47 lines
1.9 KiB
Python
47 lines
1.9 KiB
Python
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# Copyright 2017 The TensorFlow Authors. All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# =============================================================================
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"""If possible, exports all symbols with RTLD_GLOBAL.
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Note that this file is only imported by pywrap_tensorflow.py if this is a static
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build (meaning there is no explicit framework cc_binary shared object dependency
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of _pywrap_tensorflow_internal.so). For regular (non-static) builds, RTLD_GLOBAL
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is not necessary, since the dynamic dependencies of custom/contrib ops are
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explicit.
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"""
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import ctypes
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import sys
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# On UNIX-based platforms, pywrap_tensorflow is a SWIG-generated python library
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# that dynamically loads _pywrap_tensorflow.so. The default mode for loading
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# keeps all the symbol private and not visible to other libraries that may be
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# loaded. Setting the mode to RTLD_GLOBAL to make the symbols visible, so that
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# custom op libraries imported using `tf.load_op_library()` can access symbols
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# defined in _pywrap_tensorflow.so.
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_use_rtld_global = (hasattr(sys, 'getdlopenflags')
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and hasattr(sys, 'setdlopenflags'))
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if _use_rtld_global:
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_default_dlopen_flags = sys.getdlopenflags()
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def set_dlopen_flags():
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if _use_rtld_global:
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sys.setdlopenflags(_default_dlopen_flags | ctypes.RTLD_GLOBAL)
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def reset_dlopen_flags():
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if _use_rtld_global:
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sys.setdlopenflags(_default_dlopen_flags)
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