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|
/*****************************************************************
|
| Platinum - Task Manager
|
| Copyright (c) 2004-2010, Plutinosoft, LLC.
| All rights reserved.
| http://www.plutinosoft.com
|
| This program is free software; you can redistribute it and/or
| modify it under the terms of the GNU General Public License
| as published by the Free Software Foundation; either version 2
| of the License, or (at your option) any later version.
|
| OEMs, ISVs, VARs and other distributors that combine and
| distribute commercially licensed software with Platinum software
| and do not wish to distribute the source code for the commercially
| licensed software under version 2, or (at your option) any later
| version, of the GNU General Public License (the "GPL") must enter
| into a commercial license agreement with Plutinosoft, LLC.
| licensing@plutinosoft.com
|
| This program is distributed in the hope that it will be useful,
| but WITHOUT ANY WARRANTY; without even the implied warranty of
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
| GNU General Public License for more details.
|
| You should have received a copy of the GNU General Public License
| along with this program; see the file LICENSE.txt. If not, write to
| the Free Software Foundation, Inc.,
| 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
| http://www.gnu.org/licenses/gpl-2.0.html
|
****************************************************************/
/*----------------------------------------------------------------------
| includes
+---------------------------------------------------------------------*/
#include "PltTaskManager.h"
#include "PltThreadTask.h"
NPT_SET_LOCAL_LOGGER("platinum.core.taskmanager")
/*----------------------------------------------------------------------
| PLT_TaskManager::PLT_TaskManager
+---------------------------------------------------------------------*/
PLT_TaskManager::PLT_TaskManager(NPT_Cardinal max_items /* = 0 */) :
m_Queue(NULL),
m_MaxTasks(max_items),
m_RunningTasks(0),
m_Stopping(false)
{
}
/*----------------------------------------------------------------------
| PLT_TaskManager::~PLT_TaskManager
+---------------------------------------------------------------------*/
PLT_TaskManager::~PLT_TaskManager()
{
Abort();
}
/*----------------------------------------------------------------------
| PLT_TaskManager::StartTask
+---------------------------------------------------------------------*/
NPT_Result
PLT_TaskManager::StartTask(PLT_ThreadTask* task,
NPT_TimeInterval* delay /* = NULL*/,
bool auto_destroy /* = true */)
{
NPT_CHECK_POINTER_SEVERE(task);
return task->Start(this, delay, auto_destroy);
}
/*----------------------------------------------------------------------
| PLT_TaskManager::Reset
+---------------------------------------------------------------------*/
NPT_Result
PLT_TaskManager::Reset()
{
NPT_AutoLock lock(m_TasksLock);
m_Stopping = false;
return NPT_SUCCESS;
}
/*----------------------------------------------------------------------
| PLT_TaskManager::Abort
+---------------------------------------------------------------------*/
NPT_Result
PLT_TaskManager::Abort()
{
NPT_Cardinal num_running_tasks;
do {
{
NPT_AutoLock lock(m_TasksLock);
m_Stopping = true;
// unblock the queue if any by deleting it
if (m_Queue) {
int* val = NULL;
while(NPT_SUCCEEDED(m_Queue->Pop(val, 0))) delete val;
delete m_Queue;
m_Queue = NULL;
}
}
// abort all running tasks
{
NPT_AutoLock lock(m_TasksLock);
NPT_List<PLT_ThreadTask*>::Iterator task = m_Tasks.GetFirstItem();
while (task) {
// stop task if it's not already stopping
if (!(*task)->IsAborting(0)) {
(*task)->Stop(false);
}
++task;
}
num_running_tasks = m_Tasks.GetItemCount();
}
if (num_running_tasks == 0)
break;
NPT_System::Sleep(NPT_TimeInterval(0.05));
} while (1);
return NPT_SUCCESS;
}
/*----------------------------------------------------------------------
| PLT_TaskManager::AddTask
+---------------------------------------------------------------------*/
NPT_Result
PLT_TaskManager::AddTask(PLT_ThreadTask* task)
{
NPT_Result result = NPT_SUCCESS;
int *val = NULL;
// verify we're not stopping or maxed out number of running tasks
do {
m_TasksLock.Lock();
// returning an error if we're stopping
if (m_Stopping) {
m_TasksLock.Unlock();
delete val;
if (task->m_AutoDestroy) delete task;
NPT_CHECK_WARNING(NPT_ERROR_INTERRUPTED);
}
if (m_MaxTasks) {
val = val?val:new int;
if (!m_Queue) {
m_Queue = new NPT_Queue<int>(m_MaxTasks);
}
// try to add to queue but don't block forever if queue is full
result = m_Queue->Push(val, 20);
if (NPT_SUCCEEDED(result)) break;
// release lock if it's a failure
// this gives a chance for the taskmanager
// to abort the queue if full
m_TasksLock.Unlock();
// if it failed due to something other than a timeout
// it probably means the queue is aborting
if (result != NPT_ERROR_TIMEOUT) {
delete val;
if (task->m_AutoDestroy) delete task;
NPT_CHECK_WARNING(result);
}
}
} while (result == NPT_ERROR_TIMEOUT);
// start task now
if (NPT_FAILED(result = task->StartThread())) {
m_TasksLock.Unlock();
// Remove task from queue and delete task if autodestroy is set
RemoveTask(task);
return result;
}
NPT_LOG_FINER_3("[TaskManager 0x%p] %d/%d running tasks", (void*)this, ++m_RunningTasks, m_MaxTasks);
// keep track of running task
result = m_Tasks.Add(task);
m_TasksLock.Unlock();
return result;
}
/*----------------------------------------------------------------------
| PLT_TaskManager::RemoveTask
+---------------------------------------------------------------------*/
// called by a PLT_ThreadTask::Run when done
NPT_Result
PLT_TaskManager::RemoveTask(PLT_ThreadTask* task)
{
NPT_Result result = NPT_SUCCESS;
{
NPT_AutoLock lock(m_TasksLock);
if (m_Queue) {
int* val = NULL;
result = m_Queue->Pop(val, 100);
// if for some reason the queue is empty, don't block forever
if (NPT_SUCCEEDED(result)) {
delete val;
} else {
NPT_LOG_WARNING_1("Failed to pop task from queue %d", result);
}
}
NPT_LOG_FINER_3("[TaskManager 0x%p] %d/%d running tasks", (void*)this, --m_RunningTasks, m_MaxTasks);
m_Tasks.Remove(task);
}
// cleanup task only if auto-destroy flag was set
// otherwise it's the owner's responsability to
// clean it up
if (task->m_AutoDestroy) delete task;
return NPT_SUCCESS;
}
|
