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| author | Denys Vlasenko | 2014-02-09 15:35:04 +0100 |
|---|---|---|
| committer | Denys Vlasenko | 2014-02-09 15:35:04 +0100 |
| commit | 3e78f6f955ebdc010bb0b8f78622bf701e594b69 (patch) | |
| tree | 6ea197099918a1894fe5119208a5e0b779ac8ce1 /networking | |
| parent | 8ed96726603a59969b99e4ea30dbd9b06955084b (diff) | |
| download | busybox-3e78f6f955ebdc010bb0b8f78622bf701e594b69.zip busybox-3e78f6f955ebdc010bb0b8f78622bf701e594b69.tar.gz | |
htpd: trivial simplification in random interval selection
function old new delta
poll_interval 57 52 -5
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'networking')
| -rw-r--r-- | networking/ntpd.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/networking/ntpd.c b/networking/ntpd.c index 03fe448..bf8ef0a 100644 --- a/networking/ntpd.c +++ b/networking/ntpd.c @@ -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; } |