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Added ctl_elem_lock and unlock code...

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This commit is contained in:
Jaroslav Kysela 2001-04-19 13:53:39 +00:00
parent 192d3c9226
commit 12a47782cb
4 changed files with 74 additions and 0 deletions
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24
src/control/control.c
View file

@ -229,6 +229,30 @@ int snd_ctl_elem_write(snd_ctl_t *ctl, snd_ctl_elem_value_t *control)
return ctl->ops->element_write(ctl, control);
}
/**
* \brief Lock CTL element
* \param ctl CTL handle
* \param control CTL element id pointer
* \return 0 on success otherwise a negative error code
*/
int snd_ctl_elem_lock(snd_ctl_t *ctl, snd_ctl_elem_id_t *id)
{
assert(ctl && id);
return ctl->ops->element_lock(ctl, id);
}
/**
* \brief Unlock CTL element
* \param ctl CTL handle
* \param control CTL element id pointer
* \return 0 on success otherwise a negative error code
*/
int snd_ctl_elem_unlock(snd_ctl_t *ctl, snd_ctl_elem_id_t *id)
{
assert(ctl && id);
return ctl->ops->element_unlock(ctl, id);
}
/**
* \brief Get next hardware dependent device number
* \param ctl CTL handle

18
src/control/control_hw.c
View file

@ -163,6 +163,22 @@ static int snd_ctl_hw_elem_write(snd_ctl_t *handle, snd_ctl_elem_value_t *contro
return 0;
}
static int snd_ctl_hw_elem_lock(snd_ctl_t *handle, snd_ctl_elem_id_t *id)
{
snd_ctl_hw_t *hw = handle->private_data;
if (ioctl(hw->fd, SNDRV_CTL_IOCTL_ELEM_LOCK, id) < 0)
return -errno;
return 0;
}
static int snd_ctl_hw_elem_unlock(snd_ctl_t *handle, snd_ctl_elem_id_t *id)
{
snd_ctl_hw_t *hw = handle->private_data;
if (ioctl(hw->fd, SNDRV_CTL_IOCTL_ELEM_UNLOCK, id) < 0)
return -errno;
return 0;
}
static int snd_ctl_hw_hwdep_next_device(snd_ctl_t *handle, int * device)
{
snd_ctl_hw_t *hw = handle->private_data;
@ -255,6 +271,8 @@ snd_ctl_ops_t snd_ctl_hw_ops = {
element_info: snd_ctl_hw_elem_info,
element_read: snd_ctl_hw_elem_read,
element_write: snd_ctl_hw_elem_write,
element_lock: snd_ctl_hw_elem_lock,
element_unlock: snd_ctl_hw_elem_unlock,
hwdep_next_device: snd_ctl_hw_hwdep_next_device,
hwdep_info: snd_ctl_hw_hwdep_info,
pcm_next_device: snd_ctl_hw_pcm_next_device,

2
src/control/control_local.h
View file

@ -33,6 +33,8 @@ typedef struct _snd_ctl_ops {
int (*element_info)(snd_ctl_t *handle, snd_ctl_elem_info_t *info);
int (*element_read)(snd_ctl_t *handle, snd_ctl_elem_value_t *control);
int (*element_write)(snd_ctl_t *handle, snd_ctl_elem_value_t *control);
int (*element_lock)(snd_ctl_t *handle, snd_ctl_elem_id_t *lock);
int (*element_unlock)(snd_ctl_t *handle, snd_ctl_elem_id_t *unlock);
int (*hwdep_next_device)(snd_ctl_t *handle, int *device);
int (*hwdep_info)(snd_ctl_t *handle, snd_hwdep_info_t * info);
int (*pcm_next_device)(snd_ctl_t *handle, int *device);

30
src/control/control_shm.c
View file

@ -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,