diff --git a/rs/java/android/renderscript/Element.java b/rs/java/android/renderscript/Element.java
index 50226ac..9d2f750 100644
--- a/rs/java/android/renderscript/Element.java
+++ b/rs/java/android/renderscript/Element.java
@@ -311,8 +311,12 @@
      * @return Element
      */
     public static Element BOOLEAN(RenderScript rs) {
-        if(rs.mElement_BOOLEAN == null) {
-            rs.mElement_BOOLEAN = createUser(rs, DataType.BOOLEAN);
+        if (rs.mElement_BOOLEAN == null) {
+            synchronized (rs) {
+                if (rs.mElement_BOOLEAN == null) {
+                    rs.mElement_BOOLEAN = createUser(rs, DataType.BOOLEAN);
+                }
+            }
         }
         return rs.mElement_BOOLEAN;
     }
@@ -325,8 +329,12 @@
      * @return Element
      */
     public static Element U8(RenderScript rs) {
-        if(rs.mElement_U8 == null) {
-            rs.mElement_U8 = createUser(rs, DataType.UNSIGNED_8);
+        if (rs.mElement_U8 == null) {
+            synchronized (rs) {
+                if (rs.mElement_U8 == null) {
+                    rs.mElement_U8 = createUser(rs, DataType.UNSIGNED_8);
+                }
+            }
         }
         return rs.mElement_U8;
     }
@@ -339,436 +347,683 @@
      * @return Element
      */
     public static Element I8(RenderScript rs) {
-        if(rs.mElement_I8 == null) {
-            rs.mElement_I8 = createUser(rs, DataType.SIGNED_8);
+        if (rs.mElement_I8 == null) {
+            synchronized (rs) {
+                if (rs.mElement_I8 == null) {
+                    rs.mElement_I8 = createUser(rs, DataType.SIGNED_8);
+                }
+            }
         }
         return rs.mElement_I8;
     }
 
     public static Element U16(RenderScript rs) {
-        if(rs.mElement_U16 == null) {
-            rs.mElement_U16 = createUser(rs, DataType.UNSIGNED_16);
+        if (rs.mElement_U16 == null) {
+            synchronized (rs) {
+                if (rs.mElement_U16 == null) {
+                    rs.mElement_U16 = createUser(rs, DataType.UNSIGNED_16);
+                }
+            }
         }
         return rs.mElement_U16;
     }
 
     public static Element I16(RenderScript rs) {
-        if(rs.mElement_I16 == null) {
-            rs.mElement_I16 = createUser(rs, DataType.SIGNED_16);
+        if (rs.mElement_I16 == null) {
+            synchronized (rs) {
+                if (rs.mElement_I16 == null) {
+                    rs.mElement_I16 = createUser(rs, DataType.SIGNED_16);
+                }
+            }
         }
         return rs.mElement_I16;
     }
 
     public static Element U32(RenderScript rs) {
-        if(rs.mElement_U32 == null) {
-            rs.mElement_U32 = createUser(rs, DataType.UNSIGNED_32);
+        if (rs.mElement_U32 == null) {
+            synchronized (rs) {
+                if (rs.mElement_U32 == null) {
+                    rs.mElement_U32 = createUser(rs, DataType.UNSIGNED_32);
+                }
+            }
         }
         return rs.mElement_U32;
     }
 
     public static Element I32(RenderScript rs) {
-        if(rs.mElement_I32 == null) {
-            rs.mElement_I32 = createUser(rs, DataType.SIGNED_32);
+        if (rs.mElement_I32 == null) {
+            synchronized (rs) {
+                if (rs.mElement_I32 == null) {
+                    rs.mElement_I32 = createUser(rs, DataType.SIGNED_32);
+                }
+            }
         }
         return rs.mElement_I32;
     }
 
     public static Element U64(RenderScript rs) {
-        if(rs.mElement_U64 == null) {
-            rs.mElement_U64 = createUser(rs, DataType.UNSIGNED_64);
+        if (rs.mElement_U64 == null) {
+            synchronized (rs) {
+                if (rs.mElement_U64 == null) {
+                    rs.mElement_U64 = createUser(rs, DataType.UNSIGNED_64);
+                }
+            }
         }
         return rs.mElement_U64;
     }
 
     public static Element I64(RenderScript rs) {
-        if(rs.mElement_I64 == null) {
-            rs.mElement_I64 = createUser(rs, DataType.SIGNED_64);
+        if (rs.mElement_I64 == null) {
+            synchronized (rs) {
+                if (rs.mElement_I64 == null) {
+                    rs.mElement_I64 = createUser(rs, DataType.SIGNED_64);
+                }
+            }
         }
         return rs.mElement_I64;
     }
 
     public static Element F16(RenderScript rs) {
-        if(rs.mElement_F16 == null) {
-            rs.mElement_F16 = createUser(rs, DataType.FLOAT_16);
+        if (rs.mElement_F16 == null) {
+            synchronized (rs) {
+                if (rs.mElement_F16 == null) {
+                    rs.mElement_F16 = createUser(rs, DataType.FLOAT_16);
+                }
+            }
         }
         return rs.mElement_F16;
     }
 
     public static Element F32(RenderScript rs) {
-        if(rs.mElement_F32 == null) {
-            rs.mElement_F32 = createUser(rs, DataType.FLOAT_32);
+        if (rs.mElement_F32 == null) {
+            synchronized (rs) {
+                if (rs.mElement_F32 == null) {
+                    rs.mElement_F32 = createUser(rs, DataType.FLOAT_32);
+                }
+            }
         }
         return rs.mElement_F32;
     }
 
     public static Element F64(RenderScript rs) {
-        if(rs.mElement_F64 == null) {
-            rs.mElement_F64 = createUser(rs, DataType.FLOAT_64);
+        if (rs.mElement_F64 == null) {
+            synchronized (rs) {
+                if (rs.mElement_F64 == null) {
+                    rs.mElement_F64 = createUser(rs, DataType.FLOAT_64);
+                }
+            }
         }
         return rs.mElement_F64;
     }
 
     public static Element ELEMENT(RenderScript rs) {
-        if(rs.mElement_ELEMENT == null) {
-            rs.mElement_ELEMENT = createUser(rs, DataType.RS_ELEMENT);
+        if (rs.mElement_ELEMENT == null) {
+            synchronized (rs) {
+                if (rs.mElement_ELEMENT == null) {
+                    rs.mElement_ELEMENT = createUser(rs, DataType.RS_ELEMENT);
+                }
+            }
         }
         return rs.mElement_ELEMENT;
     }
 
     public static Element TYPE(RenderScript rs) {
-        if(rs.mElement_TYPE == null) {
-            rs.mElement_TYPE = createUser(rs, DataType.RS_TYPE);
+        if (rs.mElement_TYPE == null) {
+            synchronized (rs) {
+                if (rs.mElement_TYPE == null) {
+                    rs.mElement_TYPE = createUser(rs, DataType.RS_TYPE);
+                }
+            }
         }
         return rs.mElement_TYPE;
     }
 
