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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.
/*! The Rust runtime, including the scheduler and I/O interface */
#[doc(hidden)];
use libc::c_char;
use ptr::Ptr;
#[path = "sched/mod.rs"]
mod sched;
mod rtio;
pub mod uvll;
mod uvio;
#[path = "uv/mod.rs"]
mod uv;
#[path = "io/mod.rs"]
mod io;
// FIXME #5248: The import in `sched` doesn't resolve unless this is pub!
pub mod thread_local_storage;
mod work_queue;
mod stack;
mod context;
mod thread;
pub mod env;
pub mod local_services;
mod local_heap;
/// Tools for testing the runtime
#[cfg(test)]
pub mod test;
pub fn start(main: *u8, _argc: int, _argv: **c_char, _crate_map: *u8) -> int {
use self::sched::{Scheduler, Task};
use self::uvio::UvEventLoop;
use sys::Closure;
use ptr;
use cast;
let loop_ = ~UvEventLoop::new();
let mut sched = ~Scheduler::new(loop_);
let main_task = ~do Task::new(&mut sched.stack_pool) {
unsafe {
// `main` is an `fn() -> ()` that doesn't take an environment
// XXX: Could also call this as an `extern "Rust" fn` once they work
let main = Closure {
code: main as *(),
env: ptr::null(),
};
let mainfn: &fn() = cast::transmute(main);
mainfn();
}
};
sched.task_queue.push_back(main_task);
sched.run();
return 0;
}
/// Possible contexts in which Rust code may be executing.
/// Different runtime services are available depending on context.
#[deriving(Eq)]
pub enum RuntimeContext {
// Only the exchange heap is available
GlobalContext,
// The scheduler may be accessed
SchedulerContext,
// Full task services, e.g. local heap, unwinding
TaskContext,
// Running in an old-style task
OldTaskContext
}
pub fn context() -> RuntimeContext {
use task::rt::rust_task;
use self::sched::local_sched;
// XXX: Hitting TLS twice to check if the scheduler exists
// then to check for the task is not good for perf
if unsafe { rust_try_get_task().is_not_null() } {
return OldTaskContext;
} else {
if local_sched::exists() {
let context = ::cell::empty_cell();
do local_sched::borrow |sched| {
if sched.in_task_context() {
context.put_back(TaskContext);
} else {
context.put_back(SchedulerContext);
}
}
return context.take();
} else {
return GlobalContext;
}
}
pub extern {
#[rust_stack]
fn rust_try_get_task() -> *rust_task;
}
}
#[test]
fn test_context() {
use unstable::run_in_bare_thread;
use self::sched::{local_sched, Task};
use self::uvio::UvEventLoop;
use cell::Cell;
assert!(context() == OldTaskContext);
do run_in_bare_thread {
assert!(context() == GlobalContext);
let mut sched = ~UvEventLoop::new_scheduler();
let task = ~do Task::new(&mut sched.stack_pool) {
assert!(context() == TaskContext);
let sched = local_sched::take();
do sched.deschedule_running_task_and_then() |task| {
assert!(context() == SchedulerContext);
let task = Cell(task);
do local_sched::borrow |sched| {
sched.task_queue.push_back(task.take());
}
}
};
sched.task_queue.push_back(task);
sched.run();
}
}
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