SET_LOCK_HOLDER   663 gc/include/private/gc_locks.h #   define SET_LOCK_HOLDER() GC_lock_holder = pthread_self()
SET_LOCK_HOLDER   689 gc/include/private/gc_locks.h #      define SET_LOCK_HOLDER()
SET_LOCK_HOLDER   700 gc/include/private/gc_locks.h #   define SET_LOCK_HOLDER()