src: split ownsProcessState off isMainThread

Embedders may want to control whether a Node.js instance
controls the current process, similar to what we currently
have with `Worker`s.

Previously, the `isMainThread` flag had a bit of a double usage,
both for indicating whether we are (not) running a Worker and
whether we can modify per-process state.

PR-URL: https://github.com/nodejs/node/pull/25881
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/inspector/tracing_agent.cc b/src/inspector/tracing_agent.cc
index fb8467a1b9..09d213d8ae 100644
--- a/src/inspector/tracing_agent.cc
+++ b/src/inspector/tracing_agent.cc
@@ -141,7 +141,7 @@ DispatchResponse TracingAgent::start(
     return DispatchResponse::Error(
         "Call NodeTracing::end to stop tracing before updating the config");
   }
-  if (!env_->is_main_thread()) {
+  if (!env_->owns_process_state()) {
     return DispatchResponse::Error(
         "Tracing properties can only be changed through main thread sessions");
   }