The current message queue implementation is very inefficient if you are using
many active ports with few messages. This happens when you use 'call' a lot
on ports which is currently done in dart:io.
This patch does not remove messages from the queue when closing a port. Instead
it drops messages for closed ports when it processes them. This dramatically
speeds up dart:io benchmarks that enqueue tons of writes on a file output
stream.
R=iposva@google.com
BUG=http://dartbug.com/6911
Review URL: https://codereview.chromium.org//11440035
git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@16388 260f80e4-7a28-3924-810f-c04153c831b5
each isolate or native port had a dedicated thread.
Refactored the MessageHandler api...
- Added a Run function to allow a MessageHandler to run on a
ThreadPool. These functions take a start and end callback to allow for
isolate initialization and shutdown.
- Made the queue private to the MessageHandler and moved all message
processing code inside the MessageHandler (got rid of all of the
different flavors of RunLoop). This helps remove some code
duplication and hides the details of how messages are handled.
- Moved all locking and notification out of MessageQueue and moved it
up to MessageHandler. Moved OOB support out of MessageQueue and up
to MessageHandler. These changes make the MessageQueue much
simpler.
- Refactored native port and isolate MessageHandlers to share more code.
- Improved --trace_isolates output.
- Added tests for MessageHandler.
Refactored lib/isolate code...
- Use the new MessageHandler::Run api.
- Got rid of the LongJump stuff in RunIsolate. No longer needed.
- Use the new StartIsolateScope/SwitchIsolateScope to make the code
less verbose and less error-prone.
- Store top-level isolate errors in the sticky_error.
Added StartIsolateScope/SwitchIsolateScope classes.
Review URL: https://chromiumcodereview.appspot.com//9924015
git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@6762 260f80e4-7a28-3924-810f-c04153c831b5
ager@google.com