mirror of
https://github.com/openssl/openssl.git
synced 2024-12-15 06:01:37 +08:00
45ada6b92b
3.1 has been decided to be a FIPS 140-3 release, springing from the branch openssl-3.0, and the master branch to continue with the development of OpenSSL 3.2. Reviewed-by: Matthias St. Pierre <Matthias.St.Pierre@ncp-e.com> Reviewed-by: Tim Hudson <tjh@openssl.org> (Merged from https://github.com/openssl/openssl/pull/19350)
126 lines
4.7 KiB
Plaintext
126 lines
4.7 KiB
Plaintext
=pod
|
|
|
|
=head1 NAME
|
|
|
|
DEFINE_PRIORITY_QUEUE_OF, PRIORITY_QUEUE_OF,
|
|
ossl_pqueue_TYPE_num,
|
|
ossl_pqueue_TYPE_new, ossl_pqueue_TYPE_free, ossl_pqueue_TYPE_pop_free,
|
|
ossl_pqueue_TYPE_reserve,
|
|
ossl_pqueue_TYPE_push, ossl_pqueue_TYPE_peek,
|
|
ossl_pqueue_TYPE_pop, ossl_pqueue_TYPE_remove
|
|
- priority queue container
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
=for openssl generic
|
|
|
|
#include "internal/priority_queue.h"
|
|
|
|
PRIORITY_QUEUE_OF(type);
|
|
|
|
DEFINE_PRIORITY_QUEUE_OF(NAME, TYPE)
|
|
|
|
size_t ossl_pqueue_TYPE_num(const PRIORITY_QUEUE_OF(type) *pq);
|
|
PRIORITY_QUEUE_OF(type) *ossl_pqueue_TYPE_new(int (*compare)(const type *,
|
|
const type *));
|
|
void ossl_pqueue_TYPE_free(PRIORITY_QUEUE_OF(type) *pq);
|
|
void ossl_pqueue_TYPE_pop_free(PRIORITY_QUEUE_OF(type) *pq,
|
|
void (*free_func)(type *));
|
|
int ossl_pqueue_TYPE_reserve(PRIORITY_QUEUE_OF(type) *pq, size_t n);
|
|
int ossl_pqueue_TYPE_push(PRIORITY_QUEUE_OF(type) *pq, type *data,
|
|
size_t *elem);
|
|
type *ossl_pqueue_TYPE_peek(const PRIORITY_QUEUE_OF(type) *pq);
|
|
type *ossl_pqueue_TYPE_pop(const PRIORITY_QUEUE_OF(type) *pq);
|
|
type *ossl_pqueue_TYPE_remove(const PRIORITY_QUEUE_OF(type) *pq, size_t elem);
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
Create a type safe priority queue container. These macros define typesafe
|
|
inline functions that wrap internal routines. In the description here,
|
|
B<I<TYPE>> is used as a placeholder for any datatype.
|
|
|
|
The PRIORITY_QUEUE_OF() macro returns the name for a priority queue
|
|
of the specified B<I<TYPE>>. This is an opaque pointer to a structure
|
|
declaration.
|
|
|
|
DEFINE_PRIORITY_QUEUE_OF() creates a set of functions for a
|
|
priority queue of B<I<TYPE>> elements. The type is represented by
|
|
B<PRIORITY_QUEUE_OF>(B<I<TYPE>>) and each function name begins with
|
|
B<ossl_pqueue_I<TYPE>_>.
|
|
|
|
B<ossl_pqueue_I<TYPE>_num>() returns the number of elements in I<pq>
|
|
or B<0> if I<pq> is NULL.
|
|
|
|
B<ossl_pqueue_I<TYPE>_new>() allocates a new priority queue using
|
|
comparison function I<compare>. It is an error for I<compare> to be NULL.
|
|
The I<compare> function is called to order two elements, it should return
|
|
B<-1> if the first element is less than the second, B<0> if they are
|
|
equal and B<1> otherwise.
|
|
|
|
B<ossl_pqueue_I<TYPE>_free>() frees up the I<pq> structure. It does I<not>
|
|
free up any elements of I<pq>. After this call I<pq> is no longer valid.
|
|
|
|
B<ossl_pqueue_I<TYPE>_pop_free>() frees up all elements of I<pq> and I<pq>
|
|
itself. The free function freefunc() is called on each element to free it.
|
|
After this call I<pq> is no longer valid.
|
|
|
|
B<ossl_pqueue_I<TYPE>_reserve>() allocates additional memory in the I<pq>
|
|
structure such that the next I<n> calls to B<ossl_pqueue_I<TYPE>_push>()
|
|
will not fail or cause memory to be allocated or reallocated. If I<n>
|
|
is zero, no additional space is reserved. On error I<pq> is unchanged.
|
|
|
|
B<ossl_pqueue_I<TYPE>_push>() inserts a new element with value I<data>
|
|
into the priority queue I<pq>. If not NULL, the function returns an index
|
|
in B<*elem> which can be used to identify the element when calling
|
|
B<ossl_pqueue_I<TYPE>_remove>().
|
|
|
|
B<ossl_pqueue_I<TYPE>_peek>() returns the data from the smallest element
|
|
in I<pq>.
|
|
|
|
B<ossl_pqueue_I<TYPE>_pop>() returns the data from the smallest element
|
|
in I<pq> and removes that element from the priority queue.
|
|
|
|
B<ossl_pqueue_I<TYPE>_remove>() returns and removes the specified element
|
|
I<elem> from I<pq>. The index I<elem> must have been obtained from
|
|
an earlier call made to B<ossl_pqueue_I<TYPE>_push>() with the same I<pq>
|
|
argument. The index I<elem> is invalidated by this function. It is undefined
|
|
what happens if an attempt to remove an element that isn't in the queue is
|
|
made.
|
|
|
|
=head1 RETURN VALUES
|
|
|
|
B<ossl_pqueue_I<TYPE>_num>() returns the number of elements in the
|
|
priority queue or B<0> if the passed priority queue is NULL.
|
|
|
|
B<ossl_pqueue_I<TYPE>_new>() returns an empty priority queue or NULL if
|
|
an error occurs.
|
|
|
|
B<ossl_pqueue_I<TYPE>_free>() and B<ossl_pqueue_I<TYPE>_pop_free>()
|
|
do not return values.
|
|
|
|
B<ossl_pqueue_I<TYPE>_reserve>() returns B<1> on successful allocation
|
|
of the required memory or B<0> on error.
|
|
|
|
B<ossl_pqueue_I<TYPE>_push>() returns B<1> on success or B<0> on error.
|
|
|
|
B<ossl_pqueue_I<TYPE>_peek>() and B<ossl_pqueue_I<TYPE>_pop>() return
|
|
the data from the smallest element in the priority queue.
|
|
|
|
B<ossl_pqueue_I<TYPE>_remove>() returns the data from the specified
|
|
element.
|
|
|
|
=head1 HISTORY
|
|
|
|
The functions described here were all added in OpenSSL 3.2.
|
|
|
|
=head1 COPYRIGHT
|
|
|
|
Copyright 2022 The OpenSSL Project Authors. All Rights Reserved.
|
|
|
|
Licensed under the Apache License 2.0 (the "License"). You may not use
|
|
this file except in compliance with the License. You can obtain a copy
|
|
in the file LICENSE in the source distribution or at
|
|
L<https://www.openssl.org/source/license.html>.
|
|
|
|
=cut
|