322 lines
8.9 KiB
Rust
322 lines
8.9 KiB
Rust
// xfail-fast
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// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// tjc: I don't know why
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pub mod pipes {
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use core::cast::{forget, transmute};
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pub enum state {
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empty,
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full,
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blocked,
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terminated
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}
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pub impl state : cmp::Eq {
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pure fn eq(&self, other: &state) -> bool {
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((*self) as uint) == ((*other) as uint)
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}
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pure fn ne(&self, other: &state) -> bool { !(*self).eq(other) }
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}
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pub type packet<T: Owned> = {
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mut state: state,
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mut blocked_task: Option<task::Task>,
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mut payload: Option<T>
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};
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pub fn packet<T: Owned>() -> *packet<T> unsafe {
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let p: *packet<T> = cast::transmute(~{
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mut state: empty,
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mut blocked_task: None::<task::Task>,
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mut payload: None::<T>
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});
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p
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}
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#[abi = "rust-intrinsic"]
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mod rusti {
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pub fn atomic_xchg(_dst: &mut int, _src: int) -> int { fail; }
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pub fn atomic_xchg_acq(_dst: &mut int, _src: int) -> int { fail; }
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pub fn atomic_xchg_rel(_dst: &mut int, _src: int) -> int { fail; }
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}
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// We should consider moving this to core::unsafe, although I
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// suspect graydon would want us to use void pointers instead.
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pub unsafe fn uniquify<T>(+x: *T) -> ~T {
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unsafe { cast::transmute(move x) }
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}
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pub fn swap_state_acq(+dst: &mut state, src: state) -> state {
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unsafe {
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transmute(rusti::atomic_xchg_acq(transmute(move dst), src as int))
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}
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}
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pub fn swap_state_rel(+dst: &mut state, src: state) -> state {
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unsafe {
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transmute(rusti::atomic_xchg_rel(transmute(move dst), src as int))
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}
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}
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pub fn send<T: Owned>(-p: send_packet<T>, -payload: T) {
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let p = p.unwrap();
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let p = unsafe { uniquify(p) };
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assert (*p).payload.is_none();
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(*p).payload = move Some(move payload);
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let old_state = swap_state_rel(&mut (*p).state, full);
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match old_state {
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empty => {
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// Yay, fastpath.
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// The receiver will eventually clean this up.
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unsafe { forget(move p); }
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}
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full => { fail ~"duplicate send" }
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blocked => {
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// The receiver will eventually clean this up.
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unsafe { forget(move p); }
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}
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terminated => {
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// The receiver will never receive this. Rely on drop_glue
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// to clean everything up.
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}
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}
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}
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pub fn recv<T: Owned>(-p: recv_packet<T>) -> Option<T> {
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let p = p.unwrap();
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let p = unsafe { uniquify(p) };
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loop {
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let old_state = swap_state_acq(&mut (*p).state,
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blocked);
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match old_state {
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empty | blocked => { task::yield(); }
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full => {
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let mut payload = None;
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payload <-> (*p).payload;
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return Some(option::unwrap(move payload))
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}
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terminated => {
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assert old_state == terminated;
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return None;
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}
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}
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}
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}
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pub fn sender_terminate<T: Owned>(p: *packet<T>) {
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let p = unsafe { uniquify(p) };
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match swap_state_rel(&mut (*p).state, terminated) {
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empty | blocked => {
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// The receiver will eventually clean up.
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unsafe { forget(move p) }
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}
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full => {
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// This is impossible
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fail ~"you dun goofed"
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}
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terminated => {
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// I have to clean up, use drop_glue
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}
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}
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}
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pub fn receiver_terminate<T: Owned>(p: *packet<T>) {
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let p = unsafe { uniquify(p) };
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match swap_state_rel(&mut (*p).state, terminated) {
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empty => {
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// the sender will clean up
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unsafe { forget(move p) }
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}
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blocked => {
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// this shouldn't happen.
