, item):
|
|
heapq.heappush(self.queue, item)
|
|
def _get(self):
|
|
return heapq.heappop(self.queue)
|
|
|
|
from waflib import Utils, Task, Errors, Logs
|
|
|
|
GAP = 5
|
|
"""
|
|
Wait for at least ``GAP * njobs`` before trying to enqueue more tasks to run
|
|
"""
|
|
|
|
class PriorityTasks(object):
|
|
def __init__(self):
|
|
self.lst = []
|
|
def __len__(self):
|
|
return len(self.lst)
|
|
def __iter__(self):
|
|
return iter(self.lst)
|
|
def __str__(self):
|
|
return 'PriorityTasks: [%s]' % '\n '.join(str(x) for x in self.lst)
|
|
def clear(self):
|
|
self.lst = []
|
|
def append(self, task):
|
|
heapq.heappush(self.lst, task)
|
|
def appendleft(self, task):
|
|
"Deprecated, do not use"
|
|
heapq.heappush(self.lst, task)
|
|
def pop(self):
|
|
return heapq.heappop(self.lst)
|
|
def extend(self, lst):
|
|
if self.lst:
|
|
for x in lst:
|
|
self.append(x)
|
|
else:
|
|
if isinstance(lst, list):
|
|
self.lst = lst
|
|
heapq.heapify(lst)
|
|
else:
|
|
self.lst = lst.lst
|
|
|
|
class Consumer(Utils.threading.Thread):
|
|
"""
|
|
Daemon thread object that executes a task. It shares a semaphore with
|
|
the coordinator :py:class:`waflib.Runner.Spawner`. There is one
|
|
instance per task to consume.
|
|
"""
|
|
def __init__(self, spawner, task):
|
|
Utils.threading.Thread.__init__(self)
|
|
self.task = task
|
|
"""Task to execute"""
|
|
self.spawner = spawner
|
|
"""Coordinator object"""
|
|
self.setDaemon(1)
|
|
self.start()
|
|
def run(self):
|
|
"""
|
|
Processes a single task
|
|
"""
|
|
try:
|
|
if not self.spawner.master.stop:
|
|
self.spawner.master.process_task(self.task)
|
|
finally:
|
|
self.spawner.sem.release()
|
|
self.spawner.master.out.put(self.task)
|
|
self.task = None
|
|
self.spawner = None
|
|
|
|
class Spawner(Utils.threading.Thread):
|
|
"""
|
|
Daemon thread that consumes tasks from :py:class:`waflib.Runner.Parallel` producer and
|
|
spawns a consuming thread :py:class:`waflib.Runner.Consumer` for each
|
|
:py:class:`waflib.Task.Task` instance.
|
|
"""
|
|
def __init__(self, master):
|
|
Utils.threading.Thread.__init__(self)
|
|
self.master = master
|
|
""":py:class:`waflib.Runner.Parallel` producer instance"""
|
|
self.sem = Utils.threading.Semaphore(master.numjobs)
|
|
"""Bounded semaphore that prevents spawning more than *n* concurrent consumers"""
|
|
self.setDaemon(1)
|
|
self.start()
|
|
def run(self):
|
|
"""
|
|
Spawns new consumers to execute tasks by delegating to :py:meth:`waflib.Runner.Spawner.loop`
|
|
"""
|
|
try:
|
|
self.loop()
|
|
except Exception:
|
|
# Python 2 prints unnecessary messages when shutting down
|
|
# we also want to stop the thread properly
|
|
pass
|
|
def loop(self):
|
|
"""
|
|
Consumes task objects from the producer; ends when the producer has no more
|
|
task to provide.
|
|
"""
|
|
master = self.master
|
|
while 1:
|
|
task = master.ready.get()
|
|
self.sem.acquire()
|
|
if not master.stop:
|
|
task.log_display(task.generator.bld)
|
|
Consumer(self, task)
|
|
|
|
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
|
|
"""
|
|
Amount of parallel consumers to use
|
|
"""
|
|
|
|
self.bld = bld
|
|
"""
|
|
Instance of :py:class:`waflib.Build.BuildContext`
|
|
"""
|
|
|
|
self.outstanding = PriorityTasks()
|
|
"""Heap of :py:class:`waflib.Task.Task` that may be ready to be executed"""
|
|
|
|
self.postponed = PriorityTasks()
|
|
"""Heap of :py:class:`waflib.Task.Task` which are not ready to run for non-DAG reasons"""
|
|
|
|
self.incomplete = set()
|
|
"""List of :py:class:`waflib.Task.Task` waiting for dependent tasks to complete (DAG)"""
|
|
|
|
self.ready = PriorityQueue(0)
|
|
"""List of :py:class:`waflib.Task.Task` ready to be executed by consumers"""
|
|
|
|
self.out = Queue(0)
|
|
"""List of :py:class:`waflib.Task.Task` returned by the task consumers"""
|
|
|
|
self.count = 0
|
|
"""Amount of tasks that may be processed by :py:class:`waflib.Runner.TaskConsumer`"""
|
|
|
|
self.processed = 0
|
|
"""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 that indicates that the build cache must be saved when a task was executed
|
|
(calls :py:meth:`waflib.Build.BuildContext.store`)"""
|
|
|
|
self.revdeps = Utils.defaultdict(set)
|
|
"""
|
|
The reverse dependency graph of dependencies obtained from Task.run_after
|
|
"""
|
|
|
|
self.spawner = None
|
|
"""
|
|
Coordinating daemon thread that spawns thread consumers
|
|
"""
|
|
if self.numjobs > 1:
|
|
self.spawner = Spawner(self)
|
|
|
|
def get_next_task(self):
|
|
"""
|
|
Obtains the next Task instance to run
|
|
|
|
:rtype: :py:class:`waflib.Task.Task`
|
|
"""
|
|
if not self.outstanding:
|
|
return None
|
|
return self.outstanding.pop()
|
|
|
|
def postpone(self, tsk):
|
|
"""
|
|
Adds the task to the list :py:attr:`waflib.Runner.Parallel.postponed`.
|
|
The order is scrambled so as to consume as many tasks in parallel as possible.
|
|
|
|
:param tsk: task instance
|
|
:type tsk: :py:class:`waflib.Task.Task`
|
|
"""
|
|
self.postponed.append(tsk)
|
|
|
|
def refill_task_list(self):
|
|
"""
|
|
Pulls a next group of tasks to execute in :py:attr:`waflib.Runner.Parallel.outstanding`.
|
|
Ensures that all tasks in the current build group are complete before processing the next one.
|
|
"""
|
|
while self.count > self.numjobs * GAP:
|
|
self.get_out()
|
|
|
|
while not self.outstanding:
|
|
if self.count:
|
|
self.get_out()
|
|
if self.outstanding:
|
|
break
|
|
elif self.postponed:
|
|
try:
|
|
cond = self.deadlock == self.processed
|
|
except AttributeError:
|
|
pass
|
|
else:
|
|
if cond:
|
|
# The most common reason is conflicting build order declaration
|
|
# for example: "X run_after Y" and "Y run_after X"
|
|
# Another can be changing "run_after" dependencies while the build is running
|
|
# for example: updating "tsk.run_after" in the "runnable_status" method
|
|
lst = []
|
|
for tsk in self.postponed:
|
|
deps = [id(x) for x in tsk.run_after if not x.hasrun]
|
|
lst.append('%s\t-> %r' % (repr(tsk), deps))
|
|
if not deps:
|
|
lst.append('\n task %r dependencies are done, check its *runnable_status*?' % id(tsk))
|
|
raise Errors.WafError('Deadlock detected: check the task build order%s' % ''.join(lst))
|
|
self.deadlock = self.processed
|
|
|
|
if self.postponed:
|
|
self.outstanding.extend(self.postponed)
|
|
self.postponed.clear()
|
|
elif not self.count:
|
|
if self.incomplete:
|
|
for x in self.incomplete:
|
|
for k in x.run_after:
|
|
if not k.hasrun:
|
|
break
|
|
else:
|
|
# dependency added after the build started without updating revdeps
|
|
self.incomplete.remove(x)
|
|
self.outstanding.append(x)
|
|
break
|
|
else:
|
|
if self.stop or self.error:
|
|
break
|
|
raise Errors.WafError('Broken revdeps detected on %r' % self.incomplete)
|
|
else:
|
|
tasks = next(self.biter)
|
|
ready, waiting = self.prio_and_split(tasks)
|
|
self.outstanding.extend(ready)
|
|
self.incomplete.update(waiting)
|
|
self.total = self.bld.total()
|
|
break
|
|
|
|
def add_more_tasks(self, tsk):
|
|
"""
|
|
If a task provides :py:attr:`waflib.Task.Task.more_tasks`, then the tasks contained
|
|
in that list are added to the current build and will be processed before the next build group.
