IABSD.fr/src/lib/libc/stdlib/insque.3

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• Author : schwarze
  Date : 2020-04-26 16:36:14
  Hash : 88446cb7
  Message : Minimal maintenance to make this mess slightly less confusing: queue -> list; mention "intrusive"; element -> member at one place; delete a bogus remark that maybe referred to a long-gone implementation in VAX assembly code. Much more could be improved, but i don't want to waste too much time here.

• lib/libc/stdlib/insque.3

• .\"	$OpenBSD: insque.3,v 1.12 2020/04/26 16:36:14 schwarze Exp $
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  .Dd $Mdocdate: April 26 2020 $
  .Dt INSQUE 3
  .Os
  .Sh NAME
  .Nm insque ,
  .Nm remque
  .Nd legacy doubly linked lists
  .Sh SYNOPSIS
  .In search.h
  .Ft void
  .Fn insque "void *elem" "void *pred"
  .Ft void
  .Fn remque "void *elem"
  .Sh DESCRIPTION
  .Bf -symbolic
  These interfaces have been superseded by the
  .Xr queue 3
  macros and are provided for compatibility with legacy code.
  .Ef
  .Pp
  .Fn insque
  and
  .Fn remque
  manipulate a legacy variety of intrusive doubly linked lists.
  A list can be either circular or linear.
  Each element in the list must be of the following form:
  .Bd -literal -offset indent
  struct qelem {
  	struct qelem   *q_forw;
  	struct qelem   *q_back;
  	char            q_data[];
  };
  .Ed
  .Pp
  The first two members of the struct must be pointers of the
  same type that point to the next and previous elements in
  the list, respectively.
  Any subsequent data in the struct is application-dependent.
  .Pp
  The
  .Fn insque
  function inserts
  .Fa elem
  into a list immediately after
  .Fa pred .
  .Pp
  The
  .Fn remque
  function removes
  .Fa elem
  from the list.
  .Pp
  These functions are not atomic.
  .Sh SEE ALSO
  .Xr queue 3
  .Sh STANDARDS
  The
  .Fn insque
  and
  .Fn remque
  functions conform to the X/Open System Interfaces option of the
  .St -p1003.1-2008
  specification.
  .Sh HISTORY
  The
  .Fn insque
  and
  .Fn remque
  functions are derived from the
  .Li insque
  and
  .Li remque
  instructions on the VAX.
  They first appeared in
  .Bx 4.2 .