     public static Element ALLOCATION(RenderScript rs) {
-        if(rs.mElement_ALLOCATION == null) {
-            rs.mElement_ALLOCATION = createUser(rs, DataType.RS_ALLOCATION);
+        if (rs.mElement_ALLOCATION == null) {
+            synchronized (rs) {
+                if (rs.mElement_ALLOCATION == null) {
+                    rs.mElement_ALLOCATION = createUser(rs, DataType.RS_ALLOCATION);
+                }
+            }
         }
         return rs.mElement_ALLOCATION;
     }
 
     public static Element SAMPLER(RenderScript rs) {
-        if(rs.mElement_SAMPLER == null) {
-            rs.mElement_SAMPLER = createUser(rs, DataType.RS_SAMPLER);
+        if (rs.mElement_SAMPLER == null) {
+            synchronized (rs) {
+                if (rs.mElement_SAMPLER == null) {
+                    rs.mElement_SAMPLER = createUser(rs, DataType.RS_SAMPLER);
+                }
+            }
         }
         return rs.mElement_SAMPLER;
     }
 
     public static Element SCRIPT(RenderScript rs) {
-        if(rs.mElement_SCRIPT == null) {
-            rs.mElement_SCRIPT = createUser(rs, DataType.RS_SCRIPT);
+        if (rs.mElement_SCRIPT == null) {
+            synchronized (rs) {
+                if (rs.mElement_SCRIPT == null) {
+                    rs.mElement_SCRIPT = createUser(rs, DataType.RS_SCRIPT);
+                }
+            }
         }
         return rs.mElement_SCRIPT;
     }
 
     public static Element MESH(RenderScript rs) {
-        if(rs.mElement_MESH == null) {
-            rs.mElement_MESH = createUser(rs, DataType.RS_MESH);
+        if (rs.mElement_MESH == null) {
+            synchronized (rs) {
+                if (rs.mElement_MESH == null) {
+                    rs.mElement_MESH = createUser(rs, DataType.RS_MESH);
+                }
+            }
         }
         return rs.mElement_MESH;
     }
 
     public static Element PROGRAM_FRAGMENT(RenderScript rs) {
-        if(rs.mElement_PROGRAM_FRAGMENT == null) {
-            rs.mElement_PROGRAM_FRAGMENT = createUser(rs, DataType.RS_PROGRAM_FRAGMENT);
+        if (rs.mElement_PROGRAM_FRAGMENT == null) {
+            synchronized (rs) {
+                if (rs.mElement_PROGRAM_FRAGMENT == null) {
+                    rs.mElement_PROGRAM_FRAGMENT = createUser(rs, DataType.RS_PROGRAM_FRAGMENT);
+                }
+            }
         }
         return rs.mElement_PROGRAM_FRAGMENT;
     }
 
     public static Element PROGRAM_VERTEX(RenderScript rs) {
-        if(rs.mElement_PROGRAM_VERTEX == null) {
-            rs.mElement_PROGRAM_VERTEX = createUser(rs, DataType.RS_PROGRAM_VERTEX);
+        if (rs.mElement_PROGRAM_VERTEX == null) {
+            synchronized (rs) {
+                if (rs.mElement_PROGRAM_VERTEX == null) {
+                    rs.mElement_PROGRAM_VERTEX = createUser(rs, DataType.RS_PROGRAM_VERTEX);
+                }
+            }
         }
         return rs.mElement_PROGRAM_VERTEX;
     }
 
     public static Element PROGRAM_RASTER(RenderScript rs) {
-        if(rs.mElement_PROGRAM_RASTER == null) {
-            rs.mElement_PROGRAM_RASTER = createUser(rs, DataType.RS_PROGRAM_RASTER);
+        if (rs.mElement_PROGRAM_RASTER == null) {
+            synchronized (rs) {
+                if (rs.mElement_PROGRAM_RASTER == null) {
+                    rs.mElement_PROGRAM_RASTER = createUser(rs, DataType.RS_PROGRAM_RASTER);
+                }
+            }
         }
         return rs.mElement_PROGRAM_RASTER;
     }
 
     public static Element PROGRAM_STORE(RenderScript rs) {
-        if(rs.mElement_PROGRAM_STORE == null) {
-            rs.mElement_PROGRAM_STORE = createUser(rs, DataType.RS_PROGRAM_STORE);
+        if (rs.mElement_PROGRAM_STORE == null) {
+            synchronized (rs) {
+                if (rs.mElement_PROGRAM_STORE == null) {
+                    rs.mElement_PROGRAM_STORE = createUser(rs, DataType.RS_PROGRAM_STORE);
+                }
+            }
         }
         return rs.mElement_PROGRAM_STORE;
     }
 
     public static Element FONT(RenderScript rs) {
-        if(rs.mElement_FONT == null) {
-            rs.mElement_FONT = createUser(rs, DataType.RS_FONT);
+        if (rs.mElement_FONT == null) {
+            synchronized (rs) {
+                if (rs.mElement_FONT == null) {
+                    rs.mElement_FONT = createUser(rs, DataType.RS_FONT);
+                }
+            }
         }
         return rs.mElement_FONT;
     }
 
-
     public static Element A_8(RenderScript rs) {
-        if(rs.mElement_A_8 == null) {
-            rs.mElement_A_8 = createPixel(rs, DataType.UNSIGNED_8, DataKind.PIXEL_A);
+        if (rs.mElement_A_8 == null) {
+            synchronized (rs) {
+                if (rs.mElement_A_8 == null) {
+                    rs.mElement_A_8 = createPixel(rs, DataType.UNSIGNED_8, DataKind.PIXEL_A);
+                }
+            }
         }
         return rs.mElement_A_8;
     }
 
     public static Element RGB_565(RenderScript rs) {
-        if(rs.mElement_RGB_565 == null) {
-            rs.mElement_RGB_565 = createPixel(rs, DataType.UNSIGNED_5_6_5, DataKind.PIXEL_RGB);
+        if (rs.mElement_RGB_565 == null) {
+            synchronized (rs) {
+                if (rs.mElement_RGB_565 == null) {
+                    rs.mElement_RGB_565 = createPixel(rs, DataType.UNSIGNED_5_6_5, DataKind.PIXEL_RGB);
+                }
+            }
         }
         return rs.mElement_RGB_565;
     }
 
     public static Element RGB_888(RenderScript rs) {
-        if(rs.mElement_RGB_888 == null) {
-            rs.mElement_RGB_888 = createPixel(rs, DataType.UNSIGNED_8, DataKind.PIXEL_RGB);
+        if (rs.mElement_RGB_888 == null) {
+            synchronized (rs) {
+                if (rs.mElement_RGB_888 == null) {
+                    rs.mElement_RGB_888 = createPixel(rs, DataType.UNSIGNED_8, DataKind.PIXEL_RGB);
+                }
+            }
         }
         return rs.mElement_RGB_888;
     }
 
