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/*
* BRLTTY - A background process providing access to the console screen (when in
* text mode) for a blind person using a refreshable braille display.
*
* Copyright (C) 1995-2010 by The BRLTTY Developers.
*
* BRLTTY comes with ABSOLUTELY NO WARRANTY.
*
* This is free software, placed under the terms of the
* GNU General Public License, as published by the Free Software
* Foundation; either version 2 of the License, or (at your option) any
* later version. Please see the file LICENSE-GPL for details.
*
* Web Page: http://mielke.cc/brltty/
*
* This software is maintained by Dave Mielke <dave@mielke.cc>.
*/
#ifndef BRLTTY_INCLUDED_QUEUE
#define BRLTTY_INCLUDED_QUEUE
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
typedef struct QueueStruct Queue;
typedef struct ElementStruct Element;
typedef void (*ItemDeallocator) (void *item, void *data);
typedef int (*ItemComparator) (const void *item1, const void *item2, void *data);
extern Queue *newQueue (ItemDeallocator deallocate, ItemComparator compare);
extern void deallocateQueue (Queue *queue);
extern Element *getQueueHead (const Queue *queue);
extern int getQueueSize (const Queue *queue);
extern void *getQueueData (const Queue *queue);
extern void *setQueueData (Queue *queue, void *data);
extern Element *enqueueItem (Queue *queue, void *item);
extern void *dequeueItem (Queue *queue);
extern int deleteItem (Queue *queue, const void *item);
extern Queue *getElementQueue (const Element *element);
extern void *getElementItem (const Element *element);
extern void deleteElements (Queue *queue);
extern void deleteElement (Element *element);
extern void requeueElement (Element *element);
typedef int (*ItemTester) (const void *item, const void *data);
extern Element *findElement (const Queue *queue, ItemTester testItem, const void *data);
extern void *findItem (const Queue *queue, ItemTester testItem, const void *data);
typedef int (*ItemProcessor) (void *item, void *data);
extern Element *processQueue (Queue *queue, ItemProcessor processItem, void *data);
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* BRLTTY_INCLUDED_QUEUE */
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