pthread_once       66 libavcodec/ffjni.c     pthread_once(&once, jni_create_pthread_key);
pthread_once     1437 libavcodec/videotoolboxenc.c     pthread_once(&once_ctrl, loadVTEncSymbols);
pthread_once      126 libavutil/thread.h     ASSERT_PTHREAD(pthread_once, once_control, init_routine);
pthread_once      160 libavutil/thread.h #define ff_thread_once(control, routine) pthread_once(control, routine)