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+/****************************************************************************
+**
+** Implementation of TQEventLoop class
+**
+** Copyright (C) 2000-2008 Trolltech ASA. All rights reserved.
+**
+** This file is part of the kernel module of the TQt GUI Toolkit.
+**
+** This file may be used under the terms of the GNU General
+** Public License versions 2.0 or 3.0 as published by the Free
+** Software Foundation and appearing in the files LICENSE.GPL2
+** and LICENSE.GPL3 included in the packaging of this file.
+** Alternatively you may (at your option) use any later version
+** of the GNU General Public License if such license has been
+** publicly approved by Trolltech ASA (or its successors, if any)
+** and the KDE Free TQt Foundation.
+**
+** Please review the following information to ensure GNU General
+** Public Licensing retquirements will be met:
+** http://trolltech.com/products/qt/licenses/licensing/opensource/.
+** If you are unsure which license is appropriate for your use, please
+** review the following information:
+** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
+** or contact the sales department at [email protected].
+**
+** This file may be used under the terms of the Q Public License as
+** defined by Trolltech ASA and appearing in the file LICENSE.TQPL
+** included in the packaging of this file. Licensees holding valid TQt
+** Commercial licenses may use this file in accordance with the TQt
+** Commercial License Agreement provided with the Software.
+**
+** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
+** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted
+** herein.
+**
+**********************************************************************/
+
+#include "qeventloop_p.h" // includes qplatformdefs.h
+#include "qeventloop.h"
+#include "qapplication.h"
+#include "qbitarray.h"
+#include <stdlib.h>
+#include <sys/types.h>
+
+
+/*****************************************************************************
+ Timer handling; UNIX has no application timer support so we'll have to
+ make our own from scratch.
+
+ NOTE: These functions are for internal use. TQObject::startTimer() and
+ TQObject::killTimer() are for public use.
+ The TQTimer class provides a high-level interface which translates
+ timer events into signals.
+
+ qStartTimer( interval, obj )
+ Starts a timer which will run until it is killed with qKillTimer()
+ Arguments:
+ int interval timer interval in milliseconds
+ TQObject *obj where to send the timer event
+ Returns:
+ int timer identifier, or zero if not successful
+
+ qKillTimer( timerId )
+ Stops a timer specified by a timer identifier.
+ Arguments:
+ int timerId timer identifier
+ Returns:
+ bool TRUE if successful
+
+ qKillTimer( obj )
+ Stops all timers that are sent to the specified object.
+ Arguments:
+ TQObject *obj object receiving timer events
+ Returns:
+ bool TRUE if successful
+ *****************************************************************************/
+
+//
+// Internal data structure for timers
+//
+
+struct TimerInfo { // internal timer info
+ int id; // - timer identifier
+ timeval interval; // - timer interval
+ timeval timeout; // - when to sent event
+ TQObject *obj; // - object to receive event
+};
+
+typedef TQPtrList<TimerInfo> TimerList; // list of TimerInfo structs
+
+static TQBitArray *timerBitVec; // timer bit vector
+static TimerList *timerList = 0; // timer list
+
+static void initTimers();
+void cleanupTimers();
+static timeval watchtime; // watch if time is turned back
+timeval *qt_wait_timer();
+timeval *qt_wait_timer_max = 0;
+
+//
+// Internal operator functions for timevals
+//
+
+static inline bool operator<( const timeval &t1, const timeval &t2 )
+{
+ return t1.tv_sec < t2.tv_sec ||
+ (t1.tv_sec == t2.tv_sec && t1.tv_usec < t2.tv_usec);
+}
+
+static inline bool operator==( const timeval &t1, const timeval &t2 )
+{
+ return t1.tv_sec == t2.tv_sec && t1.tv_usec == t2.tv_usec;
+}
+
+static inline timeval &operator+=( timeval &t1, const timeval &t2 )
+{
+ t1.tv_sec += t2.tv_sec;
+ if ( (t1.tv_usec += t2.tv_usec) >= 1000000 ) {
+ t1.tv_sec++;
+ t1.tv_usec -= 1000000;
+ }
+ return t1;
+}
+
+static inline timeval operator+( const timeval &t1, const timeval &t2 )
+{
+ timeval tmp;
+ tmp.tv_sec = t1.tv_sec + t2.tv_sec;
+ if ( (tmp.tv_usec = t1.tv_usec + t2.tv_usec) >= 1000000 ) {
+ tmp.tv_sec++;
+ tmp.tv_usec -= 1000000;
+ }
+ return tmp;
+}
+
+static inline timeval operator-( const timeval &t1, const timeval &t2 )
+{
+ timeval tmp;
+ tmp.tv_sec = t1.tv_sec - t2.tv_sec;
+ if ( (tmp.tv_usec = t1.tv_usec - t2.tv_usec) < 0 ) {
+ tmp.tv_sec--;
+ tmp.tv_usec += 1000000;
+ }
+ return tmp;
+}
+
+
+//
+// Internal functions for manipulating timer data structures.
+// The timerBitVec array is used for keeping track of timer identifiers.
+//
+
+static int allocTimerId() // find avail timer identifier
+{
+ int i = timerBitVec->size()-1;
+ while ( i >= 0 && (*timerBitVec)[i] )
+ i--;
+ if ( i < 0 ) {
+ i = timerBitVec->size();
+ timerBitVec->resize( 4 * i );
+ for( int j=timerBitVec->size()-1; j > i; j-- )
+ timerBitVec->clearBit( j );
+ }
+ timerBitVec->setBit( i );
+ return i+1;
+}
+
+static void insertTimer( const TimerInfo *ti ) // insert timer info into list
+{
+ TimerInfo *t = timerList->first();
+ int index = 0;
+#if defined(QT_DEBUG)
+ int dangerCount = 0;
+#endif
+ while ( t && t->timeout < ti->timeout ) { // list is sorted by timeout
+#if defined(QT_DEBUG)
+ if ( t->obj == ti->obj )
+ dangerCount++;
+#endif
+ t = timerList->next();
+ index++;
+ }
+ timerList->insert( index, ti ); // inserts sorted
+#if defined(QT_DEBUG)
+ if ( dangerCount > 16 )
+ qDebug( "TQObject: %d timers now exist for object %s::%s",
+ dangerCount, ti->obj->className(), ti->obj->name() );
+#endif
+}
+
+static inline void getTime( timeval &t ) // get time of day
+{
+ gettimeofday( &t, 0 );
+ while ( t.tv_usec >= 1000000 ) { // NTP-related fix
+ t.tv_usec -= 1000000;
+ t.tv_sec++;
+ }
+ while ( t.tv_usec < 0 ) {
+ if ( t.tv_sec > 0 ) {
+ t.tv_usec += 1000000;
+ t.tv_sec--;
+ } else {
+ t.tv_usec = 0;
+ break;
+ }
+ }
+}
+
+static void repairTimer( const timeval &time ) // repair broken timer
+{
+ timeval diff = watchtime - time;
+ register TimerInfo *t = timerList->first();
+ while ( t ) { // repair all timers
+ t->timeout = t->timeout - diff;
+ t = timerList->next();
+ }
+}
+
+//
+// Timer activation functions (called from the event loop)
+//
+
+/*
+ Returns the time to wait for the next timer, or null if no timers are
+ waiting.
+
+ The result is bounded to qt_wait_timer_max if this exists.
+*/
+
+timeval *qt_wait_timer()
+{
+ static timeval tm;
+ bool first = TRUE;
+ timeval currentTime;
+ if ( timerList && timerList->count() ) { // there are waiting timers
+ getTime( currentTime );
+ if ( first ) {
+ if ( currentTime < watchtime ) // clock was turned back
+ repairTimer( currentTime );
+ first = FALSE;
+ watchtime = currentTime;
+ }
+ TimerInfo *t = timerList->first(); // first waiting timer
+ if ( currentTime < t->timeout ) { // time to wait
+ tm = t->timeout - currentTime;
+ } else {
+ tm.tv_sec = 0; // no time to wait
+ tm.tv_usec = 0;
+ }
+ if ( qt_wait_timer_max && *qt_wait_timer_max < tm )
+ tm = *qt_wait_timer_max;
+ return &tm;
+ }
+ if ( qt_wait_timer_max ) {
+ tm = *qt_wait_timer_max;
+ return &tm;
+ }
+ return 0; // no timers
+}
+
+// Timer initialization
+static void initTimers() // initialize timers
+{
+ timerBitVec = new TQBitArray( 128 );
+ Q_CHECK_PTR( timerBitVec );
+ int i = timerBitVec->size();
+ while( i-- > 0 )
+ timerBitVec->clearBit( i );
+ timerList = new TimerList;
+ Q_CHECK_PTR( timerList );
+ timerList->setAutoDelete( TRUE );
+ gettimeofday( &watchtime, 0 );
+}
+
+// Timer cleanup
+void cleanupTimers()
+{
+ delete timerList;
+ timerList = 0;
+ delete timerBitVec;
+ timerBitVec = 0;
+}
+
+// Main timer functions for starting and killing timers
+int qStartTimer( int interval, TQObject *obj )
+{
+ if ( !timerList ) // initialize timer data
+ initTimers();
+ int id = allocTimerId(); // get free timer id
+ if ( id <= 0 ||
+ id > (int)timerBitVec->size() || !obj )// cannot create timer
+ return 0;
+ timerBitVec->setBit( id-1 ); // set timer active
+ TimerInfo *t = new TimerInfo; // create timer
+ Q_CHECK_PTR( t );
+ t->id = id;
+ t->interval.tv_sec = interval/1000;
+ t->interval.tv_usec = (interval%1000)*1000;
+ timeval currentTime;
+ getTime( currentTime );
+ t->timeout = currentTime + t->interval;
+ t->obj = obj;
+ insertTimer( t ); // put timer in list
+ return id;
+}
+
+bool qKillTimer( int id )
+{
+ register TimerInfo *t;
+ if ( !timerList || id <= 0 ||
+ id > (int)timerBitVec->size() || !timerBitVec->testBit( id-1 ) )
+ return FALSE; // not init'd or invalid timer
