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khanat-opennel-code/code/nel/src/net/buf_server.cpp

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// NeL - MMORPG Framework <http://dev.ryzom.com/projects/nel/>
// Copyright (C) 2010 Winch Gate Property Limited
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
#include "stdnet.h"
#include "nel/misc/hierarchical_timer.h"
#include "nel/net/buf_server.h"
#include "nel/net/net_log.h"
#ifdef NL_OS_WINDOWS
# define NOMINMAX
# include <windows.h>
#elif defined NL_OS_UNIX
# include <unistd.h>
# include <cerrno>
# include <sys/types.h>
# include <sys/time.h>
#endif
/*
* On Linux, the default limit of descriptors is usually 1024, you can increase it with ulimit
*/
using namespace NLMISC;
using namespace std;
namespace NLNET {
uint32 NbServerListenTask = 0;
uint32 NbServerReceiveTask = 0;
/***************************************************************************************************
* User main thread (initialization)
**************************************************************************************************/
/*
* Constructor
*/
CBufServer::CBufServer( TThreadStategy strategy,
uint16 max_threads, uint16 max_sockets_per_thread, bool nodelay, bool replaymode, bool initPipeForDataAvailable ) :
#ifdef NL_OS_UNIX
CBufNetBase( initPipeForDataAvailable ),
#else
CBufNetBase(),
#endif
_ThreadStrategy( strategy ),
_MaxThreads( max_threads ),
_MaxSocketsPerThread( max_sockets_per_thread ),
_ListenTask( NULL ),
_ListenThread( NULL ),
_ThreadPool("CBufServer::_ThreadPool"),
_ConnectionCallback( NULL ),
_ConnectionCbArg( NULL ),
_BytesPushedOut( 0 ),
_BytesPoppedIn( 0 ),
_PrevBytesPoppedIn( 0 ),
_PrevBytesPushedOut( 0 ),
_NbConnections (0),
_NoDelay( nodelay ),
_ReplayMode( replaymode )
{
nlnettrace( "CBufServer::CBufServer" );
if ( ! _ReplayMode )
{
_ListenTask = new CListenTask( this );
_ListenThread = IThread::create( _ListenTask, 1024*4*4 );
}
/*{
CSynchronized<uint32>::CAccessor syncbpi ( &_BytesPushedIn );
syncbpi.value() = 0;
}*/
}
/*
* Listens on the specified port
*/
void CBufServer::init( uint16 port )
{
nlnettrace( "CBufServer::init" );
if ( ! _ReplayMode )
{
_ListenTask->init( port, maxExpectedBlockSize() );
_ListenThread->start();
}
else
{
LNETL1_DEBUG( "LNETL1: Binding listen socket to any address, port %hu", port );
}
}
/*
* Begins to listen on the specified port (call before running thread)
*/
void CListenTask::init( uint16 port, sint32 maxExpectedBlockSize )
{
nlnettrace( "CListenTask::init" );
_ListenSock.init( port );
_MaxExpectedBlockSize = maxExpectedBlockSize;
}
/***************************************************************************************************
* User main thread (running)
**************************************************************************************************/
/*
* Constructor
*/
CServerTask::CServerTask() : NbLoop (0), _ExitRequired(false)
{
#ifdef NL_OS_UNIX
if (pipe( _WakeUpPipeHandle ) == -1)
{
nlwarning("LNETL1: pipe() failed: code=%d '%s'", errno, strerror(errno));
}
#endif
}
#ifdef NL_OS_UNIX
/*
* Wake the thread up, when blocked in select (Unix only)
*/
void CServerTask::wakeUp()
{
uint8 b;
if ( write( _WakeUpPipeHandle[PipeWrite], &b, 1 ) == -1 )
{
LNETL1_DEBUG( "LNETL1: In CServerTask::wakeUp(): write() failed" );
}
}
#endif
/*
* Destructor
*/
CServerTask::~CServerTask()
{
#ifdef NL_OS_UNIX
close( _WakeUpPipeHandle[PipeRead] );
close( _WakeUpPipeHandle[PipeWrite] );
#endif
}
/*
* Destructor
*/
CBufServer::~CBufServer()
{
nlnettrace( "CBufServer::~CBufServer" );
// Clean listen thread exit
if ( ! _ReplayMode )
{
((CListenTask*)(_ListenThread->getRunnable()))->requireExit();
((CListenTask*)(_ListenThread->getRunnable()))->close();
#ifdef NL_OS_UNIX
_ListenTask->wakeUp();
#endif
_ListenThread->wait();
delete _ListenThread;
delete _ListenTask;
// Clean receive thread exits
CThreadPool::iterator ipt;
{
LNETL1_DEBUG( "LNETL1: Waiting for end of threads..." );
