RTLD_EXCLUSIVE_MASK
if ((cur & RTLD_EXCLUSIVE_MASK) == 0) {
if (cur == (self | RTLD_EXCLUSIVE_MASK)) {
if ((_rtld_mutex & RTLD_EXCLUSIVE_MASK) ||
if (_rtld_mutex & RTLD_EXCLUSIVE_MASK)
unsigned int locked_value = (unsigned int)self | RTLD_EXCLUSIVE_MASK;