diff --git a/libutils/Android.bp b/libutils/Android.bp
index 2c05fbc..b3ddda3 100644
--- a/libutils/Android.bp
+++ b/libutils/Android.bp
@@ -132,25 +132,19 @@
     ],
     native_bridge_supported: true,
 
+    whole_static_libs: ["libutils_binder"],
+
     srcs: [
-        "Errors.cpp",
         "FileMap.cpp",
         "JenkinsHash.cpp",
         "LightRefBase.cpp",
         "NativeHandle.cpp",
         "Printer.cpp",
-        "RefBase.cpp",
-        "SharedBuffer.cpp",
         "StopWatch.cpp",
-        "String8.cpp",
-        "String16.cpp",
-        "StrongPointer.cpp",
         "SystemClock.cpp",
         "Threads.cpp",
         "Timers.cpp",
         "Tokenizer.cpp",
-        "Unicode.cpp",
-        "VectorImpl.cpp",
         "misc.cpp",
     ],
 
@@ -208,7 +202,6 @@
     defaults: ["libutils_impl_defaults"],
 
     cflags: [
-        "-DCALLSTACKS=1",
         "-DDEBUG_POLL_AND_WAKE=1",
         "-DDEBUG_REFS=1",
         "-DDEBUG_TOKENIZER=1",
@@ -275,24 +268,6 @@
 }
 
 cc_fuzz {
-    name: "libutils_fuzz_string8",
-    defaults: ["libutils_fuzz_defaults"],
-    srcs: ["String8_fuzz.cpp"],
-}
-
-cc_fuzz {
-    name: "libutils_fuzz_string16",
-    defaults: ["libutils_fuzz_defaults"],
-    srcs: ["String16_fuzz.cpp"],
-}
-
-cc_fuzz {
-    name: "libutils_fuzz_vector",
-    defaults: ["libutils_fuzz_defaults"],
-    srcs: ["Vector_fuzz.cpp"],
-}
-
-cc_fuzz {
     name: "libutils_fuzz_printer",
     defaults: ["libutils_fuzz_defaults"],
     srcs: ["Printer_fuzz.cpp"],
@@ -317,12 +292,6 @@
 }
 
 cc_fuzz {
-    name: "libutils_fuzz_refbase",
-    defaults: ["libutils_fuzz_defaults"],
-    srcs: ["RefBase_fuzz.cpp"],
-}
-
-cc_fuzz {
     name: "libutils_fuzz_lrucache",
     defaults: ["libutils_fuzz_defaults"],
     srcs: ["LruCache_fuzz.cpp"],
@@ -341,18 +310,11 @@
     srcs: [
         "BitSet_test.cpp",
         "CallStack_test.cpp",
-        "Errors_test.cpp",
         "FileMap_test.cpp",
         "LruCache_test.cpp",
         "Mutex_test.cpp",
-        "SharedBuffer_test.cpp",
         "Singleton_test.cpp",
-        "String16_test.cpp",
-        "String8_test.cpp",
-        "StrongPointer_test.cpp",
         "Timers_test.cpp",
-        "Unicode_test.cpp",
-        "Vector_test.cpp",
     ],
 
