3e78f6f95
Denys Vlasenko
2014-02-09
Subject
htpd: trivial simplification in random interval selection
Binary
No binary (build failed)
Architecture & Compiler Flags
—
Build Log
(log yok)
Commit Diff GitHub →
networking/ntpd.c+3 -2
| @@ -1660,13 +1660,14 @@ retry_interval(void) | |
| static unsigned | |
| poll_interval(int exponent) | |
| { | |
| - | unsigned interval, r; |
| + | unsigned interval, r, mask; |
| exponent = G.poll_exp + exponent; | |
| if (exponent < 0) | |
| exponent = 0; | |
| interval = 1 << exponent; | |
| + | mask = ((interval-1) >> 4) | 1; |
| r = random(); | |
| - | interval += ((r & (interval-1)) >> 4) + ((r >> 8) & 1); /* + 1/16 of interval, max */ |
| + | interval += r & mask; /* ~ random(0..1) * interval/16 */ |
| VERB4 bb_error_msg("chose poll interval:%u (poll_exp:%d exp:%d)", interval, G.poll_exp, exponent); | |
| return interval; | |
| } | |