priority_queue.h File Reference

A simple priority queue. More...

Detailed Description

A simple priority queue.

Author

Kaspar Schleiser kaspa.nosp@m.r@sc.nosp@m.hleis.nosp@m.er.d.nosp@m.e

Definition in file priority_queue.h.

#include <stddef.h>
#include <stdint.h>

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Data Structures
struct	priority_queue_node
	data type for priority queue nodes More...
struct	priority_queue_t
	data type for priority queues More...
#define	PRIORITY_QUEUE_NODE_INIT   { NULL, 0, 0 }
	Static initializer for priority_queue_node_t.
#define	PRIORITY_QUEUE_DATA_SIGNALING   (UINTPTR_MAX)
	Constant for signaling in the priority queue data member.
#define	PRIORITY_QUEUE_INIT   { NULL }
	Static initializer for priority_queue_t.
typedef struct priority_queue_node	priority_queue_node_t
	data type for priority queue nodes
static void	priority_queue_node_init (priority_queue_node_t *priority_queue_node)
	Initialize a priority queue node object.
static void	priority_queue_init (priority_queue_t *priority_queue)
	Initialize a priority queue object.
priority_queue_node_t *	priority_queue_remove_head (priority_queue_t *root)
	remove the priority queue's head
void	priority_queue_add (priority_queue_t *root, priority_queue_node_t *new_obj)
	insert new_obj into root based on its priority
void	priority_queue_remove (priority_queue_t *root, priority_queue_node_t *node)
	remove node from root
void	priority_queue_print (priority_queue_t *root)
	print the data and priority of every node in the given priority queue
void	priority_queue_print_node (priority_queue_t *root)
	print the data, priority, and successor of a given node

Macro Definition Documentation

PRIORITY_QUEUE_DATA_SIGNALING

#define PRIORITY_QUEUE_DATA_SIGNALING   (UINTPTR_MAX)

Constant for signaling in the priority queue data member.

Definition at line 53 of file priority_queue.h.

PRIORITY_QUEUE_INIT

#define PRIORITY_QUEUE_INIT   { NULL }

Static initializer for priority_queue_t.

Definition at line 74 of file priority_queue.h.

PRIORITY_QUEUE_NODE_INIT

#define PRIORITY_QUEUE_NODE_INIT   { NULL, 0, 0 }

Static initializer for priority_queue_node_t.

Definition at line 48 of file priority_queue.h.

Function Documentation

priority_queue_add()

void priority_queue_add	(	priority_queue_t *	root,
		priority_queue_node_t *	new_obj
	)

insert new_obj into root based on its priority

The new object will be appended after objects with the same priority.

Parameters

[in,out]	root	the queue's root
[in]	new_obj	the object to prepend

Precondition

The queue does not already contain new_obj.

priority_queue_init()

static void priority_queue_init ( priority_queue_t *  priority_queue )

inlinestatic

Initialize a priority queue object.

For initialization of variables use PRIORITY_QUEUE_INIT instead. Only use this function for dynamically allocated priority queues.

Parameters

[out]

priority_queue

pre-allocated priority_queue_t object, must not be NULL.

Definition at line 84 of file priority_queue.h.

priority_queue_node_init()

static void priority_queue_node_init ( priority_queue_node_t *  priority_queue_node )

inlinestatic

Initialize a priority queue node object.

For initialization of variables use PRIORITY_QUEUE_NODE_INIT instead. Only use this function for dynamically allocated priority queue nodes.

Parameters

[out]

priority_queue_node

pre-allocated priority_queue_node_t object, must not be NULL.

Definition at line 63 of file priority_queue.h.

priority_queue_print()

void priority_queue_print

(

priority_queue_t *

root

)

print the data and priority of every node in the given priority queue

Note

requires ENABLE_DEBUG to be set to 1 for this file

priority_queue_print_node()

void priority_queue_print_node

(

priority_queue_t *

root

)

print the data, priority, and successor of a given node

Note

requires ENABLE_DEBUG to be set to 1 for this file

priority_queue_remove()

void priority_queue_remove	(	priority_queue_t *	root,
		priority_queue_node_t *	node
	)

remove node from root

Parameters

[in,out]	root	the priority queue's root
[in]	node	the node to remove

priority_queue_remove_head()

priority_queue_node_t * priority_queue_remove_head

(

priority_queue_t *

root

)

remove the priority queue's head

Parameters

[out]

root

the queue's root

Returns

the old head