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Added a dedicated panic channel.

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This commit is contained in:
Alan Jeffrey 2016-04-15 09:49:13 -05:00
parent a7c885706e
commit cfb066ef20
13 changed files with 108 additions and 232 deletions
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89
components/compositing/constellation.rs
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@ -25,7 +25,7 @@ use gaol;
#[cfg(not(target_os = "windows"))]
use gaol::sandbox::{self, Sandbox, SandboxMethods};
use gfx::font_cache_thread::FontCacheThread;
use gfx_traits::{Epoch, PaintMsg as FromPaintMsg};
use gfx_traits::Epoch;
use ipc_channel::ipc::{self, IpcOneShotServer, IpcSender};
use ipc_channel::router::ROUTER;
use layout_traits::{LayoutControlChan, LayoutThreadFactory};
@ -34,7 +34,7 @@ use msg::constellation_msg::{FrameId, PipelineId};
use msg::constellation_msg::{Key, KeyModifiers, KeyState, LoadData};
use msg::constellation_msg::{PipelineNamespace, PipelineNamespaceId, NavigationDirection};
use msg::constellation_msg::{SubpageId, WindowSizeData};
use msg::constellation_msg::{self, ConstellationChan, Failure};
use msg::constellation_msg::{self, ConstellationChan, PanicMsg};
use msg::webdriver_msg;
use net_traits::image_cache_thread::ImageCacheThread;
use net_traits::storage_thread::{StorageThread, StorageThreadMsg};
@ -95,8 +95,8 @@ pub struct Constellation<LTF, STF> {
/// A channel through which layout thread messages can be sent to this object.
pub layout_sender: ConstellationChan<FromLayoutMsg>,
/// A channel through which paint thread messages can be sent to this object.
pub painter_sender: ConstellationChan<FromPaintMsg>,
/// A channel through which panic messages can be sent to this object.
pub panic_sender: ConstellationChan<PanicMsg>,
/// Receives messages from scripts.
pub script_receiver: Receiver<FromScriptMsg>,
@ -107,8 +107,8 @@ pub struct Constellation<LTF, STF> {
/// Receives messages from the layout thread
pub layout_receiver: Receiver<FromLayoutMsg>,
/// Receives messages from paint thread.
pub painter_receiver: Receiver<FromPaintMsg>,
/// Receives panic messages.
pub panic_receiver: Receiver<PanicMsg>,
/// A channel (the implementation of which is port-specific) through which messages can be sent
/// to the compositor.
@ -320,19 +320,19 @@ impl<LTF: LayoutThreadFactory, STF: ScriptThreadFactory> Constellation<LTF, STF>
let (compositor_sender, compositor_receiver) = channel();
let (ipc_layout_receiver, ipc_layout_sender) = ConstellationChan::<FromLayoutMsg>::new();
let layout_receiver = ROUTER.route_ipc_receiver_to_new_mpsc_receiver(ipc_layout_receiver);
let (ipc_painter_receiver, ipc_painter_sender) = ConstellationChan::<FromPaintMsg>::new();
let painter_receiver = ROUTER.route_ipc_receiver_to_new_mpsc_receiver(ipc_painter_receiver);
let (ipc_panic_receiver, ipc_panic_sender) = ConstellationChan::<PanicMsg>::new();
let panic_receiver = ROUTER.route_ipc_receiver_to_new_mpsc_receiver(ipc_panic_receiver);
let compositor_sender_clone = compositor_sender.clone();
spawn_named("Constellation".to_owned(), move || {
let mut constellation: Constellation<LTF, STF> = Constellation {
script_sender: ipc_script_sender,
compositor_sender: compositor_sender_clone,
layout_sender: ipc_layout_sender,
painter_sender: ipc_painter_sender,
script_receiver: script_receiver,
panic_sender: ipc_panic_sender,
compositor_receiver: compositor_receiver,
layout_receiver: layout_receiver,
painter_receiver: painter_receiver,
panic_receiver: panic_receiver,
compositor_proxy: state.compositor_proxy,
devtools_chan: state.devtools_chan,
resource_thread: state.resource_thread,
@ -416,7 +416,7 @@ impl<LTF: LayoutThreadFactory, STF: ScriptThreadFactory> Constellation<LTF, STF>
parent_info: parent_info,
constellation_chan: self.script_sender.clone(),
layout_to_constellation_chan: self.layout_sender.clone(),
painter_chan: self.painter_sender.clone(),
panic_chan: self.panic_sender.clone(),
scheduler_chan: self.scheduler_chan.clone(),
compositor_proxy: self.compositor_proxy.clone_compositor_proxy(),
devtools_chan: self.devtools_chan.clone(),
@ -548,7 +548,7 @@ impl<LTF: LayoutThreadFactory, STF: ScriptThreadFactory> Constellation<LTF, STF>
Script(FromScriptMsg),
Compositor(FromCompositorMsg),
Layout(FromLayoutMsg),
Paint(FromPaintMsg)
Panic(PanicMsg)
}
// Get one incoming request.
