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| author | Kuan-Wei Chiu <visitorckw@gmail.com> | 2024-03-05 21:36:23 +0800 |
|---|---|---|
| committer | Kuan-Wei Chiu <visitorckw@gmail.com> | 2024-04-25 21:31:03 +0800 |
| commit | 32bc3cee9da58b9e9d498d7d0896fd7715b7b862 (patch) | |
| tree | 9f8ffe961084d4a3c53f9e845f077e87b509a7bf | |
| parent | 4b004992fb1469652017cb336a2cba284c7e6ba4 (diff) | |
lib min_heap: Add min_heap_peek()
Add min_heap_peek() function to retrieve a pointer to the smallest
element. The pointer is cast to the appropriate type of heap elements.
Signed-off-by: Kuan-Wei Chiu <visitorckw@gmail.com>
Reviewed-by: Ian Rogers <irogers@google.com>
| -rw-r--r-- | include/linux/min_heap.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/include/linux/min_heap.h b/include/linux/min_heap.h index f6b07fb8b2d3..043de539bf71 100644 --- a/include/linux/min_heap.h +++ b/include/linux/min_heap.h @@ -53,6 +53,16 @@ void __min_heap_init(min_heap_char *heap, void *data, int size) #define min_heap_init(_heap, _data, _size) \ __min_heap_init((min_heap_char *)_heap, _data, _size) +/* Get the minimum element from the heap. */ +static __always_inline +void *__min_heap_peek(struct min_heap_char *heap) +{ + return heap->nr ? heap->data : NULL; +} + +#define min_heap_peek(_heap) \ + (__minheap_cast(_heap) __min_heap_peek((min_heap_char *)_heap)) + /* Sift the element at pos down the heap. */ static __always_inline void __min_heapify(min_heap_char *heap, int pos, size_t elem_size, |