[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, 8 insertions, 1 deletions

diff --git a/clang/tools/libclang/Indexing.cpp b/clang/tools/libclang/Indexing.cpp
index 85b638530f1..905569dccd1 100644
--- a/clang/tools/libclang/Indexing.cpp
+++ b/clang/tools/libclang/Indexing.cpp
@@ -275,6 +275,9 @@ static void clang_indexSourceFile_Impl(void *UserData) {
 
   CIndexer *CXXIdx = static_cast<CIndexer *>(CIdx);
 
+  if (CXXIdx->isOptEnabled(CXGlobalOpt_ThreadBackgroundPriorityForIndexing))
+    setBackGroundPriority();
+
   CaptureDiagnosticConsumer *CaptureDiag = new CaptureDiagnosticConsumer();
 
   // Configure the diagnostics.
@@ -351,7 +354,7 @@ static void clang_indexSourceFile_Impl(void *UserData) {
 
   ASTUnit *Unit = ASTUnit::create(CInvok.getPtr(), Diags,
                                   /*CaptureDiagnostics=*/true);
-  OwningPtr<CXTUOwner> CXTU(new CXTUOwner(MakeCXTranslationUnit(Unit)));
+  OwningPtr<CXTUOwner> CXTU(new CXTUOwner(MakeCXTranslationUnit(CXXIdx, Unit)));
 
   // Recover resources if we crash before exiting this method.
   llvm::CrashRecoveryContextCleanupRegistrar<CXTUOwner>
@@ -502,6 +505,10 @@ static void clang_indexTranslationUnit_Impl(void *UserData) {
   if (!client_index_callbacks || index_callbacks_size == 0)
     return;
 
+  CIndexer *CXXIdx = (CIndexer*)TU->CIdx;
+  if (CXXIdx->isOptEnabled(CXGlobalOpt_ThreadBackgroundPriorityForIndexing))
+    setBackGroundPriority();
+
   IndexerCallbacks CB;
   memset(&CB, 0, sizeof(CB));
   unsigned ClientCBSize = index_callbacks_size < sizeof(CB)