You have to cast the args to (void *) when calling zmq_threadstart,
and cast the void * argument back to void ** in the child thread.
On Tue, Oct 22, 2013 at 6:29 PM, Laurent Alebarde <l.aleba...@free.fr> wrote:
> Hi Devs,
>
> I am trying to use zmq_threadstart. My first test passing ctx as args works,
> but I need now to pass two arguments. So I tried many ways and all the time
> it ends with a compilor insult :
>
> error: invalid conversion from 'void (*)(void**)' to 'void (*)(void*)'
> [-fpermissive]
> In file included from ../tests/testutil.hpp:24:0,
> from ../tests/test_concurrency_parano.cpp:20:
> ../tests/../include/zmq_utils.h:94:18: error: initializing argument 1 of
> 'void* zmq_threadstart(void (*)(void*), void*)' [-fpermissive]
> make: *** [tests/test_concurrency_parano.o] Error 1
>
> Here is my code exerpt :
>
> struct arg_t {
> void* ctx;
> uint8_t id[8];
> };
>
> for (int i = 0; i < QT_CLIENTS; i++)
> {
> arg_t* args = (arg_t*) malloc(sizeof (arg_t)); // it is up to the
> thread to free it
> args->ctx = ctx;
>
> int rc = build_test_stuff(i, args->id);
> assert (rc == 0);
>
> // start client thread with id
> threads[i] = zmq_threadstart (&client_task, args);
> }
>
> I read many posts on stackoverflow and elsewhere with the same problem with
> pthread_create, but it has not helped me.
>
> Any idea please ?
>
> Laurent
>
>
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>
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Pieter Hintjens
CEO of iMatix.com
Founder of ZeroMQ community
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