Team Fortress 2 Source Code as on 22/4/2020
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//========= Copyright Valve Corporation, All rights reserved. ============//
//
// Purpose:
//
//=============================================================================
#include "net_ws_headers.h"
#include "net_ws_queued_packet_sender.h"
#include "tier1/utlvector.h"
#include "tier1/utlpriorityqueue.h"
#include "tier0/etwprof.h"
// memdbgon must be the last include file in a .cpp file!!!
#include "tier0/memdbgon.h"
ConVar net_queued_packet_thread( "net_queued_packet_thread", "1", 0, "Use a high priority thread to send queued packets out instead of sending them each frame." );
ConVar net_queue_trace( "net_queue_trace", "0", 0 );
class CQueuedPacketSender : public CThread, public IQueuedPacketSender
{
public:
CQueuedPacketSender();
~CQueuedPacketSender();
// IQueuedPacketSender
virtual bool Setup();
virtual void Shutdown();
virtual bool IsRunning() { return CThread::IsAlive(); }
virtual void ClearQueuedPacketsForChannel( INetChannel *pChan );
virtual void QueuePacket( INetChannel *pChan, SOCKET s, const char FAR *buf, int len, const struct sockaddr FAR * to, int tolen, uint32 msecDelay );
virtual bool HasQueuedPackets( const INetChannel *pChan ) const;
private:
// CThread Overrides
virtual bool Start( unsigned int nBytesStack = 0 );
virtual int Run();
private:
class CQueuedPacket
{
public:
uint32 m_unSendTime;
const void *m_pChannel; // We don't actually use the channel
SOCKET m_Socket;
CUtlVector<char> to; // sockaddr
CUtlVector<char> buf;
// We want the list sorted in ascending order, so note that we return > rather than <
static bool LessFunc( CQueuedPacket * const &lhs, CQueuedPacket * const &rhs )
{
return lhs->m_unSendTime > rhs->m_unSendTime;
}
};
CUtlPriorityQueue< CQueuedPacket * > m_QueuedPackets;
CThreadMutex m_QueuedPacketsCS;
CThreadEvent m_hThreadEvent;
volatile bool m_bThreadShouldExit;
};
static CQueuedPacketSender g_QueuedPacketSender;
IQueuedPacketSender *g_pQueuedPackedSender = &g_QueuedPacketSender;
CQueuedPacketSender::CQueuedPacketSender() :
m_QueuedPackets( 0, 0, CQueuedPacket::LessFunc )
{
SetName( "QueuedPacketSender" );
m_bThreadShouldExit = false;
}
CQueuedPacketSender::~CQueuedPacketSender()
{
Shutdown();
}
bool CQueuedPacketSender::Setup()
{
return Start();
}
bool CQueuedPacketSender::Start( unsigned nBytesStack )
{
Shutdown();
if ( CThread::Start( nBytesStack ) )
{
// Ahhh the perfect cross-platformness of the threads library.
#ifdef IS_WINDOWS_PC
SetPriority( THREAD_PRIORITY_HIGHEST );
#elif POSIX
//SetPriority( PRIORITY_MAX );
#endif
m_bThreadShouldExit = false;
return true;
}
else
{
return false;
}
}
void CQueuedPacketSender::Shutdown()
{
if ( !IsAlive() )
return;
m_bThreadShouldExit = true;
m_hThreadEvent.Set();
Join(); // Wait for the thread to exit.
