bool ScheduledActions::execute() {
if (node) {
node->cancel();
}
timeScheduled = clock->getCurrentTimeUS();
scheduledDelay = MWTime(*delay);
scheduledInterval = MWTime(*interval);
nRepeated = 0;
boost::weak_ptr<ScheduledActions> weakThis(component_shared_from_this<ScheduledActions>());
node = Scheduler::instance()->scheduleUS(FILELINE,
scheduledDelay,
scheduledInterval,
int(*n_repeats),
[weakThis]() {
if (auto sharedThis = weakThis.lock()) {
sharedThis->executeOnce();
}
return nullptr;
},
M_DEFAULT_PRIORITY,
M_DEFAULT_WARN_SLOP_US,
M_DEFAULT_FAIL_SLOP_US,
M_MISSED_EXECUTION_CATCH_UP);
return true;
}
CVReturn StimulusDisplay::displayLinkCallback(CVDisplayLinkRef _displayLink,
const CVTimeStamp *now,
const CVTimeStamp *outputTime,
CVOptionFlags flagsIn,
CVOptionFlags *flagsOut,
void *_display)
{
StimulusDisplay *display = static_cast<StimulusDisplay*>(_display);
{
unique_lock lock(display->display_lock);
if (bool(warnOnSkippedRefresh->getValue())) {
if (display->lastFrameTime) {
int64_t delta = (outputTime->videoTime - display->lastFrameTime) - outputTime->videoRefreshPeriod;
if (delta) {
mwarning(M_DISPLAY_MESSAGE_DOMAIN,
"Skipped %g display refresh cycles",
(double)delta / (double)(outputTime->videoRefreshPeriod));
}
}
}
display->lastFrameTime = outputTime->videoTime;
//
// Here's how the time calculation works:
//
// outputTime->hostTime is the (estimated) time that the frame we're currently drawing will be displayed.
// The value is in units of the "host time base", which appears to mean that it's directly comparable to
// the value returned by mach_absolute_time(). However, the relationship to mach_absolute_time() is not
// explicitly stated in the docs, so presumably we can't depend on it.
//
// What the CoreVideo docs *do* say is "the host time base for Core Video and the one for CoreAudio are
// identical, and the values returned from either API can be used interchangeably". Hence, we can use the
// CoreAudio function AudioConvertHostTimeToNanos() to convert from the host time base to nanoseconds.
//
// Once we have a system time in nanoseconds, we substract the system base time and convert to
// microseconds, which leaves us with a value that can be compared to clock->getCurrentTimeUS().
//
display->currentOutputTimeUS = (MWTime(AudioConvertHostTimeToNanos(outputTime->hostTime)) -
display->clock->getSystemBaseTimeNS()) / 1000LL;
display->refreshDisplay();
display->waitingForRefresh = false;
}
// Signal waiting threads that refresh is complete
display->refreshCond.notify_all();
return kCVReturnSuccess;
}
NIDAQDevice::NIDAQDevice(const ParameterValueMap ¶meters) :
IODevice(parameters),
deviceName(parameters[NAME].str()),
requestSemName(generateUniqueID()),
responseSemName(generateUniqueID()),
controlChannel(boost::interprocess::create_only, requestSemName, responseSemName),
sharedMemoryName(generateUniqueID()),
sharedMemory(boost::interprocess::create_only, sharedMemoryName),
controlMessage(NULL),
helperPID(-1),
updateInterval(parameters[UPDATE_INTERVAL]),
analogInputDataInterval(parameters[ANALOG_INPUT_DATA_INTERVAL]),
analogReadTimeout(updateInterval),
assumeMultiplexedADC(parameters[ASSUME_MULTIPLEXED_ADC]),
analogInputSampleBufferSize(0),
analogInputTaskRunning(false),
analogOutputDataInterval(parameters[ANALOG_OUTPUT_DATA_INTERVAL]),
analogOutputSampleBufferSize(0),
analogOutputEnabled(parameters[ANALOG_OUTPUT_ENABLED]),
analogOutputTaskRunning(false),
digitalInputSampleBufferSize(0),
digitalInputTaskRunning(false),
digitalOutputSampleBufferSize(0),
digitalOutputTasksRunning(false),
counterInputCountEdgesTasksRunning(false)
{
if (updateInterval <= 0) {
throw SimpleException(M_IODEVICE_MESSAGE_DOMAIN, "Invalid update interval");
}
if (analogInputDataInterval <= 0) {
throw SimpleException(M_IODEVICE_MESSAGE_DOMAIN, "Invalid analog input data interval");
}
if (updateInterval % analogInputDataInterval != 0) {
throw SimpleException(M_IODEVICE_MESSAGE_DOMAIN,
"Update interval must be an integer multiple of analog input data interval");
}
if (!(parameters[ANALOG_READ_TIMEOUT].empty())) {
analogReadTimeout = MWTime(parameters[ANALOG_READ_TIMEOUT]);
if (analogReadTimeout < 0) {
throw SimpleException(M_IODEVICE_MESSAGE_DOMAIN, "Invalid analog read timeout");
}
}
if (analogOutputDataInterval <= 0) {
throw SimpleException(M_IODEVICE_MESSAGE_DOMAIN, "Invalid analog output data interval");
}
}
MovingDots::MovingDots(const ParameterValueMap ¶meters) :
StandardDynamicStimulus(parameters),
fieldRadius(registerVariable(parameters[FIELD_RADIUS])),
fieldCenterX(registerVariable(parameters[FIELD_CENTER_X])),
fieldCenterY(registerVariable(parameters[FIELD_CENTER_Y])),
dotDensity(registerVariable(parameters[DOT_DENSITY])),
dotSize(registerVariable(parameters[DOT_SIZE])),
alpha(registerVariable(parameters[ALPHA_MULTIPLIER])),
direction(registerVariable(parameters[DIRECTION])),
speed(registerVariable(parameters[SPEED])),
coherence(registerVariable(parameters[COHERENCE])),
lifetime(registerVariable(parameters[LIFETIME])),
announceDots(parameters[ANNOUNCE_DOTS]),
previousFieldRadius(1.0f),
currentFieldRadius(1.0f),
previousNumDots(0),
currentNumDots(0),
previousSpeed(0.0f),
currentSpeed(0.0f),
previousCoherence(1.0f),
currentCoherence(1.0f),
previousLifetime(0.0f),
currentLifetime(0.0f),
dotSizeToPixels(0.0f),
previousTime(-1),
currentTime(-1)
{
ParsedColorTrio color(parameters[COLOR]);
red = registerVariable(color.getR());
green = registerVariable(color.getG());
blue = registerVariable(color.getB());
if (parameters[RAND_SEED].empty()) {
randSeed = Clock::instance()->getSystemTimeNS();
} else {
randSeed = MWTime(parameters[RAND_SEED]);
}
randGen.seed(randSeed);
}
void HighPrecisionClock::sleepNS(MWTime time) {
wait(mach_absolute_time() + timebase.nanosToAbsolute(std::max(MWTime(0), time)));
}