CSynchronized<CThreadPool>::CAccessor poolsync( &_ThreadPool );
for ( ipt=poolsync.value().begin(); ipt!=poolsync.value().end(); ++ipt )
{
// Tell the threads to exit and wake them up
CServerReceiveTask *task = receiveTask(ipt);
nlnettrace( "Requiring exit" );
task->requireExit();
// Wake the threads up
#ifdef NL_OS_UNIX
task->wakeUp();
#else
CConnections::iterator ipb;
nlnettrace( "Disconnecting sockets (Win32)" );
{
CSynchronized<CConnections>::CAccessor connectionssync( &task->_Connections );
for ( ipb=connectionssync.value().begin(); ipb!=connectionssync.value().end(); ++ipb )
{
(*ipb)->Sock->disconnect();
}
}
#endif
}
nlnettrace( "Waiting" );
for ( ipt=poolsync.value().begin(); ipt!=poolsync.value().end(); ++ipt )
{
// Wait until the threads have exited
(*ipt)->wait();
}
LNETL1_DEBUG( "LNETL1: Deleting sockets, tasks and threads..." );
for ( ipt=poolsync.value().begin(); ipt!=poolsync.value().end(); ++ipt )
{
// Delete the socket objects
CServerReceiveTask *task = receiveTask(ipt);
CConnections::iterator ipb;
{
CSynchronized<CConnections>::CAccessor connectionssync( &task->_Connections );
for ( ipb=connectionssync.value().begin(); ipb!=connectionssync.value().end(); ++ipb )
{
delete (*ipb); // closes and deletes the socket
}
}
// Delete the task objects
delete task;
// Delete the thread objects
delete (*ipt);
}
}
}
nlnettrace( "Exiting CBufServer::~CBufServer" );
}
/*
* Disconnect the specified host
* Set hostid to NULL to disconnect all connections.
* If hostid is not null and the socket is not connected, the method does nothing.
* If quick is true, any pending data will not be sent before disconnecting.
*/
void CBufServer::disconnect( TSockId hostid, bool quick )
{
nlnettrace( "CBufServer::disconnect" );
if ( hostid != InvalidSockId )
{
if (_ConnectedClients.find(hostid) == _ConnectedClients.end())
{
// this host is not connected
return;
}
// Disconnect only if physically connected
if ( hostid->Sock->connected() )
{
if ( ! quick )
{
hostid->flush();
}
hostid->Sock->disconnect(); // the connection will be removed by the next call of update()
}
}
else
{
// Disconnect all
CThreadPool::iterator ipt;
{
CSynchronized<CThreadPool>::CAccessor poolsync( &_ThreadPool );
for ( ipt=poolsync.value().begin(); ipt!=poolsync.value().end(); ++ipt )
{
CServerReceiveTask *task = receiveTask(ipt);
CConnections::iterator ipb;
{
CSynchronized<CConnections>::CAccessor connectionssync( &task->_Connections );
for ( ipb=connectionssync.value().begin(); ipb!=connectionssync.value().end(); ++ipb )
{
if ( (*ipb)->Sock->connected() )
{
if ( ! quick )
{
(*ipb)->flush();
}
(*ipb)->Sock->disconnect();
}
}
}
}
}
}
}
/*
* Send a message to the specified host
*/
void CBufServer::send( const CMemStream& buffer, TSockId hostid )
{
nlnettrace( "CBufServer::send" );
nlassert( buffer.length() > 0 );
nlassertex( buffer.length() <= maxSentBlockSize(), ("length=%u max=%u", buffer.length(), maxSentBlockSize()) );
// slow down the layer H_AUTO (CBufServer_send);
if ( hostid != InvalidSockId )
{
if (_ConnectedClients.find(hostid) == _ConnectedClients.end())
{
// this host is not connected
return;
}
pushBufferToHost( buffer, hostid );
}
else
{
// Push into all send queues
CThreadPool::iterator ipt;
{
CSynchronized<CThreadPool>::CAccessor poolsync( &_ThreadPool );
for ( ipt=poolsync.value().begin(); ipt!=poolsync.value().end(); ++ipt )
{
CServerReceiveTask *task = receiveTask(ipt);
CConnections::iterator ipb;
{
CSynchronized<CConnections>::CAccessor connectionssync( &task->_Connections );
for ( ipb=connectionssync.value().begin(); ipb!=connectionssync.value().end(); ++ipb )
{
// Send only if the socket is logically connected
if ( (*ipb)->connectedState() )
{
pushBufferToHost( buffer, *ipb );
}
}
}
}
}
}
}
/*
* Checks if there are some data to receive
*/
bool CBufServer::dataAvailable()
{
// slow down the layer H_AUTO (CBufServer_dataAvailable);
{
/* If no data available, enter the 'while' loop and return false (1 volatile test)
