/*
* This method is used to inject a custom BPS event into the BPS event handler using
* the channel and domain that we saved during the initialisation process.
*/
void NfcWorker::interruptBpsWaitLoop(unsigned int code) {
int rc = 0;
if (!_timeToDie) {
qDebug() << "XXXX Trying to interrupt...";
_interruptMutex.lock();
bps_event_t *interruptEvent;
rc = 0;
qDebug() << "XXXX Time(ms) : " << getSysTimeMs() << ": bps_event_create() - entering";
rc = bps_event_create(&interruptEvent, _bpsInterruptDomain, code, 0, 0);
qDebug() << "XXXX Time(ms) : " << getSysTimeMs() << ": bps_event_create() - exited";
if (rc) {
qDebug() << "XXXX Unable to create a BPS custom event";
} else {
qDebug() << "XXXX Created a BPS custom event";
}
rc = 0;
qDebug() << "XXXX Time(ms) : " << getSysTimeMs() << ": bps_channel_push_event() - entering";
rc = bps_channel_push_event(_bpsChannel, interruptEvent);
qDebug() << "XXXX Time(ms) : " << getSysTimeMs() << ": bps_channel_push_event() - exited";
if (rc) {
qDebug() << "XXXX Unable to push custom event onto BPS channel";
} else {
qDebug() << "XXXX Pushed custom event onto BPS channel";
}
_interruptMutex.unlock();
} else {
qDebug() << "XXXX No need to interrupt NfcWorker since already closing down";
}
}
void BBMBPS::StartContactEvents()
{
if (!contactEventsEnabled) {
bps_event_t *event = NULL;
bps_event_create(&event, m_BBMInternalDomain, INTERNAL_EVENT_CONTACT_EVENTS, NULL, NULL);
bps_channel_push_event(m_eventChannel, event);
}
}
void BBMBPS::Register(const std::string& uuid)
{
bps_event_t *event = NULL;
bps_event_payload_t payload;
char *stringBuf = new char[uuid.size()];
payload.data1 = reinterpret_cast<uintptr_t>(stringBuf);
bps_event_create(&event, m_BBMInternalDomain, INTERNAL_EVENT_REGISTER, &payload, NULL);
bps_channel_push_event(m_eventChannel, event);
}
void QEventDispatcherBlackberry::wakeUp()
{
Q_D(QEventDispatcherBlackberry);
if (d->wakeUps.testAndSetAcquire(0, 1)) {
bps_event_t *event;
if (Q_LIKELY(bps_event_create(&event, bpsUnblockDomain, 0, 0, 0) == BPS_SUCCESS)) {
if (Q_LIKELY(bps_channel_push_event(d->bps_channel, event) == BPS_SUCCESS))
return;
else
bps_event_destroy(event);
}
qWarning("QEventDispatcherBlackberry: wakeUp failed");
}
}
static void
status_callback(camera_handle_t handle,
camera_devstatus_t status,
uint16_t extra,
void* arg)
{
fprintf(stderr, "status notification: %d, %d\n", status, extra);
// when all photo-taking callbacks have completed, the capture-complete event is emitted
if (status == CAMERA_STATUS_CAPTURECOMPLETE) {
// picture-taking is done, so wake up the main thread again via bps.
// note that we are using the void* arg here as the bps channel to deliver
// the event on. this is just to demonstrate data passing between
// camera_take_photo() and the various callback functions.
bps_event_t* photo_done_event;
bps_event_create(&photo_done_event, photo_done_domain, 0, NULL, NULL);
bps_channel_push_event((int)arg, photo_done_event);
}
}
/**
* The main entry point.
*/
int
main(int argc, char *argv[])
{
pthread_t accel_thread;
bool exit_application = false;
int rc;
/*
* Before we can listen for events from the BlackBerry Tablet OS platform
* services, we need to initialize the BPS infrastructure
*/
bps_initialize();
/*
* Initialize the screen so that the window group Id is properly set,
* to allow the dialogs to be displayed.
*/
if (setup_screen() != EXIT_SUCCESS) {
fprintf(stderr, "Unable to initialize screen.");
exit(-1);
}
/*
* Once the BPS infrastructure has been initialized we can register for
* events from the various BlackBerry Tablet OS platform services. The
* Navigator service manages and delivers application life cycle and
* visibility events.
*
* We register a custom event domain so that we can communicate with the
* the accelerometer thread. We will need to tell it to quit once we get
* the NAVIGATOR_EXIT.
*
* We request Navigator events so that we can track when the system is
* terminating the application (NAVIGATOR_EXIT event).
*
*/
local_event_domain = bps_register_domain();
if (local_event_domain == -1) {
fprintf(stderr, "Error registering custom event domain: %s", strerror(errno));
exit(-1);
}
if (BPS_SUCCESS != navigator_request_events(0)) {
fprintf(stderr, "Error requesting navigator events: %s", strerror(errno));
exit(-1);
}
if (BPS_SUCCESS != dialog_request_events(0)) {
fprintf(stderr, "Error requesting dialog events: %s", strerror(errno));
exit(-1);
}
if (BPS_SUCCESS != geolocation_request_events(0)) {
fprintf(stderr, "Error requesting geolocation events: %s", strerror(errno));
exit(-1);
}
geolocation_set_period(1);
/*
* Create and display the dialogs that will show the data.
*/
create_top_dialog();
show_top_dialog_message("Geolocation getting first fix");
/*
* Before initializing the accelerometer service we must ensure the device
* supports it.
*/
if (!sensor_is_supported(SENSOR_TYPE_ACCELEROMETER)) {
/**
* If the device does not support accelerometer then notify the user,
* clean up and exit
*/
snprintf(msg, MSG_SIZE, "Accelerometer not supported by device!");
show_top_dialog_message(msg);
/*
* Destroy the dialog, if it exists and cleanup screen resources.
*/
destroy_top_dialog();
cleanup_screen();
bps_shutdown();
return EXIT_FAILURE;
}
/*
* Create the accelerometer event thread.
*/
rc = pthread_create(&accel_thread, NULL, accel_main, NULL);
if (rc != 0) {
fprintf(stderr, "Error in pthread_create: %s", strerror(errno));
exit(-1);
}
while (!exit_application) {
/*
* Using a negative timeout (-1) in the call to bps_get_event(...)
* ensures that we don't busy wait by blocking until an event is
* available.
*/
bps_event_t *event = NULL;
bps_get_event(&event, -1);
if (event) {
if (bps_event_get_domain(event) == geolocation_get_domain()) {
handle_geolocation_response(event);
}
else if (bps_event_get_domain(event) == navigator_get_domain()) {
exit_application = handle_navigator_event(event);
}
}
}
geolocation_stop_events(0);
/*
* Avoid a possible race condition where accel_chid has not yet
* been assigned a valid channel ID.
*/
pthread_mutex_lock(&chidMutex);
while (accel_chid == -1) {
pthread_cond_wait(&chidCond, &chidMutex);
}
pthread_mutex_unlock(&chidMutex);
bps_event_t *stop_request_event = NULL;
if (BPS_SUCCESS != bps_event_create(&stop_request_event, local_event_domain, STOP_REQUEST, NULL, NULL)) {
fprintf(stderr, "Unable to create event: %s", strerror(errno));
exit(-1);
}
if (BPS_SUCCESS != bps_channel_push_event(accel_chid, stop_request_event)) {
fprintf(stderr, "Unable to push event: %s", strerror(errno));
}
pthread_join(accel_thread, NULL);
/*
* Destroy the dialog, if it exists.
*/
destroy_top_dialog();
bps_shutdown();
cleanup_screen();
return 0;
}
int QEventDispatcherBlackberry::select(int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds,
timespec *timeout)
{
Q_UNUSED(nfds);
Q_D(QEventDispatcherBlackberry);
const BBScopedLoopLevelCounter bbLoopCounter(d);
BpsChannelScopeSwitcher channelSwitcher(d->bps_channel);
// prepare file sets for bps callback
d->ioData->count = 0;
d->ioData->readfds = readfds;
d->ioData->writefds = writefds;
d->ioData->exceptfds = exceptfds;
// reset all file sets
if (readfds)
FD_ZERO(readfds);
if (writefds)
FD_ZERO(writefds);
if (exceptfds)
FD_ZERO(exceptfds);
bps_event_t *event = 0;
unsigned int eventCount = 0;
// If an event handler called through filterEvent() starts a nested event loop by creating a
// new QEventLoop, we will recursively enter this function again. However, each time
// bps_get_event() is called, it destroys the last event it handed out before returning the
// next event. We don't want it to destroy the event that triggered the nested event loop,
// since there may still be more handlers that need to get that event, once the nested event
// loop is done and control returns to the outer event loop.
//
// So we move an event to a holding channel, which takes ownership of the event. Putting
// the event on our own channel allows us to manage when it is destroyed, keeping it alive
// until we know we are done with it. Each recursive call of this function needs to have
// it's own holding channel, since a channel is a queue, not a stack.
