bool BProcess::InsertHandler(BHandler **handlerP, BHandler *handler)
{
BHandler *p = *handlerP;
if (!p) {
*handlerP = handler;
handler->m_next = handler->m_prev = NULL;
return true;
}
const nsecs_t msgTime = handler->NextMessageTime(NULL);
if (p->NextMessageTime(NULL) > msgTime) {
(*handlerP)->m_prev = handler;
*handlerP = handler;
handler->m_next = p;
handler->m_prev = NULL;
} else {
while (p->m_next && (p->m_next->NextMessageTime(NULL) < msgTime)) p = p->m_next;
handler->m_next = p->m_next;
handler->m_prev = p;
if (p->m_next) p->m_next->m_prev = handler;
p->m_next = handler;
}
return false;
}
BLooper::~BLooper()
{
if (fRunCalled && !fTerminating) {
debugger("You can't call delete on a BLooper object "
"once it is running.");
}
Lock();
// In case the looper thread calls Quit() fLastMessage is not deleted.
if (fLastMessage) {
delete fLastMessage;
fLastMessage = NULL;
}
// Close the message port and read and reply to the remaining messages.
if (fMsgPort >= 0 && fOwnsPort)
close_port(fMsgPort);
// Clear the queue so our call to IsMessageWaiting() below doesn't give
// us bogus info
fDirectTarget->Close();
BMessage* message;
while ((message = fDirectTarget->Queue()->NextMessage()) != NULL) {
delete message;
// msg will automagically post generic reply
}
if (!fOwnsPort) {
do {
delete ReadMessageFromPort(0);
// msg will automagically post generic reply
} while (IsMessageWaiting());
delete_port(fMsgPort);
}
fDirectTarget->Release();
// Clean up our filters
SetCommonFilterList(NULL);
AutoLocker<BLooperList> ListLock(gLooperList);
RemoveHandler(this);
// Remove all the "child" handlers
int32 count = fHandlers.CountItems();
for (int32 i = 0; i < count; i++) {
BHandler* handler = (BHandler*)fHandlers.ItemAtFast(i);
handler->SetNextHandler(NULL);
handler->SetLooper(NULL);
}
fHandlers.MakeEmpty();
Unlock();
gLooperList.RemoveLooper(this);
delete_sem(fLockSem);
}
/**
RemoveHandler(BHandler* handler)
@case Valid looper and handler; handler has filters
@param handler Valid BHandler pointer
@results RemoveHandler() returns true
handler->FilterList() returns NULL after removal
*/
void TRemoveHandlerTest::RemoveHandler5()
{
BLooper Looper;
BHandler Handler;
BMessageFilter* MessageFilter = new BMessageFilter('1234');
Handler.AddFilter(MessageFilter);
Looper.AddHandler(&Handler);
CPPUNIT_ASSERT(Looper.RemoveHandler(&Handler));
CPPUNIT_ASSERT(Handler.FilterList());
}
/* We overwrite SetValue to send a message to the target everytime
the setting change and not only at the end. */
void CControl::SetValue(int32 color_value)
{
BHandler *handler;
BColorControl::SetValue(color_value);
handler = Target();
if (handler) {
BMessage msg;
msg.AddInt32("be:value", color_value);
handler->Looper()->PostMessage(&msg, handler);
}
}
void TorrentObject::TorrentMetadataCallback(tr_torrent* torrent, void* data)
{
TorrentObject* torrentObject = reinterpret_cast<TorrentObject*>(data);
BHandler* handler = torrentObject->fMetadataHandler;
//
//
//
if( handler == NULL )
return;
//
// Build the message.
