Enable RDC policy feature

1. Add policy APIs
2. Add policy example for policy API usage

Change-Id: I14deb7c809d0b865b7bb083842092fc37868025e
Signed-off-by: Chao Fei <Chao.Fei@amd.com>

include/rdc_lib/impl/RdcStandaloneHandler.h

@@ -24,6 +24,8 @@ THE SOFTWARE.
 #include <grpcpp/grpcpp.h>
 
 #include <memory>
+#include <future>
+#include <thread>
 
 #include "rdc.grpc.pb.h"  // NOLINT
 #include "rdc_lib/RdcHandler.h"
@@ -89,6 +91,18 @@ class RdcStandaloneHandler : public RdcHandler {
   // It is just a client interface under the GRPC framework and is not used as an RDC API.
   // Pure virtual functions need to be overridden
   rdc_status_t get_mixed_component_version(mixed_component_t component, mixed_component_version_t* p_mixed_compv) override;
+  // Policy API
+  rdc_status_t rdc_policy_set(rdc_gpu_group_t group_id, rdc_policy_t policy) override;
+
+  rdc_status_t rdc_policy_get(rdc_gpu_group_t group_id, uint32_t* count, rdc_policy_t policies[RDC_MAX_POLICY_SETTINGS]) override;
+
+  rdc_status_t rdc_policy_delete(rdc_gpu_group_t group_id,
+                                 rdc_policy_condition_type_t condition_type) override;
+
+  rdc_status_t rdc_policy_register(rdc_gpu_group_t group_id,
+                                   rdc_policy_register_callback callback) override;
+
+  rdc_status_t rdc_policy_unregister(rdc_gpu_group_t group_id) override;
 
   explicit RdcStandaloneHandler(const char* ip_and_port, const char* root_ca,
                                 const char* client_cert, const char* client_key);
@@ -100,6 +114,15 @@ class RdcStandaloneHandler : public RdcHandler {
   bool copy_gpu_usage_info(const ::rdc::GpuUsageInfo& src, rdc_gpu_usage_info_t* target);
 
   std::unique_ptr<::rdc::RdcAPI::Stub> stub_;
+  // thread for policy callback
+
+  struct policy_thread_context {
+    bool start;
+    std::thread *t;
+  };
+
+  std::map<uint32_t, struct policy_thread_context> policy_threads_;
+
 };
 
 }  // namespace rdc