insque, remque - insert/remove an item from a queue
SYNOPSIS
#include <stdlib.h>
void insque(struct qelem *elem, struct qelem *prev);
void remque(struct qelem *elem);
DESCRIPTION
insque() and remque() are functions for manipulating
queues made from doubly-linked lists. Each element in
this list is of type struct qelem
The qelem structure is defined as
struct qelem {
struct qelem *q_forw;
struct qelem *q_back;
char q_data[1];
};
insque() inserts the element pointed to by elem immedi
ately after the element pointed to by prev, which must NOT
be NULL.
remque() removes the element pointed to by elem from the
doubly-linked list.
CONFORMING TO
SVR4
BUGS
The q_data field is sometimes defined to be type char *,
and under solaris 2.x, it doesn't appear to exist at all.
The location of the prototypes for these functions differ
among several versions of UNIX. Some systems place them
in <search.h>, others in <string.h>. Linux places them in
<stdlib.h> since that seems to make the most sense.
Some versions of UNIX (like HP-UX 10.x) do not define a
struct qelem but rather have the arguments to insque() and
remque() be of type void *.
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