[libclang] Introduce options to control the priority for the threads

that libclang creates.

-Introduce CXGlobalOptFlags enum for the new options that can be
 set on the CXIndex object.

-CXGlobalOpt_ThreadBackgroundPriorityForIndexing affects:
  clang_indexSourceFile
  clang_indexTranslationUnit
  clang_parseTranslationUnit
  clang_saveTranslationUnit

-CXGlobalOpt_ThreadBackgroundPriorityForEditing affects:
  clang_reparseTranslationUnit
  clang_codeCompleteAt
  clang_annotateTokens

rdar://9075282

llvm-svn: 153562

1 files changed, 4 insertions, 0 deletions

diff --git a/clang/tools/libclang/CIndexCodeCompletion.cpp b/clang/tools/libclang/CIndexCodeCompletion.cpp
index 1b4a7e48000..c5bc8c8dd4d 100644
--- a/clang/tools/libclang/CIndexCodeCompletion.cpp
+++ b/clang/tools/libclang/CIndexCodeCompletion.cpp
@@ -666,6 +666,10 @@ void clang_codeCompleteAt_Impl(void *UserData) {
   if (!AST)
     return;
 
+  CIndexer *CXXIdx = (CIndexer*)TU->CIdx;
+  if (CXXIdx->isOptEnabled(CXGlobalOpt_ThreadBackgroundPriorityForEditing))
+    setBackGroundPriority();
+
   ASTUnit::ConcurrencyCheck Check(*AST);
 
   // Perform the remapping of source files.