Initial public release of nearby library

Signed-off-by: Alexey Polyudov <apolyudov@google.com>
Change-Id: I85d490e448375aa4eb7b09680757c02fff1420b4

cpp/platform/impl/default/default_condition_variable.h

@@ -0,0 +1,44 @@
+// 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_IMPL_DEFAULT_DEFAULT_CONDITION_VARIABLE_H_
+#define PLATFORM_IMPL_DEFAULT_DEFAULT_CONDITION_VARIABLE_H_
+
+#include <pthread.h>
+
+#include "platform/api/condition_variable.h"
+#include "platform/impl/default/default_lock.h"
+#include "platform/ptr.h"
+
+namespace location {
+namespace nearby {
+
+class DefaultConditionVariable : public ConditionVariable {
+ public:
+  explicit DefaultConditionVariable(Ptr<DefaultLock> lock);
+  ~DefaultConditionVariable() override;
+
+  void notify() override;
+  Exception::Value wait() override;
+
+ private:
+  Ptr<DefaultLock> lock_;
+  pthread_condattr_t attr_;
+  pthread_cond_t cond_;
+};
+
+}  // namespace nearby
+}  // namespace location
+
+#endif  // PLATFORM_IMPL_DEFAULT_DEFAULT_CONDITION_VARIABLE_H_