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View Code? Open in Web Editor NEWMutual exclusion for Dart
License: BSD 3-Clause "New" or "Revised" License
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flaky mutex read write test
mutex_readwrite_test.dart seems to be flaky.
From time to time I get this while running the tests for dart-mutex
Expected: a value less than <2100>...
Expected: a value less than <2100>
Actual: <2205>
Which: is not a value less than <2100>
Since DateTime.now() is used it might cause issues because of clock times.
from here:
https://github.com/hoylen/dart-mutex/blob/master/test/mutex_readwrite_test.dart#L171
expect(ms, greaterThan(delay * 10));
expect(ms, lessThan(delay * 10 + overhead));
expect(account.numWrites, equals(10));
Can this use a fake clock instead?
Mutex in different isolates
Is it possible to share a Mutex through different isolates?
Simple mutex use case not working
We've been debugging an issue and have discovered that the mutex isn't working. The mutex is able to .acquire() even though isLocked == true.
static Mutex mutex = new Mutex();
static testMutex() async {
mutex.acquire();
print("Acquired mutex");
try {
await Future.delayed(Duration(seconds: 1));
} finally {
mutex.release();
print("Released mutex");
}
}
Running the testMutex() method results in:
Acquired Mutex
Acquired Mutex
Acquired Mutex
Acquired Mutex
Released mutex
Released mutex
Released mutex
Released mutex
The Mutex isn't causing subsequent acquire() calls to block as expected. We're testing on iOS 13.7 using an iPhone 8 simulator.
Can not acquire write lock.
This test below will timed out.
import 'package:mutex/mutex.dart';
import 'package:test/test.dart';
import 'dart:async';
void main() {
group('Exclusive lock tests', () {
test('test5', () async {
var mutex = ReadWriteMutex();
unawaited(sharedLoop1(mutex));
await mySleep(10);
unawaited(sharedLoop1(mutex));
await mySleep(10);
unawaited(sharedLoop1(mutex));
await mySleep(10);
unawaited(sharedLoop1(mutex));
await mySleep(10);
unawaited(sharedLoop1(mutex));
await mySleep(1000);
await mutex.acquireWrite();
mutex.release();
expect('a', 'a');
});
});
}
Future<void> sharedLoop1(ReadWriteMutex mutex) async {
while (true) {
await mutex.protectRead(() async {
await mySleep(50);
});
}
}
Future<void> mySleep([int ms = 1000]) async {
await Future<void>.delayed(Duration(milliseconds: ms));
}Do mutexes work across isolates?
The documentation should be changed to answer this question.?
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