//
if (BLooper* looper = handler->Looper())
looper->PostMessage(new BMessage(MSG_TRANSMISSION_METADATA_CALLBACK), handler);
}
void ArpNotificationType::NotifyDependents(BMessage *msg, bool deliverAsynchronously)
{
BHandler *h;
BLooper *looper;
for (long i=0; (h = (BHandler*)dependents.ItemAt(i)) != 0; i++) {
if (((looper = h->Looper()) != 0)
&& (looper->Lock())) {
// FIX: need to send out the message, and let the views
// invalidate themselves! So be aware that the Update
// implementation will ALWAYS be called from within this
// loop, meaning within a lock/unlock
#if 0 // Uncomment this to debug where messages are going
printf("SENDING MESSAGE TO %s\n", h->Name()); fflush(stdout);
#endif
h->MessageReceived(msg);
looper->Unlock();
}
}
}
filter_result
SpinnerMsgFilter::Filter(BMessage *msg, BHandler **target)
{
int32 c;
msg->FindInt32("raw_char",&c);
switch (c) {
case B_ENTER: {
BTextView *text = dynamic_cast<BTextView*>(*target);
if (text && text->IsFocus()) {
BView *view = text->Parent();
while (view) {
Spinner *spin = dynamic_cast<Spinner*>(view);
if (spin) {
BString string(text->Text());
int32 newvalue = 0;
sscanf(string.String(),"%ld",&newvalue);
if (newvalue != spin->Value()) {
spin->SetValue(newvalue);
spin->Invoke();
}
return B_SKIP_MESSAGE;
}
view = view->Parent();
}
}
return B_DISPATCH_MESSAGE;
}
case B_TAB: {
// Cause Tab characters to perform keybaord navigation
BHandler *h = *target;
BView *v = NULL;
h = h->NextHandler();
while (h) {
v = dynamic_cast<BView*>(h);
if (v) {
*target = v->Window();
return B_DISPATCH_MESSAGE;
}
h = h->NextHandler();
}
return B_SKIP_MESSAGE;
}
case B_UP_ARROW:
case B_DOWN_ARROW: {
BTextView *text = dynamic_cast<BTextView*>(*target);
if (text && text->IsFocus()) {
// We have a text view. See if it currently has the focus and belongs
// to a Spinner control. If so, change the value of the spinner
// TextViews are complicated beasts which are actually multiple views.
// Travel up the hierarchy to see if any of the target's ancestors are
// a Spinner.
BView *view = text->Parent();
while (view) {
Spinner *spin = dynamic_cast<Spinner*>(view);
if (spin) {
int32 step = spin->GetSteps();
if (c == B_DOWN_ARROW)
step = 0 - step;
spin->SetValue(spin->Value() + step);
spin->Invoke();
return B_SKIP_MESSAGE;
}
view = view->Parent();
}
}
return B_DISPATCH_MESSAGE;
}
default:
return B_DISPATCH_MESSAGE;
}
// shut the stupid compiler up
return B_SKIP_MESSAGE;
}
void
BLooper::task_looper()
{
PRINT(("BLooper::task_looper()\n"));
// Check that looper is locked (should be)
AssertLocked();
// Unlock the looper
Unlock();
if (IsLocked())
debugger("looper must not be locked!");
// loop: As long as we are not terminating.
while (!fTerminating) {
PRINT(("LOOPER: outer loop\n"));
// TODO: timeout determination algo
// Read from message port (how do we determine what the timeout is?)
PRINT(("LOOPER: MessageFromPort()...\n"));
BMessage* msg = MessageFromPort();
PRINT(("LOOPER: ...done\n"));
// Did we get a message?
if (msg)
_AddMessagePriv(msg);
// Get message count from port
int32 msgCount = port_count(fMsgPort);
for (int32 i = 0; i < msgCount; ++i) {
// Read 'count' messages from port (so we will not block)
// We use zero as our timeout since we know there is stuff there
msg = MessageFromPort(0);
if (msg)
_AddMessagePriv(msg);
}
// loop: As long as there are messages in the queue and the port is
// empty... and we are not terminating, of course.
bool dispatchNextMessage = true;
while (!fTerminating && dispatchNextMessage) {
PRINT(("LOOPER: inner loop\n"));
// Get next message from queue (assign to fLastMessage after
// locking)
BMessage* message = fDirectTarget->Queue()->NextMessage();
Lock();
fLastMessage = message;
if (fLastMessage == NULL) {
// No more messages: Unlock the looper and terminate the
// dispatch loop.
