mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-29 07:34:06 +08:00
59 lines
1.8 KiB
C
59 lines
1.8 KiB
C
|
#ifndef _LINUX_PRIO_HEAP_H
|
||
|
|
#define _LINUX_PRIO_HEAP_H
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Simple insertion-only static-sized priority heap containing
|
||
|
|
* pointers, based on CLR, chapter 7
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/gfp.h>
|
||
|
|
|
||
|
|
/**
|
||
|
|
* struct ptr_heap - simple static-sized priority heap
|
||
|
|
* @ptrs - pointer to data area
|
||
|
|
* @max - max number of elements that can be stored in @ptrs
|
||
|
|
* @size - current number of valid elements in @ptrs (in the range 0..@size-1
|
||
|
|
* @gt: comparison operator, which should implement "greater than"
|
||
|
|
*/
|
||
|
|
struct ptr_heap {
|
||
|
|
void **ptrs;
|
||
|
|
int max;
|
||
|
|
int size;
|
||
|
|
int (*gt)(void *, void *);
|
||
|
|
};
|
||
|
|
|
||
|
|
/**
|
||
|
|
* heap_init - initialize an empty heap with a given memory size
|
||
|
|
* @heap: the heap structure to be initialized
|
||
|
|
* @size: amount of memory to use in bytes
|
||
|
|
* @gfp_mask: mask to pass to kmalloc()
|
||
|
|
* @gt: comparison operator, which should implement "greater than"
|
||
|
|
*/
|
||
|
|
extern int heap_init(struct ptr_heap *heap, size_t size, gfp_t gfp_mask,
|
||
|
|
int (*gt)(void *, void *));
|
||
|
|
|
||
|
|
/**
|
||
|
|
* heap_free - release a heap's storage
|
||
|
|
* @heap: the heap structure whose data should be released
|
||
|
|
*/
|
||
|
|
void heap_free(struct ptr_heap *heap);
|
||
|
|
|
||
|
|
/**
|
||
|
|
* heap_insert - insert a value into the heap and return any overflowed value
|
||
|
|
* @heap: the heap to be operated on
|
||
|
|
* @p: the pointer to be inserted
|
||
|
|
*
|
||
|
|
* Attempts to insert the given value into the priority heap. If the
|
||
|
|
* heap is full prior to the insertion, then the resulting heap will
|
||
|
|
* consist of the smallest @max elements of the original heap and the
|
||
|
|
* new element; the greatest element will be removed from the heap and
|
||
|
|
* returned. Note that the returned element will be the new element
|
||
|
|
* (i.e. no change to the heap) if the new element is greater than all
|
||
|
|
* elements currently in the heap.
|
||
|
|
*/
|
||
|
|
extern void *heap_insert(struct ptr_heap *heap, void *p);
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
#endif /* _LINUX_PRIO_HEAP_H */
|