     target: {
@@ -374,7 +336,6 @@
         linux: {
             srcs: [
                 "Looper_test.cpp",
-                "RefBase_test.cpp",
             ],
         },
         host: {
@@ -428,9 +389,3 @@
     shared_libs: ["libutils_test_singleton1"],
     header_libs: ["libutils_headers"],
 }
-
-cc_benchmark {
-    name: "libutils_benchmark",
-    srcs: ["Vector_benchmark.cpp"],
-    shared_libs: ["libutils"],
-}
diff --git a/libutils/TEST_MAPPING b/libutils/TEST_MAPPING
index c8ef45c..472146f 100644
--- a/libutils/TEST_MAPPING
+++ b/libutils/TEST_MAPPING
@@ -2,6 +2,9 @@
   "presubmit": [
     {
       "name": "libutils_test"
+    },
+    {
+      "name": "libutils_binder_test"
     }
   ]
 }
diff --git a/libutils/binder/Android.bp b/libutils/binder/Android.bp
new file mode 100644
index 0000000..e2eddb3
--- /dev/null
+++ b/libutils/binder/Android.bp
@@ -0,0 +1,126 @@
+package {
+    default_applicable_licenses: ["system_core_libutils_license"],
+}
+
+cc_defaults {
+    name: "libutils_binder_impl_defaults",
+    defaults: [
+        "libutils_defaults",
+        "apex-lowest-min-sdk-version",
+    ],
+    native_bridge_supported: true,
+
+    srcs: [
+        "Errors.cpp",
+        "RefBase.cpp",
+        "SharedBuffer.cpp",
+        "String16.cpp",
+        "String8.cpp",
+        "StrongPointer.cpp",
+        "Unicode.cpp",
+        "VectorImpl.cpp",
+    ],
+
+    apex_available: [
+        "//apex_available:anyapex",
+        "//apex_available:platform",
+    ],
+
+    afdo: true,
+}
+
+cc_library {
+    name: "libutils_binder",
+    defaults: ["libutils_binder_impl_defaults"],
+}
+
+cc_library {
+    name: "libutils_binder_test_compile",
+    defaults: ["libutils_binder_impl_defaults"],
+
+    cflags: [
+        "-DDEBUG_REFS=1",
+    ],
+
+    visibility: [":__subpackages__"],
+}
+
+cc_fuzz {
+    name: "libutils_fuzz_string8",
+    defaults: ["libutils_fuzz_defaults"],
+    srcs: ["String8_fuzz.cpp"],
+}
+
+cc_fuzz {
+    name: "libutils_fuzz_string16",
+    defaults: ["libutils_fuzz_defaults"],
+    srcs: ["String16_fuzz.cpp"],
+}
+
+cc_fuzz {
+    name: "libutils_fuzz_vector",
+    defaults: ["libutils_fuzz_defaults"],
+    srcs: ["Vector_fuzz.cpp"],
+}
+
+cc_fuzz {
+    name: "libutils_fuzz_refbase",
+    defaults: ["libutils_fuzz_defaults"],
+    srcs: ["RefBase_fuzz.cpp"],
+}
+
+cc_test {
+    name: "libutils_binder_test",
+    host_supported: true,
+
+    srcs: [
+        "Errors_test.cpp",
+        "SharedBuffer_test.cpp",
+        "String16_test.cpp",
+        "String8_test.cpp",
+        "StrongPointer_test.cpp",
+        "Unicode_test.cpp",
+        "Vector_test.cpp",
+    ],
+
+    target: {
+        android: {
+            shared_libs: [
+                "libbase",
+                "libcutils",
+                "liblog",
+                "liblzma",
+                "libutils", // which includes libutils_binder
+                "libz",
+            ],
+        },
+        linux: {
+            srcs: [
+                "RefBase_test.cpp",
+            ],
+        },
+        host: {
+            static_libs: [
+                "libbase",
+                "liblog",
+                "liblzma",
+                "libutils", // which includes libutils_binder
+            ],
+        },
+    },
+
+    cflags: [
+        "-Wall",
+        "-Wextra",
+        "-Werror",
+        "-Wthread-safety",
+    ],
+
+    test_suites: ["device-tests"],
+}
+
+cc_benchmark {
+    name: "libutils_binder_benchmark",
+    srcs: ["Vector_benchmark.cpp"],
+    shared_libs: ["libutils"],
+}
diff --git a/libutils/Errors.cpp b/libutils/binder/Errors.cpp
similarity index 100%
rename from libutils/Errors.cpp
rename to libutils/binder/Errors.cpp
diff --git a/libutils/Errors_test.cpp b/libutils/binder/Errors_test.cpp
similarity index 100%
rename from libutils/Errors_test.cpp
rename to libutils/binder/Errors_test.cpp
diff --git a/libutils/FuzzFormatTypes.h b/libutils/binder/FuzzFormatTypes.h
similarity index 100%
rename from libutils/FuzzFormatTypes.h
rename to libutils/binder/FuzzFormatTypes.h
diff --git a/libutils/RefBase.cpp b/libutils/binder/RefBase.cpp
similarity index 98%
rename from libutils/RefBase.cpp
rename to libutils/binder/RefBase.cpp
index e0a2846..c7055fb 100644
--- a/libutils/RefBase.cpp
+++ b/libutils/binder/RefBase.cpp
@@ -18,6 +18,7 @@
 // #define LOG_NDEBUG 0
 
 #include <memory>
+#include <mutex>
 
 #include <android-base/macros.h>
 
@@ -27,8 +28,6 @@
 #include <utils/RefBase.h>
 #include <utils/String8.h>
 
-#include <utils/Mutex.h>
-
 #ifndef __unused
 #define __unused __attribute__((__unused__))
 #endif
@@ -310,7 +309,7 @@
         String8 text;
 
