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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.
#[doc(hidden)];
use libc::c_char;
// Some basic logging
macro_rules! rtdebug_ (
($( $arg:expr),+) => ( {
dumb_println(fmt!( $($arg),+ ));
fn dumb_println(s: &str) {
use io::WriterUtil;
let dbg = ::libc::STDERR_FILENO as ::io::fd_t;
dbg.write_str(s);
dbg.write_str("\n");
}
} )
)
// An alternate version with no output, for turning off logging
macro_rules! rtdebug (
($( $arg:expr),+) => ( $(let _ = $arg)*; )
)
#[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;
#[cfg(stage0)]
pub fn start(main: *u8, _argc: int, _argv: *c_char, _crate_map: *u8) -> int {
use self::sched::{Scheduler, Task};
use self::uvio::UvEventLoop;
let loop_ = ~UvEventLoop::new();
let mut sched = ~Scheduler::new(loop_);
let main_task = ~do Task::new(&mut sched.stack_pool) {
// XXX: Can't call a C function pointer from Rust yet
unsafe { rust_call_nullary_fn(main) };
};
sched.task_queue.push_back(main_task);
sched.run();
return 0;
extern {
fn rust_call_nullary_fn(f: *u8);
}
}
#[cfg(not(stage0))]
pub fn start(main: *u8, _argc: int, _argv: **c_char, _crate_map: *u8) -> int {
use self::sched::{Scheduler, Task};
use self::uvio::UvEventLoop;
let loop_ = ~UvEventLoop::new();
let mut sched = ~Scheduler::new(loop_);
let main_task = ~do Task::new(&mut sched.stack_pool) {
// XXX: Can't call a C function pointer from Rust yet
unsafe { rust_call_nullary_fn(main) };
};
sched.task_queue.push_back(main_task);
sched.run();
return 0;
extern {
fn rust_call_nullary_fn(f: *u8);
}
}
/// Possible contexts in which Rust code may be executing.
/// Different runtime services are available depending on context.
#[deriving(Eq)]
pub enum RuntimeContext {
// Only default services, e.g. exchange heap
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();
}
}
// For setting up tests of the new scheduler
#[cfg(test)]
pub fn run_in_newsched_task(f: ~fn()) {
use cell::Cell;
use unstable::run_in_bare_thread;
use self::sched::Task;
use self::uvio::UvEventLoop;
let f = Cell(Cell(f));
do run_in_bare_thread {
let mut sched = ~UvEventLoop::new_scheduler();
let f = f.take();
let task = ~do Task::new(&mut sched.stack_pool) {
(f.take())();
};
sched.task_queue.push_back(task);
sched.run();
}
}
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