From 8fcaa80a91d70e26b749d1220bb1ec6d10c85cd6 Mon Sep 17 00:00:00 2001
From: John Hawthorn <john@hawthorn.email>
Date: Sat, 9 Dec 2023 02:00:59 -0800
Subject: [PATCH] Call pthread_setname_np if available

---
 ext/vernier/extconf.rb | 2 ++
 ext/vernier/vernier.cc | 7 +++++++
 2 files changed, 9 insertions(+)

diff --git a/ext/vernier/extconf.rb b/ext/vernier/extconf.rb
index 9d32315..0c6b93d 100644
--- a/ext/vernier/extconf.rb
+++ b/ext/vernier/extconf.rb
@@ -10,4 +10,6 @@
 
 have_func("rb_profile_thread_frames", "ruby/debug.h")
 
+have_func("pthread_setname_np")
+
 create_makefile("vernier/vernier")
diff --git a/ext/vernier/vernier.cc b/ext/vernier/vernier.cc
index 9a399e2..c386425 100644
--- a/ext/vernier/vernier.cc
+++ b/ext/vernier/vernier.cc
@@ -1367,6 +1367,13 @@ class TimeCollector : public BaseCollector {
     }
 
     static void *sample_thread_entry(void *arg) {
+#if HAVE_PTHREAD_SETNAME_NP
+#ifdef __APPLE__
+        pthread_setname_np("Vernier profiler");
+#else
+        pthread_setname_np(pthread_self(), "Vernier profiler");
+#endif
+#endif
         TimeCollector *collector = static_cast<TimeCollector *>(arg);
         collector->sample_thread_run();
         return NULL;