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[ALSA] timer - added tread semaphore 

Timer Midlevel


Signed-off-by: Jaroslav Kysela <perex@suse.cz>
This commit is contained in:
Jaroslav Kysela 2005-04-04 16:44:58 +02:00
parent 54ab87e6f5
commit c1935b4d6e
1 changed files with 37 additions and 20 deletions
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57
sound/core/timer.c
View File

@ -69,6 +69,7 @@ typedef struct {
struct timespec tstamp; /* trigger tstamp */
wait_queue_head_t qchange_sleep;
struct fasync_struct *fasync;
struct semaphore tread_sem;
} snd_timer_user_t;
/* list of timers */
@ -1208,6 +1209,7 @@ static int snd_timer_user_open(struct inode *inode, struct file *file)
return -ENOMEM;
spin_lock_init(&tu->qlock);
init_waitqueue_head(&tu->qchange_sleep);
init_MUTEX(&tu->tread_sem);
tu->ticks = 1;
tu->queue_size = 128;
tu->queue = (snd_timer_read_t *)kmalloc(tu->queue_size * sizeof(snd_timer_read_t), GFP_KERNEL);
@ -1454,18 +1456,23 @@ static int snd_timer_user_tselect(struct file *file, snd_timer_select_t __user *
snd_timer_user_t *tu;
snd_timer_select_t tselect;
char str[32];
int err;
int err = 0;
tu = file->private_data;
if (tu->timeri)
down(&tu->tread_sem);
if (tu->timeri) {
snd_timer_close(tu->timeri);
if (copy_from_user(&tselect, _tselect, sizeof(tselect)))
return -EFAULT;
tu->timeri = NULL;
}
if (copy_from_user(&tselect, _tselect, sizeof(tselect))) {
err = -EFAULT;
goto __err;
}
sprintf(str, "application %i", current->pid);
if (tselect.id.dev_class != SNDRV_TIMER_CLASS_SLAVE)
tselect.id.dev_sclass = SNDRV_TIMER_SCLASS_APPLICATION;
if ((err = snd_timer_open(&tu->timeri, str, &tselect.id, current->pid)) < 0)
return err;
goto __err;
if (tu->queue) {
kfree(tu->queue);
@ -1477,23 +1484,27 @@ static int snd_timer_user_tselect(struct file *file, snd_timer_select_t __user *
}
if (tu->tread) {
tu->tqueue = (snd_timer_tread_t *)kmalloc(tu->queue_size * sizeof(snd_timer_tread_t), GFP_KERNEL);
if (tu->tqueue == NULL) {
snd_timer_close(tu->timeri);
return -ENOMEM;
}
if (tu->tqueue == NULL)
err = -ENOMEM;
} else {
tu->queue = (snd_timer_read_t *)kmalloc(tu->queue_size * sizeof(snd_timer_read_t), GFP_KERNEL);
if (tu->queue == NULL) {
snd_timer_close(tu->timeri);
return -ENOMEM;
}
if (tu->queue == NULL)
err = -ENOMEM;
}
tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
tu->timeri->callback = tu->tread ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
tu->timeri->ccallback = snd_timer_user_ccallback;
tu->timeri->callback_data = (void *)tu;
return 0;
if (err < 0) {
snd_timer_close(tu->timeri);
tu->timeri = NULL;
} else {
tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
tu->timeri->callback = tu->tread ? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
tu->timeri->ccallback = snd_timer_user_ccallback;
tu->timeri->callback_data = (void *)tu;
}
__err:
up(&tu->tread_sem);
return err;
}
static int snd_timer_user_info(struct file *file, snd_timer_info_t __user *_info)
@ -1685,11 +1696,17 @@ static long snd_timer_user_ioctl(struct file *file, unsigned int cmd, unsigned l
{
int xarg;
if (tu->timeri) /* too late */
down(&tu->tread_sem);
if (tu->timeri) { /* too late */
up(&tu->tread_sem);
return -EBUSY;
if (get_user(xarg, p))
}
if (get_user(xarg, p)) {
up(&tu->tread_sem);
return -EFAULT;
}
tu->tread = xarg ? 1 : 0;
up(&tu->tread_sem);
return 0;
}
case SNDRV_TIMER_IOCTL_GINFO: