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Takashi: added shadow pcm to avoid problem with plug plugin and mmaped access

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This commit is contained in:
Jaroslav Kysela 2003-08-08 09:06:41 +00:00
parent 18927bfe9a
commit 63c19961b9
3 changed files with 17 additions and 2 deletions
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1
src/pcm/pcm_local.h
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@ -201,6 +201,7 @@ struct _snd_pcm {
snd_pcm_rbptr_t hw;
snd_pcm_uframes_t min_align;
int mmap_rw;
int shadow_mmap;
int donot_close;
snd_pcm_channel_info_t *mmap_channels;
snd_pcm_channel_area_t *running_areas;

4
src/pcm/pcm_mmap.c
View file

@ -295,6 +295,8 @@ int snd_pcm_mmap(snd_pcm_t *pcm)
err = pcm->ops->mmap(pcm);
if (err < 0)
return err;
if (pcm->shadow_mmap)
return 0;
pcm->mmap_channels = calloc(pcm->channels, sizeof(pcm->mmap_channels[0]));
if (!pcm->mmap_channels)
return -ENOMEM;
@ -427,6 +429,8 @@ int snd_pcm_munmap(snd_pcm_t *pcm)
unsigned int c;
assert(pcm);
assert(pcm->mmap_channels);
if (pcm->shadow_mmap)
return pcm->ops->munmap(pcm);
for (c = 0; c < pcm->channels; ++c) {
snd_pcm_channel_info_t *i = &pcm->mmap_channels[c];
unsigned int c1;

14
src/pcm/pcm_plug.c
View file

@ -937,13 +937,23 @@ static int snd_pcm_plug_channel_info(snd_pcm_t *pcm, snd_pcm_channel_info_t *inf
return snd_pcm_channel_info(plug->slave, info);
}
static int snd_pcm_plug_mmap(snd_pcm_t *pcm ATTRIBUTE_UNUSED)
static int snd_pcm_plug_mmap(snd_pcm_t *pcm)
{
snd_pcm_plug_t *plug = pcm->private_data;
pcm->mmap_channels = plug->slave->mmap_channels;
pcm->running_areas = plug->slave->running_areas;
pcm->stopped_areas = plug->slave->stopped_areas;
pcm->shadow_mmap = 1;
return 0;
}
static int snd_pcm_plug_munmap(snd_pcm_t *pcm ATTRIBUTE_UNUSED)
static int snd_pcm_plug_munmap(snd_pcm_t *pcm)
{
// snd_pcm_plug_t *plug = pcm->private_data;
pcm->mmap_channels = NULL;
pcm->running_areas = NULL;
pcm->stopped_areas = NULL;
pcm->shadow_mmap = 0;
return 0;
}