Removing instances of exec_ctx being passed around in functions in

src/core. exec_ctx is now a thread_local pointer of type ExecCtx instead of
grpc_exec_ctx which is initialized whenever ExecCtx is instantiated. ExecCtx
also keeps track of the previous exec_ctx so that nesting of exec_ctx is
allowed. This means that there is only one exec_ctx being used at any
time. Also, grpc_exec_ctx_finish is called in the destructor of the
object, and the previous exec_ctx is restored to avoid breaking current
functionality. The code still explicitly calls grpc_exec_ctx_finish
because removing all such instances causes the code to break.

1 files changed, 6 insertions, 8 deletions

diff --git a/src/core/ext/filters/client_channel/proxy_mapper.h b/src/core/ext/filters/client_channel/proxy_mapper.h
index bb8259f854..d4a3793e8a 100644
--- a/src/core/ext/filters/client_channel/proxy_mapper.h
+++ b/src/core/ext/filters/client_channel/proxy_mapper.h
@@ -36,14 +36,14 @@ typedef struct {
   /// If no proxy is needed, returns false.
   /// Otherwise, sets \a name_to_resolve, optionally sets \a new_args,
   /// and returns true.
-  bool (*map_name)(grpc_exec_ctx* exec_ctx, grpc_proxy_mapper* mapper,
-                   const char* server_uri, const grpc_channel_args* args,
-                   char** name_to_resolve, grpc_channel_args** new_args);
+  bool (*map_name)(grpc_proxy_mapper* mapper, const char* server_uri,
+                   const grpc_channel_args* args, char** name_to_resolve,
+                   grpc_channel_args** new_args);
   /// Determines the proxy address to use to contact \a address.
   /// If no proxy is needed, returns false.
   /// Otherwise, sets \a new_address, optionally sets \a new_args, and
   /// returns true.
-  bool (*map_address)(grpc_exec_ctx* exec_ctx, grpc_proxy_mapper* mapper,
+  bool (*map_address)(grpc_proxy_mapper* mapper,
                       const grpc_resolved_address* address,
                       const grpc_channel_args* args,
                       grpc_resolved_address** new_address,
@@ -59,15 +59,13 @@ struct grpc_proxy_mapper {
 void grpc_proxy_mapper_init(const grpc_proxy_mapper_vtable* vtable,
                             grpc_proxy_mapper* mapper);
 
-bool grpc_proxy_mapper_map_name(grpc_exec_ctx* exec_ctx,
-                                grpc_proxy_mapper* mapper,
+bool grpc_proxy_mapper_map_name(grpc_proxy_mapper* mapper,
                                 const char* server_uri,
                                 const grpc_channel_args* args,
                                 char** name_to_resolve,
                                 grpc_channel_args** new_args);
 
-bool grpc_proxy_mapper_map_address(grpc_exec_ctx* exec_ctx,
-                                   grpc_proxy_mapper* mapper,
+bool grpc_proxy_mapper_map_address(grpc_proxy_mapper* mapper,
                                    const grpc_resolved_address* address,
                                    const grpc_channel_args* args,
                                    grpc_resolved_address** new_address,