128 lines
2.9 KiB
C++
128 lines
2.9 KiB
C++
/*
|
|
* Copyright 2011, Blender Foundation.
|
|
*
|
|
* 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.
|
|
*
|
|
* 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 02110-1301, USA.
|
|
*/
|
|
|
|
#ifndef __UTIL_TASK_H__
|
|
#define __UTIL_TASK_H__
|
|
|
|
#include "util_list.h"
|
|
#include "util_thread.h"
|
|
#include "util_vector.h"
|
|
|
|
CCL_NAMESPACE_BEGIN
|
|
|
|
class Task;
|
|
class TaskPool;
|
|
class TaskScheduler;
|
|
|
|
typedef boost::function<void(void)> TaskRunFunction;
|
|
|
|
/* Task
|
|
*
|
|
* Base class for tasks to be executed in threads. */
|
|
|
|
class Task
|
|
{
|
|
public:
|
|
Task() {};
|
|
Task(const TaskRunFunction& run_) : run(run_) {}
|
|
|
|
virtual ~Task() {}
|
|
|
|
TaskRunFunction run;
|
|
};
|
|
|
|
/* Task Pool
|
|
*
|
|
* Pool of tasks that will be executed by the central TaskScheduler.For each
|
|
* pool, we can wait for all tasks to be done, or cancel them before they are
|
|
* done.
|
|
*
|
|
* The run callback that actually executes the task may be create like this:
|
|
* function_bind(&MyClass::task_execute, this, _1, _2) */
|
|
|
|
class TaskPool
|
|
{
|
|
public:
|
|
TaskPool();
|
|
~TaskPool();
|
|
|
|
void push(Task *task, bool front = false);
|
|
void push(const TaskRunFunction& run, bool front = false);
|
|
|
|
void wait_work(); /* work and wait until all tasks are done */
|
|
void cancel(); /* cancel all tasks, keep worker threads running */
|
|
void stop(); /* stop all worker threads */
|
|
|
|
bool cancelled(); /* for worker threads, test if cancelled */
|
|
|
|
protected:
|
|
friend class TaskScheduler;
|
|
|
|
void num_decrease(int done);
|
|
void num_increase();
|
|
|
|
thread_mutex num_mutex;
|
|
thread_condition_variable num_cond;
|
|
|
|
volatile int num;
|
|
volatile bool do_cancel;
|
|
};
|
|
|
|
/* Task Scheduler
|
|
*
|
|
* Central scheduler that holds running threads ready to execute tasks. A singe
|
|
* queue holds the task from all pools. */
|
|
|
|
class TaskScheduler
|
|
{
|
|
public:
|
|
static void init(int num_threads = 0);
|
|
static void exit();
|
|
|
|
static int num_threads() { return threads.size(); }
|
|
|
|
protected:
|
|
friend class TaskPool;
|
|
|
|
struct Entry {
|
|
Task *task;
|
|
TaskPool *pool;
|
|
};
|
|
|
|
static thread_mutex mutex;
|
|
static int users;
|
|
static vector<thread*> threads;
|
|
static vector<int> thread_level;
|
|
static volatile bool do_exit;
|
|
|
|
static list<Entry> queue;
|
|
static thread_mutex queue_mutex;
|
|
static thread_condition_variable queue_cond;
|
|
|
|
static void thread_run(int thread_id);
|
|
static bool thread_wait_pop(Entry& entry);
|
|
|
|
static void push(Entry& entry, bool front);
|
|
static void clear(TaskPool *pool);
|
|
};
|
|
|
|
CCL_NAMESPACE_END
|
|
|
|
#endif
|
|
|