text: /*-
   * Copyright (c) 2006 Verdens Gang AS
   * Copyright (c) 2006-2015 Varnish Software AS
   * All rights reserved.
   *
   * Author: Poul-Henning Kamp <phk@phk.freebsd.dk>
   *
   * SPDX-License-Identifier: BSD-2-Clause
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   *
   */
  
  struct worker;
  struct objhead;
  
  typedef void hash_init_f(int ac, char * const *av);
  typedef void hash_start_f(void);
  typedef void hash_prep_f(struct worker *);
  typedef struct objhead *hash_lookup_f(struct worker *, const void *digest,
      struct objhead **);
  typedef int hash_deref_f(struct worker *, struct objhead *);
  
  struct hash_slinger {
  	unsigned		magic;
  #define SLINGER_MAGIC		0x1b720cba
  	const char		*name;
  	hash_init_f		*init;
  	hash_start_f		*start;
  	hash_prep_f		*prep;
  	hash_lookup_f		*lookup;
  	hash_deref_f		*deref;
  };
  
  enum lookup_e {
  	HSH_CONTINUE,
  	HSH_MISS,
  	HSH_BUSY,
  	HSH_HIT,
  	HSH_HITMISS,
  	HSH_HITPASS,
  	HSH_GRACE
  };
  
  /* mgt_hash.c */
  void HSH_config(const char *);
  
  /* cache_hash.c */
  void HSH_Init(const struct hash_slinger *);
  void HSH_Cleanup(struct worker *);
  
  extern const struct hash_slinger hsl_slinger;
  extern const struct hash_slinger hcl_slinger;
  extern const struct hash_slinger hcb_slinger;
  