|
|
|
|
The priorities for dependent tasks are not re-calculated globally
|
|
|
|
:param tsk: task instance
|
|
:type tsk: :py:attr:`waflib.Task.Task`
|
|
"""
|
|
if getattr(tsk, 'more_tasks', None):
|
|
more = set(tsk.more_tasks)
|
|
groups_done = set()
|
|
def iteri(a, b):
|
|
for x in a:
|
|
yield x
|
|
for x in b:
|
|
yield x
|
|
|
|
# Update the dependency tree
|
|
# this assumes that task.run_after values were updated
|
|
for x in iteri(self.outstanding, self.incomplete):
|
|
for k in x.run_after:
|
|
if isinstance(k, Task.TaskGroup):
|
|
if k not in groups_done:
|
|
groups_done.add(k)
|
|
for j in k.prev & more:
|
|
self.revdeps[j].add(k)
|
|
elif k in more:
|
|
self.revdeps[k].add(x)
|
|
|
|
ready, waiting = self.prio_and_split(tsk.more_tasks)
|
|
self.outstanding.extend(ready)
|
|
self.incomplete.update(waiting)
|
|
self.total += len(tsk.more_tasks)
|
|
|
|
def mark_finished(self, tsk):
|
|
def try_unfreeze(x):
|
|
# DAG ancestors are likely to be in the incomplete set
|
|
# This assumes that the run_after contents have not changed
|
|
# after the build starts, else a deadlock may occur
|
|
if x in self.incomplete:
|
|
# TODO remove dependencies to free some memory?
|
|
# x.run_after.remove(tsk)
|
|
for k in x.run_after:
|
|
if not k.hasrun:
|
|
break
|
|
else:
|
|
self.incomplete.remove(x)
|
|
self.outstanding.append(x)
|
|
|
|
if tsk in self.revdeps:
|
|
for x in self.revdeps[tsk]:
|
|
if isinstance(x, Task.TaskGroup):
|
|
x.prev.remove(tsk)
|
|
if not x.prev:
|
|
for k in x.next:
|
|
# TODO necessary optimization?
|
|
k.run_after.remove(x)
|
|
try_unfreeze(k)
|
|
# TODO necessary optimization?
|
|
x.next = []
|
|
else:
|
|
try_unfreeze(x)
|
|
del self.revdeps[tsk]
|
|
|
|
if hasattr(tsk, 'semaphore'):
|
|
sem = tsk.semaphore
|
|
sem.release(tsk)
|
|
while sem.waiting and not sem.is_locked():
|
|
# take a frozen task, make it ready to run
|
|
x = sem.waiting.pop()
|
|
self._add_task(x)
|
|
|
|
def get_out(self):
|
|
"""
|
|
Waits for a Task that task consumers add to :py:attr:`waflib.Runner.Parallel.out` after execution.
|
|
Adds more Tasks if necessary through :py:attr:`waflib.Runner.Parallel.add_more_tasks`.
