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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use backtrace::Backtrace;
use ipc_channel::ipc::IpcSender;
use panicking;
use serde::Serialize;
use std::any::Any;
use std::thread;
use thread_state;
pub fn spawn_named<F>(name: String, f: F)
where F: FnOnce() + Send + 'static
{
thread::Builder::new().name(name).spawn(f).expect("Thread spawn failed");
}
/// Arrange to send a particular message to a channel if the thread fails.
pub fn spawn_named_with_send_on_panic<F, Id>(name: String,
state: thread_state::ThreadState,
f: F,
id: Id,
panic_chan: IpcSender<(Id, String, String)>)
where F: FnOnce() + Send + 'static,
Id: Copy + Send + Serialize + 'static,
{
thread::Builder::new().name(name).spawn(move || {
thread_state::initialize(state);
panicking::set_thread_local_hook(Box::new(move |payload: &Any| {
debug!("Thread failed, notifying constellation");
let reason = payload.downcast_ref::<String>().map(|s| String::from(&**s))
.or(payload.downcast_ref::<&'static str>().map(|s| String::from(*s)))
.unwrap_or_else(|| String::from("<unknown reason>"));
// FIXME(ajeffrey): Really we should send the backtrace itself,
// not just a string representation. Unfortunately we can't, because
// Servo won't compile backtrace with the serialize-serde feature:
//
// .../quasi_macros-0.9.0/src/lib.rs:19:29: 19:32 error: mismatched types:
// expected `&mut syntex::Registry`,
// found `&mut rustc_plugin::Registry<'_>`
// (expected struct `syntex::Registry`,
// found struct `rustc_plugin::Registry`) [E0308]
// .../quasi_macros-0.9.0/src/lib.rs:19 quasi_codegen::register(reg);
//
// so for the moment we just send a debug string.
let backtrace = format!("{:?}", Backtrace::new());
let _ = panic_chan.send((id, reason, backtrace));
}));
f()
}).expect("Thread spawn failed");
}
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