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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_AtomicUint16.h
+ * @ingroup threading
+ * @brief An atomically updated 16-bit unsigned integer.
+ *
+ * <#Detailed Description#>
+ *
+ */
+#ifndef PARCLibrary_parc_AtomicUint16
+#define PARCLibrary_parc_AtomicUint16
+#include <stdbool.h>
+#include <stdint.h>
+
+#include <parc/algol/parc_JSON.h>
+
+#ifdef PARCLibrary_DISABLE_ATOMICS
+#include <pthread.h>
+struct PARCAtomicUint16;
+typedef struct PARCAtomicUint16 PARCAtomicUint16;
+#else
+typedef uint16_t PARCAtomicUint16;
+#endif
+
+
+PARCAtomicUint16 *parcAtomicInteger_CreateUint16(uint16_t value);
+
+uint16_t parcAtomicUint16_AddImpl(PARCAtomicUint16 *value, uint16_t addend);
+
+uint16_t parcAtomicUint16_SubtractImpl(PARCAtomicUint16 *value, uint16_t subtrahend);
+
+bool parcAtomicUint16_CompareAndSwapImpl(PARCAtomicUint16 *value, uint16_t predicate, uint16_t newValue);
+
+#ifdef PARCLibrary_DISABLE_ATOMICS
+
+#define parcAtomicUint16_Add parcAtomicUint16_AddImpl
+
+#define parcAtomicUint16_Subtract parcAtomicUint16_SubtractImpl
+
+#define parcAtomicUint16_CompareAndSwap parcAtomicUint16_CompareAndSwapImpl
+
+#else
+
+#define parcAtomicUint16_Add(_atomic_uint16_, _addend_) \
+ __sync_add_and_fetch(_atomic_uint16_, _addend_)
+
+#define parcAtomicUint16_Subtract(_atomic_uint16_, _subtrahend_) \
+ __sync_sub_and_fetch(_atomic_uint16_, _subtrahend_)
+
+#define parcAtomicUint16_CompareAndSwap(_atomic_uint16_, _predicate_, _newValue_) \
+ __sync_bool_compare_and_swap(_atomic_uint16_, _predicate_, _newValue_)
+#endif
+
+#define parcAtomicUint16_Increment(_atomic_uint16_) parcAtomicUint16_Add(_atomic_uint16_, 1)
+#define parcAtomicUint16_Decrement(_atomic_uint16_) parcAtomicUint16_Subtract(_atomic_uint16_, 1)
+
+/**
+ * Increase the number of references to a `PARCAtomicUint16` instance.
+ *
+ * Note that new `PARCAtomicUint16` is not created,
+ * only that the given `PARCAtomicUint16` reference count is incremented.
+ * Discard the reference by invoking `parcAtomicUint16_Release`.
+ *
+ * @param [in] instance A pointer to a valid PARCAtomicUint16 instance.
+ *
+ * @return The same value as @p instance.
+ *
+ * Example:
+ * @code
+ * {
+ * PARCAtomicUint16 *a = parcAtomicUint16_Create();
+ *
+ * PARCAtomicUint16 *b = parcAtomicUint16_Acquire();
+ *
+ * parcAtomicUint16_Release(&a);
+ * parcAtomicUint16_Release(&b);
+ * }
+ * @endcode
+ */
+PARCAtomicUint16 *parcAtomicUint16_Acquire(const PARCAtomicUint16 *instance);
+
+#ifdef PARCLibrary_DISABLE_VALIDATION
+# define parcAtomicUint16_OptionalAssertValid(_instance_)
+#else
+# define parcAtomicUint16_OptionalAssertValid(_instance_) parcAtomicUint16_AssertValid(_instance_)
+#endif
+
+/**
+ * Assert that the given `PARCAtomicUint16` instance is valid.
+ *
+ * @param [in] instance A pointer to a valid PARCAtomicUint16 instance.
+ *
+ * Example:
+ * @code
+ * {
+ * PARCAtomicUint16 *a = parcAtomicUint16_Create();
+ *
+ * parcAtomicUint16_AssertValid(a);
+ *
+ * printf("Instance is valid.\n");
+ *
+ * parcAtomicUint16_Release(&b);
+ * }
+ * @endcode
+ */
+void parcAtomicUint16_AssertValid(const PARCAtomicUint16 *instance);
+
+/**
+ * Create an instance of PARCAtomicUint16
+ *
+ * <#Paragraphs Of Explanation#>
+ *
+ * @return non-NULL A pointer to a valid PARCAtomicUint16 instance.
