nearby: snapshot of cl/304428753

Signed-off-by: Alexey Polyudov <apolyudov@google.com>
Change-Id: I0023ac6e40456fc4a8169c3173bcbff3b5ccc476

cpp/platform/api2/condition_variable.h

@@ -0,0 +1,26 @@
+#ifndef PLATFORM_API2_CONDITION_VARIABLE_H_
+#define PLATFORM_API2_CONDITION_VARIABLE_H_
+
+#include "platform/exception.h"
+
+namespace location {
+namespace nearby {
+
+// 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() {}
+
+  // https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#notify--
+  virtual void Notify() = 0;
+  // https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait--
+  virtual Exception Wait() = 0;  // throws Exception::kInterrupted
+};
+
+}  // namespace nearby
+}  // namespace location
+
+#endif  // PLATFORM_API2_CONDITION_VARIABLE_H_