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Check timer version for read-block workaround

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Check the timer protocl version whether to use poll for a workaround
of read-block problems.
This commit is contained in:
Takashi Iwai 2005-05-15 14:48:19 +00:00
parent 0d0e1a55c2
commit 48bff53b36
2 changed files with 27 additions and 11 deletions
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36
src/pcm/pcm_direct.c
View file

@ -419,18 +419,26 @@ int snd_pcm_direct_async(snd_pcm_t *pcm, int sig, pid_t pid)
/* empty the timer read queue */
void snd_pcm_direct_clear_timer_queue(snd_pcm_direct_t *dmix)
{
struct pollfd fds[4];
int fdn = snd_timer_poll_descriptors(dmix->timer, fds, 4);
while (poll(fds, fdn, 0) > 0) {
/* rbuf might be overwriten by multiple plugins */
/* we don't need the value */
if (dmix->timer_need_poll) {
while (poll(&dmix->timer_fd, 1, 0) > 0) {
/* we don't need the value */
if (dmix->tread) {
snd_timer_tread_t rbuf;
snd_timer_read(dmix->timer, &rbuf, sizeof(rbuf));
} else {
snd_timer_read_t rbuf;
snd_timer_read(dmix->timer, &rbuf, sizeof(rbuf));
}
}
} else {
if (dmix->tread) {
snd_timer_tread_t rbuf;
snd_timer_read(dmix->timer, &rbuf, sizeof(rbuf));
while (snd_timer_read(dmix->timer, &rbuf, sizeof(rbuf)) > 0)
;
} else {
snd_timer_read_t rbuf;
snd_timer_read(dmix->timer, &rbuf, sizeof(rbuf));
while (snd_timer_read(dmix->timer, &rbuf, sizeof(rbuf)) > 0)
;
}
}
}
@ -859,10 +867,10 @@ int snd_pcm_direct_initialize_poll_fd(snd_pcm_direct_t *dmix)
snd_pcm_info_t *info;
snd_timer_params_t *params;
char name[128];
struct pollfd fd;
int capture = dmix->type == SND_PCM_TYPE_DSNOOP ? 1 : 0;
dmix->tread = 0;
dmix->timer_need_poll = 0;
snd_pcm_info_alloca(&info);
snd_timer_params_alloca(&params);
ret = snd_pcm_info(dmix->spcm, info);
@ -886,8 +894,8 @@ int snd_pcm_direct_initialize_poll_fd(snd_pcm_direct_t *dmix)
SNDERR("unable to use timer with fd more than one!!!", name);
return ret;
}
snd_timer_poll_descriptors(dmix->timer, &fd, 1);
dmix->poll_fd = fd.fd;
snd_timer_poll_descriptors(dmix->timer, &dmix->timer_fd, 1);
dmix->poll_fd = dmix->timer_fd.fd;
/*
* A hack to avoid Oops in the older kernel
@ -902,6 +910,12 @@ int snd_pcm_direct_initialize_poll_fd(snd_pcm_direct_t *dmix)
if (ioctl(dmix->poll_fd, SNDRV_TIMER_IOCTL_TREAD, &dmix->tread) < 0)
dmix->tread = 0;
}
/* In older versions, check via poll before read() is needed
* because of the confliction between TIMER_START and
* FIONBIO ioctls.
*/
if (ver < SNDRV_PROTOCOL_VERSION(2, 0, 4))
dmix->timer_need_poll = 1;
}
snd_timer_params_set_auto_start(params, 1);