Implement Mutex for Dart.

Implement Mutex for Dart.

R=brianwilkerson@google.com, paulberry@google.com
BUG=

Committed: https://github.com/dart-lang/sdk/commit/ea23fc8bf34e8b5b3d0d69a4a60ee95cb785bb32

[Brian Wilkerson, 2017-08-25 16:56:44]

lgtm

https://codereview.chromium.org/3006563003/diff/1/pkg/analyzer/lib/src/dart/a...
File pkg/analyzer/lib/src/dart/analysis/mutex.dart (right):

https://codereview.chromium.org/3006563003/diff/1/pkg/analyzer/lib/src/dart/a...
pkg/analyzer/lib/src/dart/analysis/mutex.dart:19: ///     }
You might consider adding a utility method similar to:

Future<Null> guard(void criticalSection()) {
  await acquire();
  try {
    criticalSection();
  } finally {
    release();
  }
}

https://codereview.chromium.org/3006563003/diff/1/pkg/analyzer/test/src/dart/...
File pkg/analyzer/test/src/dart/analysis/mutex_test.dart (right):

https://codereview.chromium.org/3006563003/diff/1/pkg/analyzer/test/src/dart/...
pkg/analyzer/test/src/dart/analysis/mutex_test.dart:1: // Copyright (c) 2016,
the Dart project authors.  Please see the AUTHORS file
2017

[scheglov, 2017-08-25 17:18:28]

https://codereview.chromium.org/3006563003/diff/1/pkg/analyzer/lib/src/dart/a...
File pkg/analyzer/lib/src/dart/analysis/mutex.dart (right):

https://codereview.chromium.org/3006563003/diff/1/pkg/analyzer/lib/src/dart/a...
pkg/analyzer/lib/src/dart/analysis/mutex.dart:19: ///     }
On 2017/08/25 16:56:44, Brian Wilkerson wrote:
> You might consider adding a utility method similar to:
> 
> Future<Null> guard(void criticalSection()) {
>   await acquire();
>   try {
>     criticalSection();
>   } finally {
>     release();
>   }
> }

Done.

[Brian Wilkerson, 2017-08-25 17:21:43]

lgtm

[scheglov, 2017-08-25 17:21:48]

Description was changed from

==========
Implement Mutex for Dart.

R=brianwilkerson@google.com, paulberry@google.com
BUG=
==========

to

==========
Implement Mutex for Dart.

R=brianwilkerson@google.com, paulberry@google.com
BUG=

Committed:
https://github.com/dart-lang/sdk/commit/ea23fc8bf34e8b5b3d0d69a4a60ee95cb785bb32
==========

[scheglov, 2017-08-25 17:21:51]

Committed patchset #2 (id:20001) manually as
ea23fc8bf34e8b5b3d0d69a4a60ee95cb785bb32 (presubmit successful).