149 lines
3.6 KiB
C++
149 lines
3.6 KiB
C++
/*
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* Copyright 2011-2013 Blender Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef __UTIL_TASK_H__
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#define __UTIL_TASK_H__
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#include "util/util_list.h"
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#include "util/util_string.h"
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#include "util/util_tbb.h"
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#include "util/util_thread.h"
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#include "util/util_vector.h"
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CCL_NAMESPACE_BEGIN
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class TaskPool;
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class TaskScheduler;
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typedef function<void(void)> TaskRunFunction;
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/* Task Pool
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*
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* Pool of tasks that will be executed by the central TaskScheduler.For each
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* pool, we can wait for all tasks to be done, or cancel them before they are
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* done.
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*
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* TaskRunFunction may be created with std::bind or lambda expressions. */
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class TaskPool {
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public:
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struct Summary {
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/* Time spent to handle all tasks. */
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double time_total;
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/* Number of all tasks handled by this pool. */
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int num_tasks_handled;
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/* A full multiline description of the state of the pool after
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* all work is done.
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*/
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string full_report() const;
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};
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TaskPool();
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~TaskPool();
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void push(TaskRunFunction &&task);
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void wait_work(Summary *stats = NULL); /* work and wait until all tasks are done */
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void cancel(); /* cancel all tasks and wait until they are no longer executing */
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bool canceled(); /* for worker threads, test if canceled */
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protected:
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tbb::task_group tbb_group;
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/* ** Statistics ** */
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/* Time time stamp of first task pushed. */
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double start_time;
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/* Number of all tasks handled by this pool. */
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int num_tasks_handled;
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};
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/* Task Scheduler
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*
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* Central scheduler that holds running threads ready to execute tasks. A singe
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* queue holds the task from all pools. */
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class TaskScheduler {
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public:
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static void init(int num_threads = 0);
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static void exit();
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static void free_memory();
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/* Approximate number of threads that will work on task, which may be lower
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* or higher than the actual number of threads. Use as little as possible and
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* leave splitting up tasks to the scheduler.. */
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static int num_threads();
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protected:
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static thread_mutex mutex;
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static int users;
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static int active_num_threads;
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#ifdef WITH_TBB_GLOBAL_CONTROL
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static tbb::global_control *global_control;
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#endif
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};
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/* Dedicated Task Pool
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*
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* Like a TaskPool, but will launch one dedicated thread to execute all tasks.
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*
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* The run callback that actually executes the task may be created like this:
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* function_bind(&MyClass::task_execute, this, _1, _2) */
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class DedicatedTaskPool {
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public:
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DedicatedTaskPool();
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~DedicatedTaskPool();
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void push(TaskRunFunction &&run, bool front = false);
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void wait(); /* wait until all tasks are done */
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void cancel(); /* cancel all tasks, keep worker thread running */
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bool canceled(); /* for worker thread, test if canceled */
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protected:
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void num_decrease(int done);
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void num_increase();
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void thread_run();
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bool thread_wait_pop(TaskRunFunction &task);
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void clear();
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thread_mutex num_mutex;
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thread_condition_variable num_cond;
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list<TaskRunFunction> queue;
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thread_mutex queue_mutex;
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thread_condition_variable queue_cond;
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int num;
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bool do_cancel;
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bool do_exit;
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thread *worker_thread;
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};
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CCL_NAMESPACE_END
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#endif
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