UDI_QUEUE_INIT, UDI_QUEUE_EMPTY

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Initialize queue; check if it's empty

SYNOPSIS

#include <udi.h>

#define UDI_QUEUE_INIT(listhead) \

	((listhead)->next = (listhead)->prev =(listhead))
 
#define UDI_QUEUE_EMPTY(listhead) \

	((listhead)->next == (listhead))
 

ARGUMENTS listhead is a pointer to a list head element.

DESCRIPTION UDI_QUEUE_INIT initializes the queue's list head and must be called before any other operations are performed on the queue.

UDI_QUEUE_EMPTY is used to determine if the queue specified by listhead is empty, based on the boolean return value (non-zero if empty; zero if non-empty).

These macros must be called as if they, respectively, had the following functional interfaces:

void UDI_QUEUE_INIT (

		udi_queue_t *listhead );
 
udi_boolean_t UDI_QUEUE_EMPTY (

		udi_queue_t *listhead );
 

REFERENCES udi_queue_t