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tdelibs/win/qeventloopex.cpp

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/*
This file is part of the KDE libraries
Copyright (C) 2005 Andreas Roth <aroth@arsoft-online.com>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License version 2 as published by the Free Software Foundation.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#include <windows.h>
#include <string.h>
#include <stdlib.h>
#include <io.h>
#include <stdio.h>
#include <qeventloop.h>
#include <qapplication.h>
#include "qeventloopex.h"
// Local defined structures and classes (needed only for QEventLoopEx implementation)
struct QSockNotEx
{
QSocketNotifier *obj;
int fd;
fd_set *queue;
};
class QSockNotTypeEx
{
public:
QSockNotTypeEx();
~QSockNotTypeEx();
QPtrList<QSockNotEx> *list;
fd_set select_fds;
fd_set enabled_fds;
fd_set pending_fds;
};
class QEventLoopExPrivate
{
public:
QEventLoopExPrivate()
{
reset();
}
void reset() {
m_bStopped = false;
m_hThread = NULL;
m_sockUpdate = 0;
m_evPendingListEmpty = NULL;
sn_highest = 0;
}
bool m_bStopped;
HANDLE m_hThread;
SOCKET m_sockUpdate;
// pending socket notifiers list
QPtrList<QSockNotEx> sn_pending_list;
HANDLE m_evPendingListEmpty;
CRITICAL_SECTION m_csPendingList;
// highest fd for all socket notifiers
int sn_highest;
// 3 socket notifier types - read, write and exception
QSockNotTypeEx sn_vec[3];
CRITICAL_SECTION m_csVec;
};
/*****************************************************************************
Socket notifier type
*****************************************************************************/
QSockNotTypeEx::QSockNotTypeEx()
: list( 0 )
{
FD_ZERO( &select_fds );
FD_ZERO( &enabled_fds );
FD_ZERO( &pending_fds );
}
QSockNotTypeEx::~QSockNotTypeEx()
{
delete list;
list = 0;
}
QEventLoopEx::QEventLoopEx( QObject *parent, const char *name) :
QEventLoop(parent,name)
{
DWORD dwThreadId;
#ifdef _DEBUG_EVENTLOOPEX
qDebug( "QEventLoopEx::QEventLoopEx enter");
#endif
d = new QEventLoopExPrivate;
InitializeCriticalSection(&d->m_csVec);
InitializeCriticalSection(&d->m_csPendingList);
d->m_evPendingListEmpty = CreateEvent(NULL,TRUE,FALSE,NULL);
d->m_sockUpdate = socket(AF_INET,SOCK_DGRAM,0);
d->m_hThread = CreateThread(NULL,0,ThreadProc,this,0,&dwThreadId);
#ifdef _DEBUG_EVENTLOOPEX
qDebug( "QEventLoopEx::QEventLoopEx leave");
#endif
}
QEventLoopEx::~QEventLoopEx()
{
#ifdef _DEBUG_EVENTLOOPEX
qDebug( "QEventLoopEx::~QEventLoopEx enter");
#endif
d->m_bStopped = true;
// Ensure that you thread gets unblocked and can terminate gracefully
SetEvent(d->m_evPendingListEmpty);
closesocket(d->m_sockUpdate);
WaitForSingleObject(d->m_hThread,INFINITE);
CloseHandle(d->m_hThread);
CloseHandle(d->m_evPendingListEmpty);
DeleteCriticalSection(&d->m_csVec);
DeleteCriticalSection(&d->m_csPendingList);
delete d;
#ifdef _DEBUG_EVENTLOOPEX
qDebug( "QEventLoopEx::~QEventLoopEx leave");
#endif
}
/*****************************************************************************
QEventLoopEx implementations for Windows (for synchronous socket calls)
*****************************************************************************/
void QEventLoopEx::registerSocketNotifier( QSocketNotifier *notifier )
{
int sockfd = notifier->socket();
int type = notifier->type();
u_long n;
DWORD dw;
#ifdef _DEBUG_EVENTLOOPEX
qDebug( "QSocketNotifier::registerSocketNotifier %p", notifier );
#endif
if(ioctlsocket(sockfd,FIONREAD,&n) == SOCKET_ERROR)
{
#ifdef _DEBUG_EVENTLOOPEX
qDebug( "QSocketNotifier::registerSocketNotifier %p not a socket", notifier );
#endif
dw = WSAGetLastError();
QEventLoop::registerSocketNotifier(notifier);
return;
}
if ( sockfd < 0 || type < 0 || type > 2 || notifier == 0 )
{
#if defined(QT_CHECK_RANGE)
qWarning( "QSocketNotifier: Internal error" );
