From 99e6ecbb17fa9ffef8e77a043e44367810403dbd Mon Sep 17 00:00:00 2001
From: James M Snell <jasnell@gmail.com>
Date: Sun, 10 Jun 2018 15:12:11 -0700
Subject: workers,trace_events: set thread name for workers

Set the thread name for workers in trace events. Also,
use uint64_t for thread_id_ because there's really no
reason for those to be doubles

PR-URL: https://github.com/nodejs/node/pull/21246
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Ali Ijaz Sheikh <ofrobots@google.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>
---
 src/env-inl.h      |  4 ++--
 src/env.h          |  6 +++---
 src/node_worker.cc | 15 ++++++++++++---
 src/node_worker.h  |  2 +-
 4 files changed, 18 insertions(+), 9 deletions(-)

(limited to 'src')

diff --git a/src/env-inl.h b/src/env-inl.h
index c84fdf0bb8..bbb80c6f7a 100644
--- a/src/env-inl.h
+++ b/src/env-inl.h
@@ -598,11 +598,11 @@ inline bool Environment::is_main_thread() const {
   return thread_id_ == 0;
 }
 
-inline double Environment::thread_id() const {
+inline uint64_t Environment::thread_id() const {
   return thread_id_;
 }
 
-inline void Environment::set_thread_id(double id) {
+inline void Environment::set_thread_id(uint64_t id) {
   thread_id_ = id;
 }
 
diff --git a/src/env.h b/src/env.h
index 1a96abe106..786f0846f4 100644
--- a/src/env.h
+++ b/src/env.h
@@ -726,8 +726,8 @@ class Environment {
   bool is_stopping_worker() const;
 
   inline bool is_main_thread() const;
-  inline double thread_id() const;
-  inline void set_thread_id(double id);
+  inline uint64_t thread_id() const;
+  inline void set_thread_id(uint64_t id);
   inline worker::Worker* worker_context() const;
   inline void set_worker_context(worker::Worker* context);
   inline void add_sub_worker_context(worker::Worker* context);
@@ -881,7 +881,7 @@ class Environment {
   std::unordered_map<std::string, uint64_t> performance_marks_;
 
   bool can_call_into_js_ = true;
-  double thread_id_ = 0;
+  uint64_t thread_id_ = 0;
   std::unordered_set<worker::Worker*> sub_worker_contexts_;
 
 
diff --git a/src/node_worker.cc b/src/node_worker.cc
index 320b6703d4..c628e6295c 100644
--- a/src/node_worker.cc
+++ b/src/node_worker.cc
@@ -9,6 +9,8 @@
 #include "async_wrap.h"
 #include "async_wrap-inl.h"
 
+#include <string>
+
 using v8::ArrayBuffer;
 using v8::Context;
 using v8::Function;
@@ -30,7 +32,7 @@ namespace worker {
 
 namespace {
 
-double next_thread_id = 1;
+uint64_t next_thread_id = 1;
 Mutex next_thread_id_mutex;
 
 }  // anonymous namespace
@@ -44,7 +46,8 @@ Worker::Worker(Environment* env, Local<Object> wrap)
   }
   wrap->Set(env->context(),
             env->thread_id_string(),
-            Number::New(env->isolate(), thread_id_)).FromJust();
+            Number::New(env->isolate(),
+                        static_cast<double>(thread_id_))).FromJust();
 
   // Set up everything that needs to be set up in the parent environment.
   parent_port_ = MessagePort::New(env, env->context());
@@ -112,6 +115,11 @@ bool Worker::is_stopped() const {
 }
 
 void Worker::Run() {
+  std::string name = "WorkerThread ";
+  name += std::to_string(thread_id_);
+  TRACE_EVENT_METADATA1(
+      "__metadata", "thread_name", "name",
+      TRACE_STR_COPY(name.c_str()));
   MultiIsolatePlatform* platform = isolate_data_->platform();
   CHECK_NE(platform, nullptr);
 
@@ -418,7 +426,8 @@ void InitWorker(Local<Object> target,
   auto thread_id_string = FIXED_ONE_BYTE_STRING(env->isolate(), "threadId");
   target->Set(env->context(),
               thread_id_string,
-              Number::New(env->isolate(), env->thread_id())).FromJust();
+              Number::New(env->isolate(),
+                          static_cast<double>(env->thread_id()))).FromJust();
 }
 
 }  // anonymous namespace
diff --git a/src/node_worker.h b/src/node_worker.h
index 0a98d2f11e..d802b5cfef 100644
--- a/src/node_worker.h
+++ b/src/node_worker.h
@@ -62,7 +62,7 @@ class Worker : public AsyncWrap {
 
   bool thread_joined_ = true;
   int exit_code_ = 0;
-  double thread_id_ = -1;
+  uint64_t thread_id_ = -1;
 
   std::unique_ptr<MessagePortData> child_port_data_;
 
-- 
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