mirror of
https://github.com/godotengine/godot.git
synced 2025-10-31 13:41:03 +00:00
244 lines
8.9 KiB
C++
244 lines
8.9 KiB
C++
/**************************************************************************/
|
|
/* worker_thread_pool.h */
|
|
/**************************************************************************/
|
|
/* This file is part of: */
|
|
/* GODOT ENGINE */
|
|
/* https://godotengine.org */
|
|
/**************************************************************************/
|
|
/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
|
|
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
|
|
/* */
|
|
/* Permission is hereby granted, free of charge, to any person obtaining */
|
|
/* a copy of this software and associated documentation files (the */
|
|
/* "Software"), to deal in the Software without restriction, including */
|
|
/* without limitation the rights to use, copy, modify, merge, publish, */
|
|
/* distribute, sublicense, and/or sell copies of the Software, and to */
|
|
/* permit persons to whom the Software is furnished to do so, subject to */
|
|
/* the following conditions: */
|
|
/* */
|
|
/* The above copyright notice and this permission notice shall be */
|
|
/* included in all copies or substantial portions of the Software. */
|
|
/* */
|
|
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
|
|
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
|
|
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
|
|
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
|
|
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
|
|
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
|
|
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
|
|
/**************************************************************************/
|
|
|
|
#ifndef WORKER_THREAD_POOL_H
|
|
#define WORKER_THREAD_POOL_H
|
|
|
|
#include "core/os/condition_variable.h"
|
|
#include "core/os/memory.h"
|
|
#include "core/os/os.h"
|
|
#include "core/os/semaphore.h"
|
|
#include "core/os/thread.h"
|
|
#include "core/templates/local_vector.h"
|
|
#include "core/templates/paged_allocator.h"
|
|
#include "core/templates/rid.h"
|
|
#include "core/templates/safe_refcount.h"
|
|
|
|
class CommandQueueMT;
|
|
|
|
class WorkerThreadPool : public Object {
|
|
GDCLASS(WorkerThreadPool, Object)
|
|
public:
|
|
enum {
|
|
INVALID_TASK_ID = -1
|
|
};
|
|
|
|
typedef int64_t TaskID;
|
|
typedef int64_t GroupID;
|
|
|
|
private:
|
|
struct Task;
|
|
|
|
struct BaseTemplateUserdata {
|
|
virtual void callback() {}
|
|
virtual void callback_indexed(uint32_t p_index) {}
|
|
virtual ~BaseTemplateUserdata() {}
|
|
};
|
|
|
|
struct Group {
|
|
GroupID self = -1;
|
|
SafeNumeric<uint32_t> index;
|
|
SafeNumeric<uint32_t> completed_index;
|
|
uint32_t max = 0;
|
|
Semaphore done_semaphore;
|
|
SafeFlag completed;
|
|
SafeNumeric<uint32_t> finished;
|
|
uint32_t tasks_used = 0;
|
|
};
|
|
|
|
struct Task {
|
|
TaskID self = -1;
|
|
Callable callable;
|
|
void (*native_func)(void *) = nullptr;
|
|
void (*native_group_func)(void *, uint32_t) = nullptr;
|
|
void *native_func_userdata = nullptr;
|
|
String description;
|
|
Semaphore done_semaphore; // For user threads awaiting.
|
|
bool completed : 1;
|
|
bool pending_notify_yield_over : 1;
|
|
Group *group = nullptr;
|
|
SelfList<Task> task_elem;
|
|
uint32_t waiting_pool = 0;
|
|
uint32_t waiting_user = 0;
|
|
bool low_priority = false;
|
|
BaseTemplateUserdata *template_userdata = nullptr;
|
|
int pool_thread_index = -1;
|
|
|
|
void free_template_userdata();
|
|
Task() :
|
|
completed(false),
|
|
pending_notify_yield_over(false),
|
|
task_elem(this) {}
|
|
};
|
|
|
|
static const uint32_t TASKS_PAGE_SIZE = 1024;
|
|
static const uint32_t GROUPS_PAGE_SIZE = 256;
|
|
|
|
PagedAllocator<Task, false, TASKS_PAGE_SIZE> task_allocator;
|
|
PagedAllocator<Group, false, GROUPS_PAGE_SIZE> group_allocator;
|
|
|
|
SelfList<Task>::List low_priority_task_queue;
|
|
SelfList<Task>::List task_queue;
|
|
|
|
BinaryMutex task_mutex;
|
|
|
|
struct ThreadData {
|
|
static Task *const YIELDING; // Too bad constexpr doesn't work here.
|
|
|
|
uint32_t index = 0;
|
|
Thread thread;
|
|
bool ready_for_scripting : 1;
|
|
bool signaled : 1;
|
|
bool yield_is_over : 1;
|
|
Task *current_task = nullptr;
|
|
Task *awaited_task = nullptr; // Null if not awaiting the condition variable, or special value (YIELDING).
