[Beignet] [PATCH] GBE: fix printf class static variable bug

[Pan Xiuli]

The PrintfParse::printfs static is not thread
safe and maybe reset or adding something wrong
when runing in mutlithread. Fix the problem by
change the printfs to a thread local variable.

Signed-off-by: Pan Xiuli <xiuli.pan at intel.com>
---
 backend/src/llvm/llvm_printf_parser.cpp | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/backend/src/llvm/llvm_printf_parser.cpp b/backend/src/llvm/llvm_printf_parser.cpp
index bdaed8a..93f87ea 100644
--- a/backend/src/llvm/llvm_printf_parser.cpp
+++ b/backend/src/llvm/llvm_printf_parser.cpp
@@ -45,6 +45,8 @@ namespace gbe
 {
   using namespace ir;
 
+  thread_local map<CallInst*, PrintfSet::PrintfFmt*> printfs;
+
   /* Return the conversion_specifier if succeed, -1 if failed. */
   static char __parse_printf_state(char *begin, char *end, char** rend, PrintfState * state)
   {
@@ -301,7 +303,6 @@ error:
     Value* g1Xg2Xg3;
     Value* wg_offset;
     int out_buf_sizeof_offset;
-    static map<CallInst*, PrintfSet::PrintfFmt*> printfs;
     int printf_num;
     int totalSizeofSize;
 
@@ -972,12 +973,10 @@ error:
     return false;
   }
 
-  map<CallInst*, PrintfSet::PrintfFmt*> PrintfParser::printfs;
-
   void* getPrintfInfo(CallInst* inst)
   {
-    if (PrintfParser::printfs[inst])
-      return (void*)PrintfParser::printfs[inst];
+    if (printfs[inst])
+      return (void*)printfs[inst];
     return NULL;
   }
 
-- 
2.1.4