while ( m_QueuedPackets.Count() > 0 )
{
delete m_QueuedPackets.ElementAtHead();
m_QueuedPackets.RemoveAtHead();
}
m_QueuedPackets.Purge();
}
void CQueuedPacketSender::ClearQueuedPacketsForChannel( INetChannel *pChan )
{
AUTO_LOCK( m_QueuedPacketsCS );
for ( int i = m_QueuedPackets.Count()-1; i >= 0; i-- )
{
CQueuedPacket *p = m_QueuedPackets.Element( i );
if ( p->m_pChannel == pChan )
{
m_QueuedPackets.RemoveAt( i );
delete p;
}
}
}
bool CQueuedPacketSender::HasQueuedPackets( const INetChannel *pChan ) const
{
AUTO_LOCK( m_QueuedPacketsCS );
for ( int i = 0; i < m_QueuedPackets.Count(); ++i )
{
const CQueuedPacket *p = m_QueuedPackets.Element( i );
if ( p->m_pChannel == pChan )
{
return true;
}
}
return false;
}
void CQueuedPacketSender::QueuePacket( INetChannel *pChan, SOCKET s, const char FAR *buf, int len, const struct sockaddr FAR * to, int tolen, uint32 msecDelay )
{
AUTO_LOCK( m_QueuedPacketsCS );
// We'll pull all packets we should have sent by now and send them out right away
uint32 msNow = Plat_MSTime();
int nMaxQueuedPackets = 1024;
if ( m_QueuedPackets.Count() < nMaxQueuedPackets )
{
// Add this packet to the queue.
CQueuedPacket *pPacket = new CQueuedPacket;
pPacket->m_unSendTime = msNow + msecDelay;
pPacket->m_Socket = s;
pPacket->m_pChannel = pChan;
pPacket->buf.CopyArray( (char*)buf, len );
pPacket->to.CopyArray( (char*)to, tolen );
m_QueuedPackets.Insert( pPacket );
}
else
{
static int nWarnings = 5;
if ( --nWarnings > 0 )
{
Warning( "CQueuedPacketSender: num queued packets >= nMaxQueuedPackets. Not queueing anymore.\n" );
}
}
// Tell the thread that we have a queued packet.
m_hThreadEvent.Set();
}
extern int NET_SendToImpl( SOCKET s, const char FAR * buf, int len, const struct sockaddr FAR * to, int tolen, int iGameDataLength );
int CQueuedPacketSender::Run()
{
// Normally TT_INFINITE but we wakeup every 50ms just in case.
uint32 waitIntervalNoPackets = 50;
uint32 waitInterval = waitIntervalNoPackets;
while ( 1 )
{
if ( m_hThreadEvent.Wait( waitInterval ) )
{
// Someone signaled the thread. Either we're being told to exit or
// we're being told that a packet was just queued.
if ( m_bThreadShouldExit )
return 0;
}
// Assume nothing to do and that we'll sleep again
waitInterval = waitIntervalNoPackets;
// OK, now send a packet.
{
AUTO_LOCK( m_QueuedPacketsCS );
// We'll pull all packets we should have sent by now and send them out right away
uint32 msNow = Plat_MSTime();
bool bTrace = net_queue_trace.GetInt() == NET_QUEUED_PACKET_THREAD_DEBUG_VALUE;
while ( m_QueuedPackets.Count() > 0 )
{
CQueuedPacket *pPacket = m_QueuedPackets.ElementAtHead();
if ( pPacket->m_unSendTime > msNow )
{
// Sleep until next we need this packet
waitInterval = pPacket->m_unSendTime - msNow;
// Emit ETW events to help with diagnosing network throttling issues as
// these often have a severe effect on load times in Dota.
ETWMark1I( "CQueuedPacketSender::Run sleeping (ms)", waitInterval );
if ( bTrace )
{
Warning( "SQ: sleeping for %u msecs at %f\n", waitInterval, Plat_FloatTime() );
}
break;
}
// If it's a bot, don't do anything. Note: we DO want this code deep here because bots only
// try to send packets when sv_stressbots is set, in which case we want it to act as closely
// as a real player as possible.
sockaddr_in *pInternetAddr = (sockaddr_in*)pPacket->to.Base();
#ifdef _WIN32
if ( pInternetAddr->sin_addr.S_un.S_addr != 0
#else
if ( pInternetAddr->sin_addr.s_addr != 0
#endif
&& pInternetAddr->sin_port != 0 )
{
if ( bTrace )
{
Warning( "SQ: sending %d bytes at %f\n", pPacket->buf.Count(), Plat_FloatTime() );
}
NET_SendToImpl
(
pPacket->m_Socket,
pPacket->buf.Base(),
pPacket->buf.Count(),
(sockaddr*)pPacket->to.Base(),
pPacket->to.Count(),
-1
);
}
delete pPacket;
m_QueuedPackets.RemoveAtHead();
}
}
}
}