+ t = timerList->first();
+ while ( t && t->id != id ) // find timer info in list
+ t = timerList->next();
+ if ( t ) { // id found
+ timerBitVec->clearBit( id-1 ); // set timer inactive
+ return timerList->remove();
+ }
+ else // id not found
+ return FALSE;
+}
+
+bool qKillTimer( TQObject *obj )
+{
+ register TimerInfo *t;
+ if ( !timerList ) // not initialized
+ return FALSE;
+ t = timerList->first();
+ while ( t ) { // check all timers
+ if ( t->obj == obj ) { // object found
+ timerBitVec->clearBit( t->id-1 );
+ timerList->remove();
+ t = timerList->current();
+ } else {
+ t = timerList->next();
+ }
+ }
+ return TRUE;
+}
+
+/*****************************************************************************
+ Socket notifier type
+ *****************************************************************************/
+TQSockNotType::TQSockNotType()
+ : list( 0 )
+{
+ FD_ZERO( &select_fds );
+ FD_ZERO( &enabled_fds );
+ FD_ZERO( &pending_fds );
+}
+
+TQSockNotType::~TQSockNotType()
+{
+ if ( list )
+ delete list;
+ list = 0;
+}
+
+/*****************************************************************************
+ TQEventLoop implementations for UNIX
+ *****************************************************************************/
+void TQEventLoop::registerSocketNotifier( TQSocketNotifier *notifier )
+{
+ int sockfd = notifier->socket();
+ int type = notifier->type();
+ if ( sockfd < 0 || sockfd >= FD_SETSIZE || type < 0 || type > 2 || notifier == 0 ) {
+#if defined(QT_CHECK_RANGE)
+ qWarning( "TQSocketNotifier: Internal error" );
+#endif
+ return;
+ }
+
+ TQPtrList<TQSockNot> *list = d->sn_vec[type].list;
+ fd_set *fds = &d->sn_vec[type].enabled_fds;
+ TQSockNot *sn;
+
+ if ( ! list ) {
+ // create new list, the TQSockNotType destructor will delete it for us
+ list = new TQPtrList<TQSockNot>;
+ Q_CHECK_PTR( list );
+ list->setAutoDelete( TRUE );
+ d->sn_vec[type].list = list;
+ }
+
+ sn = new TQSockNot;
+ 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
+ TQSockNot *p = list->first();
+ while ( p && p->fd > sockfd )
+ p = list->next();
+#if defined(QT_CHECK_STATE)
+ if ( p && p->fd == sockfd ) {
+ static const char *t[] = { "read", "write", "exception" };
+ qWarning( "TQSocketNotifier: Multiple socket notifiers for "
+ "same socket %d and type %s", sockfd, t[type] );
+ }
+#endif
+ if ( p )
+ list->insert( list->at(), sn );
+ else
+ list->append( sn );
+ }
+
+ FD_SET( sockfd, fds );
+ d->sn_highest = TQMAX( d->sn_highest, sockfd );
+}
+
+void TQEventLoop::unregisterSocketNotifier( TQSocketNotifier *notifier )
+{
+ int sockfd = notifier->socket();
+ int type = notifier->type();
+ if ( sockfd < 0 || type < 0 || type > 2 || notifier == 0 ) {
+#if defined(QT_CHECK_RANGE)
+ qWarning( "TQSocketNotifier: Internal error" );
+#endif
+ return;
+ }
+
+ TQPtrList<TQSockNot> *list = d->sn_vec[type].list;
+ fd_set *fds = &d->sn_vec[type].enabled_fds;
+ TQSockNot *sn;
+ if ( ! list )
+ return;
+ sn = list->first();
+ while ( sn && !(sn->obj == notifier && sn->fd == sockfd) )
+ sn = list->next();
+ if ( !sn ) // not found
+ return;
+
+ FD_CLR( sockfd, fds ); // clear fd bit
+ FD_CLR( sockfd, sn->queue );
+ d->sn_pending_list.removeRef( sn ); // remove from activation list
+ 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 = TQMAX( d->sn_highest, // list is fd-sorted
+ d->sn_vec[i].list->getFirst()->fd );
+ }
+ }
+}
+
+void TQEventLoop::setSocketNotifierPending( TQSocketNotifier *notifier )
+{
+ int sockfd = notifier->socket();
+ int type = notifier->type();
+ if ( sockfd < 0 || type < 0 || type > 2 || notifier == 0 ) {
+#if defined(QT_CHECK_RANGE)
+ qWarning( "TQSocketNotifier: Internal error" );
+#endif
+ return;
+ }
+
+ TQPtrList<TQSockNot> *list = d->sn_vec[type].list;
+ TQSockNot *sn;
+ if ( ! list )
+ return;
+ sn = list->first();
+ while ( sn && !(sn->obj == notifier && sn->fd == sockfd) )
+ sn = list->next();
+ if ( ! sn ) { // not found
+ 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.