* If there are user data available, enter the 'while' and return true immediately (1 volatile test + 1 short locking)
* If there is a connection/disconnection event (rare), call the callback and loop
*/
while ( dataAvailableFlag() )
{
// Because _DataAvailable is true, the receive queue is not empty at this point
vector<uint8> buffer;
uint8 val;
{
CFifoAccessor recvfifo( &receiveQueue() );
val = recvfifo.value().frontLast();
if ( val != CBufNetBase::User )
{
recvfifo.value().front( buffer );
}
}
/*sint32 mbsize = recvfifo.value().size() / 1048576;
if ( mbsize > 0 )
{
nlwarning( "The receive queue size exceeds %d MB", mbsize );
}*/
/*vector<uint8> buffer;
recvfifo.value().front( buffer );*/
#ifdef NL_OS_UNIX
uint8 b;
if ( read( _DataAvailablePipeHandle[PipeRead], &b, 1 ) == -1 )
nlwarning( "LNETL1: Read pipe failed in dataAvailable" );
//nldebug( "Pipe: 1 byte read (server %p)", this );
#endif
// Test if it the next block is a system event
//switch ( buffer[buffer.size()-1] )
switch ( val )
{
// Normal message available
case CBufNetBase::User:
{
return true; // return immediately, do not extract the message
}
// Process disconnection event
case CBufNetBase::Disconnection:
{
TSockId sockid = *((TSockId*)(&*buffer.begin()));
LNETL1_DEBUG( "LNETL1: Disconnection event for %p %s", sockid, sockid->asString().c_str());
sockid->setConnectedState( false );
// Call callback if needed
if ( disconnectionCallback() != NULL )
{
disconnectionCallback()( sockid, argOfDisconnectionCallback() );
}
// remove from the list of valid client
nlverify(_ConnectedClients.erase(sockid) == 1);
// Add socket object into the synchronized remove list
LNETL1_DEBUG( "LNETL1: Adding the connection to the remove list" );
nlassert( ((CServerBufSock*)sockid)->ownerTask() != NULL );
((CServerBufSock*)sockid)->ownerTask()->addToRemoveSet( sockid );
break;
}
// Process connection event
case CBufNetBase::Connection:
{
TSockId sockid = *((TSockId*)(&*buffer.begin()));
LNETL1_DEBUG( "LNETL1: Connection event for %p %s", sockid, sockid->asString().c_str());
// add this socket in the list of client
nlverify(_ConnectedClients.insert(sockid).second);
sockid->setConnectedState( true );
// Call callback if needed
if ( connectionCallback() != NULL )
{
connectionCallback()( sockid, argOfConnectionCallback() );
}
break;
}
default: // should not occur
LNETL1_INFO( "LNETL1: Invalid block type: %hu (should be = to %hu", (uint16)(buffer[buffer.size()-1]), (uint16)(val) );
LNETL1_INFO( "LNETL1: Buffer (%d B): [%s]", buffer.size(), stringFromVector(buffer).c_str() );
LNETL1_INFO( "LNETL1: Receive queue:" );
{
CFifoAccessor recvfifo( &receiveQueue() );
recvfifo.value().display();
}
nlerror( "LNETL1: Invalid system event type in server receive queue" );
}
// Extract system event
{
CFifoAccessor recvfifo( &receiveQueue() );
recvfifo.value().pop();
setDataAvailableFlag( ! recvfifo.value().empty() );
}
}
// _DataAvailable is false here
return false;
}
}
#ifdef NL_OS_UNIX
/* Wait until the receive queue contains something to read (implemented with a select()).
* This is where the connection/disconnection callbacks can be called.
* \param usecMax Max time to wait in microsecond (up to 1 sec)
*/
void CBufServer::sleepUntilDataAvailable( uint usecMax )
{
// Prevent looping infinitely if the system time was changed
if ( usecMax > 999999 ) // limit not told in Linux man but here: http://docs.hp.com/en/B9106-90009/select.2.html
usecMax = 999999;
fd_set readers;
timeval tv;
do
{
FD_ZERO( &readers );
FD_SET( _DataAvailablePipeHandle[PipeRead], &readers );
tv.tv_sec = 0;
tv.tv_usec = usecMax;
int res = ::select( _DataAvailablePipeHandle[PipeRead]+1, &readers, NULL, NULL, &tv );
if ( res == -1 )
nlerror( "LNETL1: Select failed in sleepUntilDataAvailable (code %u)", CSock::getLastError() );
}
while ( ! dataAvailable() ); // will loop if only a connection/disconnection event was read
}
#endif
/*
* Receives next block of data in the specified. The length and hostid are output arguments.
