I'm sending this message on behalf of Paul Davis.
---------- Forwarded message ----------
Date: Tue, 12 Feb 2002 15:08:56 -0500
From: Paul Davis <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
Subject: control switch API/code change?
[ TAYBIN: for some reason, i can't send mail to alsa-devel right now.
Could you forward this for me? Thanks. ]
the code below used to work just fine with an older version of
0.9.X. i just upgraded to current CVS, and found that it now causes a
segfault by overwriting h->driver->ctl_handle, apparently before we
even get to the first snd_ctl_elem_read().
for clarity, h->driver->ctl_handle is a snd_ctl_t previously opened
successfully and correctly initialized on entry to this code.
does this ring any bells in anyone's head about changes in the control
interface code?
--p
static void *
hammerfall_monitor_controls (void *arg)
{
jack_hardware_t *hw = (jack_hardware_t *) arg;
hammerfall_t *h = (hammerfall_t *) hw->private;
snd_ctl_elem_id_t *switch_id[3];
snd_ctl_elem_value_t *sw[3];
pthread_setcanceltype (PTHREAD_CANCEL_ASYNCHRONOUS, NULL);
snd_ctl_elem_id_malloc (&switch_id[0]);
snd_ctl_elem_id_malloc (&switch_id[1]);
snd_ctl_elem_id_malloc (&switch_id[2]);
snd_ctl_elem_value_malloc (&sw[0]);
snd_ctl_elem_value_malloc (&sw[1]);
snd_ctl_elem_value_malloc (&sw[2]);
set_control_id (switch_id[0], "ADAT1 Sync Check");
set_control_id (switch_id[1], "ADAT2 Sync Check");
set_control_id (switch_id[2], "ADAT3 Sync Check");
snd_ctl_elem_value_set_id (sw[0], switch_id[0]);
snd_ctl_elem_value_set_id (sw[1], switch_id[1]);
snd_ctl_elem_value_set_id (sw[2], switch_id[2]);
while (1) {
if (snd_ctl_elem_read (h->driver->ctl_handle, sw[0])) {
jack_error ("cannot read control switch 0 ...");
}
hammerfall_check_sync (h, sw[0]);
if (snd_ctl_elem_read (h->driver->ctl_handle, sw[1])) {
jack_error ("cannot read control switch 0 ...");
}
hammerfall_check_sync (h, sw[1]);
if (snd_ctl_elem_read (h->driver->ctl_handle, sw[2])) {
jack_error ("cannot read control switch 0 ...");
}
hammerfall_check_sync (h, sw[2]);
if (nanosleep (&h->monitor_interval, 0)) {
break;
}
}
pthread_exit (0);
}
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