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added a comment on top of the zslRandomLevel() function

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antirez 2012-01-16 09:39:04 +01:00
parent 06312eed86
commit 7faa1f075b
1 changed files with 4 additions and 0 deletions
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4
src/t_zset.c
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@ -64,6 +64,10 @@ void zslFree(zskiplist *zsl) {
zfree(zsl); zfree(zsl);
} }
/* Returns a random level for the new skiplist node we are going to create.
* The return value of this function is between 1 and ZSKIPLIST_MAXLEVEL
* (both inclusive), with a powerlaw-alike distribution where higher
* levels are less likely to be returned. */
int zslRandomLevel(void) { int zslRandomLevel(void) {
int level = 1; int level = 1;
while ((random()&0xFFFF) < (ZSKIPLIST_P * 0xFFFF)) while ((random()&0xFFFF) < (ZSKIPLIST_P * 0xFFFF))