     public static Element RGBA_5551(RenderScript rs) {
-        if(rs.mElement_RGBA_5551 == null) {
-            rs.mElement_RGBA_5551 = createPixel(rs, DataType.UNSIGNED_5_5_5_1, DataKind.PIXEL_RGBA);
+        if (rs.mElement_RGBA_5551 == null) {
+            synchronized (rs) {
+                if (rs.mElement_RGBA_5551 == null) {
+                    rs.mElement_RGBA_5551 = createPixel(rs, DataType.UNSIGNED_5_5_5_1, DataKind.PIXEL_RGBA);
+                }
+            }
         }
         return rs.mElement_RGBA_5551;
     }
 
     public static Element RGBA_4444(RenderScript rs) {
-        if(rs.mElement_RGBA_4444 == null) {
-            rs.mElement_RGBA_4444 = createPixel(rs, DataType.UNSIGNED_4_4_4_4, DataKind.PIXEL_RGBA);
+        if (rs.mElement_RGBA_4444 == null) {
+            synchronized (rs) {
+                if (rs.mElement_RGBA_4444 == null) {
+                    rs.mElement_RGBA_4444 = createPixel(rs, DataType.UNSIGNED_4_4_4_4, DataKind.PIXEL_RGBA);
+                }
+            }
         }
         return rs.mElement_RGBA_4444;
     }
 
     public static Element RGBA_8888(RenderScript rs) {
-        if(rs.mElement_RGBA_8888 == null) {
-            rs.mElement_RGBA_8888 = createPixel(rs, DataType.UNSIGNED_8, DataKind.PIXEL_RGBA);
+        if (rs.mElement_RGBA_8888 == null) {
+            synchronized (rs) {
+                if (rs.mElement_RGBA_8888 == null) {
+                    rs.mElement_RGBA_8888 = createPixel(rs, DataType.UNSIGNED_8, DataKind.PIXEL_RGBA);
+                }
+            }
         }
         return rs.mElement_RGBA_8888;
     }
 
     public static Element F16_2(RenderScript rs) {
-        if(rs.mElement_HALF_2 == null) {
-            rs.mElement_HALF_2 = createVector(rs, DataType.FLOAT_16, 2);
+        if (rs.mElement_HALF_2 == null) {
+            synchronized (rs) {
+                if (rs.mElement_HALF_2 == null) {
+                    rs.mElement_HALF_2 = createVector(rs, DataType.FLOAT_16, 2);
+                }
+            }
         }
         return rs.mElement_HALF_2;
     }
 
     public static Element F16_3(RenderScript rs) {
-        if(rs.mElement_HALF_3 == null) {
-            rs.mElement_HALF_3 = createVector(rs, DataType.FLOAT_16, 3);
+        if (rs.mElement_HALF_3 == null) {
+            synchronized (rs) {
+                if (rs.mElement_HALF_3 == null) {
+                    rs.mElement_HALF_3 = createVector(rs, DataType.FLOAT_16, 3);
+                }
+            }
         }
         return rs.mElement_HALF_3;
     }
 
     public static Element F16_4(RenderScript rs) {
-        if(rs.mElement_HALF_4 == null) {
-            rs.mElement_HALF_4 = createVector(rs, DataType.FLOAT_16, 4);
+        if (rs.mElement_HALF_4 == null) {
+            synchronized (rs) {
+                if (rs.mElement_HALF_4 == null) {
+                    rs.mElement_HALF_4 = createVector(rs, DataType.FLOAT_16, 4);
+                }
+            }
         }
         return rs.mElement_HALF_4;
     }
 
     public static Element F32_2(RenderScript rs) {
-        if(rs.mElement_FLOAT_2 == null) {
-            rs.mElement_FLOAT_2 = createVector(rs, DataType.FLOAT_32, 2);
+        if (rs.mElement_FLOAT_2 == null) {
+            synchronized (rs) {
+                if (rs.mElement_FLOAT_2 == null) {
+                    rs.mElement_FLOAT_2 = createVector(rs, DataType.FLOAT_32, 2);
+                }
+            }
         }
         return rs.mElement_FLOAT_2;
     }
 
     public static Element F32_3(RenderScript rs) {
-        if(rs.mElement_FLOAT_3 == null) {
-            rs.mElement_FLOAT_3 = createVector(rs, DataType.FLOAT_32, 3);
+        if (rs.mElement_FLOAT_3 == null) {
+            synchronized (rs) {
+                if (rs.mElement_FLOAT_3 == null) {
+                    rs.mElement_FLOAT_3 = createVector(rs, DataType.FLOAT_32, 3);
+                }
+            }
         }
         return rs.mElement_FLOAT_3;
     }
 
     public static Element F32_4(RenderScript rs) {
-        if(rs.mElement_FLOAT_4 == null) {
-            rs.mElement_FLOAT_4 = createVector(rs, DataType.FLOAT_32, 4);
+        if (rs.mElement_FLOAT_4 == null) {
+            synchronized (rs) {
+                if (rs.mElement_FLOAT_4 == null) {
+                    rs.mElement_FLOAT_4 = createVector(rs, DataType.FLOAT_32, 4);
+                }
+            }
         }
         return rs.mElement_FLOAT_4;
     }
 
     public static Element F64_2(RenderScript rs) {
-        if(rs.mElement_DOUBLE_2 == null) {
-            rs.mElement_DOUBLE_2 = createVector(rs, DataType.FLOAT_64, 2);
+        if (rs.mElement_DOUBLE_2 == null) {
+            synchronized (rs) {
+                if (rs.mElement_DOUBLE_2 == null) {
+                    rs.mElement_DOUBLE_2 = createVector(rs, DataType.FLOAT_64, 2);
+                }
+            }
         }
         return rs.mElement_DOUBLE_2;
     }
 
     public static Element F64_3(RenderScript rs) {
-        if(rs.mElement_DOUBLE_3 == null) {
-            rs.mElement_DOUBLE_3 = createVector(rs, DataType.FLOAT_64, 3);
+        if (rs.mElement_DOUBLE_3 == null) {
+            synchronized (rs) {
+                if (rs.mElement_DOUBLE_3 == null) {
+                    rs.mElement_DOUBLE_3 = createVector(rs, DataType.FLOAT_64, 3);
+                }
+            }
         }
         return rs.mElement_DOUBLE_3;
     }
 
     public static Element F64_4(RenderScript rs) {
-        if(rs.mElement_DOUBLE_4 == null) {
-            rs.mElement_DOUBLE_4 = createVector(rs, DataType.FLOAT_64, 4);
+        if (rs.mElement_DOUBLE_4 == null) {
+            synchronized (rs) {
+                if (rs.mElement_DOUBLE_4 == null) {
+                    rs.mElement_DOUBLE_4 = createVector(rs, DataType.FLOAT_64, 4);
+                }
+            }
         }
         return rs.mElement_DOUBLE_4;
     }
 