@ -566,16 +566,16 @@ impl<LTF: LayoutThreadFactory, STF: ScriptThreadFactory> Constellation<LTF, STF>
let receiver_from_script = &self.script_receiver;
let receiver_from_compositor = &self.compositor_receiver;
let receiver_from_layout = &self.layout_receiver;
let receiver_from_paint = &self.painter_receiver;
let receiver_from_panic = &self.panic_receiver;
select! {
msg = receiver_from_script.recv() =>
Request::Script(msg.expect("Unexpected script failure in constellation")),
Request::Script(msg.expect("Unexpected script channel panic in constellation")),
msg = receiver_from_compositor.recv() =>
Request::Compositor(msg.expect("Unexpected compositor failure in constellation")),
Request::Compositor(msg.expect("Unexpected compositor channel panic in constellation")),
msg = receiver_from_layout.recv() =>
Request::Layout(msg.expect("Unexpected layout failure in constellation")),
msg = receiver_from_paint.recv() =>
Request::Paint(msg.expect("Unexpected paint failure in constellation"))
Request::Layout(msg.expect("Unexpected layout channel panic in constellation")),
msg = receiver_from_panic.recv() =>
Request::Panic(msg.expect("Unexpected panic channel panic in constellation"))
}
};
@ -655,10 +655,6 @@ impl<LTF: LayoutThreadFactory, STF: ScriptThreadFactory> Constellation<LTF, STF>
// Messages from script
Request::Script(FromScriptMsg::Failure(failure)) => {
debug!("handling script failure message from pipeline {:?}", failure);
self.handle_failure_msg(failure);
}
Request::Script(FromScriptMsg::ScriptLoadedURLInIFrame(load_info)) => {
debug!("constellation got iframe URL load message {:?} {:?} {:?}",
load_info.containing_pipeline_id,
@ -803,10 +799,6 @@ impl<LTF: LayoutThreadFactory, STF: ScriptThreadFactory> Constellation<LTF, STF>
Request::Layout(FromLayoutMsg::ChangeRunningAnimationsState(pipeline_id, animation_state)) => {
self.handle_change_running_animations_state(pipeline_id, animation_state)
}
Request::Layout(FromLayoutMsg::Failure(failure)) => {
debug!("handling paint failure message from pipeline {:?}", failure);
self.handle_failure_msg(failure);
}
Request::Layout(FromLayoutMsg::SetCursor(cursor)) => {
self.handle_set_cursor_msg(cursor)
}
@ -816,15 +808,12 @@ impl<LTF: LayoutThreadFactory, STF: ScriptThreadFactory> Constellation<LTF, STF>
}
// Messages from paint thread
// Panic messages
// Notification that painting has finished and is requesting permission to paint.
Request::Paint(FromPaintMsg::Failure(failure)) => {
debug!("handling paint failure message from pipeline {:?}", failure);
self.handle_failure_msg(failure);
Request::Panic((pipeline_id, panic_reason)) => {
debug!("handling panic message ({:?})", pipeline_id);
self.handle_panic(pipeline_id, panic_reason);
}
}
true
}
@ -851,17 +840,12 @@ impl<LTF: LayoutThreadFactory, STF: ScriptThreadFactory> Constellation<LTF, STF>
}
fn handle_send_error(&mut self, pipeline_id: PipelineId, err: IOError) {
let parent_info = match self.pipelines.get(&pipeline_id) {
None => return warn!("Pipeline {:?} send error after closure.", pipeline_id),
Some(pipeline) => pipeline.parent_info,
};
// Treat send error the same as receiving a failure message
// Treat send error the same as receiving a panic message
debug!("Pipeline {:?} send error ({}).", pipeline_id, err);
let failure = Failure::new(pipeline_id, parent_info);
self.handle_failure_msg(failure);
self.handle_panic(Some(pipeline_id), format!("Send failed ({})", err));
}
fn handle_failure_msg(&mut self, failure: Failure) {
fn handle_panic(&mut self, pipeline_id: Option<PipelineId>, reason: String) {
if opts::get().hard_fail {
// It's quite difficult to make Servo exit cleanly if some threads have failed.
// Hard fail exists for test runners so we crash and that's good enough.
@ -871,15 +855,26 @@ impl<LTF: LayoutThreadFactory, STF: ScriptThreadFactory> Constellation<LTF, STF>
process::exit(1);
}
let window_size = self.pipelines.get(&failure.pipeline_id).and_then(|pipeline| pipeline.size);
debug!("Panic handler for pipeline {:?}: {}.", pipeline_id, reason);
if let Some(pipeline_id) = pipeline_id {
self.replace_pipeline_with_about_failure(pipeline_id);
}
}
fn replace_pipeline_with_about_failure(&mut self, pipeline_id: PipelineId) {
let parent_info = self.pipelines.get(&pipeline_id).and_then(|pipeline| pipeline.parent_info);
let window_size = self.pipelines.get(&pipeline_id).and_then(|pipeline| pipeline.size);
// Notify the browser chrome that the pipeline has failed
self.trigger_mozbrowsererror(failure.pipeline_id);
self.trigger_mozbrowsererror(pipeline_id);
self.close_pipeline(failure.pipeline_id, ExitPipelineMode::Force);
self.close_pipeline(pipeline_id, ExitPipelineMode::Force);
while let Some(pending_pipeline_id) = self.pending_frames.iter().find(|pending| {
pending.old_pipeline_id == Some(failure.pipeline_id)
pending.old_pipeline_id == Some(pipeline_id)
}).map(|frame| frame.new_pipeline_id) {
warn!("removing pending frame change for failed pipeline");
self.close_pipeline(pending_pipeline_id, ExitPipelineMode::Force);
@ -889,12 +884,12 @@ impl<LTF: LayoutThreadFactory, STF: ScriptThreadFactory> Constellation<LTF, STF>
let new_pipeline_id = PipelineId::new();
self.new_pipeline(new_pipeline_id,
failure.parent_info,
parent_info,
window_size,
None,
LoadData::new(Url::parse("about:failure").expect("infallible")));
self.push_pending_frame(new_pipeline_id, Some(failure.pipeline_id));
self.push_pending_frame(new_pipeline_id, Some(pipeline_id));
}