popen() in multithreaded program - hangs?
Julian Elischer
julian at elischer.org
Fri Sep 26 23:43:38 UTC 2008
xorquewasp at googlemail.com wrote:
> I'm trying to write a client for the jack audio connection kit
> (http://jackaudio.org), have hit an apparent bug and am not sure
what revision of FreeBSD?
> who's at fault.
>
> This is the client:
>
> --
>
> #include <jack/jack.h>
> #include <err.h>
>
> jack_port_t *input_port;
> jack_port_t *output_port;
> jack_client_t *client;
>
> int
> main (void)
> {
> jack_status_t status;
>
> client = jack_client_open ("cdemo", JackNoStartServer, &status, "default");
> if (!client) errx (112, "client_open: could not");
>
> jack_client_close (client);
> return 0;
> }
>
> --
>
> The jack_client_open() call never returns and the process can only be killed
> with SIGKILL. Tracing execution in gdb shows that the hang occurs in the
> popen() call in jack_get_tmpdir(), defined at client.c:114:
>
> http://trac.jackaudio.org/browser/trunk/jack/libjack/client.c
>
> Is there a known issue with calling popen() in a multithreaded program? At
> the point of that call, on my system, there are three running threads.
>
> Any help/advice on how to resolve this problem would be appreciated.
>
> xw
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