#endif
return;
}
EnterCriticalSection(&d->m_csVec);
QPtrList<QSockNotEx> *list = d->sn_vec[type].list;
fd_set *fds = &d->sn_vec[type].enabled_fds;
QSockNotEx *sn;
if ( ! list ) {
// create new list, the QSockNotType destructor will delete it for us
list = new QPtrList<QSockNotEx>;
Q_CHECK_PTR( list );
list->setAutoDelete( TRUE );
d->sn_vec[type].list = list;
}
sn = new QSockNotEx;
Q_CHECK_PTR( sn );
sn->obj = notifier;
sn->fd = sockfd;
sn->queue = &d->sn_vec[type].pending_fds;
if ( list->isEmpty() ) {
list->insert( 0, sn );
} else { // sort list by fd, decreasing
QSockNotEx *p = list->first();
while ( p && p->fd > sockfd )
p = list->next();
if ( p )
list->insert( list->at(), sn );
else
list->append( sn );
}
FD_SET( sockfd, fds );
d->sn_highest = QMAX( d->sn_highest, sockfd );
LeaveCriticalSection(&d->m_csVec);
#ifdef _DEBUG_EVENTLOOPEX
qDebug( "QSocketNotifier::signal update socket");
#endif
closesocket(d->m_sockUpdate);
}
void QEventLoopEx::unregisterSocketNotifier( QSocketNotifier *notifier )
{
int sockfd = notifier->socket();
int type = notifier->type();
if ( sockfd < 0 || type < 0 || type > 2 || notifier == 0 ) {
#if defined(QT_CHECK_RANGE)
qWarning( "QSocketNotifier: Internal error" );
#endif
return;
}
#ifdef _DEBUG_EVENTLOOPEX
qDebug( "QSocketNotifier::unregisterSocketNotifier %p", notifier );
#endif
EnterCriticalSection(&d->m_csVec);
QPtrList<QSockNotEx> *list = d->sn_vec[type].list;
fd_set *fds = &d->sn_vec[type].enabled_fds;
QSockNotEx *sn;
if ( ! list ) {
LeaveCriticalSection(&d->m_csVec);
QEventLoop::unregisterSocketNotifier(notifier);
return;
}
sn = list->first();
while ( sn && !(sn->obj == notifier && sn->fd == sockfd) )
sn = list->next();
if ( !sn ) {// not found
LeaveCriticalSection(&d->m_csVec);
QEventLoop::unregisterSocketNotifier(notifier);
return;
}
FD_CLR( sockfd, fds ); // clear fd bit
FD_CLR( sockfd, sn->queue );
EnterCriticalSection(&d->m_csPendingList);
d->sn_pending_list.removeRef( sn ); // remove from activation list
bool bNowEmpty = (d->sn_pending_list.count() == 0);
LeaveCriticalSection(&d->m_csPendingList);
if(bNowEmpty)
SetEvent(d->m_evPendingListEmpty);
list->remove(); // remove notifier found above
if ( d->sn_highest == sockfd ) {// find highest fd
d->sn_highest = -1;
for ( int i=0; i<3; i++ ) {
if ( d->sn_vec[i].list && ! d->sn_vec[i].list->isEmpty() )
d->sn_highest = QMAX( d->sn_highest, // list is fd-sorted
d->sn_vec[i].list->getFirst()->fd );
}
}
LeaveCriticalSection(&d->m_csVec);
#ifdef _DEBUG_EVENTLOOPEX
qDebug( "QSocketNotifier::signal update socket");
#endif
closesocket(d->m_sockUpdate);
}
bool QEventLoopEx::processEvents( ProcessEventsFlags flags )
{
if(!QEventLoop::processEvents(flags))
return false;
activateSocketNotifiers();
return true;
}
void QEventLoopEx::setSocketNotifierPending( QSocketNotifier *notifier )
{
int sockfd = notifier->socket();
int type = notifier->type();
if ( sockfd < 0 || type < 0 || type > 2 || notifier == 0 )
{
#if defined(QT_CHECK_RANGE)
qWarning( "QSocketNotifier: Internal error" );
#endif
return;
}
#ifdef _DEBUG_EVENTLOOPEX
qDebug( "QSocketNotifier::setSocketNotifierPending %p",notifier );
#endif
EnterCriticalSection(&d->m_csVec);
QPtrList<QSockNotEx> *list = d->sn_vec[type].list;
QSockNotEx *sn;
if ( ! list )
{
#ifdef _DEBUG_EVENTLOOPEX
qDebug( "QSocketNotifier::setSocketNotifierPending %p: no list",notifier );
#endif
LeaveCriticalSection(&d->m_csVec);
return;
}
sn = list->first();
while ( sn && !(sn->obj == notifier && sn->fd == sockfd) )
sn = list->next();
if ( ! sn ) { // not found
#ifdef _DEBUG_EVENTLOOPEX
qDebug( "QSocketNotifier::setSocketNotifierPending %p: not found",notifier );
#endif
LeaveCriticalSection(&d->m_csVec);
return;
}
// We choose a random activation order to be more fair under high load.