         {
-            Mutex::Autolock _l(mMutex);
+            std::lock_guard<std::mutex> _l(mMutex);
             char buf[128];
             snprintf(buf, sizeof(buf),
                      "Strong references on RefBase %p (weakref_type %p):\n",
@@ -353,7 +352,7 @@
     void addRef(ref_entry** refs, const void* id, int32_t mRef)
     {
         if (mTrackEnabled) {
-            AutoMutex _l(mMutex);
+            std::lock_guard<std::mutex> _l(mMutex);
 
             ref_entry* ref = new ref_entry;
             // Reference count at the time of the snapshot, but before the
@@ -372,7 +371,7 @@
     void removeRef(ref_entry** refs, const void* id)
     {
         if (mTrackEnabled) {
-            AutoMutex _l(mMutex);
+            std::lock_guard<std::mutex> _l(mMutex);
 
             ref_entry* const head = *refs;
             ref_entry* ref = head;
@@ -406,7 +405,7 @@
     void renameRefsId(ref_entry* r, const void* old_id, const void* new_id)
     {
         if (mTrackEnabled) {
-            AutoMutex _l(mMutex);
+            std::lock_guard<std::mutex> _l(mMutex);
             ref_entry* ref = r;
             while (ref != NULL) {
                 if (ref->id == old_id) {
@@ -434,7 +433,7 @@
         }
     }
 
-    mutable Mutex mMutex;
+    mutable std::mutex mMutex;
     ref_entry* mStrongRefs;
     ref_entry* mWeakRefs;
 