* Precond: dataAvailable() has returned true, phostid not null
*/
void CBufServer::receive( CMemStream& buffer, TSockId* phostid )
{
nlnettrace( "CBufServer::receive" );
//nlassert( dataAvailable() );
nlassert( phostid != NULL );
{
CFifoAccessor recvfifo( &receiveQueue() );
nlassert( ! recvfifo.value().empty() );
recvfifo.value().front( buffer );
recvfifo.value().pop();
setDataAvailableFlag( ! recvfifo.value().empty() );
}
// Extract hostid (and event type)
*phostid = *((TSockId*)&(buffer.buffer()[buffer.size()-sizeof(TSockId)-1]));
nlassert( buffer.buffer()[buffer.size()-1] == CBufNetBase::User );
// debug features, we number all packet to be sure that they are all sent and received
// \todo remove this debug feature when ok
#ifdef NL_BIG_ENDIAN
uint32 val = NLMISC_BSWAP32(*(uint32*)buffer.buffer());
#else
uint32 val = *(uint32*)buffer.buffer();
#endif
buffer.resize( buffer.size()-sizeof(TSockId)-1 );
// TODO OPTIM remove the nldebug for speed
//commented for optimisation LNETL1_DEBUG( "LNETL1: Read buffer (%d+%d B) from %s", buffer.size(), sizeof(TSockId)+1, /*stringFromVector(buffer).c_str(), */(*phostid)->asString().c_str() );
// Statistics
_BytesPoppedIn += buffer.size() + sizeof(TBlockSize);
}
/*
* Update the network (call this method evenly)
*/
void CBufServer::update()
{
//nlnettrace( "CBufServer::update-BEGIN" );
_NbConnections = 0;
// For each thread
CThreadPool::iterator ipt;
{
//nldebug( "UPD: Acquiring the Thread Pool" );
CSynchronized<CThreadPool>::CAccessor poolsync( &_ThreadPool );
//nldebug( "UPD: Acquired." );
for ( ipt=poolsync.value().begin(); ipt!=poolsync.value().end(); ++ipt )
{
// For each thread of the pool
CServerReceiveTask *task = receiveTask(ipt);
CConnections::iterator ipb;
{
CSynchronized<CConnections>::CAccessor connectionssync( &task->_Connections );
for ( ipb=connectionssync.value().begin(); ipb!=connectionssync.value().end(); ++ipb )
{
// For each socket of the thread, update sending
if ( ! ((*ipb)->Sock->connected() && (*ipb)->update()) )
{
// Update did not work or the socket is not connected anymore
LNETL1_DEBUG( "LNETL1: Socket %s is disconnected", (*ipb)->asString().c_str() );
// Disconnection event if disconnected (known either from flush (in update) or when receiving data)
(*ipb)->advertiseDisconnection( this, *ipb );
/*if ( (*ipb)->advertiseDisconnection( this, *ipb ) )
{
// Now the connection removal is in dataAvailable()
// POLL6
}*/
}
else
{
_NbConnections++;
}
}
}
}
}
//nlnettrace( "CBufServer::update-END" );
}
uint32 CBufServer::getSendQueueSize( TSockId destid )
{
if ( destid != InvalidSockId )
{
if (_ConnectedClients.find(destid) == _ConnectedClients.end())
{
// this host is not connected
return 0;
}
return destid->SendFifo.size();
}
else
{
// add all client buffers
uint32 total = 0;
// For each thread
CThreadPool::iterator ipt;
{
CSynchronized<CThreadPool>::CAccessor poolsync( &_ThreadPool );
for ( ipt=poolsync.value().begin(); ipt!=poolsync.value().end(); ++ipt )
{
// For each thread of the pool
CServerReceiveTask *task = receiveTask(ipt);
CConnections::iterator ipb;
{
CSynchronized<CConnections>::CAccessor connectionssync( &task->_Connections );
for ( ipb=connectionssync.value().begin(); ipb!=connectionssync.value().end(); ++ipb )
{
// For each socket of the thread, update sending
total = (*ipb)->SendFifo.size ();
}
}
}
}
return total;
}
}
void CBufServer::displayThreadStat (NLMISC::CLog *log)
{
// For each thread
CThreadPool::iterator ipt;
{
CSynchronized<CThreadPool>::CAccessor poolsync( &_ThreadPool );
for ( ipt=poolsync.value().begin(); ipt!=poolsync.value().end(); ++ipt )
{
// For each thread of the pool
