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Stall PaintTask exit until it can release all buffers

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It is possible for a PaintTask to start exiting soon after sending new
buffers to the compositor. In that case, the compositor should return
the now unnecessary buffers to the PaintTask so that it can properly
free them.

To accomplish this, the compositor now keeps a hash map of paint task
channels per pipeline id. When a PaintTask exists, the constellation
informs the compositor that it can forget about it. Additionally, the
PaintTask should not wait for any buffers when the engine is doing a
complete shutdown. In that case, the compositor is already halted and
has simply let all buffers leak. We pipe through the shutdown type when
destroying the pipeline to make this decision.

Fixes #2641.
This commit is contained in:
Martin Robinson 2015-01-02 09:34:52 -08:00
parent 141b5d038f
commit c0b397322f
13 changed files with 180 additions and 103 deletions
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20
components/compositing/pipeline.rs
View file

@ -3,15 +3,16 @@
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use CompositorProxy;
use layout_traits::{LayoutTaskFactory, LayoutControlChan};
use layout_traits::{ExitNowMsg, LayoutTaskFactory, LayoutControlChan};
use script_traits::{ScriptControlChan, ScriptTaskFactory};
use script_traits::{AttachLayoutMsg, LoadMsg, NewLayoutInfo, ExitPipelineMsg};
use devtools_traits::DevtoolsControlChan;
use gfx::paint_task;
use gfx::paint_task::{PaintPermissionGranted, PaintPermissionRevoked};
use gfx::paint_task::{PaintChan, PaintTask};
use servo_msg::constellation_msg::{ConstellationChan, Failure, PipelineId, SubpageId};
use servo_msg::constellation_msg::{LoadData, WindowSizeData};
use servo_msg::constellation_msg::{ConstellationChan, ExitMsg, Failure, PipelineId, SubpageId};
use servo_msg::constellation_msg::{LoadData, WindowSizeData, PipelineExitType};
use servo_net::image_cache_task::ImageCacheTask;
use gfx::font_cache_task::FontCacheTask;
use servo_net::resource_task::ResourceTask;
@ -173,18 +174,27 @@ impl Pipeline {
let _ = self.paint_chan.send_opt(PaintPermissionRevoked);
}
pub fn exit(&self) {
pub fn exit(&self, exit_type: PipelineExitType) {
debug!("pipeline {} exiting", self.id);
// Script task handles shutting down layout, and layout handles shutting down the painter.
// For now, if the script task has failed, we give up on clean shutdown.
let ScriptControlChan(ref chan) = self.script_chan;
if chan.send_opt(ExitPipelineMsg(self.id)).is_ok() {
if chan.send_opt(ExitPipelineMsg(self.id, exit_type)).is_ok() {
// Wait until all slave tasks have terminated and run destructors
// NOTE: We don't wait for script task as we don't always own it
let _ = self.paint_shutdown_port.recv_opt();
let _ = self.layout_shutdown_port.recv_opt();
}
}
pub fn force_exit(&self) {
let ScriptControlChan(ref script_channel) = self.script_chan;
let _ = script_channel.send_opt( ExitPipelineMsg(self.id, PipelineExitType::PipelineOnly));
let _ = self.paint_chan.send_opt(paint_task::ExitMsg(None, PipelineExitType::PipelineOnly));
let LayoutControlChan(ref layout_channel) = self.layout_chan;
let _ = layout_channel.send_opt(ExitNowMsg(PipelineExitType::PipelineOnly));
}
pub fn to_sendable(&self) -> CompositionPipeline {