Merge branch '2191-scheduler-warnings' into 'master'

gthread: Only print scheduler setting warnings once

Closes #2191

See merge request GNOME/glib!1637

1 files changed, 5 insertions, 1 deletions

diff --git a/glib/gthread-posix.c b/glib/gthread-posix.c
index 29bc81a0f..f36055925 100644
--- a/glib/gthread-posix.c
+++ b/glib/gthread-posix.c
@@ -1235,6 +1235,7 @@ static void *
 linux_pthread_proxy (void *data)
 {
   GThreadPosix *thread = data;
+  static gboolean printed_scheduler_warning = FALSE;  /* (atomic) */
 
   /* Set scheduler settings first if requested */
   if (thread->scheduler_settings)
@@ -1247,8 +1248,11 @@ linux_pthread_proxy (void *data)
       tid = (pid_t) syscall (SYS_gettid);
       res = syscall (SYS_sched_setattr, tid, thread->scheduler_settings->attr, flags);
       errsv = errno;
-      if (res == -1)
+      if (res == -1 && g_atomic_int_compare_and_exchange (&printed_scheduler_warning, FALSE, TRUE))
         g_critical ("Failed to set scheduler settings: %s", g_strerror (errsv));
+      else if (res == -1)
+        g_debug ("Failed to set scheduler settings: %s", g_strerror (errsv));
+      printed_scheduler_warning = TRUE;
     }
 
   return thread->proxy (data);