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Fix race condition

master
hadashiA 2023-09-12 14:34:53 +09:00
parent 3bac16229f
commit 937d3adf66
1 changed files with 22 additions and 17 deletions
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39
src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/Merge.cs
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@ -65,7 +65,7 @@ namespace Cysharp.Threading.Tasks.Linq
readonly int length;
readonly IUniTaskAsyncEnumerator<T>[] enumerators;
readonly int[] states;
readonly MergeSourceState[] states;
readonly Queue<(T, Exception)> queuedResult = new Queue<(T, Exception)>();
readonly CancellationToken cancellationToken;
@ -75,7 +75,7 @@ namespace Cysharp.Threading.Tasks.Linq
{
this.cancellationToken = cancellationToken;
length = sources.Length;
states = ArrayPool<int>.Shared.Rent(length);
states = ArrayPool<MergeSourceState>.Shared.Rent(length);
enumerators = ArrayPool<IUniTaskAsyncEnumerator<T>>.Shared.Rent(length);
for (var i = 0; i < length; i++)
{
@ -112,18 +112,26 @@ namespace Cysharp.Threading.Tasks.Linq
for (var i = 0; i < length; i++)
{
if (Interlocked.CompareExchange(ref states[i], (int)MergeSourceState.Running, (int)MergeSourceState.Pending) == (int)MergeSourceState.Pending)
lock (queuedResult)
{
var awaiter = enumerators[i].MoveNextAsync().GetAwaiter();
if (awaiter.IsCompleted)
if (states[i] == (int)MergeSourceState.Pending)
{
GetResultAt(i, awaiter);
states[i] = MergeSourceState.Running;
}
else
{
awaiter.SourceOnCompleted(GetResultAtAction, StateTuple.Create(this, i, awaiter));
continue;
}
}
var awaiter = enumerators[i].MoveNextAsync().GetAwaiter();
if (awaiter.IsCompleted)
{
GetResultAt(i, awaiter);
}
else
{
awaiter.SourceOnCompleted(GetResultAtAction, StateTuple.Create(this, i, awaiter));
}
}
return new UniTask<bool>(this, completionSource.Version);
}
@ -135,7 +143,7 @@ namespace Cysharp.Threading.Tasks.Linq
await enumerators[i].DisposeAsync();
}
ArrayPool<int>.Shared.Return(states, true);
ArrayPool<MergeSourceState>.Shared.Return(states, true);
ArrayPool<IUniTaskAsyncEnumerator<T>>.Shared.Return(enumerators, true);
}
@ -153,7 +161,6 @@ namespace Cysharp.Threading.Tasks.Linq
try
{
hasNext = awaiter.GetResult();
Interlocked.Exchange(ref states[index], (int)(hasNext ? MergeSourceState.Pending : MergeSourceState.Completed));
}
catch (Exception ex)
{
@ -167,10 +174,11 @@ namespace Cysharp.Threading.Tasks.Linq
return;
}
var completedAll = IsCompletedAll();
if (hasNext || completedAll)
lock (queuedResult)
{
lock (queuedResult)
states[index] = hasNext ? MergeSourceState.Pending : MergeSourceState.Completed;
var completedAll = !hasNext && IsCompletedAll();
if (hasNext || completedAll)
{
if (completionSource.GetStatus(completionSource.Version).IsCompleted())
{
@ -189,15 +197,12 @@ namespace Cysharp.Threading.Tasks.Linq
{
for (var i = 0; i < length; i++)
{
if (states[i] != (int)MergeSourceState.Completed)
if (states[i] != MergeSourceState.Completed)
{
return false;
}
}
lock (queuedResult)
{
return queuedResult.Count <= 0;
}
return true;
}
}
}