mirror of
https://gitlab.com/ita1024/waf.git
synced 2024-12-23 09:45:13 +01:00
362 lines
8.5 KiB
Python
362 lines
8.5 KiB
Python
#!/usr/bin/env python
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# encoding: utf-8
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# Thomas Nagy, 2005-2010 (ita)
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"""
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Runner.py: Task scheduling and execution
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"""
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import random, atexit
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try:
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from queue import Queue
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except ImportError:
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from Queue import Queue
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from waflib import Utils, Task, Errors, Logs
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GAP = 10
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"""
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Wait for free tasks if there are at least ``GAP * njobs`` in queue
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"""
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class TaskConsumer(Utils.threading.Thread):
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"""
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Task consumers belong to a pool of workers
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They wait for tasks in the queue and then use ``task.process(...)``
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"""
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def __init__(self):
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Utils.threading.Thread.__init__(self)
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self.ready = Queue()
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"""
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Obtain :py:class:`waflib.Task.TaskBase` instances from this queue.
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"""
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self.setDaemon(1)
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self.start()
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def run(self):
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"""
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Loop over the tasks to execute
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"""
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try:
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self.loop()
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except Exception:
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pass
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def loop(self):
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"""
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Obtain tasks from :py:attr:`waflib.Runner.TaskConsumer.ready` and call
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:py:meth:`waflib.Task.TaskBase.process`. If the object is a function, execute it.
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"""
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while 1:
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tsk = self.ready.get()
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if not isinstance(tsk, Task.TaskBase):
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tsk(self)
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else:
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tsk.process()
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pool = Queue()
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"""
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Pool of task consumer objects
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"""
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def get_pool():
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"""
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Obtain a task consumer from :py:attr:`waflib.Runner.pool`.
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Do not forget to put it back by using :py:func:`waflib.Runner.put_pool`
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and reset properly (original waiting queue).
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:rtype: :py:class:`waflib.Runner.TaskConsumer`
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"""
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try:
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return pool.get(False)
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except Exception:
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return TaskConsumer()
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def put_pool(x):
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"""
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Return a task consumer to the thread pool :py:attr:`waflib.Runner.pool`
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:param x: task consumer object
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:type x: :py:class:`waflib.Runner.TaskConsumer`
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"""
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pool.put(x)
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def _free_resources():
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global pool
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lst = []
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while pool.qsize():
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lst.append(pool.get())
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for x in lst:
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x.ready.put(None)
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for x in lst:
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x.join()
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pool = None
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atexit.register(_free_resources)
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class Parallel(object):
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"""
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Schedule the tasks obtained from the build context for execution.
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"""
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def __init__(self, bld, j=2):
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"""
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The initialization requires a build context reference
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for computing the total number of jobs.
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"""
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self.numjobs = j
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"""
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Number of consumers in the pool
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"""
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self.bld = bld
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"""
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Instance of :py:class:`waflib.Build.BuildContext`
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"""
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self.outstanding = []
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"""List of :py:class:`waflib.Task.TaskBase` that may be ready to be executed"""
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self.frozen = []
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"""List of :py:class:`waflib.Task.TaskBase` that cannot be executed immediately"""
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self.out = Queue(0)
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"""List of :py:class:`waflib.Task.TaskBase` returned by the task consumers"""
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self.count = 0
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"""Amount of tasks that may be processed by :py:class:`waflib.Runner.TaskConsumer`"""
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self.processed = 1
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"""Amount of tasks processed"""
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self.stop = False
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"""Error flag to stop the build"""
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self.error = []
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"""Tasks that could not be executed"""
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self.biter = None
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"""Task iterator which must give groups of parallelizable tasks when calling ``next()``"""
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self.dirty = False
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"""Flag to indicate that tasks have been executed, and that the build cache must be saved (call :py:meth:`waflib.Build.BuildContext.store`)"""
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def get_next_task(self):
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"""
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Obtain the next task to execute.
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:rtype: :py:class:`waflib.Task.TaskBase`
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"""
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if not self.outstanding:
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return None
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return self.outstanding.pop(0)
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def postpone(self, tsk):
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"""
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A task cannot be executed at this point, put it in the list :py:attr:`waflib.Runner.Parallel.frozen`.
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:param tsk: task
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:type tsk: :py:class:`waflib.Task.TaskBase`
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"""
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if random.randint(0, 1):
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self.frozen.insert(0, tsk)
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else:
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self.frozen.append(tsk)
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def refill_task_list(self):
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"""
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Put the next group of tasks to execute in :py:attr:`waflib.Runner.Parallel.outstanding`.