|
|
|
|
:rtype: :py:attr:`waflib.Task.Task`
|
|
"""
|
|
tsk = self.out.get()
|
|
if not self.stop:
|
|
self.add_more_tasks(tsk)
|
|
self.mark_finished(tsk)
|
|
|
|
self.count -= 1
|
|
self.dirty = True
|
|
return tsk
|
|
|
|
def add_task(self, tsk):
|
|
"""
|
|
Enqueue a Task to :py:attr:`waflib.Runner.Parallel.ready` so that consumers can run them.
|
|
|
|
:param tsk: task instance
|
|
:type tsk: :py:attr:`waflib.Task.Task`
|
|
"""
|
|
# TODO change in waf 2.1
|
|
self.ready.put(tsk)
|
|
|
|
def _add_task(self, tsk):
|
|
if hasattr(tsk, 'semaphore'):
|
|
sem = tsk.semaphore
|
|
try:
|
|
sem.acquire(tsk)
|
|
except IndexError:
|
|
sem.waiting.add(tsk)
|
|
return
|
|
|
|
self.count += 1
|
|
self.processed += 1
|
|
if self.numjobs == 1:
|
|
tsk.log_display(tsk.generator.bld)
|
|
try:
|
|
self.process_task(tsk)
|
|
finally:
|
|
self.out.put(tsk)
|
|
else:
|
|
self.add_task(tsk)
|
|
|
|
def process_task(self, tsk):
|
|
"""
|
|
Processes a task and attempts to stop the build in case of errors
|
|
"""
|
|
tsk.process()
|
|
if tsk.hasrun != Task.SUCCESS:
|
|
self.error_handler(tsk)
|
|
|
|
def skip(self, tsk):
|
|
"""
|
|
Mark a task as skipped/up-to-date
|
|
"""
|
|
tsk.hasrun = Task.SKIPPED
|
|
self.mark_finished(tsk)
|
|
|
|
def cancel(self, tsk):
|
|
"""
|
|
Mark a task as failed because of unsatisfiable dependencies
|
|
"""
|
|
tsk.hasrun = Task.CANCELED
|
|
self.mark_finished(tsk)
|
|
|
|
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 instance
|
|
:type tsk: :py:attr:`waflib.Task.Task`
|
|
"""
|
|
if not self.bld.keep:
|
|
self.stop = True
|
|
self.error.append(tsk)
|
|
|
|
def task_status(self, tsk):
|
|
"""
|
|
Obtains the task status to decide whether to run it immediately or not.
|
|
|
|
:return: the exit status, for example :py:attr:`waflib.Task.ASK_LATER`
|
|
:rtype: integer
|
|
"""
|
|
try:
|
|
return tsk.runnable_status()
|
|
except Exception:
|
|
self.processed += 1
|
|
tsk.err_msg = traceback.format_exc()
|
|
if not self.stop and self.bld.keep:
|
|
self.skip(tsk)
|
|
if self.bld.keep == 1:
|
|
# if -k stop on 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
|
|
else:
|
|
if Logs.verbose > 1:
|
|
self.error.append(tsk)
|
|
return Task.EXCEPTION
|
|
|
|
tsk.hasrun = Task.EXCEPTION
|
|
self.error_handler(tsk)
|
|
|
|
return Task.EXCEPTION
|
|
|
|
def start(self):
|
|
"""
|
|
Obtains Task instances from the BuildContext instance and adds the ones that need to be executed to
|
|
:py:class:`waflib.Runner.Parallel.ready` so that the :py:class:`waflib.Runner.Spawner` consumer thread
|
|
has them executed. Obtains the executed Tasks back from :py:class:`waflib.Runner.Parallel.out`
|
|
and marks the build as failed by setting the ``stop`` flag.
