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Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/22958 When we use `extension_loader.DlopenGuard()` to dyndep or import modules, it sets a `RTLD_GLOBAL` flag, and restores the original flags after the `yield`. However, if the modules is not there, yield will fail, and the flags won't be restored, creating all kinds of symbol conflict problems. Reviewed By: bddppq Differential Revision: D16311949 fbshipit-source-id: 7b9ec6d60423ec5e78cae694b66c2f17493840b0
30 lines
889 B
Python
30 lines
889 B
Python
## @package extension_loader
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# Module caffe2.python.extension_loader
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from __future__ import absolute_import
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from __future__ import division
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from __future__ import print_function
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from __future__ import unicode_literals
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import contextlib
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import ctypes
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import sys
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_set_global_flags = (
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hasattr(sys, 'getdlopenflags') and hasattr(sys, 'setdlopenflags'))
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@contextlib.contextmanager
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def DlopenGuard(extra_flags=ctypes.RTLD_GLOBAL):
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if _set_global_flags:
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old_flags = sys.getdlopenflags()
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sys.setdlopenflags(old_flags | extra_flags)
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# in case we dlopen something that doesn't exist, yield will fail and throw;
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# we need to remember reset the old flags to clean up, otherwise RTLD_GLOBAL
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# flag will stick around and create symbol conflict problems
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try:
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yield
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finally:
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if _set_global_flags:
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sys.setdlopenflags(old_flags)
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