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Ceil queue size to power of 2

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This commit is contained in:
Umar Farooq 2016-12-22 19:24:37 +01:00
parent 8e4eeef3f1
commit 66d184589b
2 changed files with 5 additions and 8 deletions
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6
include/villas/utils.h
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@ -62,12 +62,6 @@
/** Check if the number is a power of 2 */
#define IS_POW2(x) (((x) != 0) && !((x) & ((x) - 1)))
/** Get nearest up-rounded power of 2 */
#define LOG2_CEIL(x) (1 << (log2i((x) - 1) + 1))
/** Check if the number is a power of 2 */
#define IS_POW2(x) (((x) != 0) && !((x) & ((x) - 1)))
/** Calculate the number of elements in an array. */
#define ARRAY_LEN(a) ( sizeof (a) / sizeof (a)[0] )

7
lib/queue.c
View file

@ -39,8 +39,11 @@ int queue_init(struct queue *q, size_t size, const struct memtype *mem)
{
/* Queue size must be 2 exponent */
if (!IS_POW2(size))
return -1;
if (!IS_POW2(size)) {
size_t old_size = size;
size = LOG2_CEIL(size);
warn("A queue size was changed from %lu to %lu", old_size, size);
}
q->mem = mem;
q->buffer_mask = size - 1;