nearby: snapshot of cl/313536507

Signed-off-by: Alexey Polyudov <apolyudov@google.com>
Change-Id: I8936b527079074d5c3af5531b9245063767cc4a7

cpp/platform_v2/impl/shared/posix_mutex.h

@@ -0,0 +1,31 @@
+#ifndef PLATFORM_V2_IMPL_SHARED_POSIX_MUTEX_H_
+#define PLATFORM_V2_IMPL_SHARED_POSIX_MUTEX_H_
+
+#include <pthread.h>
+
+#include "platform_v2/api/mutex.h"
+
+namespace location {
+namespace nearby {
+namespace posix {
+
+class ABSL_LOCKABLE Mutex : public api::Mutex {
+ public:
+  Mutex();
+  ~Mutex() override;
+
+  void Lock() ABSL_EXCLUSIVE_LOCK_FUNCTION() override;
+  void Unlock() ABSL_UNLOCK_FUNCTION() override;
+
+ private:
+  friend class ConditionVariable;
+
+  pthread_mutexattr_t attr_;
+  pthread_mutex_t mutex_;
+};
+
+}  // namespace posix
+}  // namespace nearby
+}  // namespace location
+
+#endif  // PLATFORM_V2_IMPL_SHARED_POSIX_MUTEX_H_