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fail ~"terminating a blocked packet"
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}
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terminated | full => {
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// I have to clean up, use drop_glue
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}
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}
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}
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pub struct send_packet<T: Owned> {
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mut p: Option<*packet<T>>,
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}
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pub impl<T: Owned> send_packet<T> : Drop {
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fn finalize(&self) {
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if self.p != None {
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let mut p = None;
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p <-> self.p;
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sender_terminate(option::unwrap(move p))
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}
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}
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}
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pub impl<T: Owned> send_packet<T> {
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fn unwrap() -> *packet<T> {
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let mut p = None;
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p <-> self.p;
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option::unwrap(move p)
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}
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}
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pub fn send_packet<T: Owned>(p: *packet<T>) -> send_packet<T> {
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send_packet {
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p: Some(p)
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}
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}
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pub struct recv_packet<T: Owned> {
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mut p: Option<*packet<T>>,
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}
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pub impl<T: Owned> recv_packet<T> : Drop {
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fn finalize(&self) {
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if self.p != None {
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let mut p = None;
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p <-> self.p;
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receiver_terminate(option::unwrap(move p))
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}
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}
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}
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pub impl<T: Owned> recv_packet<T> {
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fn unwrap() -> *packet<T> {
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let mut p = None;
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p <-> self.p;
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option::unwrap(move p)
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}
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}
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pub fn recv_packet<T: Owned>(p: *packet<T>) -> recv_packet<T> {
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recv_packet {
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p: Some(p)
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}
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}
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pub fn entangle<T: Owned>() -> (send_packet<T>, recv_packet<T>) {
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let p = packet();
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(send_packet(p), recv_packet(p))
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}
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}
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pub mod pingpong {
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use core::cast;
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use core::ptr;
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pub enum ping = ::pipes::send_packet<pong>;
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pub enum pong = ::pipes::send_packet<ping>;
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pub fn liberate_ping(-p: ping) -> ::pipes::send_packet<pong> unsafe {
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let addr : *::pipes::send_packet<pong> = match &p {
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&ping(ref x) => { cast::transmute(ptr::addr_of(x)) }
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};
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let liberated_value = move *addr;
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cast::forget(move p);
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move liberated_value
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}
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pub fn liberate_pong(-p: pong) -> ::pipes::send_packet<ping> unsafe {
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let addr : *::pipes::send_packet<ping> = match &p {
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&pong(ref x) => { cast::transmute(ptr::addr_of(x)) }
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};
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let liberated_value = move *addr;
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cast::forget(move p);
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move liberated_value
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}
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pub fn init() -> (client::ping, server::ping) {
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::pipes::entangle()
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}
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pub mod client {
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use core::option;
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use pingpong;
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pub type ping = ::pipes::send_packet<pingpong::ping>;
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pub type pong = ::pipes::recv_packet<pingpong::pong>;
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pub fn do_ping(-c: ping) -> pong {
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let (sp, rp) = ::pipes::entangle();
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::pipes::send(move c, ping(move sp));
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move rp
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}
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pub fn do_pong(-c: pong) -> (ping, ()) {
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let packet = ::pipes::recv(move c);
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if packet.is_none() {
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fail ~"sender closed the connection"
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}
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(liberate_pong(option::unwrap(move packet)), ())
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}
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}
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pub mod server {
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use pingpong;
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pub type ping = ::pipes::recv_packet<pingpong::ping>;
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pub type pong = ::pipes::send_packet<pingpong::pong>;
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pub fn do_ping(-c: ping) -> (pong, ()) {
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let packet = ::pipes::recv(move c);
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if packet.is_none() {
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fail ~"sender closed the connection"
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}
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(liberate_ping(option::unwrap(move packet)), ())
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}
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pub fn do_pong(-c: pong) -> ping {
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let (sp, rp) = ::pipes::entangle();
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::pipes::send(move c, pong(move sp));
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move rp
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}
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}
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}
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fn client(-chan: pingpong::client::ping) {
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let chan = pingpong::client::do_ping(move chan);
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log(error, ~"Sent ping");
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let (_chan, _data) = pingpong::client::do_pong(move chan);
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log(error, ~"Received pong");
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}
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fn server(-chan: pingpong::server::ping) {
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let (chan, _data) = pingpong::server::do_ping(move chan);
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log(error, ~"Received ping");
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let _chan = pingpong::server::do_pong(move chan);
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log(error, ~"Sent pong");
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}
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fn main() {
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/*
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// Commented out because of option::get error
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let (client_, server_) = pingpong::init();
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let client_ = ~mut some(client_);
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let server_ = ~mut some(server_);
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task::spawn {|move client_|
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let mut client__ = none;
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*client_ <-> client__;
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client(option::unwrap(client__));
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};
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task::spawn {|move server_|
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let mut server_ˊ = none;
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*server_ <-> server_ˊ;
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server(option::unwrap(server_ˊ));
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};
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*/
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}
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