Problem with QT / Threads / Signals / Slots

[Frank Bossy]

Dear group :)

I don't quite understand the meaning of this paragraph in the qt docu
(http://doc.trolltech.com/3.1/threads.html):

***SNIP
The Signals and Slots mechanism can be used in separate threads, as
long as the rules for QObject based classes are followed. The Signals
and Slots mechanism is synchronous: when a signal is emitted, all
slots are called immediately. The slots are executed in the thread
context that emitted the signal.
***SNIP

Part of my program consists of the following code:
bool
MyBUE::stopServ er()
{
QProcess* proc = sd.getProcess() ; // already running process
connect(proc, SIGNAL(processE xited()), this,
SLOT(aServerHas Died()));
proc->kill();
cout << "############## #1" << endl;
int counter = 10; // seconds
cout << "############## #2" << endl;
while (proc->isRunning()) {
cout << "############## #3" << endl;
m_waiter.wait(1 000/*ms*/); // A QWaitCondition
cout << "############## #4" << endl;
if (counter-- == 0) break;
cout << "############## #5" << endl;
}
if (proc->isRunning()) {
cout << "############## #6" << endl;
cout << "Could not terminate process." << endl;
cout << "############## #7" << endl;
return false;
}
cout << "Server terminated by stopServer." << endl;
cout << "############## #8" << endl;
return true;
}

void
MyBUE::aServerH asDied()
{
m_waiter.wait(5 000/*ms*/);
cout << "###XXX###" << endl;
}

I get the following result:

############### 1
############### 2
############### 3
<NO PAUSE!?>
############### 4
############### 5
<5 SECONDS PAUSE>
###XXX###
Server terminated by stopServer.
############### 8


Could please someone explain to me this behaviour? I don't understand
it :(

Any help would be greatly appreciated :)

bye,
Frank Bossy

[Victor Bazarov]

Re: Problem with QT / Threads / Signals / Slots

"Frank Bossy" <frank.bossy@ t-systems.com> wrote...[color=blue]
> Dear group :)[/color]

Dear Frank,
[color=blue]
>
> I don't quite understand the meaning of this paragraph in the qt docu
> (http://doc.trolltech.com/3.1/threads.html):
> [...][/color]

Qt, threading, Slots, and related things are not defined by the
C++ language. They happen to be, therefore, outside the scope
of this newsgroup. Perhaps there is a better place to ask your
question, like the TrollTech tech support or, maybe the newsgroup
for your platform... Or even their web site, where I managed to
locate this archive: http://lists.trolltech.com/qt-interest/ ...

Victor