|
|
If only one job is used, then executes 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 is detected
|
|
break
|
|
|
|
st = self.task_status(tsk)
|
|
if st == Task.RUN_ME:
|
|
self._add_task(tsk)
|
|
elif st == Task.ASK_LATER:
|
|
self.postpone(tsk)
|
|
elif st == Task.SKIP_ME:
|
|
self.processed += 1
|
|
self.skip(tsk)
|
|
self.add_more_tasks(tsk)
|
|
elif st == Task.CANCEL_ME:
|
|
# A dependency problem has occurred, and the
|
|
# build is most likely run with `waf -k`
|
|
if Logs.verbose > 1:
|
|
self.error.append(tsk)
|
|
self.processed += 1
|
|
self.cancel(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()
|
|
|
|
self.ready.put(None)
|
|
if not self.stop:
|
|
assert not self.count
|
|
assert not self.postponed
|
|
assert not self.incomplete
|
|
|
|
def prio_and_split(self, tasks):
|
|
"""
|
|
Label input tasks with priority values, and return a pair containing
|
|
the tasks that are ready to run and the tasks that are necessarily
|
|
waiting for other tasks to complete.
|
|
|
|
The priority system is really meant as an optional layer for optimization:
|
|
dependency cycles are found quickly, and builds should be more efficient.
|
|
A high priority number means that a task is processed first.
|
|
|
|
This method can be overridden to disable the priority system::
|
|
|
|
def prio_and_split(self, tasks):
|
|
return tasks, []
|
|
|
|
:return: A pair of task lists
|
|
:rtype: tuple
|
|
"""
|
|
# to disable:
|
|
#return tasks, []
|
|
for x in tasks:
|
|
x.visited = 0
|
|
|
|
reverse = self.revdeps
|
|
|
|
groups_done = set()
|
|
for x in tasks:
|
|
for k in x.run_after:
|
|
if isinstance(k, Task.TaskGroup):
|
|
if k not in groups_done:
|
|
groups_done.add(k)
|
|
for j in k.prev:
|
|
reverse[j].add(k)
|
|
else:
|
|
reverse[k].add(x)
|
|
|
|
# the priority number is not the tree depth
|
|
def visit(n):
|
|
if isinstance(n, Task.TaskGroup):
|
|
return sum(visit(k) for k in n.next)
|
|
|
|
if n.visited == 0:
|
|
n.visited = 1
|
|
|
|
if n in reverse:
|
|
rev = reverse[n]
|
|
n.prio_order = n.tree_weight + len(rev) + sum(visit(k) for k in rev)
|
|
else:
|
|
n.prio_order = n.tree_weight
|
|
|
|
n.visited = 2
|
|
elif n.visited == 1:
|
|
raise Errors.WafError('Dependency cycle found!')
|
|
return n.prio_order
|
|
|
|
for x in tasks:
|
|
if x.visited != 0:
|
|
# must visit all to detect cycles
|
|
continue
|
|
try:
|
|
visit(x)
|
|
except Errors.WafError:
|
|
self.debug_cycles(tasks, reverse)
|
|
|
|
ready = []
|
|
waiting = []
|
|
for x in tasks:
|
|
for k in x.run_after:
|
|
if not k.hasrun:
|
|
waiting.append(x)
|
|
break
|
|
else:
|
|
ready.append(x)
|
|
return (ready, waiting)
|
|
|
|
def debug_cycles(self, tasks, reverse):
|
|
tmp = {}
|
|
for x in tasks:
|
|
tmp[x] = 0
|
|
|
|
def visit(n, acc):
|
|
if isinstance(n, Task.TaskGroup):
|
|
for k in n.next:
|
|
visit(k, acc)
|
|
return
|
|
if tmp[n] == 0:
|
|
tmp[n] = 1
|
|
for k in reverse.get(n, []):
|
|
visit(k, [n] + acc)
|
|
tmp[n] = 2
|
|
elif tmp[n] == 1:
|
|
lst = []
|
|
for tsk in acc:
|
|
lst.append(repr(tsk))
|
|
if tsk is n:
|
|
# exclude prior nodes, we want the minimum cycle
|
|
break
|
|
raise Errors.WafError('Task dependency cycle in "run_after" constraints: %s' % ''.join(lst))
|
|
for x in tasks:
|
|
visit(x, [])
|
|
|