File 0014-conf.c-use-portable-way-to-initialize-recursive-mute.patch of Package alsa
From ae035b7fe5620fcaf4f5ea33ecabcf93b8e056cd Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Timo=20Ter=C3=A4s?= <timo.teras@iki.fi>
Date: Fri, 8 Nov 2013 13:17:58 +0100
Subject: [PATCH] conf.c: use portable way to initialize recursive mutex
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PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP is not in POSIX, as _NP
(non-portable) suggests.
exposing such a symbol in musl libc would lock in the ABI for all
times and makes it impossible to do future changes to the under-
lying struct without hideous symbol versioning hacks.
use the portable way instead: pthread_once was designed for such
cases.
Signed-off-by: Timo Teräs <timo.teras@iki.fi>
Tested-by: John Spencer <maillist-alsa@barfooze.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
---
src/conf.c | 15 +++++++++++++--
1 file changed, 13 insertions(+), 2 deletions(-)
diff --git a/src/conf.c b/src/conf.c
index bfed1c434cab..5ccc8e1a53e5 100644
--- a/src/conf.c
+++ b/src/conf.c
@@ -427,8 +427,8 @@ beginning:</P>
#ifndef DOC_HIDDEN
#ifdef HAVE_LIBPTHREAD
-static pthread_mutex_t snd_config_update_mutex =
- PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
+static pthread_mutex_t snd_config_update_mutex;
+static pthread_once_t snd_config_update_mutex_once = PTHREAD_ONCE_INIT;
#endif
struct _snd_config {
@@ -472,8 +472,19 @@ typedef struct {
#ifdef HAVE_LIBPTHREAD
+static void snd_config_init_mutex(void)
+{
+ pthread_mutexattr_t attr;
+
+ pthread_mutexattr_init(&attr);
+ pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
+ pthread_mutex_init(&snd_config_update_mutex, &attr);
+ pthread_mutexattr_destroy(&attr);
+}
+
static inline void snd_config_lock(void)
{
+ pthread_once(&snd_config_update_mutex_once, snd_config_init_mutex);
pthread_mutex_lock(&snd_config_update_mutex);
}
--
1.8.4.3