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thread_group.hpp
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thread_group.hpp
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/* Copyright (c) 2017-2020 Hans-Kristian Arntzen
*
* 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.
*/
#pragma once
#include <condition_variable>
#include <mutex>
#include <thread>
#include <vector>
#include <queue>
#include <future>
#include <memory>
#include <object_pool.hpp>
#include "variant.hpp"
#include "intrusive.hpp"
#include "timeline_trace_file.hpp"
namespace Granite
{
class ThreadGroup;
struct TaskSignal
{
std::condition_variable cond;
std::mutex lock;
uint64_t counter = 0;
void signal_increment();
void wait_until_at_least(uint64_t count);
};
struct TaskGroup;
namespace Internal
{
struct TaskDeps;
struct Task;
struct TaskDepsDeleter
{
void operator()(TaskDeps *deps);
};
struct TaskGroupDeleter
{
void operator()(TaskGroup *group);
};
struct TaskDeps : Util::IntrusivePtrEnabled<TaskDeps, TaskDepsDeleter, Util::MultiThreadCounter>
{
explicit TaskDeps(ThreadGroup *group_)
: group(group_)
{
count.store(0, std::memory_order_relaxed);
// One implicit dependency is the flush() happening.
dependency_count.store(1, std::memory_order_relaxed);
desc[0] = '\0';
}
ThreadGroup *group;
std::vector<Util::IntrusivePtr<TaskDeps>> pending;
std::atomic_uint count;
std::vector<Task *> pending_tasks;
TaskSignal *signal = nullptr;
std::atomic_uint dependency_count;
void task_completed();
void dependency_satisfied();
void notify_dependees();
std::condition_variable cond;
std::mutex cond_lock;
bool done = false;
char desc[64];
};
using TaskDepsHandle = Util::IntrusivePtr<TaskDeps>;
struct Task
{
Task(TaskDepsHandle deps_, std::function<void ()> func_)
: deps(std::move(deps_)), func(std::move(func_))
{
}
Task() = default;
TaskDepsHandle deps;
std::function<void ()> func;
};
}
struct TaskGroup : Util::IntrusivePtrEnabled<TaskGroup, Internal::TaskGroupDeleter, Util::MultiThreadCounter>
{
explicit TaskGroup(ThreadGroup *group);
~TaskGroup();
void flush();
void wait();
void add_flush_dependency();
void release_flush_dependency();
ThreadGroup *group;
Internal::TaskDepsHandle deps;
void enqueue_task(std::function<void ()> func);
void set_fence_counter_signal(TaskSignal *signal);
ThreadGroup *get_thread_group() const;
void set_desc(const char *desc);
unsigned id = 0;
bool flushed = false;
};
using TaskGroupHandle = Util::IntrusivePtr<TaskGroup>;
class ThreadGroup
{
public:
ThreadGroup();
~ThreadGroup();
ThreadGroup(ThreadGroup &&) = delete;
void operator=(ThreadGroup &&) = delete;
void start(unsigned num_threads);
unsigned get_num_threads() const
{
return unsigned(thread_group.size());
}
void stop();
void enqueue_task(TaskGroup &group, std::function<void ()> func);
TaskGroupHandle create_task(std::function<void ()> func);
TaskGroupHandle create_task();
void move_to_ready_tasks(const std::vector<Internal::Task *> &list);
void add_dependency(TaskGroup &dependee, TaskGroup &dependency);
void free_task_group(TaskGroup *group);
void free_task_deps(Internal::TaskDeps *deps);
void submit(TaskGroupHandle &group);
void wait_idle();
bool is_idle();
Util::TimelineTraceFile *get_timeline_trace_file();
void refresh_global_timeline_trace_file();
private:
Util::ThreadSafeObjectPool<Internal::Task> task_pool;
Util::ThreadSafeObjectPool<TaskGroup> task_group_pool;
Util::ThreadSafeObjectPool<Internal::TaskDeps> task_deps_pool;
std::queue<Internal::Task *> ready_tasks;
std::vector<std::unique_ptr<std::thread>> thread_group;
std::mutex cond_lock;
std::condition_variable cond;
void thread_looper(unsigned self_index);
bool active = false;
bool dead = false;
std::condition_variable wait_cond;
std::mutex wait_cond_lock;
std::atomic_uint total_tasks;
std::atomic_uint completed_tasks;
std::unique_ptr<Util::TimelineTraceFile> timeline_trace_file;
};
}