106 lines
4.5 KiB
C
106 lines
4.5 KiB
C
/******************************************************************************
|
||
*
|
||
* Copyright 2014 Google, Inc.
|
||
*
|
||
* 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.
|
||
*
|
||
******************************************************************************/
|
||
|
||
#pragma once
|
||
|
||
#include <stdbool.h>
|
||
#include <stdint.h>
|
||
|
||
typedef struct alarm_t alarm_t;
|
||
typedef struct fixed_queue_t fixed_queue_t;
|
||
typedef struct thread_t thread_t;
|
||
|
||
// Prototype for the alarm callback function.
|
||
typedef void (*alarm_callback_t)(void* data);
|
||
|
||
// Creates a new one-time off alarm object with user-assigned
|
||
// |name|. |name| may not be NULL, and a copy of the string will
|
||
// be stored internally. The value of |name| has no semantic
|
||
// meaning. It is recommended that the name is unique (for
|
||
// better debuggability), but that is not enforced. The returned
|
||
// object must be freed by calling |alarm_free|. Returns NULL on
|
||
// failure.
|
||
alarm_t* alarm_new(const char* name);
|
||
|
||
// Creates a new periodic alarm object with user-assigned |name|.
|
||
// |name| may not be NULL, and a copy of the string will be
|
||
// stored internally. The value of |name| has no semantic
|
||
// meaning. It is recommended that the name is unique (for better
|
||
// debuggability), but that is not enforced. The returned object
|
||
// must be freed by calling |alarm_free|. Returns NULL on
|
||
// failure.
|
||
alarm_t* alarm_new_periodic(const char* name);
|
||
|
||
// Frees an |alarm| object created by |alarm_new| or
|
||
// |alarm_new_periodic|. |alarm| may be NULL. If the alarm is
|
||
// pending, it will be cancelled first. It is not safe to call
|
||
// |alarm_free| from inside the callback of |alarm|.
|
||
void alarm_free(alarm_t* alarm);
|
||
|
||
// Sets an |alarm| to execute a callback in the future. The |cb|
|
||
// callback is called after the given |interval_ms|, where
|
||
// |interval_ms| is the number of milliseconds relative to the
|
||
// current time. If |alarm| was created with
|
||
// |alarm_new_periodic|, the alarm is scheduled to fire
|
||
// periodically every |interval_ms|, otherwise it is a one time
|
||
// only alarm. A periodic alarm repeats every |interval_ms| until
|
||
// it is cancelled or freed. When the alarm fires, the |cb|
|
||
// callback is called with the context argument |data|:
|
||
//
|
||
// void cb(void *data) {...}
|
||
//
|
||
// The |data| argument may be NULL, but the |cb| callback may not
|
||
// be NULL. All |cb| callbacks scheduled through this call are
|
||
// called within a single (internally created) thread. That
|
||
// thread is not same as the caller’s thread. If two (or more)
|
||
// alarms are set back-to-back with the same |interval_ms|, the
|
||
// callbacks will be called in the order the alarms are set.
|
||
void alarm_set(alarm_t* alarm, uint64_t interval_ms, alarm_callback_t cb,
|
||
void* data);
|
||
|
||
// Sets an |alarm| to execute a callback in the main message loop. This function
|
||
// is same as |alarm_set| except that the |cb| callback is scheduled for
|
||
// execution in the context of the main message loop.
|
||
void alarm_set_on_mloop(alarm_t* alarm, uint64_t interval_ms,
|
||
alarm_callback_t cb, void* data);
|
||
|
||
// This function cancels the |alarm| if it was previously set.
|
||
// When this call returns, the caller has a guarantee that the
|
||
// callback is not in progress and will not be called if it
|
||
// hasn't already been called. This function is idempotent.
|
||
// |alarm| may not be NULL.
|
||
void alarm_cancel(alarm_t* alarm);
|
||
|
||
// Tests whether the |alarm| is scheduled.
|
||
// Return true if the |alarm| is scheduled or NULL, otherwise false.
|
||
bool alarm_is_scheduled(const alarm_t* alarm);
|
||
|
||
// Figure out how much time until next expiration.
|
||
// Returns 0 if not armed. |alarm| may not be NULL.
|
||
// TODO: Remove this function once PM timers can be re-factored
|
||
uint64_t alarm_get_remaining_ms(const alarm_t* alarm);
|
||
|
||
// Cleanup the alarm internal state.
|
||
// This function should be called by the OSI module cleanup during
|
||
// graceful shutdown.
|
||
void alarm_cleanup(void);
|
||
|
||
// Dump alarm-related statistics and debug info to the |fd| file descriptor.
|
||
// The information is in user-readable text format. The |fd| must be valid.
|
||
void alarm_debug_dump(int fd);
|