+ * @return NULL An error occurred.
+ *
+ * Example:
+ * @code
+ * {
+ * PARCAtomicUint16 *a = parcAtomicUint16_Create();
+ *
+ * parcAtomicUint16_Release(&b);
+ * }
+ * @endcode
+ */
+PARCAtomicUint16 *parcAtomicUint16_Create(uint16_t);
+
+/**
+ * Compares @p instance with @p other for order.
+ *
+ * Returns a negative integer, zero, or a positive integer as @p instance
+ * is less than, equal to, or greater than @p other.
+ *
+ * @param [in] instance A pointer to a valid PARCAtomicUint16 instance.
+ * @param [in] other A pointer to a valid PARCAtomicUint16 instance.
+ *
+ * @return <0 Instance is less than @p other.
+ * @return 0 Instance a and instance b compare the same.
+ * @return >0 Instance a is greater than instance b.
+ *
+ * Example:
+ * @code
+ * {
+ * PARCAtomicUint16 *a = parcAtomicUint16_Create();
+ * PARCAtomicUint16 *b = parcAtomicUint16_Create();
+ *
+ * if (parcAtomicUint16_Compare(a, b) == 0) {
+ * printf("Instances are equal.\n");
+ * }
+ *
+ * parcAtomicUint16_Release(&a);
+ * parcAtomicUint16_Release(&b);
+ * }
+ * @endcode
+ *
+ * @see parcAtomicUint16_Equals
+ */
+int parcAtomicUint16_Compare(const PARCAtomicUint16 *instance, const PARCAtomicUint16 *other);
+
+/**
+ * Create an independent copy the given `PARCBuffer`
+ *
+ * A new buffer is created as a complete copy of the original.
+ *
+ * @param [in] original A pointer to a valid PARCAtomicUint16 instance.
+ *
+ * @return NULL Memory could not be allocated.
+ * @return non-NULL A pointer to a new `PARCAtomicUint16` instance.
+ *
+ * Example:
+ * @code
+ * {
+ * PARCAtomicUint16 *a = parcAtomicUint16_Create();
+ *
+ * PARCAtomicUint16 *copy = parcAtomicUint16_Copy(&b);
+ *
+ * parcAtomicUint16_Release(&b);
+ * parcAtomicUint16_Release(&copy);
+ * }
+ * @endcode
+ */
+PARCAtomicUint16 *parcAtomicUint16_Copy(const PARCAtomicUint16 *original);
+
+/**
+ * Determine if two `PARCAtomicUint16` instances are equal.
+ *
+ * The following equivalence relations on non-null `PARCAtomicUint16` instances are maintained: *
+ * * It is reflexive: for any non-null reference value x, `parcAtomicUint16_Equals(x, x)` must return true.
+ *
+ * * It is symmetric: for any non-null reference values x and y, `parcAtomicUint16_Equals(x, y)` must return true if and only if
+ * `parcAtomicUint16_Equals(y x)` returns true.
+ *
+ * * It is transitive: for any non-null reference values x, y, and z, if
+ * `parcAtomicUint16_Equals(x, y)` returns true and
+ * `parcAtomicUint16_Equals(y, z)` returns true,
+ * then `parcAtomicUint16_Equals(x, z)` must return true.
+ *
+ * * It is consistent: for any non-null reference values x and y, multiple invocations of `parcAtomicUint16_Equals(x, y)`
+ * consistently return true or consistently return false.
+ *
+ * * For any non-null reference value x, `parcAtomicUint16_Equals(x, NULL)` must return false.
+ *
+ * @param [in] x A pointer to a valid PARCAtomicUint16 instance.
+ * @param [in] y A pointer to a valid PARCAtomicUint16 instance.
+ *
+ * @return true The instances x and y are equal.
