1/* Copyright 2021 The TensorFlow Authors. All Rights Reserved.
2
3Licensed under the Apache License, Version 2.0 (the "License");
4you may not use this file except in compliance with the License.
5You may obtain a copy of the License at
6
7 http://www.apache.org/licenses/LICENSE-2.0
8
9Unless required by applicable law or agreed to in writing, software
10distributed under the License is distributed on an "AS IS" BASIS,
11WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12See the License for the specific language governing permissions and
13limitations under the License.
14==============================================================================*/
15
16#include "tensorflow/tsl/util/determinism.h"
17
18#include "absl/strings/string_view.h"
19#include "tensorflow/tsl/platform/mutex.h"
20#include "tensorflow/tsl/util/env_var.h"
21
22namespace tsl {
23
24namespace {
25
26class DeterminismState {
27 public:
28 explicit DeterminismState(absl::string_view env_var) : env_var_(env_var) {}
29 bool Required() {
30 mutex_lock l(*mutex_);
31
32 if (state_ == Value::NOT_SET) {
33 bool env_var_set = false;
34 TF_CHECK_OK(tsl::ReadBoolFromEnvVar(env_var_,
35 /*default_val=*/false, &env_var_set));
36 state_ = env_var_set ? Value::ENABLED : Value::DISABLED;
37 }
38
39 return state_ == Value::ENABLED;
40 }
41 void Enable(bool enabled) {
42 mutex_lock l(*mutex_);
43 state_ = enabled ? Value::ENABLED : Value::DISABLED;
44 }
45
46 private:
47 absl::string_view env_var_;
48 enum class Value { DISABLED, ENABLED, NOT_SET };
49 mutex* mutex_ = new mutex;
50 Value state_ = Value::NOT_SET;
51};
52
53} // namespace
54
55DeterminismState OpDeterminismState = DeterminismState("TF_DETERMINISTIC_OPS");
56DeterminismState OpOrderDeterminismState =
57 DeterminismState("TF_DETERMINISTIC_ORDER");
58
59bool OpDeterminismRequired() { return OpDeterminismState.Required(); }
60void EnableOpDeterminism(bool enabled) { OpDeterminismState.Enable(enabled); }
61bool OpOrderDeterminismRequired() { return OpOrderDeterminismState.Required(); }
62
63} // namespace tsl
64