[pulseaudio-discuss] PulseAudio 0.9.21 deadlocking when accessed through OpenAl 1.10.622 (AlienArena)

[Lennart Poettering]

On Tue, 05.01.10 18:02, Kelly Anderson (kelly at silka.with-linux.com) wrote:

> Here is a copy of the function in OpenAl 1.10.622 with a comment on
> when and where the deadlock occurs.

Hmm, and how does context_state_callback() look like? How does it call _signal()?

>     data->context =
> ppa_context_new(ppa_threaded_mainloop_get_api(data->loop),
> data->context_name);
>     if(!data->context)
>     {
>         AL_PRINT("pa_context_new() failed: %s\n",
>                  ppa_strerror(ppa_context_errno(data->context)));

This ppa_context_errno() invocation won't work. Because data->context
will be NULL here. You should treat pa_context_new() failing as
OOM. (but you still do need to handle this, because internally some
SHM is allocated which can realistically fail, and hence needs a
different handling than the usual malloc() returning NULL where
aborting is a good idea.)

>     AL_PRINT("starting pa_context_connect()\n");
>     if(ppa_context_connect(data->context, NULL,
> PA_CONTEXT_NOAUTOSPAWN, NULL) < 0)
>     {

Why do you pass PA_CONTEXT_NOAUTOSPAWN? Unless you have a really good
reason to I can only recommend letting the user control autospawning
and not overriding his wishes. If you set this flag then what the user
configured in client.conf will be overriden, and that is probably not
what you want.

Otherwise the code looked fine though.

Lennart

-- 
Lennart Poettering                        Red Hat, Inc.
lennart [at] poettering [dot] net
http://0pointer.net/lennart/           GnuPG 0x1A015CC4