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Exception and fallback for WaitForBackgroundThread on WebGL #14

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Exception and fallback for WaitForBackgroundThread on WebGL #14

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24 changes: 23 additions & 1 deletion UnityProject/Assets/Plugins/AsyncAwaitUtil/Source/WaitForBackgroundThread.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -7,8 +7,30 @@

public class WaitForBackgroundThread
{
private readonly bool canFallbackToMainThread;
private readonly bool platformSupportsMultithread;

public WaitForBackgroundThread() : this(false) { }

public WaitForBackgroundThread(bool canFallbackToMainThread)
{
this.canFallbackToMainThread = canFallbackToMainThread;
this.platformSupportsMultithread = Application.platform != RuntimePlatform.WebGLPlayer;
}

public ConfiguredTaskAwaitable.ConfiguredTaskAwaiter GetAwaiter()
{
return Task.Run(() => {}).ConfigureAwait(false).GetAwaiter();
if (!platformSupportsMultithread && !canFallbackToMainThread)
{
throw new InvalidOperationException($"{Application.platform} does not support background threads.");
}

return Empty().ConfigureAwait(!platformSupportsMultithread).GetAwaiter();
}

private static async Task Empty()
{
// Task.Run does not run on WebGL, so we use this async method instead.
await Task.Yield();
}
}