Takashi Iwai c9a0d7d601 conf: Add thread-safe global tree reference ... Most of open functions in alsa-lib have the call pattern: snd_config_update(); return snd_xxx_open(x, snd_config, ...); This means that the toplevel config gets updated, and passed to a local open function. Although snd_config_update() itself has a pthread mutex to be thread safe, the whole procedure above isn't thread safe. Namely, the global snd_config tree may be deleted and recreated at any time while the open function is being processed. This may lead to a data corruption and crash of the program. For avoiding the corruption, this patch introduces a refcount to config tree object. A few new helper functions are introduced as well: - snd_config_update_ref() does update and take the refcount of the toplevel tree. The obtained config tree has to be freed via snd_config_unref() below. - snd_config_ref() and snd_config_unref() manage the refcount of the config object. The latter eventually deletes the object when all references are gone. Along with these additions, the caller of snd_config_update() and snd_config global tree in alsa-lib are replaced with the new helpers. Signed-off-by: Takashi Iwai <tiwai@suse.de>		2016-05-17 15:51:20 +02:00
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hwdep.c	conf: Add thread-safe global tree reference	2016-05-17 15:51:20 +02:00
hwdep_hw.c	Allow hint for ctl, hwdep, timer and seq	2015-04-30 14:52:35 +02:00
hwdep_local.h	Make all the remaining ops structure constants.	2008-11-21 20:48:33 +01:00
hwdep_symbols.c	Changed Jaroslav Kysela's e-mail from perex@suse.cz to perex@perex.cz	2007-10-15 10:24:55 +02:00
Makefile.am	autotools: update style	2014-02-26 08:16:22 +01:00