Mercurial Repositories > eric / file comparison
comparison: DebugClients/Python/coverage/monkey.py
DebugClients/Python/coverage/monkey.py
- changeset 4489
- d0d6e4ad31bd
- child 5051
- 3586ebd9fac8
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| 4481:456c58fc64b0 | 4489:d0d6e4ad31bd |
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| 1 # Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0 | |
| 2 # For details: https://bitbucket.org/ned/coveragepy/src/default/NOTICE.txt | |
| 3 | |
| 4 """Monkey-patching to make coverage.py work right in some cases.""" | |
| 5 | |
| 6 import multiprocessing | |
| 7 import multiprocessing.process | |
| 8 import sys | |
| 9 | |
| 10 # An attribute that will be set on modules to indicate that they have been | |
| 11 # monkey-patched. | |
| 12 PATCHED_MARKER = "_coverage$patched" | |
| 13 | |
| 14 | |
| 15 def patch_multiprocessing(): | |
| 16 """Monkey-patch the multiprocessing module. | |
| 17 | |
| 18 This enables coverage measurement of processes started by multiprocessing. | |
| 19 This is wildly experimental! | |
| 20 | |
| 21 """ | |
| 22 if hasattr(multiprocessing, PATCHED_MARKER): | |
| 23 return | |
| 24 | |
| 25 if sys.version_info >= (3, 4): | |
| 26 klass = multiprocessing.process.BaseProcess | |
| 27 else: | |
| 28 klass = multiprocessing.Process | |
| 29 | |
| 30 original_bootstrap = klass._bootstrap | |
| 31 | |
| 32 class ProcessWithCoverage(klass): | |
| 33 """A replacement for multiprocess.Process that starts coverage.""" | |
| 34 def _bootstrap(self): | |
| 35 """Wrapper around _bootstrap to start coverage.""" | |
| 36 from coverage import Coverage | |
| 37 cov = Coverage(data_suffix=True) | |
| 38 cov.start() | |
| 39 try: | |
| 40 return original_bootstrap(self) | |
| 41 finally: | |
| 42 cov.stop() | |
| 43 cov.save() | |
| 44 | |
| 45 if sys.version_info >= (3, 4): | |
| 46 klass._bootstrap = ProcessWithCoverage._bootstrap | |
| 47 else: | |
| 48 multiprocessing.Process = ProcessWithCoverage | |
| 49 | |
| 50 setattr(multiprocessing, PATCHED_MARKER, True) |
