From 28e7487bf97aec493c059d2b6aa01325831f676e Mon Sep 17 00:00:00 2001
From: gaaclarke <30870216+gaaclarke@users.noreply.github.com>
Date: Wed, 20 Nov 2019 17:56:00 -0800
Subject: [PATCH] Made the thread checker print out the thread names on Apple
 platforms. (flutter/engine#13943)

---
 .../src/flutter/fml/memory/thread_checker.h   | 20 ++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/engine/src/flutter/fml/memory/thread_checker.h b/engine/src/flutter/fml/memory/thread_checker.h
index c6314ca6212..cd972955d30 100644
--- a/engine/src/flutter/fml/memory/thread_checker.h
+++ b/engine/src/flutter/fml/memory/thread_checker.h
@@ -47,7 +47,25 @@ class ThreadChecker final {
   // Returns true if the current thread is the thread this object was created
   // on and false otherwise.
   bool IsCreationThreadCurrent() const {
-    return !!pthread_equal(pthread_self(), self_);
+    pthread_t current_thread = pthread_self();
+    bool is_creation_thread_current = !!pthread_equal(current_thread, self_);
+#ifdef __APPLE__
+    // TODO(https://github.com/flutter/flutter/issues/45272): Implement for
+    // other platforms.
+    if (!is_creation_thread_current) {
+      static const int buffer_length = 128;
+      char expected_thread[buffer_length];
+      char actual_thread[buffer_length];
+      if (0 == pthread_getname_np(current_thread, actual_thread,
+                                  buffer_length) &&
+          0 == pthread_getname_np(self_, actual_thread, buffer_length)) {
+        FML_DLOG(ERROR) << "IsCreationThreadCurrent expected thread: '"
+                        << expected_thread << "' actual thread:'"
+                        << actual_thread << "'";
+      }
+    }
+#endif  // __APPLE__
+    return is_creation_thread_current;
   }
 
  private: