133 lines
3.0 KiB
C++
133 lines
3.0 KiB
C++
/* SPDX-FileCopyrightText: 2011-2022 Blender Foundation
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*
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* SPDX-License-Identifier: Apache-2.0 */
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#pragma once
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#include "util/list.h"
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#include "util/string.h"
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#include "util/tbb.h"
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#include "util/thread.h"
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#include "util/unique_ptr.h"
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CCL_NAMESPACE_BEGIN
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class TaskPool;
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class TaskScheduler;
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using TaskRunFunction = std::function<void()>;
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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 multi-line 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 = nullptr); /* 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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static bool canceled(); /* For worker threads, test if current task pool 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 stamp of first task pushed. */
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double start_time;
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/* Number of all tasks pushed to the pool. Cleared after wait_work() and cancel(). */
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int num_tasks_pushed;
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};
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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 single
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* queue holds the task from all pools.
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*/
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class TaskScheduler {
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public:
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static void init(const int num_threads = 0);
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static void exit();
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static void free_memory();
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/* Maximum number of threads that will work on task. Use as little as
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* possible and leave scheduling and splitting up tasks to the scheduler. */
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static int max_concurrency();
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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 unique_ptr<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 can be a lambda without arguments. */
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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(const 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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unique_ptr<thread> worker_thread;
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};
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CCL_NAMESPACE_END
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