[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, 14 insertions, 1 deletions

diff --git a/clang/tools/libclang/CIndexer.h b/clang/tools/libclang/CIndexer.h
index de7cc88a2c6..f8cb8dc1feb 100644
--- a/clang/tools/libclang/CIndexer.h
+++ b/clang/tools/libclang/CIndexer.h
@@ -29,12 +29,14 @@ namespace clang {
 class CIndexer {
   bool OnlyLocalDecls;
   bool DisplayDiagnostics;
+  unsigned Options; // CXGlobalOptFlags.
 
   llvm::sys::Path ResourcesPath;
   std::string WorkingDir;
 
 public:
- CIndexer() : OnlyLocalDecls(false), DisplayDiagnostics(false) { }
+ CIndexer() : OnlyLocalDecls(false), DisplayDiagnostics(false),
+              Options(CXGlobalOpt_None) { }
   
   /// \brief Whether we only want to see "local" declarations (that did not
   /// come from a previous precompiled header). If false, we want to see all
@@ -47,6 +49,13 @@ public:
     DisplayDiagnostics = Display;
   }
 
+  unsigned getCXGlobalOptFlags() const { return Options; }
+  void setCXGlobalOptFlags(unsigned options) { Options = options; }
+
+  bool isOptEnabled(CXGlobalOptFlags opt) const {
+    return Options & ~unsigned(opt);
+  }
+
   /// \brief Get the path of the clang resource files.
   std::string getClangResourcesPath();
 
@@ -79,6 +88,10 @@ public:
   bool RunSafely(llvm::CrashRecoveryContext &CRC,
                  void (*Fn)(void*), void *UserData, unsigned Size = 0);
 
+  /// \brief Set the thread priority to background.
+  /// FIXME: Move to llvm/Support.
+  void setBackGroundPriority();
+
   /// \brief Print libclang's resource usage to standard error.
   void PrintLibclangResourceUsage(CXTranslationUnit TU);
 }