     public static Element U8_2(RenderScript rs) {
-        if(rs.mElement_UCHAR_2 == null) {
-            rs.mElement_UCHAR_2 = createVector(rs, DataType.UNSIGNED_8, 2);
+        if (rs.mElement_UCHAR_2 == null) {
+            synchronized (rs) {
+                if (rs.mElement_UCHAR_2 == null) {
+                    rs.mElement_UCHAR_2 = createVector(rs, DataType.UNSIGNED_8, 2);
+                }
+            }
         }
         return rs.mElement_UCHAR_2;
     }
 
     public static Element U8_3(RenderScript rs) {
-        if(rs.mElement_UCHAR_3 == null) {
-            rs.mElement_UCHAR_3 = createVector(rs, DataType.UNSIGNED_8, 3);
+        if (rs.mElement_UCHAR_3 == null) {
+            synchronized (rs) {
+                if (rs.mElement_UCHAR_3 == null) {
+                    rs.mElement_UCHAR_3 = createVector(rs, DataType.UNSIGNED_8, 3);
+                }
+            }
         }
         return rs.mElement_UCHAR_3;
     }
 
     public static Element U8_4(RenderScript rs) {
-        if(rs.mElement_UCHAR_4 == null) {
-            rs.mElement_UCHAR_4 = createVector(rs, DataType.UNSIGNED_8, 4);
+        if (rs.mElement_UCHAR_4 == null) {
+            synchronized (rs) {
+                if (rs.mElement_UCHAR_4 == null) {
+                    rs.mElement_UCHAR_4 = createVector(rs, DataType.UNSIGNED_8, 4);
+                }
+            }
         }
         return rs.mElement_UCHAR_4;
     }
 
     public static Element I8_2(RenderScript rs) {
-        if(rs.mElement_CHAR_2 == null) {
-            rs.mElement_CHAR_2 = createVector(rs, DataType.SIGNED_8, 2);
+        if (rs.mElement_CHAR_2 == null) {
+            synchronized (rs) {
+                if (rs.mElement_CHAR_2 == null) {
+                    rs.mElement_CHAR_2 = createVector(rs, DataType.SIGNED_8, 2);
+                }
+            }
         }
         return rs.mElement_CHAR_2;
     }
 
     public static Element I8_3(RenderScript rs) {
-        if(rs.mElement_CHAR_3 == null) {
-            rs.mElement_CHAR_3 = createVector(rs, DataType.SIGNED_8, 3);
+        if (rs.mElement_CHAR_3 == null) {
+            synchronized (rs) {
+                if (rs.mElement_CHAR_3 == null) {
+                    rs.mElement_CHAR_3 = createVector(rs, DataType.SIGNED_8, 3);
+                }
+            }
         }
         return rs.mElement_CHAR_3;
     }
 
     public static Element I8_4(RenderScript rs) {
-        if(rs.mElement_CHAR_4 == null) {
-            rs.mElement_CHAR_4 = createVector(rs, DataType.SIGNED_8, 4);
+        if (rs.mElement_CHAR_4 == null) {
+            synchronized (rs) {
+                if (rs.mElement_CHAR_4 == null) {
+                    rs.mElement_CHAR_4 = createVector(rs, DataType.SIGNED_8, 4);
+                }
+            }
         }
         return rs.mElement_CHAR_4;
     }
 
     public static Element U16_2(RenderScript rs) {
-        if(rs.mElement_USHORT_2 == null) {
-            rs.mElement_USHORT_2 = createVector(rs, DataType.UNSIGNED_16, 2);
+        if (rs.mElement_USHORT_2 == null) {
+            synchronized (rs) {
+                if (rs.mElement_USHORT_2 == null) {
+                    rs.mElement_USHORT_2 = createVector(rs, DataType.UNSIGNED_16, 2);
+                }
+            }
         }
         return rs.mElement_USHORT_2;
     }
 
     public static Element U16_3(RenderScript rs) {
-        if(rs.mElement_USHORT_3 == null) {
-            rs.mElement_USHORT_3 = createVector(rs, DataType.UNSIGNED_16, 3);
+        if (rs.mElement_USHORT_3 == null) {
+            synchronized (rs) {
+                if (rs.mElement_USHORT_3 == null) {
+                    rs.mElement_USHORT_3 = createVector(rs, DataType.UNSIGNED_16, 3);
+                }
+            }
         }
         return rs.mElement_USHORT_3;
     }
 
     public static Element U16_4(RenderScript rs) {
-        if(rs.mElement_USHORT_4 == null) {
-            rs.mElement_USHORT_4 = createVector(rs, DataType.UNSIGNED_16, 4);
+        if (rs.mElement_USHORT_4 == null) {
+            synchronized (rs) {
+                if (rs.mElement_USHORT_4 == null) {
+                    rs.mElement_USHORT_4 = createVector(rs, DataType.UNSIGNED_16, 4);
+                }
+            }
         }
         return rs.mElement_USHORT_4;
     }
 
     public static Element I16_2(RenderScript rs) {
-        if(rs.mElement_SHORT_2 == null) {
-            rs.mElement_SHORT_2 = createVector(rs, DataType.SIGNED_16, 2);
+        if (rs.mElement_SHORT_2 == null) {
+            synchronized (rs) {
+                if (rs.mElement_SHORT_2 == null) {
+                    rs.mElement_SHORT_2 = createVector(rs, DataType.SIGNED_16, 2);
+                }
+            }
         }
         return rs.mElement_SHORT_2;
     }
 
     public static Element I16_3(RenderScript rs) {
-        if(rs.mElement_SHORT_3 == null) {
-            rs.mElement_SHORT_3 = createVector(rs, DataType.SIGNED_16, 3);
+        if (rs.mElement_SHORT_3 == null) {
+            synchronized (rs) {
+                if (rs.mElement_SHORT_3 == null) {
+                    rs.mElement_SHORT_3 = createVector(rs, DataType.SIGNED_16, 3);
+                }
+            }
         }
         return rs.mElement_SHORT_3;
     }
 
     public static Element I16_4(RenderScript rs) {
-        if(rs.mElement_SHORT_4 == null) {
-            rs.mElement_SHORT_4 = createVector(rs, DataType.SIGNED_16, 4);
+        if (rs.mElement_SHORT_4 == null) {
+            synchronized (rs) {
+                if (rs.mElement_SHORT_4 == null) {
+                    rs.mElement_SHORT_4 = createVector(rs, DataType.SIGNED_16, 4);
+                }
+            }
         }
         return rs.mElement_SHORT_4;
     }
 