|
|
ConditionVariable cond_var;
|
|
|
|
ThreadData() :
|
|
ready_for_scripting(false),
|
|
signaled(false),
|
|
yield_is_over(false) {}
|
|
};
|
|
|
|
TightLocalVector<ThreadData> threads;
|
|
bool exit_threads = false;
|
|
|
|
HashMap<Thread::ID, int> thread_ids;
|
|
HashMap<
|
|
TaskID,
|
|
Task *,
|
|
HashMapHasherDefault,
|
|
HashMapComparatorDefault<TaskID>,
|
|
PagedAllocator<HashMapElement<TaskID, Task *>, false, TASKS_PAGE_SIZE>>
|
|
tasks;
|
|
HashMap<
|
|
GroupID,
|
|
Group *,
|
|
HashMapHasherDefault,
|
|
HashMapComparatorDefault<GroupID>,
|
|
PagedAllocator<HashMapElement<GroupID, Group *>, false, GROUPS_PAGE_SIZE>>
|
|
groups;
|
|
|
|
uint32_t max_low_priority_threads = 0;
|
|
uint32_t low_priority_threads_used = 0;
|
|
uint32_t notify_index = 0; // For rotating across threads, no help distributing load.
|
|
|
|
uint64_t last_task = 1;
|
|
|
|
static void _thread_function(void *p_user);
|
|
|
|
void _process_task(Task *task);
|
|
|
|
void _post_tasks_and_unlock(Task **p_tasks, uint32_t p_count, bool p_high_priority);
|
|
void _notify_threads(const ThreadData *p_current_thread_data, uint32_t p_process_count, uint32_t p_promote_count);
|
|
|
|
bool _try_promote_low_priority_task();
|
|
|
|
static WorkerThreadPool *singleton;
|
|
|
|
static thread_local CommandQueueMT *flushing_cmd_queue;
|
|
|
|
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);
|
|
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);
|
|
|
|
template <typename C, typename M, typename U>
|
|
struct TaskUserData : public BaseTemplateUserdata {
|
|
C *instance;
|
|
M method;
|
|
U userdata;
|
|
virtual void callback() override {
|
|
(instance->*method)(userdata);
|
|
}
|
|
};
|
|
|
|
template <typename C, typename M, typename U>
|
|
struct GroupUserData : public BaseTemplateUserdata {
|
|
C *instance;
|
|
M method;
|
|
U userdata;
|
|
virtual void callback_indexed(uint32_t p_index) override {
|
|
(instance->*method)(p_index, userdata);
|
|
}
|
|
};
|
|
|
|
void _wait_collaboratively(ThreadData *p_caller_pool_thread, Task *p_task);
|
|
|
|
protected:
|
|
static void _bind_methods();
|
|
|
|
public:
|
|
template <typename C, typename M, typename U>
|
|
TaskID add_template_task(C *p_instance, M p_method, U p_userdata, bool p_high_priority = false, const String &p_description = String()) {
|
|
typedef TaskUserData<C, M, U> TUD;
|
|
TUD *ud = memnew(TUD);
|
|
ud->instance = p_instance;
|
|
ud->method = p_method;
|
|
ud->userdata = p_userdata;
|
|
return _add_task(Callable(), nullptr, nullptr, ud, p_high_priority, p_description);
|
|
}
|
|
TaskID add_native_task(void (*p_func)(void *), void *p_userdata, bool p_high_priority = false, const String &p_description = String());
|
|
TaskID add_task(const Callable &p_action, bool p_high_priority = false, const String &p_description = String());
|
|
|
|
bool is_task_completed(TaskID p_task_id) const;
|
|
Error wait_for_task_completion(TaskID p_task_id);
|
|
|
|
void yield();
|
|
void notify_yield_over(TaskID p_task_id);
|
|
|
|
template <typename C, typename M, typename U>
|
|
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()) {
|
|
typedef GroupUserData<C, M, U> GroupUD;
|
|
GroupUD *ud = memnew(GroupUD);
|
|
ud->instance = p_instance;
|
|
ud->method = p_method;
|
|
ud->userdata = p_userdata;
|
|
return _add_group_task(Callable(), nullptr, nullptr, ud, p_elements, p_tasks, p_high_priority, p_description);
|
|
}
|
|
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());
|
|
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());
|
|
uint32_t get_group_processed_element_count(GroupID p_group) const;
|
|
bool is_group_task_completed(GroupID p_group) const;
|
|
void wait_for_group_task_completion(GroupID p_group);
|
|
|
|
_FORCE_INLINE_ int get_thread_count() const { return threads.size(); }
|
|
|
|
static WorkerThreadPool *get_singleton() { return singleton; }
|
|
static int get_thread_index();
|
|
|
|
static void thread_enter_command_queue_mt_flush(CommandQueueMT *p_queue);
|
|
static void thread_exit_command_queue_mt_flush();
|
|
|
|
void init(int p_thread_count = -1, float p_low_priority_task_ratio = 0.3);
|
|
void finish();
|
|
WorkerThreadPool();
|
|
~WorkerThreadPool();
|
|
};
|
|
|
|
#endif // WORKER_THREAD_POOL_H
|