/// <summary>把用户工作项放入队列</summary>
/// <param name="task">任务</param>
/// <returns>任务编号</returns>
private Int32 Queue(ThreadTask task)
{
//加锁，防止冲突
lock (Sync_Tasks)
{
Tasks.Add(task.ID, task);
//初始化线程池
if (ManagerThread == null || !ManagerThread.IsAlive)
{
Init();
}
}
//通知管理线程，任务到达
Event.Set();
return(task.ID);
}
/// <summary>取消任务</summary>
/// <param name="id">任务编号</param>
/// <returns>任务状态</returns>
public TaskState Abort(Int32 id)
{
// 重点：
// 这里使用了锁，很危险，所以仅仅在锁里面删除任务，任务的善后处理在锁外面完成
// 要取消的任务
ThreadTask task = null;
// 任务状态
TaskState state = TaskState.Finished;
#region 检查任务是否还在队列里面
if (Tasks.ContainsKey(id))
{
//加锁，防止冲突
lock (Sync_Tasks)
{
if (Tasks.ContainsKey(id))
{
task = Tasks[id];
Tasks.Remove(id);
state = TaskState.Unstarted;
}
}
}
#endregion
#region 检查任务是否正在处理
if (task == null && Threads.Count > 0)
{
lock (SyncLock_Threads)
{
if (Threads.Count > 0)
{
foreach (ThreadX item in Threads)
{
if (item.Task != null && item.Task.ID == id)
{
task = item.Task;
Boolean b = item.Running;
item.Abort(true);
if (b)
{
state = TaskState.Running;
}
else
{
state = TaskState.Finished;
}
}
}
}
}
}
#endregion
if (task == null)
{
state = TaskState.Finished;
}
// 处理任务结束时的事情
if (task != null && task.AbortMethod != null)
{
try { task.AbortMethod(task.Argument); }
catch { }
}
return(state);
}
/// <summary>把用户工作项放入队列</summary>
/// <param name="task">任务</param>
/// <returns>任务编号</returns>
private Int32 Queue(ThreadTask task)
{
//加锁，防止冲突
lock (Sync_Tasks)
{
Tasks.Add(task.ID, task);
//初始化线程池
if (ManagerThread == null || !ManagerThread.IsAlive) Init();
}
//通知管理线程，任务到达
Event.Set();
return task.ID;
}
private void Work()
{
//Alive = true;
while (true)
{
try
{
//挂起自己，直到下一个任务到来
internalEvent.WaitOne(Timeout.Infinite, false);
Running = true;
//信号量复位
internalEvent.Reset();
if (Task != null)
{
ThreadTask task = Task;
WriteLog("新任务" + task.ID);
//task.Thread = this;
//WaitCallback method = Method;
//Object arg = Argument;
LastError = null;
StartTime = DateTime.Now;
//method(arg);
Task.Method(Task.Argument);
}
}
catch (ThreadInterruptedException ex)//中断异常，跳出
{
LastError = ex;
Thread = null;
internalEvent.Close();
internalEvent = null;
break;
}
catch (ThreadAbortException ex)//取消异常，有可能是终止当前任务而已，不需要跳出
{
LastError = ex;
//异常参数指明是否需要终止线程
if (ex.ExceptionState != null && (Boolean)ex.ExceptionState)
{
Thread = null;
internalEvent.Close();
internalEvent = null;
break;
}
}
catch (Exception ex)//其它异常，继续
{
LastError = ex;
ThreadAbortException e = FindException <ThreadAbortException>(ex);
if (e == null)
{
XTrace.WriteException(ex);
}
else
{
//异常参数指明是否需要终止线程
if (e.ExceptionState != null && (Boolean)e.ExceptionState)
{
Thread = null;
internalEvent.Close();
internalEvent = null;
break;
}
}
}
finally
{
//通知事件订阅者，任务已经完成
if (_OnTaskFinished != null)
{
//对不信任方法的调用，捕获所有异常，防止因外部方法的错误而导致线程自身崩溃
try
{
_OnTaskFinished(this, EventArgs.Empty);
}
catch { }
}
//清空任务，防止下一次重复执行
Task = null;
AliveTime = DateTime.Now;
//不管怎么样，都要标志线程不再运行
Running = false;
}
}
//Alive = false;
}
