bool BProcess::ScheduleNextEvent()
{
// bout << "BProcess::ScheduleNextEvent (" << SysCurrentThread() << ")@" << SysGetRunTime() << endl;
// Don't schedule the next event if it would introduce too much concurrency.
// XXX TO DO -- need to allow scheduling the next event if all currently
// running handlers are blocked.
if (m_currentEventConcurrency >= m_maxEventConcurrency) {
return false;
}
int32_t priority = B_NORMAL_PRIORITY;
const nsecs_t nextTime = m_pendingHandlers
? m_pendingHandlers->NextMessageTime(&priority)
: B_INFINITE_TIMEOUT;
if (nextTime < m_nextEventTime) {
#if 0
bout << "Setting next event time: from " << m_nextEventTime << " to " << nextTime
<< " (" << (nextTime-SysGetRunTime()) << " from now)" << endl;
#endif
m_nextEventTime = nextTime;
return SLooper::_SetNextEventTime(m_nextEventTime, sysThreadPriorityBestUser);
}
return false;
}
void fastPoll( void )
{
RANDOM_STATE randomState;
BYTE buffer[ RANDOM_BUFSIZE + 8 ];
WinHandle winHandle;
Coord xCoord, yCoord;
Boolean flag;
uint64_t ticks;
nsecs_t nsTime;
initRandomData( randomState, buffer, RANDOM_BUFSIZE );
/* Get the event-available and low-level event-available flag, current
pen status, and handle of the window with the input focus */
flag = EvtEventAvail();
addRandomValue( randomState, flag );
flag = EvtSysEventAvail( TRUE );
addRandomValue( randomState, flag );
EvtGetPen( &xCoord, &yCoord, &flag );
addRandomValue( randomState, xCoord );
addRandomValue( randomState, yCoord );
winHandle = EvtGetFocusWindow();
addRandomValue( randomState, winHandle );
/* Get the number of ticks of the (software) millisecond clock used
by the scheduler, and the length of time in nanoseconds since the
last reset */
ticks = TimGetTicks();
addRandomData( randomState, &ticks, sizeof( uint64_t ) );
nsTime = SysGetRunTime();
addRandomData( randomState, &nsTime, sizeof( nsecs_t ) );
/* Get the value of the real-time and runtime clocks in nanoseconds.
One of these may just be a wrapper for SysGetRunTime(), in addition
it's likely that they're hardware-specific, being CPU-level cycle
counters of some kind */
nsTime = system_real_time();
addRandomData( randomState, &nsTime, sizeof( nsecs_t ) );
nsTime = system_time();
addRandomData( randomState, &nsTime, sizeof( nsecs_t ) );
/* Flush any remaining data through */
endRandomData( randomState, 5 );
}
