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/* Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef CRAS_TM_H_
#define CRAS_TM_H_
/* cras_timer provides an interface to register a function to be called at a
* later time. This interface should be used from the main thread only, it is
* not thread safe.
*/
struct cras_tm; /* timer manager */
struct cras_timer;
/* Creates a timer. Must later be removed with cras_rm_cancel_timer.
* Args:
* tm - Timer manager.
* ms - Call 'cb' in ms milliseconds.
* cb - The callback to call at timeout.
* cb_data - Passed to the callback when it is run.
* Returns:
* Pointer to a newly allocated timer, passed timer to cras_tm_cancel_timer
* to cancel before it fires.
*/
struct cras_timer *cras_tm_create_timer(struct cras_tm *tm, unsigned int ms,
void (*cb)(struct cras_timer *t,
void *data),
void *cb_data);
/* Deletes a timer returned from cras_tm_create_timer. */
void cras_tm_cancel_timer(struct cras_tm *tm, struct cras_timer *t);
/* Interface for system to create the timer manager. */
struct cras_tm *cras_tm_init();
/* Interface for system to destroy the timer manager. */
void cras_tm_deinit(struct cras_tm *tm);
/* Get the amount of time before the next timer expires. ts is set to an
* the amount of time before the next timer expires (0 if already past due).
* Args:
* tm - Timer manager.
* ts - Filled with time before next event.
* Returns:
* 0 if no timers are active, 1 if they are.
*/
int cras_tm_get_next_timeout(const struct cras_tm *tm, struct timespec *ts);
/* Calls any expired timers. */
void cras_tm_call_callbacks(struct cras_tm *tm);
#endif /* CRAS_TM_H_ */
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