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/* Copyright (C) 2019, 2021, MariaDB Corporation.
This program is free software; you can redistribute itand /or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
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; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111 - 1301 USA*/
#include <tpool.h>
#include <queue>
#include <mutex>
#include <condition_variable>
#include <tpool_structs.h>
namespace tpool
{
task::task(callback_func func, void* arg, task_group* group) :
m_func(func), m_arg(arg), m_group(group) {}
void task::execute()
{
if (m_group)
{
/* Executing in a group (limiting concurrency).*/
m_group->execute(this);
}
else
{
/* Execute directly. */
m_func(m_arg);
release();
}
}
/* Task that provide wait() operation. */
waitable_task::waitable_task(callback_func func, void* arg, task_group* group) :
task(func,arg, group),m_mtx(),m_cv(),m_ref_count(),m_waiter_count(),m_original_func(){}
void waitable_task::add_ref()
{
std::unique_lock<std::mutex> lk(m_mtx);
m_ref_count++;
}
void waitable_task::release()
{
std::unique_lock<std::mutex> lk(m_mtx);
m_ref_count--;
if (!m_ref_count && m_waiter_count)
m_cv.notify_all();
}
void waitable_task::wait(std::unique_lock<std::mutex>& lk)
{
m_waiter_count++;
while (m_ref_count)
m_cv.wait(lk);
m_waiter_count--;
}
void waitable_task::wait()
{
std::unique_lock<std::mutex> lk(m_mtx);
wait(lk);
}
static void noop(void*)
{
}
void waitable_task::disable()
{
std::unique_lock<std::mutex> lk(m_mtx);
if (m_func == noop)
return;
wait(lk);
m_original_func = m_func;
m_func = noop;
}
void waitable_task::enable()
{
std::unique_lock<std::mutex> lk(m_mtx);
if(m_func != noop)
return;
wait(lk);
m_func = m_original_func;
}
}
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