     public static Element U32_2(RenderScript rs) {
-        if(rs.mElement_UINT_2 == null) {
-            rs.mElement_UINT_2 = createVector(rs, DataType.UNSIGNED_32, 2);
+        if (rs.mElement_UINT_2 == null) {
+            synchronized (rs) {
+                if (rs.mElement_UINT_2 == null) {
+                    rs.mElement_UINT_2 = createVector(rs, DataType.UNSIGNED_32, 2);
+                }
+            }
         }
         return rs.mElement_UINT_2;
     }
 
     public static Element U32_3(RenderScript rs) {
-        if(rs.mElement_UINT_3 == null) {
-            rs.mElement_UINT_3 = createVector(rs, DataType.UNSIGNED_32, 3);
+        if (rs.mElement_UINT_3 == null) {
+            synchronized (rs) {
+                if (rs.mElement_UINT_3 == null) {
+                    rs.mElement_UINT_3 = createVector(rs, DataType.UNSIGNED_32, 3);
+                }
+            }
         }
         return rs.mElement_UINT_3;
     }
 
     public static Element U32_4(RenderScript rs) {
-        if(rs.mElement_UINT_4 == null) {
-            rs.mElement_UINT_4 = createVector(rs, DataType.UNSIGNED_32, 4);
+        if (rs.mElement_UINT_4 == null) {
+            synchronized (rs) {
+                if (rs.mElement_UINT_4 == null) {
+                    rs.mElement_UINT_4 = createVector(rs, DataType.UNSIGNED_32, 4);
+                }
+            }
         }
         return rs.mElement_UINT_4;
     }
 
     public static Element I32_2(RenderScript rs) {
-        if(rs.mElement_INT_2 == null) {
-            rs.mElement_INT_2 = createVector(rs, DataType.SIGNED_32, 2);
+        if (rs.mElement_INT_2 == null) {
+            synchronized (rs) {
+                if (rs.mElement_INT_2 == null) {
+                    rs.mElement_INT_2 = createVector(rs, DataType.SIGNED_32, 2);
+                }
+            }
         }
         return rs.mElement_INT_2;
     }
 
     public static Element I32_3(RenderScript rs) {
-        if(rs.mElement_INT_3 == null) {
-            rs.mElement_INT_3 = createVector(rs, DataType.SIGNED_32, 3);
+        if (rs.mElement_INT_3 == null) {
+            synchronized (rs) {
+                if (rs.mElement_INT_3 == null) {
+                    rs.mElement_INT_3 = createVector(rs, DataType.SIGNED_32, 3);
+                }
+            }
         }
         return rs.mElement_INT_3;
     }
 
     public static Element I32_4(RenderScript rs) {
-        if(rs.mElement_INT_4 == null) {
-            rs.mElement_INT_4 = createVector(rs, DataType.SIGNED_32, 4);
+        if (rs.mElement_INT_4 == null) {
+            synchronized (rs) {
+                if (rs.mElement_INT_4 == null) {
+                    rs.mElement_INT_4 = createVector(rs, DataType.SIGNED_32, 4);
+                }
+            }
         }
         return rs.mElement_INT_4;
     }
 
     public static Element U64_2(RenderScript rs) {
-        if(rs.mElement_ULONG_2 == null) {
-            rs.mElement_ULONG_2 = createVector(rs, DataType.UNSIGNED_64, 2);
+        if (rs.mElement_ULONG_2 == null) {
+            synchronized (rs) {
+                if (rs.mElement_ULONG_2 == null) {
+                    rs.mElement_ULONG_2 = createVector(rs, DataType.UNSIGNED_64, 2);
+                }
+            }
         }
         return rs.mElement_ULONG_2;
     }
 
     public static Element U64_3(RenderScript rs) {
-        if(rs.mElement_ULONG_3 == null) {
-            rs.mElement_ULONG_3 = createVector(rs, DataType.UNSIGNED_64, 3);
+        if (rs.mElement_ULONG_3 == null) {
+            synchronized (rs) {
+                if (rs.mElement_ULONG_3 == null) {
+                    rs.mElement_ULONG_3 = createVector(rs, DataType.UNSIGNED_64, 3);
+                }
+            }
         }
         return rs.mElement_ULONG_3;
     }
 
     public static Element U64_4(RenderScript rs) {
-        if(rs.mElement_ULONG_4 == null) {
-            rs.mElement_ULONG_4 = createVector(rs, DataType.UNSIGNED_64, 4);
+        if (rs.mElement_ULONG_4 == null) {
+            synchronized (rs) {
+                if (rs.mElement_ULONG_4 == null) {
+                    rs.mElement_ULONG_4 = createVector(rs, DataType.UNSIGNED_64, 4);
+                }
+            }
         }
         return rs.mElement_ULONG_4;
     }
 
     public static Element I64_2(RenderScript rs) {
-        if(rs.mElement_LONG_2 == null) {
-            rs.mElement_LONG_2 = createVector(rs, DataType.SIGNED_64, 2);
+        if (rs.mElement_LONG_2 == null) {
+            synchronized (rs) {
+                if (rs.mElement_LONG_2 == null) {
+                    rs.mElement_LONG_2 = createVector(rs, DataType.SIGNED_64, 2);
+                }
+            }
         }
         return rs.mElement_LONG_2;
     }
 
     public static Element I64_3(RenderScript rs) {
-        if(rs.mElement_LONG_3 == null) {
-            rs.mElement_LONG_3 = createVector(rs, DataType.SIGNED_64, 3);
+        if (rs.mElement_LONG_3 == null) {
+            synchronized (rs) {
+                if (rs.mElement_LONG_3 == null) {
+                    rs.mElement_LONG_3 = createVector(rs, DataType.SIGNED_64, 3);
+                }
+            }
         }
         return rs.mElement_LONG_3;
     }
 
     public static Element I64_4(RenderScript rs) {
-        if(rs.mElement_LONG_4 == null) {
-            rs.mElement_LONG_4 = createVector(rs, DataType.SIGNED_64, 4);
+        if (rs.mElement_LONG_4 == null) {
+            synchronized (rs) {
+                if (rs.mElement_LONG_4 == null) {
+                    rs.mElement_LONG_4 = createVector(rs, DataType.SIGNED_64, 4);
+                }
+            }
         }
         return rs.mElement_LONG_4;
     }
 
     public static Element YUV(RenderScript rs) {
         if (rs.mElement_YUV == null) {
-            rs.mElement_YUV = createPixel(rs, DataType.UNSIGNED_8, DataKind.PIXEL_YUV);
+            synchronized (rs) {
+                if (rs.mElement_YUV == null) {
+                    rs.mElement_YUV = createPixel(rs, DataType.UNSIGNED_8, DataKind.PIXEL_YUV);
+                }
+            }
         }
         return rs.mElement_YUV;
     }
 