// If a constant order is used and a peer early in the list can
// saturate the IO, it might grab our attention completely.
// Also, if we're using a straight list, the callback routines may
// delete other entries from the list before those other entries are
// processed.
EnterCriticalSection(&d->m_csPendingList);
if ( ! FD_ISSET( sn->fd, sn->queue ) ) {
d->sn_pending_list.insert( (rand() & 0xff) %
(d->sn_pending_list.count()+1), sn );
FD_SET( sn->fd, sn->queue );
}
LeaveCriticalSection(&d->m_csPendingList);
LeaveCriticalSection(&d->m_csVec);
}
int QEventLoopEx::activateSocketNotifiers()
{
if ( d->sn_pending_list.isEmpty() )
return 0; // nothing to do
int n_act = 0;
QEvent event( QEvent::SockAct );
EnterCriticalSection(&d->m_csVec); // Avoid deaklock
EnterCriticalSection(&d->m_csPendingList);
QPtrListIterator<QSockNotEx> it( d->sn_pending_list );
QSockNotEx *sn;
while ( (sn=it.current()) ) {
++it;
d->sn_pending_list.removeRef( sn );
if ( FD_ISSET(sn->fd, sn->queue) ) {
FD_CLR( sn->fd, sn->queue );
#ifdef _DEBUG_EVENTLOOPEX
qDebug("QEventLoopEx:activateSocketNotifiers %p to object %p",sn, sn->obj);
#endif
QApplication::sendEvent( sn->obj, &event );
n_act++;
}
}
LeaveCriticalSection(&d->m_csPendingList);
LeaveCriticalSection(&d->m_csVec); // Avoid deaklock
#ifdef _DEBUG_EVENTLOOPEX
qDebug( "QSocketNotifier::activateSocketNotifiers set m_evPendingListEmpty");
#endif
SetEvent(d->m_evPendingListEmpty);
return n_act;
}
DWORD QEventLoopEx::ThreadProc(void * p)
{
QEventLoopEx * pEventLoopEx = static_cast<QEventLoopEx *>(p);
pEventLoopEx->run();
return 0;
}
void QEventLoopEx::run()
{
do
{
EnterCriticalSection(&d->m_csVec);
// return the highest fd we can wait for input on
if ( d->sn_highest >= 0 ) { // has socket notifier(s)
if ( d->sn_vec[0].list && ! d->sn_vec[0].list->isEmpty() )
d->sn_vec[0].select_fds = d->sn_vec[0].enabled_fds;
else
FD_ZERO( &d->sn_vec[0].select_fds );
if ( d->sn_vec[1].list && ! d->sn_vec[1].list->isEmpty() )
d->sn_vec[1].select_fds = d->sn_vec[1].enabled_fds;
else
FD_ZERO( &d->sn_vec[1].select_fds );
if ( d->sn_vec[2].list && ! d->sn_vec[2].list->isEmpty() )
d->sn_vec[2].select_fds = d->sn_vec[2].enabled_fds;
else
FD_ZERO( &d->sn_vec[2].select_fds );
}
else {
FD_ZERO( &d->sn_vec[0].select_fds );
FD_ZERO( &d->sn_vec[1].select_fds );
FD_ZERO( &d->sn_vec[2].select_fds );
}
FD_SET(d->m_sockUpdate,&d->sn_vec[0].select_fds);
d->sn_highest = QMAX(d->sn_highest,(int)d->m_sockUpdate);
// FD_SET(m_sockUpdate,&sn_vec[1].select_fds);
// FD_SET(m_sockUpdate,&sn_vec[2].select_fds);
LeaveCriticalSection(&d->m_csVec);
#ifdef _DEBUG_EVENTLOOPEX
qDebug("QEventLoopEx: select(%d,%d, %d, %d)",sn_highest,sn_vec[0].select_fds.fd_count,sn_vec[1].select_fds.fd_count,sn_vec[2].select_fds.fd_count);
#endif
int nsel = select( d->sn_highest,
&d->sn_vec[0].select_fds,
&d->sn_vec[1].select_fds,
&d->sn_vec[2].select_fds,