//
// However, a recursive call into this function happens very rarely compared to the many
// times this function is called. We don't want to create a holding channel for each time
// this function is called, only when it is called recursively. Thus we have the instance
// variable d->holding_channel to use in the common case. We keep track of recursive calls
// with d->loop_level. If we are in a recursive call, then we create a new holding channel
// for this run.
int holding_channel = d->holding_channel;
if ((d->loop_level > 1) &&
Q_UNLIKELY(bps_channel_create(&holding_channel, 0) != BPS_SUCCESS)) {
qWarning("QEventDispatcherBlackberry: bps_channel_create failed");
holding_channel = -1;
}
// Convert timeout to milliseconds
int timeoutTotal = -1;
if (timeout)
timeoutTotal = timespecToMillisecs(*timeout);
int timeoutLeft = timeoutTotal;
timespec startTime = qt_gettime();
// This loop exists such that we can drain the bps event queue of all native events
// more efficiently than if we were to return control to Qt after each event. This
// is important for handling touch events which can come in rapidly.
forever {
// Only emit the awake() and aboutToBlock() signals in the second iteration. For the
// first iteration, the UNIX event dispatcher will have taken care of that already.
// Also native events are actually processed one loop iteration after they were
// retrieved with bps_get_event().
// Filtering the native event should happen between the awake() and aboutToBlock()
// signal emissions. The calls awake() - filterNativeEvent() - aboutToBlock() -
// bps_get_event() need not to be interrupted by a break or return statement.
if (eventCount > 0) {
if (event) {
emit awake();
filterNativeEvent(QByteArrayLiteral("bps_event_t"), static_cast<void*>(event), 0);
emit aboutToBlock();
if (Q_LIKELY(holding_channel != -1)) {
// We are now done with this BPS event. Destroy it.
destroyHeldBpsEvent(holding_channel);
}
}
// Update the timeout
// Clock source is monotonic, so we can recalculate how much timeout is left
if (timeoutTotal != -1) {
timespec t2 = qt_gettime();
timeoutLeft = timeoutTotal
- (timespecToMillisecs(t2) - timespecToMillisecs(startTime));
if (timeoutLeft < 0)
timeoutLeft = 0;
}
timespec tnext;
if (d->timerList.timerWait(tnext)) {
int timeoutNext = timespecToMillisecs(tnext);
if (timeoutNext < timeoutLeft || timeoutTotal == -1) {
timeoutTotal = timeoutLeft = timeoutNext;
startTime = qt_gettime();
}
}
}
event = 0;
{ // We need to increase loop level in this scope,
// because bps_get_event can also invoke callbacks
QScopedLoopLevelCounter loopLevelCounter(d->threadData);
// Wait for event or file to be ready
const int result = bps_get_event(&event, timeoutLeft);
if (Q_UNLIKELY(result != BPS_SUCCESS))
qWarning("QEventDispatcherBlackberry: bps_get_event failed");
}
if (!event) // In case of !event, we break out of the loop to let Qt process the timers
break; // (since timeout has expired) and socket notifiers that are now ready.
if (bps_event_get_domain(event) == bpsUnblockDomain) {
timeoutTotal = 0; // in order to immediately drain the event queue of native events
event = 0; // (especially touch move events) we don't break out here
} else {
// Move the event to our holding channel so we can manage when it is destroyed.
if (Q_LIKELY(holding_channel != 1) &&
Q_UNLIKELY(bps_channel_push_event(holding_channel, event) != BPS_SUCCESS)) {
qWarning("QEventDispatcherBlackberry: bps_channel_push_event failed");
}
}
++eventCount;
// Make sure we are not trapped in this loop due to continuous native events
// also we cannot recalculate the timeout without a monotonic clock as the time may have changed
const unsigned int maximumEventCount = 12;
if (Q_UNLIKELY((eventCount > maximumEventCount && timeoutLeft == 0)
|| !QElapsedTimer::isMonotonic())) {
if (event) {
filterNativeEvent(QByteArrayLiteral("bps_event_t"), static_cast<void*>(event), 0);
if (Q_LIKELY(holding_channel != -1)) {
// We are now done with this BPS event. Destroy it.
destroyHeldBpsEvent(holding_channel);
}
}
break;
}
}
// If this was a recursive call into this function, a new holding channel was created for
// this run, so destroy it now.
if ((holding_channel != d->holding_channel) &&
Q_LIKELY(holding_channel != -1) &&
Q_UNLIKELY(bps_channel_destroy(holding_channel) != BPS_SUCCESS)) {
qWarning("QEventDispatcherBlackberry: bps_channel_destroy failed");
}
// the number of bits set in the file sets
return d->ioData->count;
}
void BBMBPS::SendEndEvent()
{
bps_event_t *event = NULL;
bps_event_create(&event, m_BBMInternalDomain, INTERNAL_EVENT_STOP, NULL, NULL);
bps_channel_push_event(m_eventChannel, event);
}
