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38 lines
2.1 KiB
38 lines
2.1 KiB
// Copyright 2021 Nick Brassel (@tzarc)
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// SPDX-License-Identifier: GPL-2.0-or-later
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#pragma once
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#include <stdbool.h>
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#include <stdint.h>
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// A token that can be used to cancel an existing deferred execution.
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typedef uint8_t deferred_token;
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#define INVALID_DEFERRED_TOKEN 0
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// Callback to execute.
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// -- Parameter trigger_time: the intended trigger time to execute the callback -- equivalent time-space as timer_read32()
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// cb_arg: the callback argument specified when enqueueing the deferred executor
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// -- Return value: Non-zero re-queues the callback to execute after the returned number of milliseconds. Zero cancels repeated execution.
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typedef uint32_t (*deferred_exec_callback)(uint32_t trigger_time, void *cb_arg);
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// Configures the supplied deferred executor to be executed after the required number of milliseconds.
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// -- Parameter delay_ms: the number of milliseconds before executing the callback
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// -- callback: the executor to invoke
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// -- cb_arg: the argument to pass to the executor, may be NULL if unused by the executor
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// -- Return value: a token usable for cancellation, or INVALID_DEFERRED_TOKEN if an error occurred
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deferred_token defer_exec(uint32_t delay_ms, deferred_exec_callback callback, void *cb_arg);
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// Allows for extending the timeframe before an existing deferred execution is invoked.
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// -- Parameter token: the returned value from defer_exec for the deferred execution you wish to extend.
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// -- delay_ms: the new delay (with respect to the current time)
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// -- Return value: if the token was found, and the delay was extended
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bool extend_deferred_exec(deferred_token token, uint32_t delay_ms);
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// Allows for cancellation of an existing deferred execution.
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// -- Parameter token: the returned value from defer_exec for the deferred execution you wish to cancel.
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// -- Return value: if the token was found, and the executor was cancelled
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bool cancel_deferred_exec(deferred_token token);
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// Forward declaration for the main loop in order to execute any deferred executors. Should not be invoked by keyboard/user code.
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void deferred_exec_task(void);
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