+ 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 );
+ }
+}
+
+void TQEventLoop::wakeUp()
+{
+ /*
+ Apparently, there is not consistency among different operating
+ systems on how to use FIONREAD.
+
+ FreeBSD, Linux and Solaris all expect the 3rd argument to
+ ioctl() to be an int, which is normally 32-bit even on 64-bit
+ machines.
+
+ IRIX, on the other hand, expects a size_t, which is 64-bit on
+ 64-bit machines.
+
+ So, the solution is to use size_t initialized to zero to make
+ sure all bits are set to zero, preventing underflow with the
+ FreeBSD/Linux/Solaris ioctls.
+ */
+ size_t nbytes = 0;
+ char c = 0;
+ if ( ::ioctl( d->thread_pipe[0], FIONREAD, (char*)&nbytes ) >= 0 && nbytes == 0 ) {
+ ::write( d->thread_pipe[1], &c, 1 );
+ }
+}
+
+int TQEventLoop::timeToWait() const
+{
+ timeval *tm = qt_wait_timer();
+ if ( ! tm ) // no active timers
+ return -1;
+ return (tm->tv_sec*1000) + (tm->tv_usec/1000);
+}
+
+int TQEventLoop::activateTimers()
+{
+ if ( !timerList || !timerList->count() ) // no timers
+ return 0;
+ bool first = TRUE;
+ timeval currentTime;
+ int n_act = 0, maxCount = timerList->count();
+ TimerInfo *begin = 0;
+ register TimerInfo *t;
+
+ for ( ;; ) {
+ if ( ! maxCount-- )
+ break;
+ getTime( currentTime ); // get current time
+ if ( first ) {
+ if ( currentTime < watchtime ) // clock was turned back
+ repairTimer( currentTime );
+ first = FALSE;
+ watchtime = currentTime;
+ }
+ t = timerList->first();
+ if ( !t || currentTime < t->timeout ) // no timer has expired
+ break;
+ if ( ! begin ) {
+ begin = t;
+ } else if ( begin == t ) {
+ // avoid sending the same timer multiple times
+ break;
+ } else if ( t->interval < begin->interval || t->interval == begin->interval ) {
+ begin = t;
+ }
+ timerList->take(); // unlink from list
+ t->timeout += t->interval;
+ if ( t->timeout < currentTime )
+ t->timeout = currentTime + t->interval;
+ insertTimer( t ); // relink timer
+ if ( t->interval.tv_usec > 0 || t->interval.tv_sec > 0 )
+ n_act++;
+ TQTimerEvent e( t->id );
+ TQApplication::sendEvent( t->obj, &e ); // send event
+ if ( timerList->findRef( begin ) == -1 )
+ begin = 0;
+ }
+ return n_act;
+}
+
+int TQEventLoop::activateSocketNotifiers()
+{
+ if ( d->sn_pending_list.isEmpty() )
+ return 0;
+
+ // activate entries
+ int n_act = 0;
+ TQEvent event( TQEvent::SockAct );
+ TQPtrListIterator<TQSockNot> it( d->sn_pending_list );
+ TQSockNot *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 );
+ TQApplication::sendEvent( sn->obj, &event );
+ n_act++;
+ }
+ }
+
+ return n_act;
+}
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