RWST_WRITE_HELD
if (RWST_WRITE_HELD(l)) {
if (!RWST_WRITE_HELD(l) &&
if (RWST_WRITE_HELD(l)) {
while (RWST_WRITE_HELD(l) ||
if (RWST_WRITE_HELD(l)) {
#define RWST_OWNER(l) (RWST_WRITE_HELD(l) ? \