1# Copyright 2020 The TensorFlow Authors. All Rights Reserved. 2# 3# Licensed under the Apache License, Version 2.0 (the "License"); 4# you may not use this file except in compliance with the License. 5# You may obtain a copy of the License at 6# 7# http://www.apache.org/licenses/LICENSE-2.0 8# 9# Unless required by applicable law or agreed to in writing, software 10# distributed under the License is distributed on an "AS IS" BASIS, 11# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12# See the License for the specific language governing permissions and 13# limitations under the License. 14# ============================================================================== 15"""Thread-local context manager stack.""" 16 17from __future__ import absolute_import 18from __future__ import division 19from __future__ import print_function 20 21import contextlib 22 23from tensorflow.python.framework.experimental import thread_local_stack 24 25_default_ctx_stack = thread_local_stack.ThreadLocalStack() 26 27 28def get_default(): 29 """Returns the default execution context.""" 30 return _default_ctx_stack.peek() 31 32 33@contextlib.contextmanager 34def set_default(ctx): 35 """Returns a contextmanager with `ctx` as the default execution context.""" 36 try: 37 _default_ctx_stack.push(ctx) 38 yield 39 finally: 40 _default_ctx_stack.pop() 41