     public static Element MATRIX_4X4(RenderScript rs) {
-        if(rs.mElement_MATRIX_4X4 == null) {
-            rs.mElement_MATRIX_4X4 = createUser(rs, DataType.MATRIX_4X4);
+        if (rs.mElement_MATRIX_4X4 == null) {
+            synchronized (rs) {
+                if (rs.mElement_MATRIX_4X4 == null) {
+                    rs.mElement_MATRIX_4X4 = createUser(rs, DataType.MATRIX_4X4);
+                }
+            }
         }
         return rs.mElement_MATRIX_4X4;
     }
@@ -780,15 +1035,23 @@
     }
 
     public static Element MATRIX_3X3(RenderScript rs) {
-        if(rs.mElement_MATRIX_3X3 == null) {
-            rs.mElement_MATRIX_3X3 = createUser(rs, DataType.MATRIX_3X3);
+        if (rs.mElement_MATRIX_3X3 == null) {
+            synchronized (rs) {
+                if (rs.mElement_MATRIX_3X3 == null) {
+                    rs.mElement_MATRIX_3X3 = createUser(rs, DataType.MATRIX_3X3);
+                }
+            }
         }
         return rs.mElement_MATRIX_3X3;
     }
 
     public static Element MATRIX_2X2(RenderScript rs) {
-        if(rs.mElement_MATRIX_2X2 == null) {
-            rs.mElement_MATRIX_2X2 = createUser(rs, DataType.MATRIX_2X2);
+        if (rs.mElement_MATRIX_2X2 == null) {
+            synchronized (rs) {
+                if (rs.mElement_MATRIX_2X2 == null) {
+                    rs.mElement_MATRIX_2X2 = createUser(rs, DataType.MATRIX_2X2);
+                }
+            }
         }
         return rs.mElement_MATRIX_2X2;
     }
diff --git a/rs/java/android/renderscript/RenderScript.java b/rs/java/android/renderscript/RenderScript.java
index 2650e5a..3d1370a 100644
--- a/rs/java/android/renderscript/RenderScript.java
+++ b/rs/java/android/renderscript/RenderScript.java
@@ -1037,97 +1037,97 @@
     @SuppressWarnings({"FieldCanBeLocal"})
     MessageThread mMessageThread;
 
-    Element mElement_U8;
-    Element mElement_I8;
-    Element mElement_U16;
-    Element mElement_I16;
-    Element mElement_U32;
-    Element mElement_I32;
-    Element mElement_U64;
-    Element mElement_I64;
-    Element mElement_F16;
-    Element mElement_F32;
-    Element mElement_F64;
-    Element mElement_BOOLEAN;
+    volatile Element mElement_U8;
+    volatile Element mElement_I8;
+    volatile Element mElement_U16;
+    volatile Element mElement_I16;
+    volatile Element mElement_U32;
+    volatile Element mElement_I32;
+    volatile Element mElement_U64;
+    volatile Element mElement_I64;
+    volatile Element mElement_F16;
+    volatile Element mElement_F32;
+    volatile Element mElement_F64;
+    volatile Element mElement_BOOLEAN;
 
-    Element mElement_ELEMENT;
-    Element mElement_TYPE;
-    Element mElement_ALLOCATION;
-    Element mElement_SAMPLER;
-    Element mElement_SCRIPT;
-    Element mElement_MESH;
-    Element mElement_PROGRAM_FRAGMENT;
-    Element mElement_PROGRAM_VERTEX;
-    Element mElement_PROGRAM_RASTER;
-    Element mElement_PROGRAM_STORE;
-    Element mElement_FONT;
+    volatile Element mElement_ELEMENT;
+    volatile Element mElement_TYPE;
+    volatile Element mElement_ALLOCATION;
+    volatile Element mElement_SAMPLER;
+    volatile Element mElement_SCRIPT;
+    volatile Element mElement_MESH;
+    volatile Element mElement_PROGRAM_FRAGMENT;
+    volatile Element mElement_PROGRAM_VERTEX;
+    volatile Element mElement_PROGRAM_RASTER;
+    volatile Element mElement_PROGRAM_STORE;
+    volatile Element mElement_FONT;
 
-    Element mElement_A_8;
-    Element mElement_RGB_565;
-    Element mElement_RGB_888;
-    Element mElement_RGBA_5551;
-    Element mElement_RGBA_4444;
-    Element mElement_RGBA_8888;
+    volatile Element mElement_A_8;
+    volatile Element mElement_RGB_565;
+    volatile Element mElement_RGB_888;
+    volatile Element mElement_RGBA_5551;
+    volatile Element mElement_RGBA_4444;
+    volatile Element mElement_RGBA_8888;
 
-    Element mElement_HALF_2;
-    Element mElement_HALF_3;
-    Element mElement_HALF_4;
+    volatile Element mElement_HALF_2;
+    volatile Element mElement_HALF_3;
+    volatile Element mElement_HALF_4;
 
-    Element mElement_FLOAT_2;
-    Element mElement_FLOAT_3;
-    Element mElement_FLOAT_4;
+    volatile Element mElement_FLOAT_2;
+    volatile Element mElement_FLOAT_3;
+    volatile Element mElement_FLOAT_4;
 
-    Element mElement_DOUBLE_2;
-    Element mElement_DOUBLE_3;
-    Element mElement_DOUBLE_4;
+    volatile Element mElement_DOUBLE_2;
+    volatile Element mElement_DOUBLE_3;
+    volatile Element mElement_DOUBLE_4;
 
-    Element mElement_UCHAR_2;
-    Element mElement_UCHAR_3;
-    Element mElement_UCHAR_4;
+    volatile Element mElement_UCHAR_2;
+    volatile Element mElement_UCHAR_3;
+    volatile Element mElement_UCHAR_4;
 
-    Element mElement_CHAR_2;
-    Element mElement_CHAR_3;
-    Element mElement_CHAR_4;
+    volatile Element mElement_CHAR_2;
+    volatile Element mElement_CHAR_3;
+    volatile Element mElement_CHAR_4;
 
-    Element mElement_USHORT_2;
-    Element mElement_USHORT_3;
-    Element mElement_USHORT_4;
+    volatile Element mElement_USHORT_2;
+    volatile Element mElement_USHORT_3;
+    volatile Element mElement_USHORT_4;
 
-    Element mElement_SHORT_2;
-    Element mElement_SHORT_3;
-    Element mElement_SHORT_4;
+    volatile Element mElement_SHORT_2;
+    volatile Element mElement_SHORT_3;
+    volatile Element mElement_SHORT_4;
 
-    Element mElement_UINT_2;
-    Element mElement_UINT_3;
-    Element mElement_UINT_4;
+    volatile Element mElement_UINT_2;
+    volatile Element mElement_UINT_3;
+    volatile Element mElement_UINT_4;
 
-    Element mElement_INT_2;
-    Element mElement_INT_3;
-    Element mElement_INT_4;
+    volatile Element mElement_INT_2;
+    volatile Element mElement_INT_3;
+    volatile Element mElement_INT_4;
 
