pthread_create 1

[Skute]

Hi,

im having trouble launching some threads under linux.
I get the following errors and i have no idea why!

g++ xSockSrv.cpp -o xSockSrv.o -lpthread
xSockSrv.cpp: In member function `bool xSockSrv::AcceptConnectionLoop(void
(*)(tagClient*), void (*)(tagClient*), void (*)(tagClient*, char*, long
unsigned int))':
xSockSrv.cpp:169: invalid conversion from `void*' to `void*(*)(void*)'



Code:
iResult = pthread_create(&m_ptAcceptID, NULL, (void *)&AcceptConnectionLoopThread, this);


Makefile lines:

xSockSrv.o: xSockSrv.cpp xSockSrv.h
g++ -c xSockSrv.cpp -o xSockSrv.o



Any suggestions are most welcome!
(I have included <pthread.h> and linked to pthread library).

 

[gasingh]

As far as I can understand, AcceptConnectionLoopThread is the entry function for your threads.

Third argument to pthread_create() ie entry function is of the type:

void *start_func(void *);

And in your API call, you are typecasting it to (void *) which is wrong.

You shall have a function like

void *start_func(void *arg)
{
// Do Something
while(1)
{
sleep(1);
}
}

And call your API as
pthread_create((&m_ptAcceptID, NULL, start_func, this);

So problem is with your API calling.

 

[Skute]

ahh right thanks alot! works perfect now

i only have 1 more trouble...

getch()...

im using it to see if the user wants to quit the application...but i get segmentation fault whenever the application is run (compiles fine)

unsigned char cQuit = '\0';

printf(&quot;Accepting connections on port %d\n\n&quot;, g_pServer->GetPort());
printf(&quot;Press q to stop the server\n&quot;
cQuit = getch();
if ((cQuit == 'q') || (cQuit == 'Q'))
{
// User wants to quit
....


thats the code, i have the <curses.h> and -lcurses but i still get the error.

 

[gasingh]

I hope you have done initscr() of curses. Because yu have to initialize screen before calling any of its functions.

 

[Skute]

oh right, once again thanks for your quick responses!

ive done that now, but it made the screen go blank until the application quit? normal or should i be calling another function before that?

 

[gasingh]

Hmmm... Its normal.. Curses is fofr graphics like programming... So as soon as you do a initscr(), you have switched on to a virtual screen mode.. Incase you were printing something, you will not be able to do it with printf()/Cout.. Curses provides its own APIs for that..

I have used it but a long time back. I dont remember the APIs currently. Google for Curses.h and you will get a lot of sites explaining the usage.