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/* Copyright (c) 2001, Matej Pfajfar.
* Copyright (c) 2001-2004, Roger Dingledine.
* Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
* Copyright (c) 2007-2020, The Tor Project, Inc. */
/* See LICENSE for licensing information */
/**
* @file mainloop_pubsub.h
* @brief Header for mainloop_pubsub.c
**/
#ifndef TOR_MAINLOOP_PUBSUB_H
#define TOR_MAINLOOP_PUBSUB_H
struct pubsub_builder_t;
/**
* Describe when and how messages are delivered on message channel.
*
* Every message channel must be associated with one of these strategies.
**/
typedef enum {
/**
* Never deliver messages automatically.
*
* If a message channel uses this strategy, then no matter now many
* messages are published on it, they are not delivered until something
* manually calls dispatch_flush() for that channel
**/
DELIV_NEVER=0,
/**
* Deliver messages promptly, via the event loop.
*
* If a message channel uses this strategy, then publishing a messages
* that channel activates an event that causes messages to be handled
* later in the mainloop. The messages will be processed at some point
* very soon, delaying only for pending IO events and the like.
*
* Generally this is the best choice for a delivery strategy, since
* it avoids stack explosion.
**/
DELIV_PROMPT,
/**
* Deliver messages immediately, skipping the event loop.
*
* Every event on this channel is flushed immediately after it is queued,
* using the stack.
*
* This delivery type should be used with caution, since it can cause
* unexpected call chains, resource starvation, and the like.
**/
DELIV_IMMEDIATE,
} deliv_strategy_t;
int tor_mainloop_connect_pubsub(struct pubsub_builder_t *builder);
void tor_mainloop_connect_pubsub_events(void);
int tor_mainloop_set_delivery_strategy(const char *msg_channel_name,
deliv_strategy_t strategy);
void tor_mainloop_disconnect_pubsub(void);
#endif /* !defined(TOR_MAINLOOP_PUBSUB_H) */
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