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| author | Jaroslav Kysela <perex@perex.cz> | 2001-04-19 13:53:39 +0000 |
|---|---|---|
| committer | Jaroslav Kysela <perex@perex.cz> | 2001-04-19 13:53:39 +0000 |
| commit | 12a47782cb0ae147a396b6bcbbe7909edd8a47be (patch) | |
| tree | d01f13769040c918e5be629de9246ca7aeb3fc29 /src/control/control_shm.c | |
| parent | 192d3c92263cf7330f7ddbd9cfe46751f4bd46df (diff) | |
| download | alsa-lib-12a47782cb0ae147a396b6bcbbe7909edd8a47be.tar.gz | |
Added ctl_elem_lock and unlock code...
Diffstat (limited to 'src/control/control_shm.c')
| -rw-r--r-- | src/control/control_shm.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/src/control/control_shm.c b/src/control/control_shm.c index f525f178..cbc5aef9 100644 --- a/src/control/control_shm.c +++ b/src/control/control_shm.c @@ -207,6 +207,34 @@ static int snd_ctl_shm_elem_write(snd_ctl_t *ctl, snd_ctl_elem_value_t *control) return err; } +static int snd_ctl_shm_elem_lock(snd_ctl_t *ctl, snd_ctl_elem_id_t *id) +{ + snd_ctl_shm_t *shm = ctl->private_data; + volatile snd_ctl_shm_ctrl_t *ctrl = shm->ctrl; + int err; + ctrl->u.element_lock = *id; + ctrl->cmd = SNDRV_CTL_IOCTL_ELEM_LOCK; + err = snd_ctl_shm_action(ctl); + if (err < 0) + return err; + *id = ctrl->u.element_lock; + return err; +} + +static int snd_ctl_shm_elem_unlock(snd_ctl_t *ctl, snd_ctl_elem_id_t *id) +{ + snd_ctl_shm_t *shm = ctl->private_data; + volatile snd_ctl_shm_ctrl_t *ctrl = shm->ctrl; + int err; + ctrl->u.element_unlock = *id; + ctrl->cmd = SNDRV_CTL_IOCTL_ELEM_UNLOCK; + err = snd_ctl_shm_action(ctl); + if (err < 0) + return err; + *id = ctrl->u.element_unlock; + return err; +} + static int snd_ctl_shm_hwdep_next_device(snd_ctl_t *ctl, int * device) { snd_ctl_shm_t *shm = ctl->private_data; @@ -362,6 +390,8 @@ snd_ctl_ops_t snd_ctl_shm_ops = { element_info: snd_ctl_shm_elem_info, element_read: snd_ctl_shm_elem_read, element_write: snd_ctl_shm_elem_write, + element_lock: snd_ctl_shm_elem_lock, + element_unlock: snd_ctl_shm_elem_unlock, hwdep_next_device: snd_ctl_shm_hwdep_next_device, hwdep_info: snd_ctl_shm_hwdep_info, pcm_next_device: snd_ctl_shm_pcm_next_device, |