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// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use option::{Option, Some, None};
use rt::sched::Scheduler;
use rt::task::Task;
use rt::local_ptr;
use rt::rtio::{EventLoop, IoFactoryObject};
//use borrow::to_uint;
pub trait Local {
fn put(value: ~Self);
fn take() -> ~Self;
fn exists() -> bool;
fn borrow<T>(f: &fn(&mut Self) -> T) -> T;
unsafe fn unsafe_borrow() -> *mut Self;
unsafe fn try_unsafe_borrow() -> Option<*mut Self>;
}
impl Local for Scheduler {
fn put(value: ~Scheduler) { unsafe { local_ptr::put(value) }}
fn take() -> ~Scheduler { unsafe { local_ptr::take() } }
fn exists() -> bool { local_ptr::exists() }
fn borrow<T>(f: &fn(&mut Scheduler) -> T) -> T {
let mut res: Option<T> = None;
let res_ptr: *mut Option<T> = &mut res;
unsafe {
do local_ptr::borrow |sched| {
// rtdebug!("successfully unsafe borrowed sched pointer");
let result = f(sched);
*res_ptr = Some(result);
}
}
match res {
Some(r) => { r }
None => rtabort!("function failed!")
}
}
unsafe fn unsafe_borrow() -> *mut Scheduler { local_ptr::unsafe_borrow() }
unsafe fn try_unsafe_borrow() -> Option<*mut Scheduler> { rtabort!("unimpl") }
}
impl Local for Task {
fn put(_value: ~Task) { rtabort!("unimpl") }
fn take() -> ~Task { rtabort!("unimpl") }
fn exists() -> bool { rtabort!("unimpl") }
fn borrow<T>(f: &fn(&mut Task) -> T) -> T {
do Local::borrow::<Scheduler, T> |sched| {
// rtdebug!("sched about to grab current_task");
match sched.current_task {
Some(~ref mut task) => {
// rtdebug!("current task pointer: %x", to_uint(task));
// rtdebug!("current task heap pointer: %x", to_uint(&task.heap));
f(task)
}
None => {
rtabort!("no scheduler")
}
}
}
}
unsafe fn unsafe_borrow() -> *mut Task {
match (*Local::unsafe_borrow::<Scheduler>()).current_task {
Some(~ref mut task) => {
let s: *mut Task = &mut *task;
return s;
}
None => {
// Don't fail. Infinite recursion
rtabort!("no scheduler")
}
}
}
unsafe fn try_unsafe_borrow() -> Option<*mut Task> {
if Local::exists::<Scheduler>() {
Some(Local::unsafe_borrow())
} else {
None
}
}
}
// XXX: This formulation won't work once ~IoFactoryObject is a real trait pointer
impl Local for IoFactoryObject {
fn put(_value: ~IoFactoryObject) { rtabort!("unimpl") }
fn take() -> ~IoFactoryObject { rtabort!("unimpl") }
fn exists() -> bool { rtabort!("unimpl") }
fn borrow<T>(_f: &fn(&mut IoFactoryObject) -> T) -> T { rtabort!("unimpl") }
unsafe fn unsafe_borrow() -> *mut IoFactoryObject {
let sched = Local::unsafe_borrow::<Scheduler>();
let io: *mut IoFactoryObject = (*sched).event_loop.io().unwrap();
return io;
}
unsafe fn try_unsafe_borrow() -> Option<*mut IoFactoryObject> { rtabort!("unimpl") }
}
#[cfg(test)]
mod test {
use unstable::run_in_bare_thread;
use rt::test::*;
use rt::sched::Scheduler;
use super::*;
#[test]
fn thread_local_scheduler_smoke_test() {
do run_in_bare_thread {
let scheduler = ~new_test_uv_sched();
Local::put(scheduler);
let _scheduler: ~Scheduler = Local::take();
}
}
#[test]
fn thread_local_scheduler_two_instances() {
do run_in_bare_thread {
let scheduler = ~new_test_uv_sched();
Local::put(scheduler);
let _scheduler: ~Scheduler = Local::take();
let scheduler = ~new_test_uv_sched();
Local::put(scheduler);
let _scheduler: ~Scheduler = Local::take();
}
}
#[test]
fn borrow_smoke_test() {
do run_in_bare_thread {
let scheduler = ~new_test_uv_sched();
Local::put(scheduler);
unsafe {
let _scheduler: *mut Scheduler = Local::unsafe_borrow();
}
let _scheduler: ~Scheduler = Local::take();
}
}
#[test]
fn borrow_with_return() {
do run_in_bare_thread {
let scheduler = ~new_test_uv_sched();
Local::put(scheduler);
let res = do Local::borrow::<Scheduler,bool> |_sched| {
true
};
assert!(res);
let _scheduler: ~Scheduler = Local::take();
}
}
}
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