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grab the now timestamp only when needed

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This commit is contained in:
Stephen Birarda 2016-03-16 08:53:31 -07:00
parent 1cd16da83e
commit c94e2bdc8b
1 changed files with 2 additions and 4 deletions
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6
libraries/networking/src/udt/SendQueue.cpp
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@ -29,6 +29,7 @@
#include "Socket.h"
using namespace udt;
using namespace std::chrono;
template <typename Mutex1, typename Mutex2>
class DoubleLock {
@ -303,15 +304,12 @@ void SendQueue::run() {
if (_state != State::Running || isInactive(sentAPacket)) {
return;
}
// grab the current HRC timestamp
const auto now = p_high_resolution_clock::now();
// push the next packet timestamp forwards by the current packet send period
nextPacketTimestamp += std::chrono::microseconds(_packetSendPeriod);
// sleep as long as we need until next packet send, if we can
const auto timeToSleep = std::chrono::duration_cast<std::chrono::microseconds>(nextPacketTimestamp - now);
const auto timeToSleep = duration_cast<microseconds>(nextPacketTimestamp - p_high_resolution_clock::now());
std::this_thread::sleep_for(timeToSleep);
}