-    Element mElement_ULONG_2;
-    Element mElement_ULONG_3;
-    Element mElement_ULONG_4;
+    volatile Element mElement_ULONG_2;
+    volatile Element mElement_ULONG_3;
+    volatile Element mElement_ULONG_4;
 
-    Element mElement_LONG_2;
-    Element mElement_LONG_3;
-    Element mElement_LONG_4;
+    volatile Element mElement_LONG_2;
+    volatile Element mElement_LONG_3;
+    volatile Element mElement_LONG_4;
 
-    Element mElement_YUV;
+    volatile Element mElement_YUV;
 
-    Element mElement_MATRIX_4X4;
-    Element mElement_MATRIX_3X3;
-    Element mElement_MATRIX_2X2;
+    volatile Element mElement_MATRIX_4X4;
+    volatile Element mElement_MATRIX_3X3;
+    volatile Element mElement_MATRIX_2X2;
 
-    Sampler mSampler_CLAMP_NEAREST;
-    Sampler mSampler_CLAMP_LINEAR;
-    Sampler mSampler_CLAMP_LINEAR_MIP_LINEAR;
-    Sampler mSampler_WRAP_NEAREST;
-    Sampler mSampler_WRAP_LINEAR;
-    Sampler mSampler_WRAP_LINEAR_MIP_LINEAR;
-    Sampler mSampler_MIRRORED_REPEAT_NEAREST;
-    Sampler mSampler_MIRRORED_REPEAT_LINEAR;
-    Sampler mSampler_MIRRORED_REPEAT_LINEAR_MIP_LINEAR;
+    volatile Sampler mSampler_CLAMP_NEAREST;
+    volatile Sampler mSampler_CLAMP_LINEAR;
+    volatile Sampler mSampler_CLAMP_LINEAR_MIP_LINEAR;
+    volatile Sampler mSampler_WRAP_NEAREST;
+    volatile Sampler mSampler_WRAP_LINEAR;
+    volatile Sampler mSampler_WRAP_LINEAR_MIP_LINEAR;
+    volatile Sampler mSampler_MIRRORED_REPEAT_NEAREST;
+    volatile Sampler mSampler_MIRRORED_REPEAT_LINEAR;
+    volatile Sampler mSampler_MIRRORED_REPEAT_LINEAR_MIP_LINEAR;
 
