int QEventLoop::timeToWait() const
{
timeval *tm = qt_wait_timer();
if ( ! tm ) // no active timers
return -1;
return (tm->tv_sec*1000) + (tm->tv_usec/1000);
}
static void np_do_timers( void*, void* )
{
qt_np_timerid = 0; // It's us, and we just expired, that's why we are here.
qt_activate_timers();
timeval *tm = qt_wait_timer();
if (tm) {
int interval = QMIN(tm->tv_sec,INT_MAX/1000)*1000 + tm->tv_usec/1000;
np_set_timer( interval );
}
qxtapp->sendPostedEvents();
}
bool QEventLoop::processEvents( ProcessEventsFlags flags )
{
// process events from the X server
XEvent event;
int nevents = 0;
#if defined(QT_THREAD_SUPPORT)
QMutexLocker locker( QApplication::qt_mutex );
#endif
// handle gui and posted events
if ( qt_is_gui_used ) {
QApplication::sendPostedEvents();
// Two loops so that posted events accumulate
while ( XPending( QPaintDevice::x11AppDisplay() ) ) {
// also flushes output buffer
while ( XPending( QPaintDevice::x11AppDisplay() ) ) {
if ( d->shortcut ) {
return FALSE;
}
XNextEvent( QPaintDevice::x11AppDisplay(), &event );
if ( flags & ExcludeUserInput ) {
switch ( event.type ) {
case ButtonPress:
case ButtonRelease:
case MotionNotify:
case XKeyPress:
case XKeyRelease:
case EnterNotify:
case LeaveNotify:
continue;
case ClientMessage:
{
// from qapplication_x11.cpp
extern Atom qt_wm_protocols;
extern Atom qt_wm_take_focus;
extern Atom qt_qt_scrolldone;
// only keep the wm_take_focus and
// qt_qt_scrolldone protocols, discard all
// other client messages
if ( event.xclient.format != 32 )
continue;
if ( event.xclient.message_type == qt_wm_protocols ||
(Atom) event.xclient.data.l[0] == qt_wm_take_focus )
break;
if ( event.xclient.message_type == qt_qt_scrolldone )
break;
}
default: break;
}
}
nevents++;
if ( qApp->x11ProcessEvent( &event ) == 1 )
return TRUE;
}
}
}
if ( d->shortcut ) {
return FALSE;
}
QApplication::sendPostedEvents();
const uint exclude_all = ExcludeSocketNotifiers | 0x08;
// 0x08 == ExcludeTimers for X11 only
if ( nevents > 0 && ( flags & exclude_all ) == exclude_all &&
( flags & WaitForMore ) ) {
return TRUE;
}
// don't block if exitLoop() or exit()/quit() has been called.
bool canWait = d->exitloop || d->quitnow ? FALSE : (flags & WaitForMore);
// Process timers and socket notifiers - the common UNIX stuff
// return the maximum time we can wait for an event.
static timeval zerotm;
timeval *tm = 0;
if ( ! ( flags & 0x08 ) ) { // 0x08 == ExcludeTimers for X11 only
tm = qt_wait_timer(); // wait for timer or X event
if ( !canWait ) {
if ( !tm )
tm = &zerotm;
tm->tv_sec = 0; // no time to wait
tm->tv_usec = 0;
}
}
int highest = 0;
if ( ! ( flags & ExcludeSocketNotifiers ) ) {
// 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 );
}
highest = d->sn_highest;
} 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 );
}
if ( qt_is_gui_used ) {
// select for events on the event socket - only on X11
FD_SET( d->xfd, &d->sn_vec[0].select_fds );
highest = QMAX( highest, d->xfd );
}
FD_SET( d->thread_pipe[0], &d->sn_vec[0].select_fds );
highest = QMAX( highest, d->thread_pipe[0] );
if ( canWait )
emit aboutToBlock();
if ( qt_preselect_handler ) {
QVFuncList::Iterator it, end = qt_preselect_handler->end();
for ( it = qt_preselect_handler->begin(); it != end; ++it )
(**it)();
}
// unlock the GUI mutex and select. when we return from this function, there is
// something for us to do
#if defined(QT_THREAD_SUPPORT)
locker.mutex()->unlock();
#endif
int nsel;
do {
nsel = select( highest + 1,
&d->sn_vec[0].select_fds,
&d->sn_vec[1].select_fds,
&d->sn_vec[2].select_fds,
tm );
} while (nsel == -1 && (errno == EINTR || errno == EAGAIN));
// relock the GUI mutex before processing any pending events
#if defined(QT_THREAD_SUPPORT)
locker.mutex()->lock();
#endif
// we are awake, broadcast it
emit awake();
emit qApp->guiThreadAwake();
if (nsel == -1) {
if (errno == EBADF) {
// it seems a socket notifier has a bad fd... find out
// which one it is and disable it
fd_set fdset;
zerotm.tv_sec = zerotm.tv_usec = 0l;
for (int type = 0; type < 3; ++type) {
QPtrList<QSockNot> *list = d->sn_vec[type].list;
if (!list) continue;
QSockNot *sn = list->first();
while (sn) {
FD_ZERO(&fdset);
FD_SET(sn->fd, &fdset);
int ret = -1;
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 == -1 && (errno == EINTR || errno == EAGAIN));
if (ret == -1 && errno == EBADF) {
// 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();
}
}
} else {
// EINVAL... shouldn't happen, so let's complain to stderr
// and hope someone sends us a bug report
perror( "select" );
}
}
// some other thread woke us up... consume the data on the thread pipe so that
// select doesn't immediately return next time
if ( nsel > 0 && FD_ISSET( d->thread_pipe[0], &d->sn_vec[0].select_fds ) ) {
char c;
::read( d->thread_pipe[0], &c, 1 );
}
if ( qt_postselect_handler ) {
QVFuncList::Iterator it, end = qt_postselect_handler->end();
for ( it = qt_postselect_handler->begin(); it != end; ++it )
(**it)();
}
// activate socket notifiers
if ( ! ( flags & ExcludeSocketNotifiers ) && nsel > 0 && d->sn_highest >= 0 ) {
// 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<QSockNot> *list = d->sn_vec[i].list;
QSockNot *sn = list->first();
while ( sn ) {
if ( FD_ISSET( sn->fd, &d->sn_vec[i].select_fds ) )
setSocketNotifierPending( sn->obj );
sn = list->next();
}
}
nevents += activateSocketNotifiers();
}
// activate timers
if ( ! ( flags & 0x08 ) ) {
// 0x08 == ExcludeTimers for X11 only
nevents += activateTimers();
}
// color approx. optimization - only on X11
qt_reset_color_avail();
// return true if we handled events, false otherwise
return (nevents > 0);
}
