77 lines
2.9 KiB
C
77 lines
2.9 KiB
C
/******************************************************************************
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*
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* Copyright (C) 2014 Google, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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******************************************************************************/
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#ifndef _ALARM_H_
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#define _ALARM_H_
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#include <stdint.h>
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#include <freertos/FreeRTOS.h>
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#include <freertos/timers.h>
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typedef uint32_t period_ms_t;
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typedef void (*osi_alarm_callback_t)(void *data);
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#define ALARM_CBS_NUM 20
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#define ALARM_ID_BASE 1000
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typedef struct alarm_t {
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/* timer id point to here */
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TimerHandle_t alarm_hdl;
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osi_alarm_callback_t cb;
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void *cb_data;
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} osi_alarm_t;
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void osi_alarm_init(void);
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// Creates a new alarm object. The returned object must be freed by calling
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// |alarm_free|. Returns NULL on failure.
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osi_alarm_t *osi_alarm_new(char *alarm_name, osi_alarm_callback_t callback, void *data, period_ms_t timer_expire);
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// Frees an alarm object created by |alarm_new|. |alarm| may be NULL. If the
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// alarm is pending, it will be cancelled. It is not safe to call |alarm_free|
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// from inside the callback of |alarm|.
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int osi_alarm_free(osi_alarm_t *alarm);
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// Sets an alarm to fire |cb| after the given |deadline|. Note that |deadline| is the
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// number of milliseconds relative to the current time. |data| is a context variable
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// for the callback and may be NULL. |cb| will be called back in the context of an
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// unspecified thread (i.e. it will not be called back in the same thread as the caller).
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// |alarm| and |cb| may not be NULL.
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int osi_alarm_set(osi_alarm_t *alarm, period_ms_t timeout);
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// This function cancels the |alarm| if it was previously set. When this call
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// returns, the caller has a guarantee that the callback is not in progress and
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// will not be called if it hasn't already been called. This function is idempotent.
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// |alarm| may not be NULL.
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int osi_alarm_cancel(osi_alarm_t *alarm);
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period_ms_t osi_alarm_now(void);
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// Figure out how much time until next expiration.
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// Returns 0 if not armed. |alarm| may not be NULL.
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// TODO: Remove this function once PM timers can be re-factored
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period_ms_t osi_alarm_get_remaining_ms(const osi_alarm_t *alarm);
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// Alarm-related state cleanup
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//void alarm_cleanup(void);
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// Compute time difference (t1-t2) considering tick counter wrap
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// t1 and t2 should be no greater than the time of MAX ticks
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period_ms_t osi_alarm_time_diff(period_ms_t t1, period_ms_t t2);
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#endif /*_ALARM_H_*/
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