[PATCH v4 05/23] audio: make jackaudio use qemu_thread_set_name

["Daniel P. Berrangé" <berrange@redhat.com>]

This has greater portability than directly call pthread_setname_np,
which is only 1 out of 3 possible functions for pthreads that can
set the name.

The new API requires a trampoline function, since it can only set
the name of the current thread.

Reviewed-by: Christian Schoenebeck <qemu_oss@crudebyte.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
 audio/jackaudio.c | 30 ++++++++++++++++++++++++------
 1 file changed, 24 insertions(+), 6 deletions(-)

diff --git a/audio/jackaudio.c b/audio/jackaudio.c
index 974a3caad3..69dce3f302 100644
--- a/audio/jackaudio.c
+++ b/audio/jackaudio.c
@@ -629,18 +629,36 @@ static void qjack_enable_in(HWVoiceIn *hw, bool enable)
     ji->c.enabled = enable;
 }
 
-#if !defined(WIN32) && defined(CONFIG_PTHREAD_SETNAME_NP_W_TID)
+#if !defined(WIN32)
+struct QJackThreadData {
+    void *(*function)(void *);
+    void *arg;
+};
+
+static void *qjack_thread_trampoline(void *targ)
+{
+    struct QJackThreadData *data = targ;
+    void *(*function)(void *) = data->function;
+    void *arg = data->arg;
+
+    g_free(data);
+    qemu_thread_set_name("jack-client");
+
+    return function(arg);
+}
+
 static int qjack_thread_creator(jack_native_thread_t *thread,
     const pthread_attr_t *attr, void *(*function)(void *), void *arg)
 {
-    int ret = pthread_create(thread, attr, function, arg);
+    struct QJackThreadData *data = g_new0(struct QJackThreadData, 1);
+    data->function = function;
+    data->arg = arg;
+    int ret = pthread_create(thread, attr, qjack_thread_trampoline, data);
     if (ret != 0) {
+        g_free(data);
         return ret;
     }
 
-    /* set the name of the thread */
-    pthread_setname_np(*thread, "jack-client");
-
     return ret;
 }
 #endif
@@ -696,7 +714,7 @@ static void register_audio_jack(void)
 {
     qemu_mutex_init(&qjack_shutdown_lock);
     audio_driver_register(&jack_driver);
-#if !defined(WIN32) && defined(CONFIG_PTHREAD_SETNAME_NP_W_TID)
+#if !defined(WIN32)
     jack_set_thread_creator(qjack_thread_creator);
 #endif
     jack_set_error_function(qjack_error);
-- 
2.50.1