Add buffer pool public apis

include/grpc/grpc.h

@@ -401,6 +401,22 @@ GRPCAPI int grpc_is_binary_header(const char *key, size_t length);
 /** Convert grpc_call_error values to a string */
 GRPCAPI const char *grpc_call_error_to_string(grpc_call_error error);
 
+/** Create a buffer pool */
+GRPCAPI grpc_buffer_pool *grpc_buffer_pool_create(void);
+
+/** Add a reference to a buffer pool */
+GRPCAPI void grpc_buffer_pool_ref(grpc_buffer_pool *buffer_pool);
+
+/** Drop a reference to a buffer pool */
+GRPCAPI void grpc_buffer_pool_unref(grpc_buffer_pool *buffer_pool);
+
+/** Update the size of a buffer pool */
+GRPCAPI void grpc_buffer_pool_resize(grpc_buffer_pool *buffer_pool,
+                                     size_t new_size);
+
+/** Fetch a vtable for a grpc_channel_arg that points to a grpc_buffer_pool */
+GRPCAPI grpc_arg_pointer_vtable *grpc_buffer_pool_arg_vtable(void);
+
 #ifdef __cplusplus
 }
 #endif

include/grpc/impl/codegen/grpc_types.h

@@ -196,6 +196,9 @@ typedef struct {
 #define GRPC_ARG_MAX_METADATA_SIZE "grpc.max_metadata_size"
 /** If non-zero, allow the use of SO_REUSEPORT if it's available (default 1) */
 #define GRPC_ARG_ALLOW_REUSEPORT "grpc.so_reuseport"
+/** If non-zero, a pointer to a buffer pool (use grpc_buffer_pool_arg_vtable to
+    fetch an appropriate pointer arg vtable */
+#define GRPC_ARG_BUFFER_POOL "grpc.buffer_pool"
 /** \} */
 
 /** Result of a grpc call. If the caller satisfies the prerequisites of a
@@ -445,6 +448,8 @@ typedef struct grpc_op {
   } data;
 } grpc_op;
 
+typedef struct grpc_buffer_pool grpc_buffer_pool;
+
 #ifdef __cplusplus
 }
 #endif