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Fix race condition (todo: too wide lock range?)

pull/498/head
hadashiA 2023-09-08 23:38:34 +09:00
parent b195df9773
commit 6e99accf99
2 changed files with 54 additions and 66 deletions
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30
src/UniTask.NetCoreTests/Linq/Merge.cs
View File

@ -13,33 +13,24 @@ namespace NetCoreTests.Linq
[Fact]
public async Task TwoSource()
{
var semaphore = new SemaphoreSlim(1, 1);
var a = UniTaskAsyncEnumerable.Create<string>(async (writer, _) =>
{
await UniTask.SwitchToThreadPool();
await semaphore.WaitAsync();
await writer.YieldAsync("A1");
semaphore.Release();
await semaphore.WaitAsync();
await Task.Delay(TimeSpan.FromMilliseconds(20));
await writer.YieldAsync("A2");
semaphore.Release();
});
var b = UniTaskAsyncEnumerable.Create<string>(async (writer, _) =>
{
await UniTask.SwitchToThreadPool();
await semaphore.WaitAsync();
await Task.Delay(TimeSpan.FromMilliseconds(10));
await writer.YieldAsync("B1");
await writer.YieldAsync("B2");
semaphore.Release();
await semaphore.WaitAsync();
await Task.Delay(TimeSpan.FromMilliseconds(30));
await writer.YieldAsync("B3");
semaphore.Release();
});
var result = await a.Merge(b).ToArrayAsync();
@ -49,33 +40,27 @@ namespace NetCoreTests.Linq
[Fact]
public async Task ThreeSource()
{
var semaphore = new SemaphoreSlim(0, 1);
var a = UniTaskAsyncEnumerable.Create<string>(async (writer, _) =>
{
await UniTask.SwitchToThreadPool();
await semaphore.WaitAsync();
await Task.Delay(TimeSpan.FromMilliseconds(10));
await writer.YieldAsync("A1");
semaphore.Release();
await semaphore.WaitAsync();
await Task.Delay(TimeSpan.FromMilliseconds(30));
await writer.YieldAsync("A2");
semaphore.Release();
});
var b = UniTaskAsyncEnumerable.Create<string>(async (writer, _) =>
{
await UniTask.SwitchToThreadPool();
await semaphore.WaitAsync();
await Task.Delay(TimeSpan.FromMilliseconds(20));
await writer.YieldAsync("B1");
await writer.YieldAsync("B2");
semaphore.Release();
await semaphore.WaitAsync();
await Task.Delay(TimeSpan.FromMilliseconds(40));
await writer.YieldAsync("B3");
semaphore.Release();
});
var c = UniTaskAsyncEnumerable.Create<string>(async (writer, _) =>
@ -83,7 +68,6 @@ namespace NetCoreTests.Linq
await UniTask.SwitchToThreadPool();
await writer.YieldAsync("C1");
semaphore.Release();
});
var result = await a.Merge(b, c).ToArrayAsync();

20
src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/Merge.cs
View File

@ -89,6 +89,8 @@ namespace Cysharp.Threading.Tasks.Linq
cancellationToken.ThrowIfCancellationRequested();
completionSource.Reset();
lock (states)
{
if (TryDequeue(out var queuedValue, out var queuedException))
{
if (queuedException != null)
@ -102,6 +104,7 @@ namespace Cysharp.Threading.Tasks.Linq
}
return new UniTask<bool>(this, completionSource.Version);
}
}
for (var i = 0; i < length; i++)
{
@ -159,7 +162,8 @@ namespace Cysharp.Threading.Tasks.Linq
{
if (!completionSource.TrySetException(ex))
{
lock (resultQueue)
//
lock (states)
{
resultQueue.Enqueue((default, ex));
}
@ -167,27 +171,27 @@ namespace Cysharp.Threading.Tasks.Linq
return;
}
var completed = IsCompletedAll();
if (hasNext || completed)
var completedAll = IsCompletedAll();
if (hasNext || completedAll)
{
lock (states)
{
if (completionSource.GetStatus(completionSource.Version).IsCompleted())
{
lock (resultQueue)
{
resultQueue.Enqueue((enumerators[index].Current, null));
}
}
else
{
Current = enumerators[index].Current;
completionSource.TrySetResult(!completed);
completionSource.TrySetResult(!completedAll);
}
}
}
}
bool TryDequeue(out T value, out Exception ex)
{
lock (resultQueue)
lock (states)
{
if (resultQueue.Count > 0)
{