godot/core/os/thread.h
Pedro J. Estébanez 99fe462452 Modernize Thread
- Based on C++11's `thread` and `thread_local`
- No more need to allocate-deallocate or check for null
- No pointer anymore, just a member variable
- Platform-specific implementations no longer needed (except for the few cases of non-portable functions)
- Simpler for `NO_THREADS`
- Thread ids are now the same across platforms (main is 1; others follow)
2021-01-29 12:02:13 +01:00

116 lines
4.2 KiB
C++

/*************************************************************************/
/* thread.h */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md). */
/* */
/* 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 THREAD_H
#define THREAD_H
#include "core/typedefs.h"
#if !defined(NO_THREADS)
#include <thread>
#endif
class String;
class Thread {
public:
typedef void (*Callback)(void *p_userdata);
typedef uint64_t ID;
enum Priority {
PRIORITY_LOW,
PRIORITY_NORMAL,
PRIORITY_HIGH
};
struct Settings {
Priority priority;
Settings() { priority = PRIORITY_NORMAL; }
};
private:
#if !defined(NO_THREADS)
friend class Main;
static ID main_thread_id;
static ID last_thread_id;
ID id = 0;
static thread_local ID caller_id;
std::thread thread;
static void callback(Thread *p_self, const Settings &p_settings, Thread::Callback p_callback, void *p_userdata);
static Error (*set_name_func)(const String &);
static void (*set_priority_func)(Thread::Priority);
static void (*init_func)();
static void (*term_func)();
#endif
public:
static void _set_platform_funcs(
Error (*p_set_name_func)(const String &),
void (*p_set_priority_func)(Thread::Priority),
void (*p_init_func)() = nullptr,
void (*p_term_func)() = nullptr);
#if !defined(NO_THREADS)
_FORCE_INLINE_ ID get_id() const { return id; }
// get the ID of the caller thread
_FORCE_INLINE_ static ID get_caller_id() { return caller_id; }
// get the ID of the main thread
_FORCE_INLINE_ static ID get_main_id() { return main_thread_id; }
static Error set_name(const String &p_name);
void start(Thread::Callback p_callback, void *p_user, const Settings &p_settings = Settings());
bool is_started() const;
///< waits until thread is finished, and deallocates it.
void wait_to_finish();
~Thread();
#else
_FORCE_INLINE_ ID get_id() const { return 0; }
// get the ID of the caller thread
_FORCE_INLINE_ static ID get_caller_id() { return 0; }
// get the ID of the main thread
_FORCE_INLINE_ static ID get_main_id() { return 0; }
static Error set_name(const String &p_name) { return ERR_UNAVAILABLE; }
void start(Thread::Callback p_callback, void *p_user, const Settings &p_settings = Settings()) {}
bool is_started() const { return false; }
void wait_to_finish() {}
#endif
};
#endif // THREAD_H