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/*
* IoT Platform V1.1.0
* Copyright (C) 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
* the Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/**
* @file iot_clock.h
* @brief Time-related functions used by libraries in this SDK.
*/
#ifndef IOT_CLOCK_H_
#define IOT_CLOCK_H_
/* The config header is always included first. */
#include "iot_config.h"
/* Standard includes. */
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
/* Platform layer types include. */
#include "types/iot_platform_types.h"
/**
* @functionspage{platform_clock,platform clock component,Clock}
* - @functionname{platform_clock_function_gettimestring}
* - @functionname{platform_clock_function_gettimems}
* - @functionname{platform_clock_function_sleepms}
* - @functionname{platform_clock_function_timercreate}
* - @functionname{platform_clock_function_timerdestroy}
* - @functionname{platform_clock_function_timerarm}
*/
/**
* @functionpage{IotClock_GetTimestring,platform_clock,gettimestring}
* @functionpage{IotClock_GetTimeMs,platform_clock,gettimems}
* @functionpage{IotClock_SleepMs,platform_clock,sleepms}
* @functionpage{IotClock_TimerCreate,platform_clock,timercreate}
* @functionpage{IotClock_TimerDestroy,platform_clock,timerdestroy}
* @functionpage{IotClock_TimerArm,platform_clock,timerarm}
*/
/**
* @brief Generates a human-readable timestring, such as "01 Jan 2018 12:00".
*
* This function uses the system clock to generate a human-readable timestring.
* This timestring is printed by the [logging functions](@ref logging_functions).
*
* @param[out] pBuffer A buffer to store the timestring in.
* @param[in] bufferSize The size of `pBuffer`.
* @param[out] pTimestringLength The actual length of the timestring stored in
* `pBuffer`.
*
* @return `true` if a timestring was successfully generated; `false` otherwise.
*
* @warning The implementation of this function must not call any [logging functions]
* (@ref logging_functions).
*
* <b>Example</b>
* @code{c}
* char timestring[ 32 ];
* size_t timestringLength = 0;
*
* if( IotClock_GetTimestring( timestring, 32, ×tringLength ) == true )
* {
* printf( "Timestring: %.*s", timestringLength, timestring );
* }
* @endcode
*/
/* @[declare_platform_clock_gettimestring] */
bool IotClock_GetTimestring( char * pBuffer,
size_t bufferSize,
size_t * pTimestringLength );
/* @[declare_platform_clock_gettimestring] */
/**
* @brief Returns a nonzero, monotonically-increasing system time in milliseconds.
*
* This function reads a millisecond-resolution system clock. The clock should
* always be monotonically-increasing; therefore, real-time clocks that may be
* set by another process are not suitable for this function's implementation.
*
* @return The value of the system clock. This function is not expected to fail.
*
* <b>Example</b>
* @code{c}
* // Get current time.
* uint64_t currentTime = IotClock_GetTimeMs();
* @endcode
*/
/* @[declare_platform_clock_gettimems] */
uint64_t IotClock_GetTimeMs( void );
/* @[declare_platform_clock_gettimems] */
/**
* @brief Delay for the given number of milliseconds.
*
* This function suspends its calling thread for at least `sleepTimeMs` milliseconds.
*
* @param[in] sleepTimeMs Sleep time (in milliseconds).
*/
/* @[declare_platform_clock_sleepms] */
void IotClock_SleepMs( uint32_t sleepTimeMs );
/* @[declare_platform_clock_sleepms] */
/**
* @brief Create a new timer.
*
* This function creates a new, unarmed timer. It must be called on an uninitialized
* #IotTimer_t. This function must not be called on an already-initialized #IotTimer_t.
*
* @param[out] pNewTimer Set to a new timer handle on success.
* @param[in] expirationRoutine The function to run when this timer expires. This
* function should be called in its own <i>detached</i> thread.
* @param[in] pArgument The argument to pass to `expirationRoutine`.
*
* @return `true` if the timer is successfully created; `false` otherwise.
*
* @see @ref platform_clock_function_timerdestroy, @ref platform_clock_function_timerarm
*/
/* @[declare_platform_clock_timercreate] */
bool IotClock_TimerCreate( IotTimer_t * pNewTimer,
IotThreadRoutine_t expirationRoutine,
void * pArgument );
/* @[declare_platform_clock_timercreate] */
/**
* @brief Free resources used by a timer.
*
* This function frees resources used by a timer. It must be called on an initialized
* #IotTimer_t. No other timer functions should be called on `pTimer` after calling
* this function (unless the timer is re-created).
*
* This function will stop the `pTimer` if it is armed.
*
* @param[in] pTimer The timer to destroy.
*
* @see @ref platform_clock_function_timercreate, @ref platform_clock_function_timerarm
*/
/* @[declare_platform_clock_timerdestroy] */
void IotClock_TimerDestroy( IotTimer_t * pTimer );
/* @[declare_platform_clock_timerdestroy] */
/**
* @brief Arm a timer to expire at the given relative timeout.
*
* This function arms a timer to run its expiration routine at the given time.
*
* If `periodMs` is nonzero, the timer should expire periodically at intervals
* such as:
* - `relativeTimeoutMs`
* - `relativeTimeoutMs + periodMs`
* - `relativeTimeoutMs + 2 * periodMs`
* - Etc. (subject to some jitter).
*
* Setting `periodMs` to `0` arms a one-shot, non-periodic timer.
*
* @param[in] pTimer The timer to arm.
* @param[in] relativeTimeoutMs When the timer should expire, relative to the time
* this function is called.
* @param[in] periodMs How often the timer should expire again after `relativeTimerMs`.
*
* @return `true` if the timer was successfully armed; `false` otherwise.
*
* @see @ref platform_clock_function_timercreate, @ref platform_clock_function_timerdestroy
*
* <b>Example</b>
* @code{c}
*
* void timerExpirationRoutine( void * pArgument );
*
* void timerExample( void )
* {
* IotTimer_t timer;
*
* if( IotClock_TimerCreate( &timer, timerExpirationRoutine, NULL ) == true )
* {
* // Set the timer to periodically expire every 10 seconds.
* if( IotClock_TimerArm( &timer, 10000, 10000 ) == true )
* {
* // Wait for timer to expire.
* }
*
* IotClock_TimerDestroy( &timer );
* }
* }
* @endcode
*/
/* @[declare_platform_clock_timerarm] */
bool IotClock_TimerArm( IotTimer_t * pTimer,
uint32_t relativeTimeoutMs,
uint32_t periodMs );
/* @[declare_platform_clock_timerarm] */
#endif /* ifndef IOT_CLOCK_H_ */
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