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hi,
i'm newbie in Qt, i'm trying to write some simple multithread program, when i press a button i start a new thread that do whatever, after that i can not completely interact with my interface, i can only move the main form, that's it, i read the forum, i have tryed processEvents() and still nothing any idea? thanks for your help

class Train : public QThread{
...
}

Train* l = new Train(lineEdit17->text(), l2, l1, z_t, s1, s2);
l->start(QThread::LowestPriority);

the entire code is a little more complicated so i haven't posted it all, but making start new thread is like above...

i don't start the thread from its constructor, i start it from the slot of a button, it seems like the main thread waits for the termination of the new one because when i put such a thing:

Train* t = new Train(...);
t->start();
QDebug("xx");

the "xx" shows on the input after the termination of the thread, bizarre...besides even i have some heavy computations it shouldn't work like this, isn't it? the gui shall interact slower but it should, am i wright?

even in each iteration i make it sleep for 0,5 sec.??? when i make it sleep then the main thread should wake up and work, isn't it? if not how could i share the time between the threads? in order the gui works properly?

i don't use systems calls at all, as you said i would like to preempty the thread but it doesn't work, so how could i do it in Qt?

it's still the same thing, i get "xx" just after the only thread terminates, i just don't know what to do

hmmmm, it's very complicated ):

void Lokomotywa::run(){
wysadzony = false;
unsigned int do_stacji = trasy[0]->get_Dystans();
long int indeks_trasy = 0;
bool mozna_do_przodu;
unsigned int przesuniecie;
bool powrot = false;
bool kierunek;

Stacja* s = kierunki[0] ? trasy[0]->get_Stacja_1() : trasy[0]->get_Stacja_2();
while(!s->zajmij_Semafor(this))
this->msleep(50);

while(!wysadzony){
kierunek = powrot ? !kierunki[indeks_trasy] : kierunki[indeks_trasy];
if(do_stacji==trasy[indeks_trasy]->get_Dystans()){
mozna_do_przodu = trasy[indeks_trasy]->rejestruj(this, kierunek);
if(mozna_do_przodu)
s->zwolnij_Semafor(this);
}
if(mozna_do_przodu){
unsigned int c_s = (speed-weigth/1000)/60;//jedna minuta
przesuniecie = trasy[indeks_trasy]->przesun_Semafor(this, kierunek, true, c_s);
do_stacji -= przesuniecie;
c_s -= przesuniecie;
trasy[indeks_trasy]->get_Stacja_1();

if(do_stacji==0&&c_s>0){//za jednym razem nie przeleci wiecej jak jedna trase
if(kierunek)
s = trasy[indeks_trasy]->get_Stacja_2();
else
s = trasy[indeks_trasy]->get_Stacja_1();
if(s->zajmij_Semafor(this)){
trasy[indeks_trasy]->usun_Semafor(this, kierunek, true);
if(!powrot&&++indeks_trasy==(long int)trasy.size()){
indeks_trasy = trasy.size()-1;
powrot = true;
}
if(powrot&&--indeks_trasy==(long int)-1){
indeks_trasy = 0;
powrot = false;
}
mozna_do_przodu = false;
do_stacji = trasy[indeks_trasy]->get_Dystans();
if(s->get_Name()!="")
this->msleep(200);
else
this->msleep(100);
}
else
this->msleep(50);
}
else
this->msleep(100);
}
else
this->msleep(50);
}
it' something like this...it's a simulation of a train, it checks does it can move forward, then it moves and sleeps, that's all(more or less)...

everybody knows polish , sorry but i can't translate all my code, besides i used QMutex for synchronization, nobody has enough knowledge to solve this megadifficult problem? i don't believe...i'm too green in Qt

thanks for advice, i'll try, i would like to create a trail system with trains on it, trains ride, passengers travel, everybody is happy(besides me), and i would like to make on threads...

it's very very bizzarre, i've created a new very simple thread and...it works properly, i must have some mistake in my code, have to find ...

can I call a non-thread method from a running thread? i mean a method that isn't a part of a thread class, because i think the problem is in this, because when i delete all non-thread calling methods it works ok...maybe there is some special way to do this?