bucket->bucket = MIN(bucket->bucket, cfg->burst);
}
+/**
+ * Given an amount of <b>elapsed</b> time units, and a bucket configuration
+ * <b>cfg</b>, refill the level of <b>bucket</b> accordingly. Note that the
+ * units of time in <b>elapsed</b> must correspond to those used to set the
+ * rate in <b>cfg</b>, or the result will be illogical.
+ */
+int
+token_bucket_raw_refill_steps(token_bucket_raw_t *bucket,
+ const token_bucket_cfg_t *cfg,
+ const uint32_t elapsed)
+{
+ const int was_empty = (bucket->bucket <= 0);
+ /* The casts here prevent an underflow.
+ *
+ * Note that even if the bucket value is negative, subtracting it from
+ * "burst" will still produce a correct result. If this result is
+ * ridiculously high, then the "elapsed > gap / rate" check below
+ * should catch it. */
+ const size_t gap = ((size_t)cfg->burst) - ((size_t)bucket->bucket);
+
+ if (elapsed > gap / cfg->rate) {
+ bucket->bucket = cfg->burst;
+ } else {
+ bucket->bucket += cfg->rate * elapsed;
+ }
+
+ return was_empty && bucket->bucket > 0;
+}
+
+/**
+ * Decrement a provided bucket by <b>n</b> units. Note that <b>n</b>
+ * must be nonnegative.
+ */
+int
+token_bucket_raw_dec(token_bucket_raw_t *bucket,
+ ssize_t n)
+{
+ if (BUG(n < 0))
+ return 0;
+ const int becomes_empty = bucket->bucket > 0 && n >= bucket->bucket;
+ bucket->bucket -= n;
+ return becomes_empty;
+}
+
/** Convert a rate in bytes per second to a rate in bytes per step */
static uint32_t
rate_per_sec_to_rate_per_step(uint32_t rate)
&bucket->cfg, now_ts);
}
-/**
- * Given an amount of <b>elapsed</b> time units, and a bucket configuration
- * <b>cfg</b>, refill the level of <b>bucket</b> accordingly. Note that the
- * units of time in <b>elapsed</b> must correspond to those used to set the
- * rate in <b>cfg</b>, or the result will be illogical.
- */
-int
-token_bucket_raw_refill_steps(token_bucket_raw_t *bucket,
- const token_bucket_cfg_t *cfg,
- const uint32_t elapsed)
-{
- const int was_empty = (bucket->bucket <= 0);
- /* The casts here prevent an underflow.
- *
- * Note that even if the bucket value is negative, subtracting it from
- * "burst" will still produce a correct result. If this result is
- * ridiculously high, then the "elapsed > gap / rate" check below
- * should catch it. */
- const size_t gap = ((size_t)cfg->burst) - ((size_t)bucket->bucket);
-
- if (elapsed > gap / cfg->rate) {
- bucket->bucket = cfg->burst;
- } else {
- bucket->bucket += cfg->rate * elapsed;
- }
-
- return was_empty && bucket->bucket > 0;
-}
-
/**
* Refill <b>bucket</b> as appropriate, given that the current timestamp
* is <b>now_ts</b>.
return flags;
}
-/**
- * Decrement a provided bucket by <b>n</b> units. Note that <b>n</b>
- * must be nonnegative.
- */
-int
-token_bucket_raw_dec(token_bucket_raw_t *bucket,
- ssize_t n)
-{
- if (BUG(n < 0))
- return 0;
- const int becomes_empty = bucket->bucket > 0 && n >= bucket->bucket;
- bucket->bucket -= n;
- return becomes_empty;
-}
-
/**
* Decrement the read token bucket in <b>bucket</b> by <b>n</b> bytes.
*