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  • Committer: Martin Pool
  • Date: 2010-04-21 10:13:50 UTC
  • mto: This revision was merged to the branch mainline in revision 5189.
  • Revision ID: mbp@canonical.com-20100421101350-6eq02ssg8kx1tmb3
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bzrlib/tests/test_lsprof.py
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# Copyright (C) 2007, 2009, 2010 Canonical Ltd
 
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# Copyright (C) 2005, 2006 Canonical Ltd
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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import cPickle
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import os
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import threading
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import bzrlib
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from bzrlib import errors, tests
 
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from bzrlib import tests
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class _LSProfFeature(tests.Feature):
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        lines = [str(data) for data in stats.data]
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        lines = [line for line in lines if 'a_function' in line]
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        self.assertLength(1, lines)
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    def test_block_0(self):
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        # When profiler_block is 0, reentrant profile requests fail.
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        self.overrideAttr(bzrlib.lsprof.BzrProfiler, 'profiler_block', 0)
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        inner_calls = []
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        def inner():
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            profiler = bzrlib.lsprof.BzrProfiler()
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            self.assertRaises(errors.BzrError, profiler.start)
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            inner_calls.append(True)
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        bzrlib.lsprof.profile(inner)
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        self.assertLength(1, inner_calls)
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    def test_block_1(self):
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        # When profiler_block is 1, concurrent profiles serialise.
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        # This is tested by manually acquiring the profiler lock, then
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        # starting a thread that tries to profile, and releasing the lock. 
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        # We know due to test_block_0 that two profiles at once hit the lock,
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        # so while this isn't perfect (we'd want a callback on the lock being
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        # entered to allow lockstep evaluation of the actions), its good enough
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        # to be confident regressions would be caught. Alternatively, if this
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        # is flakey, a fake Lock object can be used to trace the calls made.
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        calls = []
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        def profiled():
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            calls.append('profiled')
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        def do_profile():
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            bzrlib.lsprof.profile(profiled)
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            calls.append('after_profiled')
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        thread = threading.Thread(target=do_profile)
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        bzrlib.lsprof.BzrProfiler.profiler_lock.acquire()
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        try:
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            try:
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                thread.start()
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            finally:
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                bzrlib.lsprof.BzrProfiler.profiler_lock.release()
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        finally:
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            thread.join()
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        self.assertLength(2, calls)