insque(3)						     Library Functions Manual							 insque(3)

NAME

       insque, remque - Inserts or removes an element in a queue

LIBRARY

       Standard C Library (libc.a, libc.so)

SYNOPSIS

       #include <search.h>

       void insque(
	       void *element,
	       void *pred);

       void remque(
	       void *element);

STANDARDS

       Interfaces documented on this reference page conform to industry standards as follows:

       insque(), remque():  XPG4-UNIX

       Refer to the standards(5) reference page for more information about industry standards and associated tags.

PARAMETERS

       Points to the element in the queue immediately before the element to be inserted.  Points to the element to be inserted or deleted.

DESCRIPTION

       The insque() and remque() functions manipulate queues built from doubly-linked lists. The queue can be either circular or linear.

       An  application using these functions must define a structure in which the first two members are pointers to the same type of structure and
       any further members are application-specific.  The first member of the structure is a forward pointer to the next entry in the queue.   The
       second member is a backward pointer to the previous entry in the queue.	If the queue is linear, it is terminated with null pointers.

       The insque() function inserts the element pointed to by element into a queue immediately after the element pointed to by pred.

       The remque() function removed the element pointed to by element from a queue.

       When using the queue as a linear list, the forward and backward pointers of element can be initialized to null pointers by invoking

       insque (&element, NULL);

       where element is the initial element of the queue.

       When  using  the queue as a circular list, the application must initialize the forward pointer and the backward pointer of the initial ele-
       ment of the queue to the element's own address.

RETURN VALUES

       The insque() and remque() functions do not return a value.

RELATED INFORMATION

       Standards: standards(5) delim off

																	 insque(3)