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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.
//! Language-level runtime services that should reasonably expected
//! to be available 'everywhere'. Local heaps, GC, unwinding,
//! local storage, and logging. Even a 'freestanding' Rust would likely want
//! to implement this.
use prelude::*;
use libc::{c_void, uintptr_t};
use cast::transmute;
use rt::local::Local;
use super::local_heap::LocalHeap;
use rt::logging::StdErrLogger;
pub struct Task {
heap: LocalHeap,
gc: GarbageCollector,
storage: LocalStorage,
logger: StdErrLogger,
unwinder: Option<Unwinder>,
destroyed: bool
}
pub struct GarbageCollector;
pub struct LocalStorage(*c_void, Option<~fn(*c_void)>);
pub struct Unwinder {
unwinding: bool,
}
impl Task {
pub fn new() -> Task {
Task {
heap: LocalHeap::new(),
gc: GarbageCollector,
storage: LocalStorage(ptr::null(), None),
logger: StdErrLogger,
unwinder: Some(Unwinder { unwinding: false }),
destroyed: false
}
}
pub fn without_unwinding() -> Task {
Task {
heap: LocalHeap::new(),
gc: GarbageCollector,
storage: LocalStorage(ptr::null(), None),
logger: StdErrLogger,
unwinder: None,
destroyed: false
}
}
pub fn run(&mut self, f: &fn()) {
// This is just an assertion that `run` was called unsafely
// and this instance of Task is still accessible.
do Local::borrow::<Task> |task| {
assert!(ptr::ref_eq(task, self));
}
match self.unwinder {
Some(ref mut unwinder) => {
// If there's an unwinder then set up the catch block
unwinder.try(f);
}
None => {
// Otherwise, just run the body
f()
}
}
self.destroy();
}
/// Must be called manually before finalization to clean up
/// thread-local resources. Some of the routines here expect
/// Task to be available recursively so this must be
/// called unsafely, without removing Task from
/// thread-local-storage.
fn destroy(&mut self) {
// This is just an assertion that `destroy` was called unsafely
// and this instance of Task is still accessible.
do Local::borrow::<Task> |task| {
assert!(ptr::ref_eq(task, self));
}
match self.storage {
LocalStorage(ptr, Some(ref dtor)) => {
(*dtor)(ptr)
}
_ => ()
}
self.destroyed = true;
}
}
impl Drop for Task {
fn finalize(&self) { assert!(self.destroyed) }
}
// Just a sanity check to make sure we are catching a Rust-thrown exception
static UNWIND_TOKEN: uintptr_t = 839147;
impl Unwinder {
pub fn try(&mut self, f: &fn()) {
use sys::Closure;
unsafe {
let closure: Closure = transmute(f);
let code = transmute(closure.code);
let env = transmute(closure.env);
let token = rust_try(try_fn, code, env);
assert!(token == 0 || token == UNWIND_TOKEN);
}
extern fn try_fn(code: *c_void, env: *c_void) {
unsafe {
let closure: Closure = Closure {
code: transmute(code),
env: transmute(env),
};
let closure: &fn() = transmute(closure);
closure();
}
}
extern {
#[rust_stack]
fn rust_try(f: *u8, code: *c_void, data: *c_void) -> uintptr_t;
}
}
pub fn begin_unwind(&mut self) -> ! {
self.unwinding = true;
unsafe {
rust_begin_unwind(UNWIND_TOKEN);
return transmute(());
}
extern {
fn rust_begin_unwind(token: uintptr_t);
}
}
}
#[cfg(test)]
mod test {
use rt::test::*;
#[test]
fn local_heap() {
do run_in_newsched_task() {
let a = @5;
let b = a;
assert!(*a == 5);
assert!(*b == 5);
}
}
#[test]
fn tls() {
use local_data::*;
do run_in_newsched_task() {
unsafe {
fn key(_x: @~str) { }
local_data_set(key, @~"data");
assert!(*local_data_get(key).get() == ~"data");
fn key2(_x: @~str) { }
local_data_set(key2, @~"data");
assert!(*local_data_get(key2).get() == ~"data");
}
}
}
#[test]
fn unwind() {
do run_in_newsched_task() {
let result = spawntask_try(||());
assert!(result.is_ok());
let result = spawntask_try(|| fail!());
assert!(result.is_err());
}
}
#[test]
fn rng() {
do run_in_newsched_task() {
use rand::{rng, Rng};
let mut r = rng();
let _ = r.next();
}
}
#[test]
fn logging() {
do run_in_newsched_task() {
info!("here i am. logging in a newsched task");
}
}
#[test]
fn comm_oneshot() {
use comm::*;
do run_in_newsched_task {
let (port, chan) = oneshot();
send_one(chan, 10);
assert!(recv_one(port) == 10);
}
}
#[test]
fn comm_stream() {
use comm::*;
do run_in_newsched_task() {
let (port, chan) = stream();
chan.send(10);
assert!(port.recv() == 10);
}
}
}
|
