diff options
Diffstat (limited to 'libparc/parc/developer/parc_Stopwatch.h')
| -rw-r--r-- | libparc/parc/developer/parc_Stopwatch.h | 446 |
1 files changed, 446 insertions, 0 deletions
diff --git a/libparc/parc/developer/parc_Stopwatch.h b/libparc/parc/developer/parc_Stopwatch.h new file mode 100644 index 00000000..566bd314 --- /dev/null +++ b/libparc/parc/developer/parc_Stopwatch.h @@ -0,0 +1,446 @@ +/* + * 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_Stopwatch.h + * @ingroup developer + * @brief Measure elapsed time + * + * A `PARCStopwatch` measures the time elapsed between the invocation of `parcStopwatch_Start()` + * and a subsequent invocation of one of the `parcStopwatch_ElapsedTime` functions. + * The `parcStopwatch_Start()` function may be called for a stopwatch effectively resetting the stopwatch to a new starting time. + * + */ +#ifndef PARCLibrary_parc_Stopwatch +#define PARCLibrary_parc_Stopwatch +#include <stdbool.h> +#include <stdarg.h> + +#include <parc/algol/parc_JSON.h> +#include <parc/algol/parc_HashCode.h> + +struct PARCStopwatch; +typedef struct PARCStopwatch PARCStopwatch; + +/** + * Increase the number of references to a `PARCStopwatch` instance. + * + * Note that new `PARCStopwatch` is not created, + * only that the given `PARCStopwatch` reference count is incremented. + * Discard the reference by invoking `parcStopwatch_Release`. + * + * @param [in] stopwatch A pointer to a valid PARCStopwatch instance. + * + * @return The same value as @p instance. + * + * Example: + * @code + * { + * PARCStopwatch *a = parcStopwatch_Create(); + * + * PARCStopwatch *b = parcStopwatch_Acquire(); + * + * parcStopwatch_Release(&a); + * parcStopwatch_Release(&b); + * } + * @endcode + */ +PARCStopwatch *parcStopwatch_Acquire(const PARCStopwatch *stopwatch); + +#ifdef PARCLibrary_DISABLE_VALIDATION +# define parcStopwatch_OptionalAssertValid(_instance_) +#else +# define parcStopwatch_OptionalAssertValid(_instance_) parcStopwatch_AssertValid(_instance_) +#endif + +/** + * Assert that the given `PARCStopwatch` instance is valid. + * + * @param [in] stopwatch A pointer to a valid PARCStopwatch instance. + * + * Example: + * @code + * { + * PARCStopwatch *a = parcStopwatch_Create(); + * + * parcStopwatch_AssertValid(a); + * + * printf("Instance is valid.\n"); + * + * parcStopwatch_Release(&b); + * } + * @endcode + */ +void parcStopwatch_AssertValid(const PARCStopwatch *stopwatch); + +/** + * Create an instance of PARCStopwatch + * + * @return non-NULL A pointer to a valid PARCStopwatch instance. + * @return NULL An error occurred. + * + * Example: + * @code + * { + * PARCStopwatch *a = parcStopwatch_Create(); + * + * parcStopwatch_Release(&a); + * } + * @endcode + */ +PARCStopwatch *parcStopwatch_Create(void); + +/** + * 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] stopwatch A pointer to a valid PARCStopwatch instance. + * @param [in] other A pointer to a valid PARCStopwatch 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 + * { + * PARCStopwatch *a = parcStopwatch_Create(); + * PARCStopwatch *b = parcStopwatch_Create(); + * + * if (parcStopwatch_Compare(a, b) == 0) { + * printf("Instances are equal.\n"); + * } + * + * parcStopwatch_Release(&a); + * parcStopwatch_Release(&b); + * } + * @endcode + * + * @see parcStopwatch_Equals + */ +int parcStopwatch_Compare(const PARCStopwatch *stopwatch, const PARCStopwatch *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 PARCStopwatch instance. + * + * @return NULL Memory could not be allocated. + * @return non-NULL A pointer to a new `PARCStopwatch` instance. + * + * Example: + * @code + * { + * PARCStopwatch *a = parcStopwatch_Create(); + * + * PARCStopwatch *copy = parcStopwatch_Copy(&b); + * + * parcStopwatch_Release(&b); + * parcStopwatch_Release(©); + * } + * @endcode + */ +PARCStopwatch *parcStopwatch_Copy(const PARCStopwatch *original); + +/** + * Print a human readable representation of the given `PARCStopwatch`. + * + * @param [in] stopwatch A pointer to a valid PARCStopwatch instance. + * @param [in] indentation The indentation level to use for printing. + * + * Example: + * @code + * { + * PARCStopwatch *a = parcStopwatch_Create(); + * + * parcStopwatch_Display(a, 0); + * + * parcStopwatch_Release(&a); + * } + * @endcode + */ +void parcStopwatch_Display(const PARCStopwatch *stopwatch, int indentation); + +/** + * Determine if two `PARCStopwatch` instances are equal. + * + * The following equivalence relations on non-null `PARCStopwatch` instances are maintained: * + * * It is reflexive: for any non-null reference value x, `parcStopwatch_Equals(x, x)` must return true. + * + * * It is symmetric: for any non-null reference values x and y, `parcStopwatch_Equals(x, y)` must return true if and only if + * `parcStopwatch_Equals(y x)` returns true. + * + * * It is transitive: for any non-null reference values x, y, and z, if + * `parcStopwatch_Equals(x, y)` returns true and + * `parcStopwatch_Equals(y, z)` returns true, + * then `parcStopwatch_Equals(x, z)` must return true. + * + * * It is consistent: for any non-null reference values x and y, multiple invocations of `parcStopwatch_Equals(x, y)` + * consistently return true or consistently return false. + * + * * For any non-null reference value x, `parcStopwatch_Equals(x, NULL)` must return false. + * + * @param [in] x A pointer to a valid PARCStopwatch instance. + * @param [in] y A pointer to a valid PARCStopwatch instance. + * + * @return true The instances x and y are equal. + * + * Example: + * @code + * { + * PARCStopwatch *a = parcStopwatch_Create(); + * PARCStopwatch *b = parcStopwatch_Create(); + * + * if (parcStopwatch_Equals(a, b)) { + * printf("Instances are equal.\n"); + * } + * + * parcStopwatch_Release(&a); + * parcStopwatch_Release(&b); + * } + * @endcode + * @see parcStopwatch_HashCode + */ +bool parcStopwatch_Equals(const PARCStopwatch *x, const PARCStopwatch *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 parcStopwatch_Equals} method, + * then calling the {@link parcStopwatch_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 parcStopwatch_Equals} function, + * then calling the `parcStopwatch_HashCode` + * method on each of the two objects must produce distinct integer results. + * + * @param [in] stopwatch A pointer to a valid PARCStopwatch instance. + * + * @return The hashcode for the given instance. + * + * Example: + * @code + * { + * PARCStopwatch *a = parcStopwatch_Create(); + * + * PARCHashCode hashValue = parcStopwatch_HashCode(buffer); + * parcStopwatch_Release(&a); + * } + * @endcode + */ +PARCHashCode parcStopwatch_HashCode(const PARCStopwatch *stopwatch); + +/** + * Determine if an instance of `PARCStopwatch` 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] stopwatch A pointer to a valid PARCStopwatch instance. + * + * @return true The instance is valid. + * @return false The instance is not valid. + * + * Example: + * @code + * { + * PARCStopwatch *a = parcStopwatch_Create(); + * + * if (parcStopwatch_IsValid(a)) { + * printf("Instance is valid.\n"); + * } + * + * parcStopwatch_Release(&a); + * } + * @endcode + * + */ +bool parcStopwatch_IsValid(const PARCStopwatch *stopwatch); + +/** + * Release a previously acquired reference to the given `PARCStopwatch` 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 + * { + * PARCStopwatch *a = parcStopwatch_Create(); + * + * parcStopwatch_Release(&a); + * } + * @endcode + */ +void parcStopwatch_Release(PARCStopwatch **instancePtr); + +/** + * Create a `PARCJSON` instance (representation) of the given object. + * + * @param [in] instance A pointer to a valid PARCStopwatch