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Merge pull request #2411 from ltetak/diskwriterqueue
Simplified DiskWriterQueue with blocking concurrency
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using System.Threading; | ||
using System.Threading.Tasks; | ||
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namespace LiteDB | ||
{ | ||
/// <summary> | ||
/// Async implementation of ManualResetEvent | ||
/// https://devblogs.microsoft.com/pfxteam/building-async-coordination-primitives-part-1-asyncmanualresetevent/ | ||
/// </summary> | ||
internal class AsyncManualResetEvent | ||
{ | ||
private volatile TaskCompletionSource<bool> _tcs = new TaskCompletionSource<bool>(); | ||
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public Task WaitAsync() | ||
{ | ||
return _tcs.Task; | ||
} | ||
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public void Set() | ||
{ | ||
_tcs.TrySetResult(true); | ||
} | ||
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public void Reset() | ||
{ | ||
while (true) | ||
{ | ||
var tcs = _tcs; | ||
if (!tcs.Task.IsCompleted || | ||
Interlocked.CompareExchange(ref _tcs, new TaskCompletionSource<bool>(), tcs) == tcs) | ||
return; | ||
} | ||
} | ||
} | ||
} |