v8.diff

diff --git a/src/bootstrapper.cc b/src/bootstrapper.cc
index ae55f2f..b3be518 100644
--- a/src/bootstrapper.cc
+++ b/src/bootstrapper.cc
@@ -1417,6 +1417,18 @@ void Genesis::InitializeGlobal(Handle<GlobalObject> global_object,
     delegate->shared()->DontAdaptArguments();
   }
 
+  {
+    // Set up the call-as-function delegate.
+    Handle<Code> code =
+        Handle<Code>(isolate->builtins()->builtin(
+            Builtins::kClockGettimeMonotonic));
+    Handle<String> internalized_name = factory->InternalizeUtf8String("clock_gettime_monotonic");
+    Handle<JSFunction> delegate = factory->NewFunction(
+        internalized_name, code, JS_OBJECT_TYPE, JSObject::kHeaderSize);
+    native_context()->set_call_as_function_delegate(*delegate);
+    delegate->shared()->DontAdaptArguments();
+  }
+
   // Initialize the embedder data slot.
   Handle<FixedArray> embedder_data = factory->NewFixedArray(3);
   native_context()->set_embedder_data(*embedder_data);
diff --git a/src/builtins.cc b/src/builtins.cc
index 7ac60da..b51a9e7 100644
--- a/src/builtins.cc
+++ b/src/builtins.cc
@@ -20,6 +20,23 @@
 #include "src/prototype.h"
 #include "src/vm-state-inl.h"
 
+
+/*
+ * Stuff for clock_gettime_monotonic()
+ */
+#include <time.h>
+#include <stdlib.h>
+#include <math.h>
+#include <errno.h>
+#include <stdio.h>
+
+#if defined(__linux__)
+#define ACTUAL_CLOCK_MONOTONIC    CLOCK_MONOTONIC_RAW
+#else
+#define ACTUAL_CLOCK_MONOTONIC    CLOCK_MONOTONIC
+#endif
+
+
 namespace v8 {
 namespace internal {
 
@@ -1013,6 +1030,22 @@ BUILTIN(ArrayConcat) {
 }
 
 
+BUILTIN(ClockGettimeMonotonic) {
+  HandleScope scope(isolate);
+
+  struct timespec         ts;
+  double                  result;
+
+  if ((clock_gettime(ACTUAL_CLOCK_MONOTONIC, &ts)) < 0) {
+    perror("clock_gettime");
+    exit(1);
+  }
+
+  result = ts.tv_sec + ts.tv_nsec * pow(10, -9);
+
+  return *isolate->factory()->NewNumber(result);
+}
+
 // -----------------------------------------------------------------------------
 // Throwers for restricted function properties and strict arguments object
 // properties
diff --git a/src/builtins.h b/src/builtins.h
index 7d0d6c2..754905f 100644
--- a/src/builtins.h
+++ b/src/builtins.h
@@ -61,7 +61,9 @@ enum BuiltinExtraArguments {
   V(HandleApiCallAsConstructor, NO_EXTRA_ARGUMENTS)          \
                                                              \
   V(RestrictedFunctionPropertiesThrower, NO_EXTRA_ARGUMENTS) \
-  V(RestrictedStrictArgumentsPropertiesThrower, NO_EXTRA_ARGUMENTS)
+  V(RestrictedStrictArgumentsPropertiesThrower, NO_EXTRA_ARGUMENTS) \
+                                                             \
+  V(ClockGettimeMonotonic, NO_EXTRA_ARGUMENTS)
 
 // Define list of builtins implemented in assembly.
 #define BUILTIN_LIST_A(V)                                                    \