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"""
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while self.count > self.numjobs * GAP:
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self.get_out()
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while not self.outstanding:
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if self.count:
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self.get_out()
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elif self.frozen:
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try:
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cond = self.deadlock == self.processed
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except AttributeError:
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pass
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else:
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if cond:
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msg = 'check the build order for the tasks'
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for tsk in self.frozen:
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if not tsk.run_after:
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msg = 'check the methods runnable_status'
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break
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lst = []
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for tsk in self.frozen:
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lst.append('%s\t-> %r' % (repr(tsk), [id(x) for x in tsk.run_after]))
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raise Errors.WafError('Deadlock detected: %s%s' % (msg, ''.join(lst)))
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self.deadlock = self.processed
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if self.frozen:
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self.outstanding += self.frozen
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self.frozen = []
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elif not self.count:
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self.outstanding.extend(next(self.biter))
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self.total = self.bld.total()
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break
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def add_more_tasks(self, tsk):
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"""
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Tasks may be added dynamically during the build by binding them to the task :py:attr:`waflib.Task.TaskBase.more_tasks`
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:param tsk: task
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:type tsk: :py:attr:`waflib.Task.TaskBase`
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"""
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if getattr(tsk, 'more_tasks', None):
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self.outstanding += tsk.more_tasks
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self.total += len(tsk.more_tasks)
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def get_out(self):
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"""
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Obtain one task returned from the task consumers, and update the task count. Add more tasks if necessary through
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:py:attr:`waflib.Runner.Parallel.add_more_tasks`.
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:rtype: :py:attr:`waflib.Task.TaskBase`
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"""
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tsk = self.out.get()
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if not self.stop:
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self.add_more_tasks(tsk)
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self.count -= 1
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self.dirty = True
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return tsk
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def error_handler(self, tsk):
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"""
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Called when a task cannot be executed. The flag :py:attr:`waflib.Runner.Parallel.stop` is set, unless
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the build is executed with::
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$ waf build -k
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:param tsk: task
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:type tsk: :py:attr:`waflib.Task.TaskBase`
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"""
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if not self.bld.keep:
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self.stop = True
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self.error.append(tsk)
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def add_task(self, tsk):
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"""
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Pass a task to a consumer.
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:param tsk: task
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:type tsk: :py:attr:`waflib.Task.TaskBase`
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"""
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try:
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self.pool
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except AttributeError:
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self.init_task_pool()
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self.ready.put(tsk)
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def init_task_pool(self):
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# lazy creation, and set a common pool for all task consumers
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pool = self.pool = [get_pool() for i in range(self.numjobs)]
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self.ready = Queue(0)
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def setq(consumer):
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consumer.ready = self.ready
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for x in pool:
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x.ready.put(setq)
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return pool
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def free_task_pool(self):
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# return the consumers, setting a different queue for each of them
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def setq(consumer):
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consumer.ready = Queue(0)
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self.out.put(self)
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try:
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pool = self.pool
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except AttributeError:
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pass
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else:
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for x in pool:
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self.ready.put(setq)
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for x in pool:
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self.get_out()
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for x in pool:
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put_pool(x)
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self.pool = []
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def start(self):
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"""
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Give tasks to :py:class:`waflib.Runner.TaskConsumer` instances until the build finishes or the ``stop`` flag is set.
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If only one job is used, then execute the tasks one by one, without consumers.
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"""
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self.total = self.bld.total()
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while not self.stop:
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self.refill_task_list()
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# consider the next task
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tsk = self.get_next_task()
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if not tsk:
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if self.count:
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# tasks may add new ones after they are run
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continue
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else:
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# no tasks to run, no tasks running, time to exit
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break
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if tsk.hasrun:
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# if the task is marked as "run", just skip it
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self.processed += 1
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continue
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if self.stop: # stop immediately after a failure was detected
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break
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try:
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st = tsk.runnable_status()
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except Exception:
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self.processed += 1
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# TODO waf 1.7 this piece of code should go in the error_handler
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tsk.err_msg = Utils.ex_stack()
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if not self.stop and self.bld.keep:
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tsk.hasrun = Task.SKIPPED
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if self.bld.keep == 1:
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# if -k stop at the first exception, if -kk try to go as far as possible
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if Logs.verbose > 1 or not self.error:
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self.error.append(tsk)
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self.stop = True
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else:
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if Logs.verbose > 1:
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self.error.append(tsk)
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continue
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tsk.hasrun = Task.EXCEPTION
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self.error_handler(tsk)
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continue
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if st == Task.ASK_LATER:
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self.postpone(tsk)
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elif st == Task.SKIP_ME:
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self.processed += 1
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tsk.hasrun = Task.SKIPPED
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self.add_more_tasks(tsk)
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else:
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# run me: put the task in ready queue
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tsk.position = (self.processed, self.total)
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self.count += 1
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tsk.master = self
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self.processed += 1
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if self.numjobs == 1:
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tsk.process()
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else:
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self.add_task(tsk)
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# self.count represents the tasks that have been made available to the consumer threads
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# collect all the tasks after an error else the message may be incomplete
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while self.error and self.count:
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self.get_out()
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#print loop
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assert (self.count == 0 or self.stop)
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# free the task pool, if any
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self.free_task_pool()
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