CServerReceiveTask *task = receiveTask(ipt);
// For each socket of the thread, update sending
log->displayNL ("server receive thread %p nbloop %d", task, task->NbLoop);
}
}
log->displayNL ("server listen thread %p nbloop %d", _ListenTask, _ListenTask->NbLoop);
}
void CBufServer::setTimeFlushTrigger( TSockId destid, sint32 ms )
{
nlassert( destid != InvalidSockId );
if (_ConnectedClients.find(destid) != _ConnectedClients.end())
destid->setTimeFlushTrigger( ms );
}
void CBufServer::setSizeFlushTrigger( TSockId destid, sint32 size )
{
nlassert( destid != InvalidSockId );
if (_ConnectedClients.find(destid) != _ConnectedClients.end())
destid->setSizeFlushTrigger( size );
}
bool CBufServer::flush( TSockId destid, uint *nbBytesRemaining)
{
nlassert( destid != InvalidSockId );
if (_ConnectedClients.find(destid) != _ConnectedClients.end())
return destid->flush( nbBytesRemaining );
else
return true;
}
const CInetAddress& CBufServer::hostAddress( TSockId hostid )
{
nlassert( hostid != InvalidSockId );
if (_ConnectedClients.find(hostid) != _ConnectedClients.end())
return hostid->Sock->remoteAddr();
static CInetAddress nullAddr;
return nullAddr;
}
void CBufServer::displaySendQueueStat (NLMISC::CLog *log, TSockId destid)
{
if ( destid != InvalidSockId )
{
if (_ConnectedClients.find(destid) == _ConnectedClients.end())
{
// this host is not connected
return;
}
destid->SendFifo.displayStats(log);
}
else
{
// add all client buffers
// For each thread
CThreadPool::iterator ipt;
{
CSynchronized<CThreadPool>::CAccessor poolsync( &_ThreadPool );
for ( ipt=poolsync.value().begin(); ipt!=poolsync.value().end(); ++ipt )
{
// For each thread of the pool
CServerReceiveTask *task = receiveTask(ipt);
CConnections::iterator ipb;
{
CSynchronized<CConnections>::CAccessor connectionssync( &task->_Connections );
for ( ipb=connectionssync.value().begin(); ipb!=connectionssync.value().end(); ++ipb )
{
// For each socket of the thread, update sending
(*ipb)->SendFifo.displayStats(log);
}
}
}
}
}
}
/*
* Returns the number of bytes received since the previous call to this method
*/
uint64 CBufServer::newBytesReceived()
{
uint64 b = bytesReceived();
uint64 nbrecvd = b - _PrevBytesPoppedIn;
//nlinfo( "b: %"NL_I64"u new: %"NL_I64"u", b, nbrecvd );
_PrevBytesPoppedIn = b;
return nbrecvd;
}
/*
* Returns the number of bytes sent since the previous call to this method
*/
uint64 CBufServer::newBytesSent()
{
uint64 b = bytesSent();
uint64 nbsent = b - _PrevBytesPushedOut;
//nlinfo( "b: %"NL_I64"u new: %"NL_I64"u", b, nbsent );
_PrevBytesPushedOut = b;
return nbsent;
}
/***************************************************************************************************
* Listen thread
**************************************************************************************************/
/*
* Code of listening thread
*/
void CListenTask::run()
{
NbNetworkTask++;
NbServerListenTask++;
nlnettrace( "CListenTask::run" );
fd_set readers;
#ifdef NL_OS_UNIX
SOCKET descmax;
descmax = _ListenSock.descriptor()>_WakeUpPipeHandle[PipeRead]?_ListenSock.descriptor():_WakeUpPipeHandle[PipeRead];
#endif
// Accept connections
while ( ! exitRequired() )
{
try
{
LNETL1_DEBUG( "LNETL1: Waiting incoming connection..." );
// Get and setup the new socket
#ifdef NL_OS_UNIX
FD_ZERO( &readers );
FD_SET( _ListenSock.descriptor(), &readers );
FD_SET( _WakeUpPipeHandle[PipeRead], &readers );
int res = ::select( descmax+1, &readers, NULL, NULL, NULL ); /// Wait indefinitely
switch ( res )
{
//case 0 : continue; // time-out expired, no results
case -1 :
// we'll ignore message (Interrupted system call) caused by a CTRL-C
if (CSock::getLastError() == 4)
{
