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from alpinelinux
http://git.alpinelinux.org/cgit/aports/tree/main/alsa-lib/alsa-lib-portable-mutex.patch
--- alsa-lib-1.0.27.2.orig/src/conf.c 2013-07-08 14:31:36.000000000 +0200
+++ alsa-lib-1.0.27.2/src/conf.c 2013-10-02 14:32:15.000000000 +0200
@@ -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);
}
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