mirror of
https://github.com/obgm/libcoap.git
synced 2026-11-04 08:55:40 +03:00
Olaf Bergmann
60421db0a5
This change adds 'SPDX-License-Identifier: BSD-2-Clause' [1] to the source code files that originate in the libcoap project. Note that not all files are tagged because they are pulled in from other sources and thus may fall under a different license. More information about these is contained in the LICENSE file. [1] https://spdx.org/licenses/BSD-2-Clause.html
117 lines
3.4 KiB
C
117 lines
3.4 KiB
C
/*
|
|
* async.h -- state management for asynchronous messages
|
|
*
|
|
* Copyright (C) 2010-2011 Olaf Bergmann <bergmann@tzi.org>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*
|
|
* This file is part of the CoAP library libcoap. Please see README for terms
|
|
* of use.
|
|
*/
|
|
|
|
/**
|
|
* @file async.h
|
|
* @brief State management for asynchronous messages
|
|
*/
|
|
|
|
#ifndef COAP_ASYNC_H_
|
|
#define COAP_ASYNC_H_
|
|
|
|
#include "net.h"
|
|
|
|
/**
|
|
* @defgroup coap_async Asynchronous Messaging
|
|
* @{
|
|
* API functions for Async "separate" messages.
|
|
* A coap_context_t object holds a list of coap_async_t objects that can
|
|
* be used to generate a separate response in the case a result of a request
|
|
* cannot be delivered immediately.
|
|
*/
|
|
|
|
/**
|
|
* Returns @c 1 if libcoap was built with separate messages enabled,
|
|
* @c 0 otherwise.
|
|
*/
|
|
int coap_async_is_supported(void);
|
|
|
|
/**
|
|
* Allocates a new coap_async_t object and fills its fields according to
|
|
* the given @p request. This function returns a pointer to the registered
|
|
* coap_async_t object or @c NULL on error. Note that this function will
|
|
* return @c NULL in case that an object with the same identifier is already
|
|
* registered.
|
|
*
|
|
* When the delay expires, a copy of the @p request will get sent to the
|
|
* appropriate request handler.
|
|
*
|
|
* @param session The session that is used for asynchronous transmissions.
|
|
* @param request The request that is handled asynchronously.
|
|
* @param delay The amount of time to delay before sending response, 0 means
|
|
* wait forever.
|
|
*
|
|
* @return A pointer to the registered coap_async_t object or @c
|
|
* NULL in case of an error.
|
|
*/
|
|
coap_async_t *
|
|
coap_register_async(coap_session_t *session,
|
|
const coap_pdu_t *request,
|
|
coap_tick_t delay);
|
|
|
|
/**
|
|
* Update the delay timeout, so changing when the registered @p async triggers.
|
|
*
|
|
* When the new delay expires, a copy of the original request will get sent to
|
|
* the appropriate request handler.
|
|
*
|
|
* @param async The object to update.
|
|
* @param delay The amount of time to delay before sending response, 0 means
|
|
* wait forever.
|
|
*/
|
|
void
|
|
coap_async_set_delay(coap_async_t *async, coap_tick_t delay);
|
|
|
|
/**
|
|
* Releases the memory that was allocated by coap_register_async() for the
|
|
* object @p async.
|
|
*
|
|
* @param session The session to use.
|
|
* @param async The object to delete.
|
|
*/
|
|
void
|
|
coap_free_async(coap_session_t *session, coap_async_t *async);
|
|
|
|
/**
|
|
* Retrieves the object identified by @p token from the list of asynchronous
|
|
* transactions that are registered with @p context. This function returns a
|
|
* pointer to that object or @c NULL if not found.
|
|
*
|
|
* @param session The session that is used for asynchronous transmissions.
|
|
* @param token The PDU's token of the object to retrieve.
|
|
*
|
|
* @return A pointer to the object identified by @p token or @c NULL if
|
|
* not found.
|
|
*/
|
|
coap_async_t *coap_find_async(coap_session_t *session, coap_bin_const_t token);
|
|
|
|
/**
|
|
* Set the application data pointer held in @p async. This overwrites any
|
|
* existing data pointer.
|
|
*
|
|
* @param async The async state object.
|
|
* @param app_data The pointer to the data.
|
|
*/
|
|
void coap_async_set_app_data(coap_async_t *async, void *app_data);
|
|
|
|
/**
|
|
* Gets the application data pointer held in @p async.
|
|
*
|
|
* @param async The async state object.
|
|
*
|
|
* @return The applicaton data pointer.
|
|
*/
|
|
void *coap_async_get_app_data(const coap_async_t *async);
|
|
|
|
/** @} */
|
|
|
|
#endif /* COAP_ASYNC_H_ */
|