LNETL1_DEBUG ("LNETL1: Select failed (in listen thread): %s (code %u) but IGNORED", CSock::errorString( CSock::getLastError() ).c_str(), CSock::getLastError());
continue;
}
nlerror( "LNETL1: Select failed (in listen thread): %s (code %u)", CSock::errorString( CSock::getLastError() ).c_str(), CSock::getLastError() );
}
if ( FD_ISSET( _WakeUpPipeHandle[PipeRead], &readers ) )
{
uint8 b;
if ( read( _WakeUpPipeHandle[PipeRead], &b, 1 ) == -1 ) // we were woken-up by the wake-up pipe
{
LNETL1_DEBUG( "LNETL1: In CListenTask::run(): read() failed" );
}
LNETL1_DEBUG( "LNETL1: listen thread select woken-up" );
continue;
}
#elif defined (NL_OS_WINDOWS)
FD_ZERO( &readers );
FD_SET( _ListenSock.descriptor(), &readers );
int res = ::select( 1, &readers, NULL, NULL, NULL ); /// Wait indefinitely
if ( res == -1)
{
nlerror( "LNETL1: Select failed (in listen thread): %s (code %u)", CSock::errorString( CSock::getLastError() ).c_str(), CSock::getLastError() );
continue;
}
#endif
LNETL1_DEBUG( "LNETL1: Accepting an incoming connection..." );
CTcpSock *newSock = _ListenSock.accept();
if (newSock != NULL)
{
CServerBufSock *bufsock = new CServerBufSock( newSock );
LNETL1_DEBUG( "LNETL1: New connection : %s", bufsock->asString().c_str() );
bufsock->setNonBlocking();
bufsock->setMaxExpectedBlockSize( _MaxExpectedBlockSize );
if ( _Server->noDelay() )
{
bufsock->Sock->setNoDelay( true );
}
// Notify the new connection
bufsock->advertiseConnection( _Server );
// Dispatch the socket into the thread pool
_Server->dispatchNewSocket( bufsock );
}
NbLoop++;
}
catch ( ESocket& e )
{
LNETL1_INFO( "LNETL1: Exception in listen thread: %s", e.what() );
// It can occur when too many sockets are open (e.g. 885 connections)
}
}
nlnettrace( "Exiting CListenTask::run" );
NbServerListenTask--;
NbNetworkTask--;
}
/// Close listening socket
void CListenTask::close()
{
_ListenSock.close();
// _ListenSock.disconnect();
}
/*
* Binds a new socket and send buffer to an existing or a new thread
* Note: this method is called in the listening thread.
*/
void CBufServer::dispatchNewSocket( CServerBufSock *bufsock )
{
nlnettrace( "CBufServer::dispatchNewSocket" );
CSynchronized<CThreadPool>::CAccessor poolsync( &_ThreadPool );
if ( _ThreadStrategy == SpreadSockets )
{
// Find the thread with the smallest number of connections and check if all
// threads do not have the same number of connections
uint min = 0xFFFFFFFF;
uint max = 0;
CThreadPool::iterator ipt, iptmin, iptmax;
for ( iptmin=iptmax=ipt=poolsync.value().begin(); ipt!=poolsync.value().end(); ++ipt )
{
uint noc = receiveTask(ipt)->numberOfConnections();
if ( noc < min )
{
min = noc;
iptmin = ipt;
}
if ( noc > max )
{
max = noc;
iptmax = ipt;
}
}
// Check if we make the pool of threads grow (if we have not found vacant room
// and if it is allowed to)
if ( (poolsync.value().empty()) ||
((min == max) && (poolsync.value().size() < _MaxThreads)) )
{
addNewThread( poolsync.value(), bufsock );
}
else
{
// Dispatch socket to an existing thread of the pool
CServerReceiveTask *task = receiveTask(iptmin);
bufsock->setOwnerTask( task );
task->addNewSocket( bufsock );
#ifdef NL_OS_UNIX
task->wakeUp();
#endif
if ( min >= (uint)_MaxSocketsPerThread )
{
nlwarning( "LNETL1: Exceeding the maximum number of sockets per thread" );
}
LNETL1_DEBUG( "LNETL1: New socket dispatched to thread %d", iptmin-poolsync.value().begin() );
}
}
else // _ThreadStrategy == FillThreads
{
CThreadPool::iterator ipt;
for ( ipt=poolsync.value().begin(); ipt!=poolsync.value().end(); ++ipt )
{
uint noc = receiveTask(ipt)->numberOfConnections();
if ( noc < _MaxSocketsPerThread )
{
break;
}
}
// Check if we have to make the thread pool grow (if we have not found vacant room)
