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sched: update timeout randomization

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Use UTI_GetRandomBytes() instead of random() to calculate the random
part of the timeout. This was the only remaining use of random() in the
code and the srandom() call can be removed.
This commit is contained in:
Miroslav Lichvar 2015-11-13 16:08:02 +01:00
parent 8225bf01f7
commit dfc96e4702
1 changed files with 4 additions and 3 deletions
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7
sched.c
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@ -150,8 +150,6 @@ SCH_Initialise(void)
LCL_ReadRawTime(&last_select_ts_raw);
last_select_ts = last_select_ts_raw;
srandom(last_select_ts.tv_sec << 16 ^ last_select_ts.tv_usec);
initialised = 1;
}
@ -376,7 +374,10 @@ SCH_AddTimeoutInClass(double min_delay, double separation, double randomness,
assert(class < SCH_NumberOfClasses);
if (randomness > 0.0) {
r = random() % 0xffff / (0xffff - 1.0) * randomness + 1.0;
uint16_t rnd;
UTI_GetRandomBytes(&rnd, sizeof (rnd));
r = rnd / (double)0xffff * randomness + 1.0;
min_delay *= r;
separation *= r;
}