mirror of https://gitlab.com/ita1024/waf.git
65 lines
1.5 KiB
Python
65 lines
1.5 KiB
Python
#! /usr/bin/env python
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# encoding: utf-8
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# Thomas Nagy, 2011-2015 (ita)
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"""
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Prevents link tasks from executing in parallel. This can be used to
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improve the linker execution, which may use a lot of memory.
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The variable 'MAX' represents the tasks able to run
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concurrently (just one by default). The variable 'count'
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is the amount of tasks of one kind being executed.
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Different constraints can be enforced by changing the scope
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of some variables. Remember that:
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* the counter could be set on the class level
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* the MAX amount of concurrent tasks can be more than 1
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"""
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from waflib.Utils import threading
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from waflib import Task
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lock = threading.Lock()
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count = 0
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MAX = 1
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def make_exclusive(cls):
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old_runnable_status = cls.runnable_status
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def runnable_status(self):
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global count, lock, MAX
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ret = Task.ASK_LATER
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if count >= MAX:
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return ret
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self.m1_excl = getattr(self, 'm1_excl', 0) + 1
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ret = old_runnable_status(self)
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self.m1_excl -= 1
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if ret == Task.RUN_ME and not self.m1_excl:
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lock.acquire()
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count += 1
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lock.release()
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return ret
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cls.runnable_status = runnable_status
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old_run = cls.run
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def run(self):
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global count, lock
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try:
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self.m2_excl = getattr(self, 'm2_excl', 0) + 1
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ret = old_run(self)
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finally:
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self.m2_excl -= 1
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if not self.m2_excl:
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lock.acquire()
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count -= 1
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lock.release()
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return ret
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cls.run = run
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for x in 'cprogram cxxprogram cshlib cxxshlib cstlib cxxstlib fcprogram fcshlib fcstlib'.split():
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if x in Task.classes:
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make_exclusive(Task.classes[x])
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