/// <summary>
/// Add a thread to run tasks.
/// </summary>
/// <returns></returns>
private bool AddThread()
{
int count = 0;
IPoolTask task = FetchTask();
if (task == null)
{
return(false);
}
Task thread = null;
TaskPoolState m_toState;
thread = new Task(() =>
{
while (true)
{
if (task != null)
{
locker.EnterReadLock();
m_toState = toState;
locker.ExitReadLock();
if (m_toState == TaskPoolState.RUN)
{
task.Run();
RemoveRunning(task);
task = null;
/// When finished a task, check <see cref="toState"/>.
locker.EnterReadLock();
m_toState = toState;
locker.ExitReadLock();
if (m_toState == TaskPoolState.RUN)
{
task = FetchTask();
if (task != null)
{
AddRunning(task, thread);
}
}
}
else
{
task.Cancel();
RemoveRunning(task, false);
task = null;
}
}
// When the intent is not to run, then cancel current task,
if (task == null)
{
runningLocker.EnterReadLock();
count = running.Count;
runningLocker.ExitReadLock();
if (count == 0)
{
locker.EnterWriteLock();
currentState = TaskPoolState.PAUSE;
locker.ExitWriteLock();
}
break;
}
}
});
AddRunning(task, thread);
thread.Start();
return(true);
}
/// <summary>
/// Create a thread, and fetch a task to run in it.
/// </summary>
/// <returns></returns>
private bool AddThread()
{
if (toState != TaskPoolState.RUN)
{
return(false);
}
IPoolTask task = taskFetch.FetchNewTask();
if (task == null)
{
return(false);
}
Task thread = null;
thread = new Task(() =>
{
while (true)
{
task.Run();
/// When current task is finished, remove it from <see cref="running"/>.
locker.EnterWriteLock();
running.Remove(task.Key);
locker.ExitWriteLock();
/// If pool will run, then fetch a new task and add it to <see cref="running"/>
if (toState == TaskPoolState.RUN)
{
task = taskFetch.FetchNewTask();
if (task != null)
{
locker.EnterWriteLock();
task.AttachThread(thread);
running.Add(task.Key, task);
locker.ExitWriteLock();
}
}
else
{
task = null;
}
/// When this thread are running to end, get count of running tasks.
/// If count equals 0, it means there is no running task.
/// Then set current state to <see cref="TaskPoolState.PAUSE"/>
if (task == null)
{
int count = 0;
locker.EnterUpgradeableReadLock();
count = running.Count;
if (count == 0)
{
locker.EnterWriteLock();
currentState = TaskPoolState.PAUSE;
locker.ExitWriteLock();
}
locker.ExitUpgradeableReadLock();
break;
}
}
});
task.AttachThread(thread);
locker.EnterWriteLock();
running.Add(task.Key, task);
locker.ExitWriteLock();
thread.Start();
return(true);
}