8174690f77
A Worker::Task is an object that can be sent to a worker for
execution. The task is sent to the worker using the messaging
mechanism where the `execute` function of the task will be
called in the thread context of the worker.
There are two kinds of tasks; regular tasks and disposable tasks.
The former are just sent to the worker for execution while the
latter are sent and subsequently disposed of, once the task has
been executed.
A disposable task can be sent to either one worker or to all
workers. In the latter case, the task will be deleted once it
has been executed by all workers.
A semaphore can be associated with a regular task. Once the task
has been executed by the worker, the semaphore will automatically
be posted. That way, it is trivial to send a task for execution
to a worker and wait until the task has been executed. For instance:
Semaphore sem;
MyTask task;
pWorker->execute(&task, &sem);
sem.wait();
const MyResult& result = task.result();
The low level mechanism for posting and broadcasting messages will
be removed.
49 lines
814 B
C++
49 lines
814 B
C++
/*
|
|
* Copyright (c) 2016 MariaDB Corporation Ab
|
|
*
|
|
* Use of this software is governed by the Business Source License included
|
|
* in the LICENSE.TXT file and at www.mariadb.com/bsl11.
|
|
*
|
|
* Change Date: 2019-07-01
|
|
*
|
|
* On the date above, in accordance with the Business Source License, use
|
|
* of this software will be governed by version 2 or later of the General
|
|
* Public License.
|
|
*/
|
|
|
|
#include "maxscale/workertask.hh"
|
|
#include <maxscale/atomic.h>
|
|
|
|
namespace maxscale
|
|
{
|
|
|
|
//
|
|
// WorkerTask
|
|
//
|
|
WorkerTask::~WorkerTask()
|
|
{
|
|
}
|
|
|
|
//
|
|
// WorkerDisposableTask
|
|
//
|
|
WorkerDisposableTask::WorkerDisposableTask()
|
|
: m_count(0)
|
|
{
|
|
}
|
|
|
|
void WorkerDisposableTask::inc_count()
|
|
{
|
|
atomic_add(&m_count, 1);
|
|
}
|
|
|
|
void WorkerDisposableTask::dec_count()
|
|
{
|
|
if (atomic_add(&m_count, -1) == 1)
|
|
{
|
|
delete this;
|
|
}
|
|
}
|
|
|
|
}
|