67 lines
2.2 KiB
C#
67 lines
2.2 KiB
C#
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using System;
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using System.Collections.Concurrent;
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using System.Threading;
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using UnityEngine;
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namespace Kill.Video
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{
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/// <summary>
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/// 把任意 Action 排到 Unity 主线程执行。
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/// 背景:IL2CPP 的自建后台线程 JVM attach 不可靠,AndroidJavaClass/AndroidJNI
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/// 在这些线程上 FindClass 会偶发返回空,导致"类未找到/偶尔成功偶尔失败"。
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/// 用它在主线程上跑所有 JNI 调用即可稳定。
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/// </summary>
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public static class MainThreadDispatcher
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{
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private static readonly ConcurrentQueue<Action> _pending = new ConcurrentQueue<Action>();
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private static int _mainThreadId = -1;
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private static bool _ensured;
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[RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.AfterSceneLoad)]
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private static void Ensure()
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{
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if (_ensured) return;
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_mainThreadId = Thread.CurrentThread.ManagedThreadId;
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var go = new GameObject("MainThreadDispatcher");
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go.hideFlags = HideFlags.HideAndDontSave;
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UnityEngine.Object.DontDestroyOnLoad(go);
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go.AddComponent<DispatcherBehaviour>();
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_ensured = true;
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}
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public static bool IsMainThread =>
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!_ensured || Thread.CurrentThread.ManagedThreadId == _mainThreadId;
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/// <summary>在主线程执行 action;若调用方已是主线程则直接内联执行。</summary>
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public static void RunOnMainThread(Action action)
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{
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if (action == null) return;
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if (IsMainThread)
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{
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action();
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return;
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}
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using (var done = new ManualResetEventSlim(false))
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{
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_pending.Enqueue(() =>
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{
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try { action(); }
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finally { done.Set(); }
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});
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done.Wait();
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}
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}
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private class DispatcherBehaviour : MonoBehaviour
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{
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private void Update()
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{
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while (_pending.TryDequeue(out var a))
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{
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try { a(); }
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catch (Exception e) { Debug.LogException(e); }
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}
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}
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}
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}
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}
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