commit 5c312079417908381ffca44d18150b6a990c4f0b
author Dr. David Alan Gilbert <dgilbert@redhat.com> Wed Mar 12 11:48:18 2014 +0000
committer Michael S. Tsirkin <mst@redhat.com> Thu Mar 27 17:48:11 2014 +0200
tree 7bfa5c082c733ea09edd056dde31d8ff04741c2d
parent f7bc8ef8091229a4bec0e2a40af90abb8dcb3834

Detect pthread_setname_np at configure time

Warn if no way of setting thread name is available.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

util/qemu-thread-posix.c

diff --git a/util/qemu-thread-posix.c b/util/qemu-thread-posix.c
index 960d7f5..d05a649 100644
--- a/util/qemu-thread-posix.c
+++ b/util/qemu-thread-posix.c
@@ -32,6 +32,13 @@
 void qemu_thread_naming(bool enable)
 {
     name_threads = enable;
+
+#ifndef CONFIG_THREAD_SETNAME_BYTHREAD
+    /* This is a debugging option, not fatal */
+    if (enable) {
+        fprintf(stderr, "qemu: thread naming not supported on this host\n");
+    }
+#endif
 }
 
 static void error_exit(int err, const char *msg)
@@ -394,6 +401,16 @@
     }
 }
 
+/* Attempt to set the threads name; note that this is for debug, so
+ * we're not going to fail if we can't set it.
+ */
+static void qemu_thread_set_name(QemuThread *thread, const char *name)
+{
+#ifdef CONFIG_PTHREAD_SETNAME_NP
+    pthread_setname_np(thread->thread, name);
+#endif
+}
+
 void qemu_thread_create(QemuThread *thread, const char *name,
                        void *(*start_routine)(void*),
                        void *arg, int mode)
@@ -420,11 +437,9 @@
     if (err)
         error_exit(err, __func__);
 
-#if defined(__GLIBC__) && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 12))
     if (name_threads) {
-        pthread_setname_np(thread->thread, name);
+        qemu_thread_set_name(thread, name);
     }
-#endif
 
     pthread_sigmask(SIG_SETMASK, &oldset, NULL);