2 // Copyright 2012-2014 The Rust Project Developers. See the COPYRIGHT
3 // file at the top-level directory of this distribution and at
4 // http://rust-lang.org/COPYRIGHT.
6 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
7 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
8 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
9 // option. This file may not be copied, modified, or distributed
10 // except according to those terms.
12 #![feature(unsafe_destructor)]
16 // tjc: I don't know why
19 use std::mem::{forget, transmute};
20 use std::mem::{replace, swap};
26 blocked_task: Option<Task>,
30 #[deriving(PartialEq, Show)]
39 pub struct packet<T> {
41 blocked_task: Option<Task>,
45 pub fn packet<T:Send>() -> *packet<T> {
47 let p: *packet<T> = mem::transmute(box Stuff{
49 blocked_task: None::<Task>,
57 pub fn atomic_xchg(_dst: &mut int, _src: int) -> int { fail!(); }
58 pub fn atomic_xchg_acq(_dst: &mut int, _src: int) -> int { fail!(); }
59 pub fn atomic_xchg_rel(_dst: &mut int, _src: int) -> int { fail!(); }
62 // We should consider moving this to ::std::unsafe, although I
63 // suspect graydon would want us to use void pointers instead.
64 pub unsafe fn uniquify<T>(x: *T) -> Box<T> {
68 pub fn swap_state_acq(dst: &mut state, src: state) -> state {
70 transmute(rusti::atomic_xchg_acq(transmute(dst), src as int))
74 pub fn swap_state_rel(dst: &mut state, src: state) -> state {
76 transmute(rusti::atomic_xchg_rel(transmute(dst), src as int))
80 pub fn send<T:Send>(mut p: send_packet<T>, payload: T) {
82 let mut p = unsafe { uniquify(p) };
83 assert!((*p).payload.is_none());
84 (*p).payload = Some(payload);
85 let old_state = swap_state_rel(&mut (*p).state, full);
90 // The receiver will eventually clean this up.
93 full => { fail!("duplicate send") }
96 // The receiver will eventually clean this up.
100 // The receiver will never receive this. Rely on drop_glue
101 // to clean everything up.
106 pub fn recv<T:Send>(mut p: recv_packet<T>) -> Option<T> {
108 let mut p = unsafe { uniquify(p) };
110 let old_state = swap_state_acq(&mut (*p).state,
113 empty | blocked => { task::deschedule(); }
115 let payload = replace(&mut p.payload, None);
116 return Some(payload.unwrap())
119 assert_eq!(old_state, terminated);
126 pub fn sender_terminate<T:Send>(p: *packet<T>) {
127 let mut p = unsafe { uniquify(p) };
128 match swap_state_rel(&mut (*p).state, terminated) {
130 // The receiver will eventually clean up.
134 // This is impossible
135 fail!("you dun goofed")
138 // I have to clean up, use drop_glue
143 pub fn receiver_terminate<T:Send>(p: *packet<T>) {
144 let mut p = unsafe { uniquify(p) };
145 match swap_state_rel(&mut (*p).state, terminated) {
147 // the sender will clean up
151 // this shouldn't happen.
152 fail!("terminating a blocked packet")
154 terminated | full => {
155 // I have to clean up, use drop_glue
160 pub struct send_packet<T> {
161 p: Option<*packet<T>>,
165 impl<T:Send> Drop for send_packet<T> {
169 let self_p: &mut Option<*packet<T>> =
170 mem::transmute(&self.p);
171 let p = replace(self_p, None);
172 sender_terminate(p.unwrap())
178 impl<T:Send> send_packet<T> {
179 pub fn unwrap(&mut self) -> *packet<T> {
180 replace(&mut self.p, None).unwrap()
184 pub fn send_packet<T:Send>(p: *packet<T>) -> send_packet<T> {
190 pub struct recv_packet<T> {
191 p: Option<*packet<T>>,
195 impl<T:Send> Drop for recv_packet<T> {
199 let self_p: &mut Option<*packet<T>> =
200 mem::transmute(&self.p);
201 let p = replace(self_p, None);
202 receiver_terminate(p.unwrap())
208 impl<T:Send> recv_packet<T> {
209 pub fn unwrap(&mut self) -> *packet<T> {
210 replace(&mut self.p, None).unwrap()
214 pub fn recv_packet<T:Send>(p: *packet<T>) -> recv_packet<T> {
220 pub fn entangle<T:Send>() -> (send_packet<T>, recv_packet<T>) {
222 (send_packet(p), recv_packet(p))
229 pub struct ping(::pipes::send_packet<pong>);
230 pub struct pong(::pipes::send_packet<ping>);
232 pub fn liberate_ping(p: ping) -> ::pipes::send_packet<pong> {
234 let _addr : *::pipes::send_packet<pong> = match &p {
235 &ping(ref x) => { mem::transmute(x) }
241 pub fn liberate_pong(p: pong) -> ::pipes::send_packet<ping> {
243 let _addr : *::pipes::send_packet<ping> = match &p {
244 &pong(ref x) => { mem::transmute(x) }
250 pub fn init() -> (client::ping, server::ping) {
257 pub type ping = ::pipes::send_packet<pingpong::ping>;
258 pub type pong = ::pipes::recv_packet<pingpong::pong>;
260 pub fn do_ping(c: ping) -> pong {
261 let (sp, rp) = ::pipes::entangle();
263 ::pipes::send(c, pingpong::ping(sp));
267 pub fn do_pong(c: pong) -> (ping, ()) {
268 let packet = ::pipes::recv(c);
269 if packet.is_none() {
270 fail!("sender closed the connection")
272 (pingpong::liberate_pong(packet.unwrap()), ())
279 pub type ping = ::pipes::recv_packet<pingpong::ping>;
280 pub type pong = ::pipes::send_packet<pingpong::pong>;
282 pub fn do_ping(c: ping) -> (pong, ()) {
283 let packet = ::pipes::recv(c);
284 if packet.is_none() {
285 fail!("sender closed the connection")
287 (pingpong::liberate_ping(packet.unwrap()), ())
290 pub fn do_pong(c: pong) -> ping {
291 let (sp, rp) = ::pipes::entangle();
292 ::pipes::send(c, pingpong::pong(sp));
298 fn client(chan: pingpong::client::ping) {
299 let chan = pingpong::client::do_ping(chan);
300 println!("Sent ping");
301 let (_chan, _data) = pingpong::client::do_pong(chan);
302 println!("Received pong");
305 fn server(chan: pingpong::server::ping) {
306 let (chan, _data) = pingpong::server::do_ping(chan);
307 println!("Received ping");
308 let _chan = pingpong::server::do_pong(chan);
309 println!("Sent pong");
314 // Commented out because of option::get error
316 let (client_, server_) = pingpong::init();
318 task::spawn {|client_|
319 let client__ = client_.take();
322 task::spawn {|server_|
323 let server__ = server_.take();