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//
// Copyright 2018 Staysail Systems, Inc. <info@staysail.tech>
// Copyright 2018 Capitar IT Group BV <info@capitar.com>
//
// This software is supplied under the terms of the MIT License, a
// copy of which should be located in the distribution where this
// file was obtained (LICENSE.txt). A copy of the license may also be
// found online at https://opensource.org/licenses/MIT.
//
#ifndef CORE_IDHASH_H
#define CORE_IDHASH_H
#include "core/defs.h"
// We find that we often want to have a list of things listed by a
// numeric ID, which is generally monotonically increasing. This is
// most often a pipe ID. To help keep collections of these things
// indexed by their ID (which might start from a very large value),
// we offer a hash table. The hash table uses open addressing, but
// we use a better probe (taken from Python) to avoid hitting the same
// positions. Our hash algorithm is just the low order bits, and we
// use table sizes that are powers of two. Note that hash items
// must be non-NULL. The table is protected by an internal lock.
typedef struct nni_idhash nni_idhash;
typedef struct nni_idhash_entry nni_idhash_entry;
extern int nni_idhash_init(nni_idhash **);
extern void nni_idhash_fini(nni_idhash *);
extern void nni_idhash_set_limits(nni_idhash *, uint64_t, uint64_t, uint64_t);
extern int nni_idhash_find(nni_idhash *, uint64_t, void **);
extern int nni_idhash_remove(nni_idhash *, uint64_t);
extern int nni_idhash_insert(nni_idhash *, uint64_t, void *);
extern int nni_idhash_alloc(nni_idhash *, uint64_t *, void *);
extern size_t nni_idhash_count(nni_idhash *);
#endif // CORE_IDHASH_H
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