if ( ipt == poolsync.value().end() )
{
if ( poolsync.value().size() == _MaxThreads )
{
nlwarning( "LNETL1: Exceeding the maximum number of threads" );
}
addNewThread( poolsync.value(), bufsock );
}
else
{
// Dispatch socket to an existing thread of the pool
CServerReceiveTask *task = receiveTask(ipt);
bufsock->setOwnerTask( task );
task->addNewSocket( bufsock );
#ifdef NL_OS_UNIX
task->wakeUp();
#endif
LNETL1_DEBUG( "LNETL1: New socket dispatched to thread %d", ipt-poolsync.value().begin() );
}
}
}
/*
* Creates a new task and run a new thread for it
* Precond: bufsock not null
*/
void CBufServer::addNewThread( CThreadPool& threadpool, CServerBufSock *bufsock )
{
nlnettrace( "CBufServer::addNewThread" );
nlassert( bufsock != NULL );
// Create new task and dispatch the socket to it
CServerReceiveTask *task = new CServerReceiveTask( this );
bufsock->setOwnerTask( task );
task->addNewSocket( bufsock );
// Add a new thread to the pool, with this task
IThread *thr = IThread::create( task, 1024*4*4 );
{
threadpool.push_back( thr );
thr->start();
LNETL1_DEBUG( "LNETL1: Added a new thread; pool size is %d", threadpool.size() );
LNETL1_DEBUG( "LNETL1: New socket dispatched to thread %d", threadpool.size()-1 );
}
}
/***************************************************************************************************
* Receive threads
**************************************************************************************************/
/*
* Code of receiving threads for servers
*/
void CServerReceiveTask::run()
{
NbNetworkTask++;
NbServerReceiveTask++;
nlnettrace( "CServerReceiveTask::run" );
SOCKET descmax;
fd_set readers;
#if defined NL_OS_UNIX
// POLL7
if (nice( 2 ) == -1) // is this really useful as long as select() sleeps?
{
nlwarning("LNETL1: nice() failed: code=%d '%s'", errno, strerror(errno));
}
#endif // NL_OS_UNIX
// Copy of _Connections
vector<TSockId> connections_copy;
while ( ! exitRequired() )
{
// 1. Remove closed connections
clearClosedConnections();
// POLL8
// 2-SELECT-VERSION : select() on the sockets handled in the present thread
descmax = 0;
FD_ZERO( &readers );
bool skip;
bool alldisconnected = true;
CConnections::iterator ipb;
{
// Lock _Connections
CSynchronized<CConnections>::CAccessor connectionssync( &_Connections );
// Prepare to avoid select if there is no connection
skip = connectionssync.value().empty();
// Fill the select array and copy _Connections
connections_copy.clear();
for ( ipb=connectionssync.value().begin(); ipb!=connectionssync.value().end(); ++ipb )
{
if ( (*ipb)->Sock->connected() ) // exclude disconnected sockets that are not deleted
{
alldisconnected = false;
// Copy _Connections element
connections_copy.push_back( *ipb );
// Add socket descriptor to the select array
FD_SET( (*ipb)->Sock->descriptor(), &readers );
// Calculate descmax for select
if ( (*ipb)->Sock->descriptor() > descmax )
{
descmax = (*ipb)->Sock->descriptor();
}
}
}
#ifdef NL_OS_UNIX
// Add the wake-up pipe into the select array
FD_SET( _WakeUpPipeHandle[PipeRead], &readers );
if ( _WakeUpPipeHandle[PipeRead]>descmax )
{
descmax = _WakeUpPipeHandle[PipeRead];
}
#endif
// Unlock _Connections, use connections_copy instead
}
#ifndef NL_OS_UNIX
// Avoid select if there is no connection (Windows only)
if ( skip || alldisconnected )
{
nlSleep( 1 ); // nice
continue;
}
#endif
#ifdef NL_OS_WINDOWS
TIMEVAL tv;
tv.tv_sec = 0; // short time because the newly added connections can't be added to the select fd_set
tv.tv_usec = 10000;
// Call select
int res = ::select( descmax+1, &readers, NULL, NULL, &tv );
#elif defined NL_OS_UNIX
// Call select
