[clangd] Only reduce priority of a thread for indexing.

Summary:
We'll soon have tasks pending for reading shards from disk, we want
them to have normal priority. Because:
- They are not CPU intensive, mostly IO bound.
- Give a good coverage for the project at startup, therefore it is worth
  spending some cycles.
- We have only one task per whole CDB rather than one task per file.

Reviewers: ilya-biryukov

Subscribers: ioeric, MaskRay, jkorous, arphaman, jfb, cfe-commits

Differential Revision: https://reviews.llvm.org/D55315

llvm-svn: 349345

1 files changed, 2 insertions, 2 deletions

diff --git a/clang-tools-extra/clangd/Threading.cpp b/clang-tools-extra/clangd/Threading.cpp
index cfb5e02a3f3..abfe0f497ca 100644
--- a/clang-tools-extra/clangd/Threading.cpp
+++ b/clang-tools-extra/clangd/Threading.cpp
@@ -112,13 +112,13 @@ void wait(std::unique_lock<std::mutex> &Lock, std::condition_variable &CV,
 
 static std::atomic<bool> AvoidThreadStarvation = {false};
 
-void setThreadPriority(std::thread &T, ThreadPriority Priority) {
+void setCurrentThreadPriority(ThreadPriority Priority) {
   // Some *really* old glibcs are missing SCHED_IDLE.
 #if defined(__linux__) && defined(SCHED_IDLE)
   sched_param priority;
   priority.sched_priority = 0;
   pthread_setschedparam(
-      T.native_handle(),
+      pthread_self(),
       Priority == ThreadPriority::Low && !AvoidThreadStarvation ? SCHED_IDLE
                                                                 : SCHED_OTHER,
       &priority);