The document discusses the architecture of UniTask in C#, including the IUniTaskSource interface and AsyncUniTask class. IUniTaskSource defines methods for getting task results and status and handling completions. AsyncUniTask implements IUniTaskSource and manages a state machine and task pool for asynchronous operations. It retrieves tasks from the pool if available or creates new ones, and returns tasks to the pool after completion.

2. 河合 宜文 / Kawai Yoshifumi / @neuecc
Cysharp, Inc.
Cygames
C#大統一理論
C#

3. C#の可能性を切り開いていく
https://github.com/Cysharp

4. A Brief History of
UniRx/UniTask

5. https://twitter.com/neuecc/status/445836676791689216

8. IUniTaskSource in Depth

9. public readonly struct UniTask<T>
{
readonly T result;
readonly IUniTaskSource<T> source;
readonly short token;
}

10. public readonly struct UniTask<T>
{
readonly T result;
readonly IUniTaskSource<T> source;
readonly short token;
}

11. public readonly struct UniTask<T>
{
readonly T result;
readonly IUniTaskSource<T> source;
readonly short token;
}

12. public interface IUniTaskSource<out T>
{
T GetResult(short token);
UniTaskStatus GetStatus(short token);
void OnCompleted(Action<object> continuation, object state, short token);
}

13. internal sealed class AsyncUniTask<TStateMachine, T> :
IStateMachineRunnerPromise<T>, ITaskPoolNode<AsyncUniTask<TStateMachine, T>>,
IUniTaskSource<T> where TStateMachine : IAsyncStateMachine
{
public static void SetStateMachine(ref TStateMachine stateMachine, ref IStateMachineRunnerPro
{
// プールから取得する
if (!pool.TryPop(out var result))
{
result = new AsyncUniTask<TStateMachine, T>();
}
}
public T GetResult(short token)
{
try
{
return core.GetResult(token);
}
finally
{
core.Reset(); // core.version++
return pool.TryPush(this); // プールに返す}
}
}

14. internal sealed class AsyncUniTask<TStateMachine, T> :
IStateMachineRunnerPromise<T>, ITaskPoolNode<AsyncUniTask<TStateMachine, T>>,
IUniTaskSource<T> where TStateMachine : IAsyncStateMachine
{
public static void SetStateMachine(ref TStateMachine stateMachine, ref IStateMachineRunnerPro
{
// プールから取得する
if (!pool.TryPop(out var result))
{
result = new AsyncUniTask<TStateMachine, T>();
}
}
public T GetResult(short token)
{
try
{
return core.GetResult(token);
}
finally
{
core.Reset(); // core.version++
return pool.TryPush(this); // プールに返す}
}
}

15. public interface IUniTaskSource<out T>
{
T GetResult(short token);
UniTaskStatus GetStatus(short token);
void OnCompleted(Action<object> continuation, object state, short token);
}
public readonly struct UniTask<T>
{
readonly T result;
readonly IUniTaskSource<T> source;
readonly short token;
}

16. public interface IUniTaskSource<out T>
{
T GetResult(short token);
UniTaskStatus GetStatus(short token);
void OnCompleted(Action<object> continuation, object state, short token);
}
public readonly struct UniTask<T>
{
readonly T result;
readonly IUniTaskSource<T> source;
readonly short token;
}

17. public interface IUniTaskSource<out T>
{
T GetResult(short token);
UniTaskStatus GetStatus(short token);
void OnCompleted(Action<object> continuation, object state, short token);
}
public readonly struct UniTask<T>
{
readonly T result;
readonly IUniTaskSource<T> source;
readonly short token;
}
if (token != version)
{
throw new InvalidOperationException(
"Token version is not matched,
can not await twice or get Status after await.“
);
}

18. sealed class DelayPromise : IUniTaskSource,
IPlayerLoopItem, ITaskPoolNode<DelayPromise>