cast problem pthreads

[=?ISO-8859-1?Q?Andreas_M=FCller?=]

my problem is probably simple to fix but I don't now how,
i have a thread function

void *display(struct Camera *camera)

and i try to create that thread via

pthread_create(&draw_thread, NULL, display, &camera);

when I compile with gcc it works,
using g++ there is an error:
invalid conversion from `void*(*)(Camera*)' to ` void*(*)(void*)'

where is the problem?

 

[Max M.]

void *display(struct Camera *camera)

and i try to create that thread via

pthread_create(&draw_thread, NULL, display, &camera);

when I compile with gcc it works,
using g++ there is an error:
invalid conversion from `void*(*)(Camera*)' to ` void*(*)(void*)'

where is the problem?

The problem is that pthread_create expects an argument of type

void*(*)(void*)

while you provided one of type

void*(*)(Camera*)


Solution: change display's signature so as for it to match pthread_create's
requirements, and cast the argument back to Camera * in the function's body.

Max