NULL );
#ifdef _DEBUG_EVENTLOOPEX
qDebug("QEventLoopEx: select returned %d",nsel);
#endif
if (nsel == SOCKET_ERROR) {
if (WSAGetLastError() == WSAENOTSOCK) {
// it seems a socket notifier has a bad fd... find out
// which one it is and disable it
fd_set fdset;
struct timeval zerotm;
int ret;
zerotm.tv_sec = zerotm.tv_usec = 0l;
FD_ZERO(&fdset);
FD_SET(d->m_sockUpdate, &fdset);
ret = select(d->m_sockUpdate + 1, &fdset, 0, 0, &zerotm);
if(ret == SOCKET_ERROR && WSAGetLastError() == WSAENOTSOCK)
{
// Update the waiting sockets
d->m_sockUpdate = socket(AF_INET,SOCK_DGRAM,0);
}
else
{
EnterCriticalSection(&d->m_csVec);
for (int type = 0; type < 3; ++type)
{
QPtrList<QSockNotEx> *list = d->sn_vec[type].list;
if (!list)
continue;
QSockNotEx *sn = list->first();
while (sn) {
FD_ZERO(&fdset);
FD_SET(sn->fd, &fdset);
do {
switch (type) {
case 0: // read
ret = select(sn->fd + 1, &fdset, 0, 0, &zerotm);
break;
case 1: // write
ret = select(sn->fd + 1, 0, &fdset, 0, &zerotm);
break;
case 2: // except
ret = select(sn->fd + 1, 0, 0, &fdset, &zerotm);
break;
}
} while (ret == SOCKET_ERROR && WSAGetLastError() != WSAENOTSOCK);
if (ret == SOCKET_ERROR && WSAGetLastError() == WSAENOTSOCK)
{
// disable the invalid socket notifier
static const char *t[] = { "Read", "Write", "Exception" };
qWarning("QSocketNotifier: invalid socket %d and type '%s', disabling...",
sn->fd, t[type]);
sn->obj->setEnabled(FALSE);
}
sn = list->next();
}
}
LeaveCriticalSection(&d->m_csVec);
}
} else {
// EINVAL... shouldn't happen, so let's complain to stderr
// and hope someone sends us a bug report
DWORD dw = WSAGetLastError();
qWarning("QEventLoopEx: select failed with error %i\n",dw);
}
}
else
{
EnterCriticalSection(&d->m_csVec);
if(FD_ISSET( d->m_sockUpdate, &d->sn_vec[0].select_fds))
{
d->m_sockUpdate = socket(AF_INET,SOCK_DGRAM,0);
#ifdef _DEBUG_EVENTLOOPEX
qDebug("QEventLoopEx: update socket signaled -> recreate it %i",d->m_sockUpdate);
#endif
}
// if select says data is ready on any socket, then set the socket notifier
// to pending
int i;
for ( i=0; i<3; i++ )
{
if ( ! d->sn_vec[i].list )
continue;
QPtrList<QSockNotEx> *list = d->sn_vec[i].list;
QSockNotEx *sn = list->first();
while ( sn ) {
if ( FD_ISSET( sn->fd, &d->sn_vec[i].select_fds ) )
{
QEvent event( QEvent::SockAct );
setSocketNotifierPending( sn->obj );
}
sn = list->next();
}
}
LeaveCriticalSection(&d->m_csVec);
}
if(!d->sn_pending_list.isEmpty() )
{
QApplication::eventLoop()->wakeUp();
#ifdef _DEBUG_EVENTLOOPEX
qDebug("QEventLoopEx: wake up main event loop and wait for pending list empty");
#endif
WaitForSingleObject(d->m_evPendingListEmpty,INFINITE);
#ifdef _DEBUG_EVENTLOOPEX
qDebug("QEventLoopEx: pending list now empty again");
#endif
ResetEvent(d->m_evPendingListEmpty);
}
}
while(!d->m_bStopped);
}
#include "qeventloopex.moc"
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