[Lazarus] translation from c-header

[Koenraad Lelong]

Hi,

I'm trying to port pigpio to fpc (http://abyz.co.uk/rpi/pigpio/).
h2pas has a problem with this :
c : typedef void *(gpioThreadFunc_t) (void *);
How would this be translated to Pascal ?
I know it's a function without result (= procedure), but what about the 
paramater ?
Later that function/procedure is used like this :
function gpioStartThread(f:gpioThreadFunc_t; 
userdata:pointer):Ppthread_t;cdecl;external;


I also have a doubt about this :

c : typedef void (*gpioTimerFunc_t)    (void);
Pascal : gpioTimerFunc_t = procedure (_para1:pointer);cdecl;

Is this OK ?

I'm not fluent with c, even less with such typedef's.

TIA,

Koenraad