ilya-biryukov added inline comments.

================
Comment at: clangd/Threading.h:124
 };
-void setThreadPriority(std::thread &T, ThreadPriority Priority);
+// Sets scheduling priority for the calling thread.
+void setCurrentThreadPriority(ThreadPriority Priority);
----------------
The comment looks redundant now. Maybe remove it?


================
Comment at: clangd/index/Background.cpp:202
     std::lock_guard<std::mutex> Lock(QueueMu);
-    Queue.push_back(std::move(T));
+    if (Priority == ThreadPriority::Low) {
+      Queue.push_back(Bind(
----------------
Since we might be interested in scheduling higher-priority tasks first anyway 
(not in this patch, but still), maybe store a pair of `(Task, Priority)` in the 
queue and call `setCurrentThreadPriority` when actually running the task?


Repository:
  rCTE Clang Tools Extra

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D55315/new/

https://reviews.llvm.org/D55315



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