Make the core callback interface API so that it can be used in generated code

1 files changed, 14 insertions, 1 deletions

diff --git a/include/grpc/impl/codegen/grpc_types.h b/include/grpc/impl/codegen/grpc_types.h
index 5f3b96f40b..5bd50bc9ac 100644
--- a/include/grpc/impl/codegen/grpc_types.h
+++ b/include/grpc/impl/codegen/grpc_types.h
@@ -660,6 +660,19 @@ typedef enum {
   GRPC_CQ_CALLBACK
 } grpc_cq_completion_type;
 
+/** EXPERIMENTAL: Specifies an interface class to be used as a tag
+    for callback-based completion queues. This can be used directly,
+    as the first element of a struct in C, or as a base class in C++.
+    Its "run" value should be assigned to some non-member function, such as
+    a static method. */
+typedef struct grpc_experimental_completion_queue_functor {
+  /** The run member specifies a function that will be called when this
+      tag is extracted from the completion queue. Its arguments will be a
+      pointer to this functor and a boolean that indicates whether the
+      success status of this operation */
+  void (*functor_run)(struct grpc_experimental_completion_queue_functor*, int);
+} grpc_experimental_completion_queue_functor;
+
 /* The upgrade to version 2 is currently experimental. */
 
 #define GRPC_CQ_CURRENT_VERSION 2
@@ -678,7 +691,7 @@ typedef struct grpc_completion_queue_attributes {
   /* EXPERIMENTAL: START OF VERSION 2 CQ ATTRIBUTES */
   /** When creating a callbackable CQ, pass in a functor to get invoked when
    * shutdown is complete */
-  void* cq_shutdown_cb;
+  grpc_experimental_completion_queue_functor* cq_shutdown_cb;
 
   /* END OF VERSION 2 CQ ATTRIBUTES */
 } grpc_completion_queue_attributes;