http://sourceware.org/cgi-bin/cvsweb.cgi/~checkout~/linuxthreads/linuxthreads/FAQ.html?rev=1.2.2.1&content-type=text/html&cvsroot=glibc#E

use sched_yield, not pthread_yield

http://bugs.gentoo.org/119762

--- libconsole.c
+++ libconsole.c
@@ -439,7 +439,7 @@
 		ret = 0;
 	}
     } else
-	pthread_yield();
+	sched_yield();
 
     return ret;
 }