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diff --git a/libparc/parc/concurrent/parc_Timeout.h b/libparc/parc/concurrent/parc_Timeout.h
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+++ b/libparc/parc/concurrent/parc_Timeout.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.
+ */
+
+/**
+ * @ingroup threading
+ *
+ */
+#ifndef parc_Timeout_h
+#define parc_Timeout_h
+#include <stdio.h>
+#include <stdint.h>
+#include <stdbool.h>
+
+typedef uint64_t PARCTimeout;
+
+/**
+ * @def PARCTimeout_Never
+ * This represents a timeout that will never happen.
+ */
+#define PARCTimeout_Never NULL
+
+/*
+ * @def PARCTimeout_Immediate
+ * This represents a timeout that immediately happens.
+ * Equivalent to parcTimeout_NanoSeconds(0)
+ */
+#define PARCTimeout_Immediate (&(PARCTimeout) { 0 })
+
+/*
+ * @def PARCTimeout_NanoSeconds
+ * This represents a timeout that will occur in the specified number of nanoseconds.
+ */
+#define parcTimeout_NanoSeconds(_nsec_) (&(PARCTimeout) { _nsec_ })
+
+/*
+ * @def PARCTimeout_MicroSeconds
+ * This represents a timeout that will occur in the specified number of microseconds.
+ */
+#define parcTimeout_MicroSeconds(_usec_) parcTimeout_NanoSeconds(_usec_ * 1000)
+
+/*
+ * @def PARCTimeout_MilliSeconds
+ * This represents a timeout that will occur in the specified number of microseconds.
+ */
+#define parcTimeout_MilliSeconds(_msec_) parcTimeout_MicroSeconds(_msec_ * 1000)
+
+/**
+ * Determine if two `PARCTimeout` instances are equal.
+ *
+ * The following equivalence relations on non-null `PARCTimeout` instances are maintained: *
+ *   * It is reflexive: for any non-null reference value x, `parcTimeout_Equals(x, x)` must return true.
+ *
+ *   * It is symmetric: for any non-null reference values x and y, `parcTimeout_Equals(x, y)` must return true if and only if
+ *        `parcTimeout_Equals(y x)` returns true.
+ *
+ *   * It is transitive: for any non-null reference values x, y, and z, if
+ *        `parcTimeout_Equals(x, y)` returns true and
+ *        `parcTimeout_Equals(y, z)` returns true,
+ *        then `parcTimeout_Equals(x, z)` must return true.
+ *
+ *   * It is consistent: for any non-null reference values x and y, multiple invocations of `parcTimeout_Equals(x, y)`
+ *         consistently return true or consistently return false.
+ *
+ *   * For any non-null reference value x, `parcTimeout_Equals(x, NULL)` must return false.
+ *
+ * @param [in] x A valid PARCTimeout instance.
+ * @param [in] y A valid PARCTimeout instance.
+ *
+ * @return true The instances x and y are equal.
+ *
+ * Example:
+ * @code
+ * {
+ *     PARCTimeout *a = parcTimeout_Create();
+ *     PARCTimeout *b = parcTimeout_Create();
+ *
+ *     if (parcTimeout_Equals(a, b)) {
+ *         printf("Instances are equal.\n");
+ *     }
+ *
+ *     parcTimeout_Release(&a);
+ *     parcTimeout_Release(&b);
+ * }
+ * @endcode
+ * @see parcTimeout_HashCode
+ */
+bool parcTimeout_Equals(PARCTimeout x, PARCTimeout y);
+
+/**
+ * Predicate function returning true if the given timeout represents an infinite delay.
+ *
+ * @param [in] timeout A pointer to a valid PARCTimeout value.
+ *
+ * @return true  The given timeout represents an infinite delay.
+ */
+static inline bool
+parcTimeout_IsNever(const PARCTimeout *timeout)
+{
+    return (timeout == PARCTimeout_Never);
+}
+
+/**
+ * Predicate function returning true if the given timeout represents an immediate, no-delay timeout.
+ *
+ * @param [in] timeout A pointer to a valid PARCTimeout value.
+ *
+ * @return true  The given timeout represents an immediate, no-delay timeout.
+ */
+static inline bool
+parcTimeout_IsImmediate(const PARCTimeout *timeout)
+{
+    return parcTimeout_IsNever(timeout) ? false : (*timeout == 0);
+}
+
+/**
+ * Return the number of nano-seconds in the given PARCTimeout instance.
+ *
+ * If the PARCTimeout is never (`parcTimeout_IsNever` returns `true`), the returned value is UINT64_MAX.
+ *
+ * @param [in] timeout A pointer to a valid PARCTimeout value.
+ *
+ * @return The number of nano-seconds in the given PARCTimeout instance, UINT64_MAX.
+ */
+static inline uint64_t
+parcTimeout_InNanoSeconds(const PARCTimeout *timeout)
+{
+    return parcTimeout_IsNever(timeout) ? UINT64_MAX : *timeout;
+}
+#endif /* parc_Timeout_h */