dispatchNextMessage = false;
} else {
PRINT(("LOOPER: fLastMessage: 0x%lx: %.4s\n", fLastMessage->what,
(char*)&fLastMessage->what));
DBG(fLastMessage->PrintToStream());
// Get the target handler
BHandler* handler = NULL;
BMessage::Private messagePrivate(fLastMessage);
bool usePreferred = messagePrivate.UsePreferredTarget();
if (usePreferred) {
PRINT(("LOOPER: use preferred target\n"));
handler = fPreferred;
if (handler == NULL)
handler = this;
} else {
gDefaultTokens.GetToken(messagePrivate.GetTarget(),
B_HANDLER_TOKEN, (void**)&handler);
// if this handler doesn't belong to us, we drop the message
if (handler != NULL && handler->Looper() != this)
handler = NULL;
PRINT(("LOOPER: use %ld, handler: %p, this: %p\n",
messagePrivate.GetTarget(), handler, this));
}
// Is this a scripting message? (BMessage::HasSpecifiers())
if (handler != NULL && fLastMessage->HasSpecifiers()) {
int32 index = 0;
// Make sure the current specifier is kosher
if (fLastMessage->GetCurrentSpecifier(&index) == B_OK)
handler = resolve_specifier(handler, fLastMessage);
}
if (handler) {
// Do filtering
handler = _TopLevelFilter(fLastMessage, handler);
PRINT(("LOOPER: _TopLevelFilter(): %p\n", handler));
if (handler && handler->Looper() == this)
DispatchMessage(fLastMessage, handler);
}
}
if (fTerminating) {
// we leave the looper locked when we quit
return;
}
message = fLastMessage;
fLastMessage = NULL;
// Unlock the looper
Unlock();
// Delete the current message (fLastMessage)
if (message != NULL)
delete message;
// Are any messages on the port?
if (port_count(fMsgPort) > 0) {
// Do outer loop
dispatchNextMessage = false;
}
}
}
PRINT(("BLooper::task_looper() done\n"));
}
void
BHandler::MessageReceived(BMessage* message)
{
BMessage reply(B_REPLY);
switch (message->what) {
case kMsgStartObserving:
case kMsgStopObserving:
{
BMessenger target;
uint32 what;
if (message->FindMessenger(kObserveTarget, &target) != B_OK
|| message->FindInt32(B_OBSERVE_WHAT_CHANGE, (int32*)&what)
!= B_OK) {
break;
}
ObserverList* list = _ObserverList();
if (list != NULL) {
if (message->what == kMsgStartObserving)
list->Add(target, what);
else
list->Remove(target, what);
}
break;
}
case B_GET_PROPERTY:
{
int32 cur;
BMessage specifier;
int32 form;
const char* prop;
status_t err = message->GetCurrentSpecifier(&cur, &specifier,
&form, &prop);
if (err != B_OK && err != B_BAD_SCRIPT_SYNTAX)
break;
bool known = false;
// B_BAD_SCRIPT_SYNTAX defaults to the Messenger property
if (err == B_BAD_SCRIPT_SYNTAX || cur < 0
|| (strcmp(prop, "Messenger") == 0)) {
err = reply.AddMessenger("result", this);
known = true;
} else if (strcmp(prop, "Suites") == 0) {
err = GetSupportedSuites(&reply);
known = true;
} else if (strcmp(prop, "InternalName") == 0) {
err = reply.AddString("result", Name());
known = true;
}
if (known) {
reply.AddInt32("error", B_OK);
message->SendReply(&reply);
return;
}
// let's try next handler
break;
}
case B_GET_SUPPORTED_SUITES:
{
reply.AddInt32("error", GetSupportedSuites(&reply));
message->SendReply(&reply);
return;
}
}
// ToDo: there is some more work needed here
// (someone in the know should fill in)!
if (fNextHandler) {
// we need to apply the next handler's filters here, too
BHandler* target = Looper()->_HandlerFilter(message, fNextHandler);
if (target != NULL && target != this) {
// TODO: we also need to make sure that "target" is not before
// us in the handler chain - at least in case it wasn't before
// the handler actually targeted with this message - this could
// get ugly, though.
target->MessageReceived(message);
}
} else if (message->what != B_MESSAGE_NOT_UNDERSTOOD
&& (message->WasDropped() || message->HasSpecifiers())) {
printf("BHandler %s: MessageReceived() couldn't understand the message:\n", Name());
message->PrintToStream();
message->SendReply(B_MESSAGE_NOT_UNDERSTOOD);
}
}
void BProcess::DispatchMessage(SLooper* looper)
{
//bout << "BProcess::DispatchMessage: (" << SysCurrentThread() << ")@" << SysGetRunTime() << endl;
BHandler* handler = NULL;
int32_t priority = B_NORMAL_PRIORITY;
bool firstTime = true;
m_lock.LockQuick();
//DbgOnlyFatalErrorIf(m_currentEventConcurrency >= m_maxEventConcurrency, "We have gone past the limit on concurrent handlers!");
if (m_currentEventConcurrency >= m_maxEventConcurrency) {
m_lock.Unlock();
return;
}
m_currentEventConcurrency++;
// The binder driver clears its event time when processing an event,
// so we always must inform it if there is another one to schedule.
m_nextEventTime = B_INFINITE_TIMEOUT;
nsecs_t curTime = exact_SysGetRunTime();
while (1) {
if ((handler = m_pendingHandlers) != NULL
&& handler->NextMessageTime(&priority) <= curTime) {
m_pendingHandlers = handler->m_next;
handler->m_next = handler->m_prev = NULL;
if (m_pendingHandlers) m_pendingHandlers->m_prev = NULL;
handler->defer_scheduling();
} else {
// Nothing to do right now, time to leave.
break;
}
// If this is the first time through the loop, we need to schedule
// the next pending handler so that another SLooper thread can be
// activated to execute it.
if (firstTime) {
ScheduleNextEvent();
firstTime = false;
}
// We are now going to enter user code, don't hold the lock.
m_lock.Unlock();
if (handler->AttemptAcquire(this)) {
shortcutDispatch:
// bout << "BProcess: Thread " << SysCurrentThread() << " dispatch to " << handler << " at pri " << priority << endl;
looper->_SetThreadPriority(priority);
handler->dispatch_message();
// bout << "BProcess: Thread " << SysCurrentThread() << " returned from dispatch!" << endl;
// Update our concept of the time.
curTime = approx_SysGetRunTime();
// Big shortcut (one could even call this an optimization
// for a particular performance test). If this handler
// has the next message that will be processed, just do
// it right now.
m_lock.LockQuick();
// We can do this if... there is a pending message and it is next...
const nsecs_t when = handler->NextMessageTime(&priority);
if (m_pendingHandlers == NULL || when <= m_pendingHandlers->NextMessageTime(NULL)) {
// And ResumeScheduling() wasn't called while processing the message...
if (ResumingScheduling()) {
// The above flagged that this thread called ResumeScheduling(), but it
// really hasn't. Psych!!
ClearSchedulingResumed();
// And it is time for the message.
if (when <= curTime) {
m_lock.Unlock();
// Whoosh!
// bout << "BProcess: Thread " << SysCurrentThread() << " redispatch to same handler!" << endl;
goto shortcutDispatch;
}
}
}
m_lock.Unlock();
handler->ResumeScheduling();
ClearSchedulingResumed();
handler->Release(this);
}
handler->DecRefs(this);
m_lock.LockQuick();
}
// We have handled all available messages. While still holding the
// lock, reduce concurrency and schedule the next event to make sure
// the binder is up-to-date about when it is to occur.
m_currentEventConcurrency--;
ScheduleNextEvent();
m_lock.Unlock();
// bout << "BProcess::DispatchMessage Exit: (" << SysCurrentThread() << ")@" << SysGetRunTime() << endl;
#if TARGET_HOST == TARGET_HOST_WIN32
// Handler thread pool is implemented entirely in user space on Windows.
looper->_SetThreadPriority(B_REAL_TIME_PRIORITY);
#endif
}