65 lines
1.5 KiB
C++
65 lines
1.5 KiB
C++
/**
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* @file pubsub.h
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* PubSub
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*/
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#pragma once
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#include "Mutex.h"
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#include <list>
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namespace tt {
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/** PubSub Callback type */
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typedef void (*PubSubCallback)(const void* message, void* context);
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struct PubSubSubscription {
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uint64_t id;
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PubSubCallback callback;
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void* callback_context;
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};
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struct PubSub {
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typedef std::list<PubSubSubscription> Subscriptions;
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uint64_t last_id = 0;
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Subscriptions items;
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Mutex mutex;
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~PubSub() {
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tt_check(items.empty());
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}
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};
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/** Subscribe to PubSub
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*
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* Threadsafe, Reentrable
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*
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* @param pubsub pointer to PubSub instance
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* @param[in] callback The callback
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* @param callback_context The callback context
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*
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* @return pointer to PubSubSubscription instance
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*/
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PubSubSubscription*
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tt_pubsub_subscribe(std::shared_ptr<PubSub> pubsub, PubSubCallback callback, void* callback_context);
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/** Unsubscribe from PubSub
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*
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* No use of `pubsub_subscription` allowed after call of this method
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* Threadsafe, Reentrable.
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*
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* @param pubsub pointer to PubSub instance
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* @param pubsub_subscription pointer to PubSubSubscription instance
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*/
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void tt_pubsub_unsubscribe(std::shared_ptr<PubSub> pubsub, PubSubSubscription* pubsub_subscription);
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/** Publish message to PubSub
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*
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* Threadsafe, Reentrable.
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*
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* @param pubsub pointer to PubSub instance
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* @param message message pointer to publish
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*/
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void tt_pubsub_publish(std::shared_ptr<PubSub> pubsub, void* message);
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} // namespace
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