if gp != nil && gp.m != nil {
		r, err := syscall3(&libpthread_sigthreadmask, uintptr(how), uintptr(unsafe.Pointer(new)), uintptr(unsafe.Pointer(old)))
		if int32(r) != 0 {
			println("syscall sigthreadmask failed: ", hex(err))
			throw("syscall sigthreadmask")
		}
		return
	}
	sigprocmask1(uintptr(how), uintptr(unsafe.Pointer(new)), uintptr(unsafe.Pointer(old)))

}

//go:nosplit
func pthread_self() pthread {