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diff --git a/libparc/parc/developer/parc_TimingDarwin.h b/libparc/parc/developer/parc_TimingDarwin.h
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+/*
+ * Copyright (c) 2017 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @file parc_TimingDarwin.h
+ * @brief Macros for timing code
+ *
+ * On linux will use clock_gettime with the MONOTONIC RAW clock, which does not speed up or slow down based on adj_time().
+ *
+ */
+#ifndef libparc_parc_TimingDarwin_h
+#define libparc_parc_TimingDarwin_h
+
+#ifdef PARCTIMING_DARWIN
+#include <stdint.h>
+#include <time.h>
+#include <mach/mach.h>
+#include <mach/clock.h>
+#include <mach/mach_time.h>
+
+/*
+ * This allocates the clock service which must be released in the Fini macro
+ */
+#define _private_parcTiming_Init(prefix) \
+    clock_serv_t prefix ## _clockService; \
+    mach_timespec_t prefix ## _ts0, prefix ## _ts1; \
+    host_get_clock_service(mach_host_self(), SYSTEM_CLOCK, &(prefix ## _clockService));
+
+#define _private_parcTiming_Start(prefix) \
+    clock_get_time((prefix ## _clockService), &(prefix ## _ts0));
+
+#define _private_parcTiming_Stop(prefix) \
+    clock_get_time((prefix ## _clockService), &(prefix ## _ts1));
+
+static inline uint64_t
+_parcTiming_Delta(const mach_timespec_t *t0, const mach_timespec_t *t1)
+{
+    // SUB_MACH_TIMESPEC(t1, t2) => t1 -= t2
+
+    mach_timespec_t delta;
+    memcpy(&delta, t1, sizeof(delta));
+    SUB_MACH_TIMESPEC(&delta, t0);
+
+    return (uint64_t) delta.tv_sec * 1000000000ULL + delta.tv_nsec;
+}
+
+#define _private_parcTiming_Delta(prefix) _parcTiming_Delta(&(prefix ## _ts0), &(prefix ## _ts1))
+
+#define _private_parcTiming_Fini(prefix) \
+    mach_port_deallocate(mach_task_self(), &(prefix ## _clockService));
+
+#endif // PARCTIMING_DARWIN
+#endif // libparc_parc_TimingDarwin_h
+