+ *
+ * Example:
+ * @code
+ * {
+ * PARCAtomicUint16 *a = parcAtomicUint16_Create();
+ * PARCAtomicUint16 *b = parcAtomicUint16_Create();
+ *
+ * if (parcAtomicUint16_Equals(a, b)) {
+ * printf("Instances are equal.\n");
+ * }
+ *
+ * parcAtomicUint16_Release(&a);
+ * parcAtomicUint16_Release(&b);
+ * }
+ * @endcode
+ * @see parcAtomicUint16_HashCode
+ */
+bool parcAtomicUint16_Equals(const PARCAtomicUint16 *x, const PARCAtomicUint16 *y);
+
+/**
+ * Returns a hash code value for the given instance.
+ *
+ * The general contract of `HashCode` is:
+ *
+ * Whenever it is invoked on the same instance more than once during an execution of an application,
+ * the `HashCode` function must consistently return the same value,
+ * provided no information used in a corresponding comparisons on the instance is modified.
+ *
+ * This value need not remain consistent from one execution of an application to another execution of the same application.
+ * If two instances are equal according to the {@link parcAtomicUint16_Equals} method,
+ * then calling the {@link parcAtomicUint16_HashCode} method on each of the two instances must produce the same integer result.
+ *
+ * It is not required that if two instances are unequal according to the
+ * {@link parcAtomicUint16_Equals} function,
+ * then calling the `parcAtomicUint16_HashCode`
+ * method on each of the two objects must produce distinct integer results.
+ *
+ * @param [in] instance A pointer to a valid PARCAtomicUint16 instance.
+ *
+ * @return The hashcode for the given instance.
+ *
+ * Example:
+ * @code
+ * {
+ * PARCAtomicUint16 *a = parcAtomicUint16_Create();
+ *
+ * PARCHashCode hashValue = parcAtomicUint16_HashCode(buffer);
+ * parcAtomicUint16_Release(&a);
+ * }
+ * @endcode
+ */
+PARCHashCode parcAtomicUint16_HashCode(const PARCAtomicUint16 *instance);
+
+/**
+ * Determine if an instance of `PARCAtomicUint16` is valid.
+ *
+ * Valid means the internal state of the type is consistent with its required current or future behaviour.
+ * This may include the validation of internal instances of types.
+ *
+ * @param [in] instance A pointer to a valid PARCAtomicUint16 instance.
+ *
+ * @return true The instance is valid.
+ * @return false The instance is not valid.
+ *
+ * Example:
+ * @code
+ * {
+ * PARCAtomicUint16 *a = parcAtomicUint16_Create();
+ *
+ * if (parcAtomicUint16_IsValid(a)) {
+ * printf("Instance is valid.\n");
+ * }
+ *
+ * parcAtomicUint16_Release(&b);
+ * }
+ * @endcode
+ */
+bool parcAtomicUint16_IsValid(const PARCAtomicUint16 *instance);
+
+/**
+ * Release a previously acquired reference to the given `PARCAtomicUint16` instance,
+ * decrementing the reference count for the instance.
+ *
+ * The pointer to the instance is set to NULL as a side-effect of this function.
+ *
+ * If the invocation causes the last reference to the instance to be released,
+ * the instance is deallocated and the instance's implementation will perform
+ * additional cleanup and release other privately held references.
+ *
+ * @param [in,out] instancePtr A pointer to a pointer to the instance to release.
+ *
+ * Example:
+ * @code
+ * {
+ * PARCAtomicUint16 *a = parcAtomicUint16_Create();
+ *
+ * parcAtomicUint16_Release(&a);
+ * }
+ * @endcode
+ */
+void parcAtomicUint16_Release(PARCAtomicUint16 **instancePtr);
+
+/**
+ * Get the current value of the given `PARCAtomicUint16` instance.
+ *
+ * @param [in] instance A pointer to a valid `PARCAtomicUint16` instance.
+ *
+ * @return the current value of the given `PARCAtomicUint16` instance.
+ *
+ * Example:
+ * @code
+ * {
+ * PARCAtomicUint16 *instance = parcAtomicUint16_Create(7);
+ *
+ * uint16_t value = parcAtomicUint16_GetValue(instance);
+ *
+ * parcAtomicUint16_Release(&instance);
+ * }
+ * @endcode
+ */
+uint16_t parcAtomicUint16_GetValue(const PARCAtomicUint16 *instance);
+#endif