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Merge pull request #5951 from huffman/cc-rng-fix

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Fix infinite recursion error with CC rng
This commit is contained in:
Brad Hefta-Gaub 2015-09-30 12:36:35 -07:00
commit 46e1a298c8
1 changed files with 10 additions and 7 deletions
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17
libraries/networking/src/udt/CongestionControl.cpp
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@ -161,13 +161,16 @@ void DefaultCC::onLoss(SequenceNumber rangeStart, SequenceNumber rangeEnd) {
_lastDecreaseMaxSeq = _sendCurrSeqNum;
// avoid synchronous rate decrease across connections using randomization
std::random_device rd;
std::mt19937 generator(rd());
std::uniform_int_distribution<> distribution(1, _avgNAKNum);
_randomDecreaseThreshold = distribution(generator);
if (_avgNAKNum < 1) {
_randomDecreaseThreshold = 1;
} else {
// avoid synchronous rate decrease across connections using randomization
std::random_device rd;
std::mt19937 generator(rd());
std::uniform_int_distribution<> distribution(1, std::max(1, _avgNAKNum));
_randomDecreaseThreshold = distribution(generator);
}
} else if ((_decreaseCount++ < MAX_DECREASES_PER_CONGESTION_EPOCH) && ((++_nakCount % _randomDecreaseThreshold) == 0)) {
// there have been fewer than MAX_DECREASES_PER_CONGESTION_EPOCH AND this NAK matches the random count at which we
// decided we would decrease the packet send period