instance. + * + * @return NULL Memory could not be allocated to contain the `PARCJSON` instance. + * @return non-NULL An allocated C string that must be deallocated via parcMemory_Deallocate(). + * + * Example: + * @code + * { + * PARCStopwatch *a = parcStopwatch_Create(); + * + * PARCJSON *json = parcStopwatch_ToJSON(a); + * + * printf("JSON representation: %s\n", parcJSON_ToString(json)); + * parcJSON_Release(&json); + * + * parcStopwatch_Release(&a); + * } + * @endcode + */ +PARCJSON *parcStopwatch_ToJSON(const PARCStopwatch *stopwatch); + +/** + * Produce a null-terminated string representation of the specified `PARCStopwatch`. + * + * The result must be freed by the caller via {@link parcMemory_Deallocate}. + * + * @param [in] stopwatch A pointer to a valid PARCStopwatch instance. + * + * @return NULL Cannot allocate memory. + * @return non-NULL A pointer to an allocated, null-terminated C string that must be deallocated via {@link parcMemory_Deallocate}. + * + * Example: + * @code + * { + * PARCStopwatch *a = parcStopwatch_Create(); + * + * char *string = parcStopwatch_ToString(a); + * + * parcStopwatch_Release(&a); + * + * parcMemory_Deallocate(&string); + * } + * @endcode + * + * @see parcStopwatch_Display + */ +char *parcStopwatch_ToString(const PARCStopwatch *stopwatch); + +/** + * Start one or more PARCStopwatch instances. + * + * @param [in] stopwatch A pointer to a valid PARCStopwatch instance. + * @param [in] ... A variable argument list consisting of pointers to valid PARCStopwatch instances. + * + * Example: + * @code + * { + * PARCStopwatch *A = parcStopwatch_Create(); + * PARCStopwatch *B = parcStopwatch_Create(); + * PARCStopwatch *C = parcStopwatch_Create(); + * + * parcStopwatch_Start(A, B, C); + * + * } + * @endcode + */ +#define parcStopwatch_Start(...) parcStopwatch_StartImpl(__VA_ARGS__, NULL) + +/** + * Start one or more PARCStopwatch instances. + * + * @param [in] stopwatch A pointer to a valid PARCStopwatch instance. + * @param [in] ... A NULL termianted argument list consisting of pointers to valid PARCStopwatch instances. + * + * Example: + * @code + * { + * PARCStopwatch *stopWatch = parcStopwatch_Create(); + * parcStopwatch_StartImpl(stopWatch, NULL); + * } + * @endcode + */ +void parcStopwatch_StartImpl(PARCStopwatch *stopwatch, ...); + +/** + * Get the number of nanoseconds between the time the PARCStopwatch was started and the time of this function call. + * + * The accuracy is dependant upon the operating environment's time resolution. + * + * @param [in] stopwatch A pointer to a valid PARCStopwatch instance. + * + * @return The difference between the start and stop times nanoseconds. + * + * Example: + * @code + * { + * <#example#> + * } + * @endcode + */ +uint64_t parcStopwatch_ElapsedTimeNanos(PARCStopwatch *stopwatch); + +/** + * Get the number of microseconds between the time the PARCStopwatch was started and the time of this function call. + * + * The accuracy is dependant upon the operating environment's time resolution. + * + * @param [in] stopwatch A pointer to a valid PARCStopwatch instance. + * + * @return The difference between the start and stop times in microseconds. + * + * Example: + * @code + * { + * <#example#> + * } + * @endcode + */ +uint64_t parcStopwatch_ElapsedTimeMicros(PARCStopwatch *stopwatch); + +/** + * Get the number of milliseconds between the time the PARCStopwatch was started and the time of this function call. + * + * The accuracy is dependant upon the operating environment's time resolution. + * + * @param [in] stopwatch A pointer to a valid PARCStopwatch instance. + * + * @return The difference between the start and stop times in milliseconds. + * + * Example: + * @code + * { + * <#example#> + * } + * @endcode + */ +uint64_t parcStopwatch_ElapsedTimeMillis(PARCStopwatch *stopwatch); +#endif |