forked from cory/tildefriends
Cory McWilliams
f908b45cc7
git-svn-id: https://www.unprompted.com/svn/projects/tildefriends/trunk@4644 ed5197a5-7fde-0310-b194-c3ffbd925b24
164 lines
5.0 KiB
C
164 lines
5.0 KiB
C
/*
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* Copyright 2022-2023 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#ifndef OSSL_INTERNAL_EVENT_QUEUE_H
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# define OSSL_INTERNAL_EVENT_QUEUE_H
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# pragma once
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# include "internal/priority_queue.h"
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# include "internal/time.h"
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/*
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* Opaque type holding an event.
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*/
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typedef struct ossl_event_st OSSL_EVENT;
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DEFINE_PRIORITY_QUEUE_OF(OSSL_EVENT);
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/*
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* Public type representing an event queue, the underlying structure being
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* opaque.
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*/
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typedef struct ossl_event_queue_st OSSL_EVENT_QUEUE;
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/*
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* Public type representing a event queue entry.
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* It is (internally) public so that it can be embedded into other structures,
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* it should otherwise be treated as opaque.
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*/
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struct ossl_event_st {
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uint32_t type; /* What type of event this is */
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uint32_t priority; /* What priority this event has */
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OSSL_TIME when; /* When the event is scheduled to happen */
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void *ctx; /* User argument passed to call backs */
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void *payload; /* Event specific data of unknown kind */
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size_t payload_size; /* Length (in bytes) of event specific data */
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/* These fields are for internal use only */
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PRIORITY_QUEUE_OF(OSSL_EVENT) *queue; /* Queue containing this event */
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size_t ref; /* ID for this event */
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unsigned int flag_dynamic : 1; /* Malloced or not? */
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};
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/*
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* Utility function to populate an event structure and add it to the queue
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*/
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int ossl_event_queue_add(OSSL_EVENT_QUEUE *queue, OSSL_EVENT *event,
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uint32_t type, uint32_t priority,
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OSSL_TIME when, void *ctx,
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void *payload, size_t payload_size);
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/*
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* Utility functions to extract event fields
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*/
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static ossl_unused ossl_inline
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uint32_t ossl_event_get_type(const OSSL_EVENT *event)
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{
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return event->type;
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}
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static ossl_unused ossl_inline
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uint32_t ossl_event_get_priority(const OSSL_EVENT *event)
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{
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return event->priority;
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}
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static ossl_unused ossl_inline
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OSSL_TIME ossl_event_get_when(const OSSL_EVENT *event)
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{
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return event->when;
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}
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static ossl_unused ossl_inline
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void *ossl_event_get0_ctx(const OSSL_EVENT *event)
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{
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return event->ctx;
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}
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static ossl_unused ossl_inline
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void *ossl_event_get0_payload(const OSSL_EVENT *event, size_t *length)
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{
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if (length != NULL)
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*length = event->payload_size;
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return event->payload;
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}
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/*
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* Create and free a queue.
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*/
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OSSL_EVENT_QUEUE *ossl_event_queue_new(void);
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void ossl_event_queue_free(OSSL_EVENT_QUEUE *queue);
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/*
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* Schedule a new event into an event queue.
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*
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* The event parameters are taken from the function arguments.
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*
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* The function returns NULL on failure and the added event on success.
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*/
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OSSL_EVENT *ossl_event_queue_add_new(OSSL_EVENT_QUEUE *queue,
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uint32_t type, uint32_t priority,
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OSSL_TIME when, void *ctx,
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void *payload, size_t payload_size)
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;
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/*
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* Schedule an event into an event queue.
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*
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* The event parameters are taken from the function arguments.
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*
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* The function returns 0 on failure and 1 on success.
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*/
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int ossl_event_queue_add(OSSL_EVENT_QUEUE *queue, OSSL_EVENT *event,
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uint32_t type, uint32_t priority,
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OSSL_TIME when, void *ctx,
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void *payload, size_t payload_size);
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/*
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* Delete an event from the queue.
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* This will cause the early deletion function to be called if it is non-NULL.
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* A pointer to the event structure is returned.
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*/
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int ossl_event_queue_remove(OSSL_EVENT_QUEUE *queue, OSSL_EVENT *event);
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/*
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* Free a dynamic event.
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* Is a NOP for a static event.
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*/
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void ossl_event_free(OSSL_EVENT *event);
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/*
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* Return the time until the next event for the specified event, if the event's
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* time is past, zero is returned. Once activated, the event reference becomes
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* invalid and this function becomes undefined.
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*/
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OSSL_TIME ossl_event_time_until(const OSSL_EVENT *event);
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/*
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* Return the time until the next event in the queue.
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* If the next event is in the past, zero is returned.
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*/
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OSSL_TIME ossl_event_queue_time_until_next(const OSSL_EVENT_QUEUE *queue);
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/*
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* Postpone an event to trigger at the specified time.
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* If the event has triggered, this function's behaviour is undefined.
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*/
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int ossl_event_queue_postpone_until(OSSL_EVENT_QUEUE *queue,
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OSSL_EVENT *event,
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OSSL_TIME when);
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/*
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* Return the next event to process.
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*/
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int ossl_event_queue_get1_next_event(OSSL_EVENT_QUEUE *queue,
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OSSL_EVENT **event);
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#endif
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