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c7255388e1
The former needs to be allocated once per usage. The later is shared for all threads, which is more efficient. It can also be better debugged.
199 lines
7.5 KiB
C++
199 lines
7.5 KiB
C++
/*************************************************************************/
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/* worker_thread_pool.h */
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/*************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md). */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/*************************************************************************/
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#ifndef WORKER_THREAD_POOL_H
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#define WORKER_THREAD_POOL_H
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#include "core/os/memory.h"
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#include "core/os/os.h"
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#include "core/os/semaphore.h"
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#include "core/os/thread.h"
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#include "core/templates/local_vector.h"
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#include "core/templates/paged_allocator.h"
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#include "core/templates/rid.h"
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#include "core/templates/safe_refcount.h"
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class WorkerThreadPool : public Object {
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GDCLASS(WorkerThreadPool, Object)
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public:
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enum {
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INVALID_TASK_ID = -1
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};
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typedef int64_t TaskID;
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typedef int64_t GroupID;
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private:
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struct Task;
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struct BaseTemplateUserdata {
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virtual void callback() {}
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virtual void callback_indexed(uint32_t p_index) {}
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virtual ~BaseTemplateUserdata() {}
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};
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struct Group {
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GroupID self;
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SafeNumeric<uint32_t> index;
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SafeNumeric<uint32_t> completed_index;
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uint32_t max = 0;
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Semaphore done_semaphore;
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SafeFlag completed;
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SafeNumeric<uint32_t> finished;
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uint32_t tasks_used = 0;
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TightLocalVector<Task *> low_priority_native_tasks;
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};
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struct Task {
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Callable callable;
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void (*native_func)(void *) = nullptr;
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void (*native_group_func)(void *, uint32_t) = nullptr;
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void *native_func_userdata = nullptr;
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String description;
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Semaphore done_semaphore;
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bool completed = false;
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Group *group = nullptr;
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SelfList<Task> task_elem;
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bool waiting = false; // Waiting for completion
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bool low_priority = false;
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BaseTemplateUserdata *template_userdata = nullptr;
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Thread *low_priority_thread = nullptr;
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void free_template_userdata();
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Task() :
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task_elem(this) {}
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};
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PagedAllocator<Task> task_allocator;
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PagedAllocator<Group> group_allocator;
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PagedAllocator<Thread> native_thread_allocator;
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SelfList<Task>::List low_priority_task_queue;
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SelfList<Task>::List task_queue;
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Mutex task_mutex;
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Semaphore task_available_semaphore;
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struct ThreadData {
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uint32_t index;
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Thread thread;
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};
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TightLocalVector<ThreadData> threads;
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SafeFlag exit_threads;
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HashMap<Thread::ID, int> thread_ids;
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HashMap<TaskID, Task *> tasks;
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HashMap<GroupID, Group *> groups;
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bool use_native_low_priority_threads = false;
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uint32_t max_low_priority_threads = 0;
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SafeNumeric<uint32_t> low_priority_threads_used;
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uint64_t last_task = 1;
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static void _thread_function(void *p_user);
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static void _native_low_priority_thread_function(void *p_user);
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void _process_task_queue();
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void _process_task(Task *task);
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void _post_task(Task *p_task, bool p_high_priority);
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static WorkerThreadPool *singleton;
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TaskID _add_task(const Callable &p_callable, void (*p_func)(void *), void *p_userdata, BaseTemplateUserdata *p_template_userdata, bool p_high_priority, const String &p_description);
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GroupID _add_group_task(const Callable &p_callable, void (*p_func)(void *, uint32_t), void *p_userdata, BaseTemplateUserdata *p_template_userdata, int p_elements, int p_tasks, bool p_high_priority, const String &p_description);
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template <class C, class M, class U>
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struct TaskUserData : public BaseTemplateUserdata {
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C *instance;
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M method;
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U userdata;
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virtual void callback() override {
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(instance->*method)(userdata);
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}
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};
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template <class C, class M, class U>
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struct GroupUserData : public BaseTemplateUserdata {
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C *instance;
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M method;
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U userdata;
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virtual void callback_indexed(uint32_t p_index) override {
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(instance->*method)(p_index, userdata);
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}
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};
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protected:
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static void _bind_methods();
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public:
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template <class C, class M, class U>
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TaskID add_template_task(C *p_instance, M p_method, U p_userdata, bool p_high_priority = false, const String &p_description = String()) {
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typedef TaskUserData<C, M, U> TUD;
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TUD *ud = memnew(TUD);
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ud->instance = p_instance;
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ud->method = p_method;
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ud->userdata = p_userdata;
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return _add_task(Callable(), nullptr, nullptr, ud, p_high_priority, p_description);
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}
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TaskID add_native_task(void (*p_func)(void *), void *p_userdata, bool p_high_priority = false, const String &p_description = String());
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TaskID add_task(const Callable &p_action, bool p_high_priority = false, const String &p_description = String());
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bool is_task_completed(TaskID p_task_id) const;
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void wait_for_task_completion(TaskID p_task_id);
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template <class C, class M, class U>
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GroupID add_template_group_task(C *p_instance, M p_method, U p_userdata, int p_elements, int p_tasks = -1, bool p_high_priority = false, const String &p_description = String()) {
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typedef GroupUserData<C, M, U> GUD;
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GUD *ud = memnew(GUD);
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ud->instance = p_instance;
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ud->method = p_method;
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ud->userdata = p_userdata;
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return _add_group_task(Callable(), nullptr, nullptr, ud, p_elements, p_tasks, p_high_priority, p_description);
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}
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GroupID add_native_group_task(void (*p_func)(void *, uint32_t), void *p_userdata, int p_elements, int p_tasks = -1, bool p_high_priority = false, const String &p_description = String());
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GroupID add_group_task(const Callable &p_action, int p_elements, int p_tasks = -1, bool p_high_priority = false, const String &p_description = String());
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uint32_t get_group_processed_element_count(GroupID p_group) const;
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bool is_group_task_completed(GroupID p_group) const;
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void wait_for_group_task_completion(GroupID p_group);
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_FORCE_INLINE_ int get_thread_count() const { return threads.size(); }
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static WorkerThreadPool *get_singleton() { return singleton; }
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void init(int p_thread_count = -1, bool p_use_native_threads_low_priority = true, float p_low_priority_task_ratio = 0.3);
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void finish();
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WorkerThreadPool();
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~WorkerThreadPool();
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};
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#endif // WORKER_THREAD_POOL_H
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