int res = ::select( descmax+1, &readers, NULL, NULL, NULL );
#endif // NL_OS_WINDOWS
// POLL9
// 3. Test the result
switch ( res )
{
#ifdef NL_OS_WINDOWS
case 0 : continue; // time-out expired, no results
#endif
case -1 :
// we'll ignore message (Interrupted system call) caused by a CTRL-C
/*if (CSock::getLastError() == 4)
{
LNETL1_DEBUG ("LNETL1: Select failed (in receive thread): %s (code %u) but IGNORED", CSock::errorString( CSock::getLastError() ).c_str(), CSock::getLastError());
continue;
}*/
//nlerror( "LNETL1: Select failed (in receive thread): %s (code %u)", CSock::errorString( CSock::getLastError() ).c_str(), CSock::getLastError() );
LNETL1_DEBUG( "LNETL1: Select failed (in receive thread): %s (code %u)", CSock::errorString( CSock::getLastError() ).c_str(), CSock::getLastError() );
goto end;
}
// 4. Get results
vector<TSockId>::iterator ic;
for ( ic=connections_copy.begin(); ic!=connections_copy.end(); ++ic )
{
if ( FD_ISSET( (*ic)->Sock->descriptor(), &readers ) != 0 )
{
CServerBufSock *serverbufsock = static_cast<CServerBufSock*>(static_cast<CBufSock*>(*ic));
try
{
// 4. Receive data
if ( serverbufsock->receivePart( sizeof(TSockId) + 1 ) ) // +1 for the event type
{
serverbufsock->fillSockIdAndEventType( *ic );
// Push message into receive queue
//uint32 bufsize;
//sint32 mbsize;
_Server->pushMessageIntoReceiveQueue( serverbufsock->receivedBuffer() );
//recvfifo.value().display();
//bufsize = serverbufsock->receivedBuffer().size();
//mbsize = recvfifo.value().size() / 1048576;
//nldebug( "RCV: Released." );
/*if ( mbsize > 1 )
{
nlwarning( "The receive queue size exceeds %d MB", mbsize );
}*/
/*
// Statistics
{
CSynchronized<uint32>::CAccessor syncbpi ( &_Server->syncBytesPushedIn() );
syncbpi.value() += bufsize;
}
*/
}
}
// catch ( ESocketConnectionClosed& )
// {
// LNETL1_DEBUG( "LNETL1: Connection %s closed", serverbufsock->asString().c_str() );
// // The socket went to _Connected=false when throwing the exception
// }
catch ( ESocket& )
{
LNETL1_DEBUG( "LNETL1: Connection %s broken", serverbufsock->asString().c_str() );
(*ic)->Sock->disconnect();
}
/*
#ifdef NL_OS_UNIX
skip = true; // don't check _WakeUpPipeHandle (yes, check it to read any written byte)
#endif
*/
}
}
#ifdef NL_OS_UNIX
// Test wake-up pipe
if ( (!skip) && (FD_ISSET( _WakeUpPipeHandle[PipeRead], &readers )) )
{
uint8 b;
if ( read( _WakeUpPipeHandle[PipeRead], &b, 1 ) == -1 ) // we were woken-up by the wake-up pipe
{
LNETL1_DEBUG( "LNETL1: In CServerReceiveTask::run(): read() failed" );
}
LNETL1_DEBUG( "LNETL1: Receive thread select woken-up" );
}
#endif
NbLoop++;
}
end:
nlnettrace( "Exiting CServerReceiveTask::run" );
NbServerReceiveTask--;
NbNetworkTask--;
}
/*
* Delete all connections referenced in the remove list (double-mutexed)
*/
void CServerReceiveTask::clearClosedConnections()
{
CConnections::iterator ic;
{
NLMISC::CSynchronized<CConnections>::CAccessor removesetsync( &_RemoveSet );
{
if ( ! removesetsync.value().empty() )
{
// Delete closed connections
NLMISC::CSynchronized<CConnections>::CAccessor connectionssync( &_Connections );
for ( ic=removesetsync.value().begin(); ic!=removesetsync.value().end(); ++ic )
{
LNETL1_DEBUG( "LNETL1: Removing a connection" );
TSockId sid = (*ic);
// Remove from the connection list
connectionssync.value().erase( *ic );
// Delete the socket object
delete sid;
}
// Clear remove list
removesetsync.value().clear();
}
}
}
}
NLMISC_CATEGORISED_VARIABLE(nel, uint32, NbServerListenTask, "Number of server listen thread");
NLMISC_CATEGORISED_VARIABLE(nel, uint32, NbServerReceiveTask, "Number of server receive thread");
} // NLNET
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