     ProgramStore mProgramStore_BLEND_NONE_DEPTH_TEST;
     ProgramStore mProgramStore_BLEND_NONE_DEPTH_NO_DEPTH;
diff --git a/rs/java/android/renderscript/Sampler.java b/rs/java/android/renderscript/Sampler.java
index 5c4bae9..70e88bc 100644
--- a/rs/java/android/renderscript/Sampler.java
+++ b/rs/java/android/renderscript/Sampler.java
@@ -98,13 +98,17 @@
      * @return Sampler
      */
     public static Sampler CLAMP_NEAREST(RenderScript rs) {
-        if(rs.mSampler_CLAMP_NEAREST == null) {
-            Builder b = new Builder(rs);
-            b.setMinification(Value.NEAREST);
-            b.setMagnification(Value.NEAREST);
-            b.setWrapS(Value.CLAMP);
-            b.setWrapT(Value.CLAMP);
-            rs.mSampler_CLAMP_NEAREST = b.create();
+        if (rs.mSampler_CLAMP_NEAREST == null) {
+            synchronized (rs) {
+                if (rs.mSampler_CLAMP_NEAREST == null) {
+                    Builder b = new Builder(rs);
+                    b.setMinification(Value.NEAREST);
+                    b.setMagnification(Value.NEAREST);
+                    b.setWrapS(Value.CLAMP);
+                    b.setWrapT(Value.CLAMP);
+                    rs.mSampler_CLAMP_NEAREST = b.create();
+                }
+            }
         }
         return rs.mSampler_CLAMP_NEAREST;
     }
@@ -118,13 +122,17 @@
      * @return Sampler
      */
     public static Sampler CLAMP_LINEAR(RenderScript rs) {
-        if(rs.mSampler_CLAMP_LINEAR == null) {
-            Builder b = new Builder(rs);
-            b.setMinification(Value.LINEAR);
-            b.setMagnification(Value.LINEAR);
-            b.setWrapS(Value.CLAMP);
-            b.setWrapT(Value.CLAMP);
-            rs.mSampler_CLAMP_LINEAR = b.create();
+        if (rs.mSampler_CLAMP_LINEAR == null) {
+            synchronized (rs) {
+                if (rs.mSampler_CLAMP_LINEAR == null) {
+                    Builder b = new Builder(rs);
+                    b.setMinification(Value.LINEAR);
+                    b.setMagnification(Value.LINEAR);
+                    b.setWrapS(Value.CLAMP);
+                    b.setWrapT(Value.CLAMP);
+                    rs.mSampler_CLAMP_LINEAR = b.create();
+                }
+            }
         }
         return rs.mSampler_CLAMP_LINEAR;
     }
@@ -138,13 +146,17 @@
      * @return Sampler
      */
     public static Sampler CLAMP_LINEAR_MIP_LINEAR(RenderScript rs) {
-        if(rs.mSampler_CLAMP_LINEAR_MIP_LINEAR == null) {
-            Builder b = new Builder(rs);
-            b.setMinification(Value.LINEAR_MIP_LINEAR);
-            b.setMagnification(Value.LINEAR);
-            b.setWrapS(Value.CLAMP);
-            b.setWrapT(Value.CLAMP);
-            rs.mSampler_CLAMP_LINEAR_MIP_LINEAR = b.create();
+        if (rs.mSampler_CLAMP_LINEAR_MIP_LINEAR == null) {
+            synchronized (rs) {
+                if (rs.mSampler_CLAMP_LINEAR_MIP_LINEAR == null) {
+                    Builder b = new Builder(rs);
+                    b.setMinification(Value.LINEAR_MIP_LINEAR);
+                    b.setMagnification(Value.LINEAR);
+                    b.setWrapS(Value.CLAMP);
+                    b.setWrapT(Value.CLAMP);
+                    rs.mSampler_CLAMP_LINEAR_MIP_LINEAR = b.create();
+                }
+            }
         }
         return rs.mSampler_CLAMP_LINEAR_MIP_LINEAR;
     }
@@ -158,13 +170,17 @@
      * @return Sampler
      */
     public static Sampler WRAP_NEAREST(RenderScript rs) {
-        if(rs.mSampler_WRAP_NEAREST == null) {
-            Builder b = new Builder(rs);
-            b.setMinification(Value.NEAREST);
-            b.setMagnification(Value.NEAREST);
-            b.setWrapS(Value.WRAP);
-            b.setWrapT(Value.WRAP);
-            rs.mSampler_WRAP_NEAREST = b.create();
+        if (rs.mSampler_WRAP_NEAREST == null) {
+            synchronized (rs) {
+                if (rs.mSampler_WRAP_NEAREST == null) {
+                    Builder b = new Builder(rs);
+                    b.setMinification(Value.NEAREST);
+                    b.setMagnification(Value.NEAREST);
+                    b.setWrapS(Value.WRAP);
+                    b.setWrapT(Value.WRAP);
+                    rs.mSampler_WRAP_NEAREST = b.create();
+                }
+            }
         }
         return rs.mSampler_WRAP_NEAREST;
     }
@@ -178,13 +194,17 @@
      * @return Sampler
      */
     public static Sampler WRAP_LINEAR(RenderScript rs) {
-        if(rs.mSampler_WRAP_LINEAR == null) {
-            Builder b = new Builder(rs);
-            b.setMinification(Value.LINEAR);
-            b.setMagnification(Value.LINEAR);
-            b.setWrapS(Value.WRAP);
-            b.setWrapT(Value.WRAP);
-            rs.mSampler_WRAP_LINEAR = b.create();
+        if (rs.mSampler_WRAP_LINEAR == null) {
+            synchronized (rs) {
+                if (rs.mSampler_WRAP_LINEAR == null) {
+                    Builder b = new Builder(rs);
+                    b.setMinification(Value.LINEAR);
+                    b.setMagnification(Value.LINEAR);
+                    b.setWrapS(Value.WRAP);
+                    b.setWrapT(Value.WRAP);
+                    rs.mSampler_WRAP_LINEAR = b.create();
+                }
+            }
         }
         return rs.mSampler_WRAP_LINEAR;
     }
@@ -198,13 +218,17 @@
      * @return Sampler
      */
     public static Sampler WRAP_LINEAR_MIP_LINEAR(RenderScript rs) {
-        if(rs.mSampler_WRAP_LINEAR_MIP_LINEAR == null) {
-            Builder b = new Builder(rs);
-            b.setMinification(Value.LINEAR_MIP_LINEAR);
-            b.setMagnification(Value.LINEAR);
-            b.setWrapS(Value.WRAP);
-            b.setWrapT(Value.WRAP);
-            rs.mSampler_WRAP_LINEAR_MIP_LINEAR = b.create();
+        if (rs.mSampler_WRAP_LINEAR_MIP_LINEAR == null) {
+            synchronized (rs) {
+                if (rs.mSampler_WRAP_LINEAR_MIP_LINEAR == null) {
+                    Builder b = new Builder(rs);
+                    b.setMinification(Value.LINEAR_MIP_LINEAR);
+                    b.setMagnification(Value.LINEAR);
+                    b.setWrapS(Value.WRAP);
+                    b.setWrapT(Value.WRAP);
+                    rs.mSampler_WRAP_LINEAR_MIP_LINEAR = b.create();
+                }
+            }
         }
         return rs.mSampler_WRAP_LINEAR_MIP_LINEAR;
     }
@@ -218,13 +242,17 @@
      * @return Sampler
      */
     public static Sampler MIRRORED_REPEAT_NEAREST(RenderScript rs) {
-        if(rs.mSampler_MIRRORED_REPEAT_NEAREST == null) {
-            Builder b = new Builder(rs);
-            b.setMinification(Value.NEAREST);
-            b.setMagnification(Value.NEAREST);
-            b.setWrapS(Value.MIRRORED_REPEAT);
-            b.setWrapT(Value.MIRRORED_REPEAT);
-            rs.mSampler_MIRRORED_REPEAT_NEAREST = b.create();
+        if (rs.mSampler_MIRRORED_REPEAT_NEAREST == null) {
+            synchronized (rs) {
+                if (rs.mSampler_MIRRORED_REPEAT_NEAREST == null) {
+                    Builder b = new Builder(rs);
+                    b.setMinification(Value.NEAREST);
+                    b.setMagnification(Value.NEAREST);
+                    b.setWrapS(Value.MIRRORED_REPEAT);
+                    b.setWrapT(Value.MIRRORED_REPEAT);
+                    rs.mSampler_MIRRORED_REPEAT_NEAREST = b.create();
+                }
+            }
         }
         return rs.mSampler_MIRRORED_REPEAT_NEAREST;
     }
@@ -238,13 +266,17 @@
      * @return Sampler
      */
     public static Sampler MIRRORED_REPEAT_LINEAR(RenderScript rs) {
-        if(rs.mSampler_MIRRORED_REPEAT_LINEAR == null) {
-            Builder b = new Builder(rs);
-            b.setMinification(Value.LINEAR);
-            b.setMagnification(Value.LINEAR);
-            b.setWrapS(Value.MIRRORED_REPEAT);
-            b.setWrapT(Value.MIRRORED_REPEAT);
-            rs.mSampler_MIRRORED_REPEAT_LINEAR = b.create();
+        if (rs.mSampler_MIRRORED_REPEAT_LINEAR == null) {
+            synchronized (rs) {
+                if (rs.mSampler_MIRRORED_REPEAT_LINEAR == null) {
+                    Builder b = new Builder(rs);
+                    b.setMinification(Value.LINEAR);
+                    b.setMagnification(Value.LINEAR);
+                    b.setWrapS(Value.MIRRORED_REPEAT);
+                    b.setWrapT(Value.MIRRORED_REPEAT);
+                    rs.mSampler_MIRRORED_REPEAT_LINEAR = b.create();
+                }
+            }
         }
         return rs.mSampler_MIRRORED_REPEAT_LINEAR;
     }
@@ -258,13 +290,17 @@
      * @return Sampler
      */
     public static Sampler MIRRORED_REPEAT_LINEAR_MIP_LINEAR(RenderScript rs) {
-        if(rs.mSampler_MIRRORED_REPEAT_LINEAR_MIP_LINEAR == null) {
-            Builder b = new Builder(rs);
-            b.setMinification(Value.LINEAR_MIP_LINEAR);
-            b.setMagnification(Value.LINEAR);
-            b.setWrapS(Value.MIRRORED_REPEAT);
-            b.setWrapT(Value.MIRRORED_REPEAT);
-            rs.mSampler_MIRRORED_REPEAT_LINEAR_MIP_LINEAR = b.create();
+        if (rs.mSampler_MIRRORED_REPEAT_LINEAR_MIP_LINEAR == null) {
+            synchronized (rs) {
+                if (rs.mSampler_MIRRORED_REPEAT_LINEAR_MIP_LINEAR == null) {
+                    Builder b = new Builder(rs);
+                    b.setMinification(Value.LINEAR_MIP_LINEAR);
+                    b.setMagnification(Value.LINEAR);
+                    b.setWrapS(Value.MIRRORED_REPEAT);
+                    b.setWrapT(Value.MIRRORED_REPEAT);
+                    rs.mSampler_MIRRORED_REPEAT_LINEAR_MIP_LINEAR = b.create();
+                }
+            }
         }
         return rs.mSampler_MIRRORED_REPEAT_LINEAR_MIP_LINEAR;
     }