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/**************************************************************************/
/* thread.cpp */
/**************************************************************************/
/* 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. */
/**************************************************************************/
#include "platform_config.h"
#ifndef PLATFORM_THREAD_OVERRIDE // See details in thread.h
#include "thread.h"
#include "core/script_language.h"
#if !defined(NO_THREADS)
#include "core/safe_refcount.h"
Error (*Thread::set_name_func)(const String &) = nullptr;
void (*Thread::set_priority_func)(Thread::Priority) = nullptr;
void (*Thread::init_func)() = nullptr;
void (*Thread::term_func)() = nullptr;
uint64_t Thread::_thread_id_hash(const std::thread::id &p_t) {
static std::hash<std::thread::id> hasher;
return hasher(p_t);
}
Thread::ID Thread::main_thread_id = _thread_id_hash(std::this_thread::get_id());
static thread_local Thread::ID caller_id = 0;
static thread_local bool caller_id_cached = false;
void Thread::_set_platform_funcs(
Error (*p_set_name_func)(const String &),
void (*p_set_priority_func)(Thread::Priority),
void (*p_init_func)(),
void (*p_term_func)()) {
Thread::set_name_func = p_set_name_func;
Thread::set_priority_func = p_set_priority_func;
Thread::init_func = p_init_func;
Thread::term_func = p_term_func;
}
void Thread::callback(Thread *p_self, const Settings &p_settings, Callback p_callback, void *p_userdata) {
caller_id = _thread_id_hash(p_self->thread.get_id());
caller_id_cached = true;
if (set_priority_func) {
set_priority_func(p_settings.priority);
}
if (init_func) {
init_func();
}
ScriptServer::thread_enter(); //scripts may need to attach a stack
p_callback(p_userdata);
ScriptServer::thread_exit();
if (term_func) {
term_func();
}
}
void Thread::start(Thread::Callback p_callback, void *p_user, const Settings &p_settings) {
if (id != _thread_id_hash(std::thread::id())) {
#ifdef DEBUG_ENABLED
WARN_PRINT("A Thread object has been re-started without wait_to_finish() having been called on it. Please do so to ensure correct cleanup of the thread.");
#endif
thread.detach();
std::thread empty_thread;
thread.swap(empty_thread);
}
std::thread new_thread(&Thread::callback, this, p_settings, p_callback, p_user);
thread.swap(new_thread);
id = _thread_id_hash(thread.get_id());
}
bool Thread::is_started() const {
return id != _thread_id_hash(std::thread::id());
}
void Thread::wait_to_finish() {
if (id != _thread_id_hash(std::thread::id())) {
ERR_FAIL_COND_MSG(id == get_caller_id(), "A Thread can't wait for itself to finish.");
thread.join();
std::thread empty_thread;
thread.swap(empty_thread);
id = _thread_id_hash(std::thread::id());
}
}
Error Thread::set_name(const String &p_name) {
if (set_name_func) {
return set_name_func(p_name);
}
return ERR_UNAVAILABLE;
}
Thread::~Thread() {
if (id != _thread_id_hash(std::thread::id())) {
#ifdef DEBUG_ENABLED
WARN_PRINT(
"A Thread object is being destroyed without its completion having been realized.\n"
"Please call wait_to_finish() on it to ensure correct cleanup.");
#endif
thread.detach();
}
}
Thread::ID Thread::get_caller_id() {
if (likely(caller_id_cached)) {
return caller_id;
} else {
caller_id = _thread_id_hash(std::this_thread::get_id());
caller_id_cached = true;
return caller_id;
}
}
#endif
#endif // PLATFORM_THREAD_OVERRIDE
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