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/* Copyright 2015 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.
*
* Queue policies.
*/
#ifndef __CROS_EC_QUEUE_POLICIES_H
#define __CROS_EC_QUEUE_POLICIES_H
#include "queue.h"
#include "consumer.h"
#include "producer.h"
/*
* The direct notification policy manages a 1-to-1 producer consumer model.
* When new units are added to the queue the consumer is notified directly, in
* whatever context (interrupt, deferred, task...) that the queue addition
* happened. Similarly, queue removals directly notify the producer.
*/
struct queue_policy_direct {
struct queue_policy policy;
struct producer const *producer;
struct consumer const *consumer;
};
void queue_add_direct(struct queue_policy const *policy, size_t count);
void queue_remove_direct(struct queue_policy const *policy, size_t count);
#define QUEUE_POLICY_DIRECT(PRODUCER, CONSUMER) \
((struct queue_policy_direct const) { \
.policy = { \
.add = queue_add_direct, \
.remove = queue_remove_direct, \
}, \
.producer = &PRODUCER, \
.consumer = &CONSUMER, \
})
#define QUEUE_DIRECT(SIZE, TYPE, PRODUCER, CONSUMER) \
QUEUE(SIZE, TYPE, QUEUE_POLICY_DIRECT(PRODUCER, CONSUMER).policy)
/*
* The null_producer and null_consumer are useful when constructing a queue
* where one end needs notification, but the other end doesn't care. These
* producer and consumer structs just ignore all notifications.
*/
extern struct producer const null_producer;
extern struct consumer const null_consumer;
#endif /* __CROS_EC_QUEUE_POLICIES_H */
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