diff --git a/libutils/RefBase_fuzz.cpp b/libutils/binder/RefBase_fuzz.cpp
similarity index 100%
rename from libutils/RefBase_fuzz.cpp
rename to libutils/binder/RefBase_fuzz.cpp
diff --git a/libutils/RefBase_test.cpp b/libutils/binder/RefBase_test.cpp
similarity index 100%
rename from libutils/RefBase_test.cpp
rename to libutils/binder/RefBase_test.cpp
diff --git a/libutils/SharedBuffer.cpp b/libutils/binder/SharedBuffer.cpp
similarity index 100%
rename from libutils/SharedBuffer.cpp
rename to libutils/binder/SharedBuffer.cpp
diff --git a/libutils/SharedBuffer.h b/libutils/binder/SharedBuffer.h
similarity index 100%
rename from libutils/SharedBuffer.h
rename to libutils/binder/SharedBuffer.h
diff --git a/libutils/SharedBuffer_test.cpp b/libutils/binder/SharedBuffer_test.cpp
similarity index 100%
rename from libutils/SharedBuffer_test.cpp
rename to libutils/binder/SharedBuffer_test.cpp
diff --git a/libutils/String16.cpp b/libutils/binder/String16.cpp
similarity index 100%
rename from libutils/String16.cpp
rename to libutils/binder/String16.cpp
diff --git a/libutils/String16_fuzz.cpp b/libutils/binder/String16_fuzz.cpp
similarity index 100%
rename from libutils/String16_fuzz.cpp
rename to libutils/binder/String16_fuzz.cpp
diff --git a/libutils/String16_test.cpp b/libutils/binder/String16_test.cpp
similarity index 100%
rename from libutils/String16_test.cpp
rename to libutils/binder/String16_test.cpp
diff --git a/libutils/String8.cpp b/libutils/binder/String8.cpp
similarity index 100%
rename from libutils/String8.cpp
rename to libutils/binder/String8.cpp
diff --git a/libutils/String8_fuzz.cpp b/libutils/binder/String8_fuzz.cpp
similarity index 100%
rename from libutils/String8_fuzz.cpp
rename to libutils/binder/String8_fuzz.cpp
diff --git a/libutils/String8_test.cpp b/libutils/binder/String8_test.cpp
similarity index 100%
rename from libutils/String8_test.cpp
rename to libutils/binder/String8_test.cpp
diff --git a/libutils/StrongPointer.cpp b/libutils/binder/StrongPointer.cpp
similarity index 100%
rename from libutils/StrongPointer.cpp
rename to libutils/binder/StrongPointer.cpp
diff --git a/libutils/StrongPointer_test.cpp b/libutils/binder/StrongPointer_test.cpp
similarity index 100%
rename from libutils/StrongPointer_test.cpp
rename to libutils/binder/StrongPointer_test.cpp
diff --git a/libutils/Unicode.cpp b/libutils/binder/Unicode.cpp
similarity index 100%
rename from libutils/Unicode.cpp
rename to libutils/binder/Unicode.cpp
diff --git a/libutils/Unicode_test.cpp b/libutils/binder/Unicode_test.cpp
similarity index 100%
rename from libutils/Unicode_test.cpp
rename to libutils/binder/Unicode_test.cpp
diff --git a/libutils/VectorImpl.cpp b/libutils/binder/VectorImpl.cpp
similarity index 100%
rename from libutils/VectorImpl.cpp
rename to libutils/binder/VectorImpl.cpp
diff --git a/libutils/Vector_benchmark.cpp b/libutils/binder/Vector_benchmark.cpp
similarity index 100%
rename from libutils/Vector_benchmark.cpp
rename to libutils/binder/Vector_benchmark.cpp
diff --git a/libutils/Vector_fuzz.cpp b/libutils/binder/Vector_fuzz.cpp
similarity index 100%
rename from libutils/Vector_fuzz.cpp
rename to libutils/binder/Vector_fuzz.cpp
diff --git a/libutils/Vector_test.cpp b/libutils/binder/Vector_test.cpp
similarity index 100%
rename from libutils/Vector_test.cpp
rename to libutils/binder/Vector_test.cpp
diff --git a/libutils/include/utils/Errors.h b/libutils/binder/include/utils/Errors.h
similarity index 100%
rename from libutils/include/utils/Errors.h
rename to libutils/binder/include/utils/Errors.h
diff --git a/libutils/include/utils/RefBase.h b/libutils/binder/include/utils/RefBase.h
similarity index 100%
rename from libutils/include/utils/RefBase.h
rename to libutils/binder/include/utils/RefBase.h
diff --git a/libutils/include/utils/String16.h b/libutils/binder/include/utils/String16.h
similarity index 100%
rename from libutils/include/utils/String16.h
rename to libutils/binder/include/utils/String16.h
diff --git a/libutils/include/utils/String8.h b/libutils/binder/include/utils/String8.h
similarity index 100%
rename from libutils/include/utils/String8.h
rename to libutils/binder/include/utils/String8.h
diff --git a/libutils/include/utils/StrongPointer.h b/libutils/binder/include/utils/StrongPointer.h
similarity index 100%
rename from libutils/include/utils/StrongPointer.h
rename to libutils/binder/include/utils/StrongPointer.h
diff --git a/libutils/include/utils/Unicode.h b/libutils/binder/include/utils/Unicode.h
similarity index 100%
rename from libutils/include/utils/Unicode.h
rename to libutils/binder/include/utils/Unicode.h
diff --git a/libutils/include/utils/Vector.h b/libutils/binder/include/utils/Vector.h
similarity index 100%
rename from libutils/include/utils/Vector.h
rename to libutils/binder/include/utils/Vector.h
diff --git a/libutils/include/utils/VectorImpl.h b/libutils/binder/include/utils/VectorImpl.h
similarity index 100%
rename from libutils/include/utils/VectorImpl.h
rename to libutils/binder/include/utils/VectorImpl.h
diff --git a/libutils/include/utils/Errors.h b/libutils/include/utils/Errors.h
new file mode 120000
index 0000000..2eba10b
--- /dev/null
+++ b/libutils/include/utils/Errors.h
@@ -0,0 +1 @@
+../../binder/include/utils/Errors.h
\ No newline at end of file
diff --git a/libutils/include/utils/RefBase.h b/libutils/include/utils/RefBase.h
new file mode 120000
index 0000000..86d72b1
--- /dev/null
+++ b/libutils/include/utils/RefBase.h
@@ -0,0 +1 @@
+../../binder/include/utils/RefBase.h
\ No newline at end of file
diff --git a/libutils/include/utils/String16.h b/libutils/include/utils/String16.h
new file mode 120000
index 0000000..b88792f
--- /dev/null
+++ b/libutils/include/utils/String16.h
@@ -0,0 +1 @@
+../../binder/include/utils/String16.h
\ No newline at end of file
diff --git a/libutils/include/utils/String8.h b/libutils/include/utils/String8.h
new file mode 120000
index 0000000..fa5a082
--- /dev/null
+++ b/libutils/include/utils/String8.h
@@ -0,0 +1 @@
+../../binder/include/utils/String8.h
\ No newline at end of file
diff --git a/libutils/include/utils/StrongPointer.h b/libutils/include/utils/StrongPointer.h
new file mode 120000
index 0000000..fd8bc60
--- /dev/null
+++ b/libutils/include/utils/StrongPointer.h
@@ -0,0 +1 @@
+../../binder/include/utils/StrongPointer.h
\ No newline at end of file
diff --git a/libutils/include/utils/Unicode.h b/libutils/include/utils/Unicode.h
new file mode 120000
index 0000000..8a480bc
--- /dev/null
+++ b/libutils/include/utils/Unicode.h
@@ -0,0 +1 @@
+../../binder/include/utils/Unicode.h
\ No newline at end of file
diff --git a/libutils/include/utils/Vector.h b/libutils/include/utils/Vector.h
new file mode 120000
index 0000000..e1571ef
--- /dev/null
+++ b/libutils/include/utils/Vector.h
@@ -0,0 +1 @@
+../../binder/include/utils/Vector.h
\ No newline at end of file
diff --git a/libutils/include/utils/VectorImpl.h b/libutils/include/utils/VectorImpl.h
new file mode 120000
index 0000000..4726446
--- /dev/null
+++ b/libutils/include/utils/VectorImpl.h
@@ -0,0 +1 @@
+../../binder/include/utils/VectorImpl.h
\ No newline at end of file