Function waitpid

user/src/task.rs:33–43

(pid: usize, exit_code: &mut i32)

}

pub fn waitpid(pid: usize, exit_code: &mut i32) -> isize {
    loop {
        match sys_waitpid(pid as isize, exit_code as *mut _) {
            -2 => {
                yield_();
            }
            // -1 or a real pid
            exit_pid => return exit_pid,
        }
    }
}

pub fn waitpid_nb(pid: usize, exit_code: &mut i32) -> isize {
    sys_waitpid(pid as isize, exit_code as *mut _)