pathops debug globals use atomic increment

src/pathops/SkOpContour.h

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #ifndef SkOpContour_DEFINED
 #define SkOpContour_DEFINED
 
 #include "SkOpSegment.h"
 #include "SkTArray.h"
 
+#if defined(SK_DEBUG) || !FORCE_RELEASE
+#include "SkThread.h"
+#endif
+
 class SkIntersections;
 class SkOpContour;
 class SkPathWriter;
 
 struct SkCoincidence {
     SkOpContour* fOther;
     int fSegments[2];
     double fTs[2][2];
     SkPoint fPts[2];
 };
 
 class SkOpContour {
 public:
     SkOpContour() {
         reset();
 #if defined(SK_DEBUG) || !FORCE_RELEASE
-        fID = ++SkPathOpsDebug::gContourID;
+        fID = sk_atomic_inc(&SkPathOpsDebug::gContourID);
 #endif
     }
 
     bool operator<(const SkOpContour& rh) const {
         return fBounds.fTop == rh.fBounds.fTop
                 ? fBounds.fLeft < rh.fBounds.fLeft
                 : fBounds.fTop < rh.fBounds.fTop;
     }
 
     bool addCoincident(int index, SkOpContour* other, int otherIndex,
@@ skipping 264 matching lines @@
     bool fOppXor;
 #if defined(SK_DEBUG) || !FORCE_RELEASE
     int debugID() const { return fID; }
     int fID;
 #else
     int debugID() const { return -1; }
 #endif
 };
 
 #endif