From cdc943532d8f81843e18995f317f1e906c55e370 Mon Sep 17 00:00:00 2001
From: Owen Anderson <resistor@mac.com>
Date: Fri, 15 May 2009 08:22:07 +0000
Subject: [PATCH] Factor out some common code, fix more typoes, and add a
 memory fence that might be needed.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71853 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/Support/ManagedStatic.h | 46 ++++++++++++------------------------
 1 file changed, 15 insertions(+), 31 deletions(-)

diff --git a/include/llvm/Support/ManagedStatic.h b/include/llvm/Support/ManagedStatic.h
index c1ff0fef93..a504be31d8 100644
--- a/include/llvm/Support/ManagedStatic.h
+++ b/include/llvm/Support/ManagedStatic.h
@@ -51,51 +51,35 @@ public:
 ///
 template<class C>
 class ManagedStatic : public ManagedStaticBase {
-public:
-
-  // Accessors.
-  C &operator*() {
+private:
+  void checkInit() {
     sys::cas_flag OldFlag = sys::CompareAndSwap(&InitFlag, 1, 0);
     if (OldFlag == 0) {
       LazyInit();
       sys::MemoryFence();
       InitFlag = 2;
-    } else if (OldFlag == 1)
-      while (OldFlag == 1) ;
-      
+    } else if (OldFlag == 1) {
+      while (InitFlag == 1) ;
+      sys::MemoryFence();
+    }
+  }
+public:
+
+  // Accessors.
+  C &operator*() {
+    checkInit();
     return *static_cast<C*>(Ptr);
   }
   C *operator->() {
-    sys::cas_flag OldFlag = sys::CompareAndSwap(&InitFlag, 1, 0);
-    if (OldFlag == 0) {
-      LazyInit();
-      sys::MemoryFence();
-      InitFlag = 2;
-    } else if (OldFlag == 1)
-      while (OldFlag == 1) ;
-    
+    checkInit();
     return static_cast<C*>(Ptr);
   }
   const C &operator*() const {
-    sys::cas_flag OldFlag = sys::CompareAndSwap(&InitFlag, 1, 0);
-    if (OldFlag == 0) {
-      LazyInit();
-      sys::MemoryFence();
-      InitFlag = 2;
-    } else if (OldFlag == 1)
-      while (InitFlag == 1) ;
-    
+    checkInit();
     return *static_cast<C*>(Ptr);
   }
   const C *operator->() const {
-    sys::cas_flag OldFlag = sys::CompareAndSwap(&InitFlag, 1, 0);
-    if (OldFlag == 0) {
-      LazyInit();
-      sys::MemoryFence();
-      InitFlag = 2;
-    } else if (OldFlag == 1)
-      while (OldFlag == 1) ;
-    
+    checkInit();
     return static_cast<C*>(Ptr);
   }
 
-- 
2.11.4.GIT