nearby sdk refactor

PiperOrigin-RevId: 425434260

internal/platform/implementation/condition_variable.h

@@ -0,0 +1,51 @@
+// Copyright 2020 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef PLATFORM_API_CONDITION_VARIABLE_H_
+#define PLATFORM_API_CONDITION_VARIABLE_H_
+
+#include "absl/time/clock.h"
+#include "internal/platform/exception.h"
+
+namespace location {
+namespace nearby {
+namespace api {
+
+// The ConditionVariable class is a synchronization primitive that can be used
+// to block a thread, or multiple threads at the same time, until another thread
+// both modifies a shared variable (the condition), and notifies the
+// ConditionVariable.
+class ConditionVariable {
+ public:
+  virtual ~ConditionVariable() {}
+
+  // Notifies all the waiters that condition state has changed.
+  virtual void Notify() = 0;
+
+  // Waits indefinitely for Notify to be called.
+  // May return prematurely in case of interrupt, if supported by platform.
+  // Returns kSuccess, or kInterrupted on interrupt.
+  virtual Exception Wait() = 0;
+
+  // Waits while timeout has not expired for Notify to be called.
+  // May return prematurely in case of interrupt, if supported by platform.
+  // Returns kSuccess, or kInterrupted on interrupt.
+  virtual Exception Wait(absl::Duration timeout) = 0;
+};
+
+}  // namespace api
+}  // namespace nearby
+}  // namespace location
+
+#endif  // PLATFORM_API_CONDITION_VARIABLE_H_