476 lines
14 KiB
C++
476 lines
14 KiB
C++
/**************************************************************************/
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/* message_queue.cpp */
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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) 2014-present Godot Engine contributors (see AUTHORS.md). */
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/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
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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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#include "message_queue.h"
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#include "core/config/project_settings.h"
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#include "core/core_string_names.h"
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#include "core/object/class_db.h"
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#include "core/object/script_language.h"
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void CallQueue::_add_page() {
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if (pages_used == page_messages.size()) {
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pages.push_back(allocator->alloc());
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page_messages.push_back(0);
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}
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page_messages[pages_used] = 0;
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pages_used++;
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page_offset = 0;
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}
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Error CallQueue::push_callp(ObjectID p_id, const StringName &p_method, const Variant **p_args, int p_argcount, bool p_show_error) {
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return push_callablep(Callable(p_id, p_method), p_args, p_argcount, p_show_error);
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}
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Error CallQueue::push_callp(Object *p_object, const StringName &p_method, const Variant **p_args, int p_argcount, bool p_show_error) {
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return push_callp(p_object->get_instance_id(), p_method, p_args, p_argcount, p_show_error);
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}
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Error CallQueue::push_notification(Object *p_object, int p_notification) {
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return push_notification(p_object->get_instance_id(), p_notification);
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}
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Error CallQueue::push_set(Object *p_object, const StringName &p_prop, const Variant &p_value) {
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return push_set(p_object->get_instance_id(), p_prop, p_value);
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}
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Error CallQueue::push_callablep(const Callable &p_callable, const Variant **p_args, int p_argcount, bool p_show_error) {
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mutex.lock();
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uint32_t room_needed = sizeof(Message) + sizeof(Variant) * p_argcount;
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ERR_FAIL_COND_V_MSG(room_needed > uint32_t(PAGE_SIZE_BYTES), ERR_INVALID_PARAMETER, "Message is too large to fit on a page (" + itos(PAGE_SIZE_BYTES) + " bytes), consider passing less arguments.");
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_ensure_first_page();
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if ((page_offset + room_needed) > uint32_t(PAGE_SIZE_BYTES)) {
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if (room_needed > uint32_t(PAGE_SIZE_BYTES) || pages_used == max_pages) {
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ERR_PRINT("Failed method: " + p_callable + ". Message queue out of memory. " + error_text);
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statistics();
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mutex.unlock();
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return ERR_OUT_OF_MEMORY;
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}
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_add_page();
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}
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Page *page = pages[pages_used - 1];
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uint8_t *buffer_end = &page->data[page_offset];
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Message *msg = memnew_placement(buffer_end, Message);
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msg->args = p_argcount;
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msg->callable = p_callable;
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msg->type = TYPE_CALL;
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if (p_show_error) {
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msg->type |= FLAG_SHOW_ERROR;
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}
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// Support callables of static methods.
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if (p_callable.get_object_id().is_null() && p_callable.is_valid()) {
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msg->type |= FLAG_NULL_IS_OK;
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}
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buffer_end += sizeof(Message);
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for (int i = 0; i < p_argcount; i++) {
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Variant *v = memnew_placement(buffer_end, Variant);
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buffer_end += sizeof(Variant);
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*v = *p_args[i];
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}
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page_messages[pages_used - 1]++;
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page_offset += room_needed;
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mutex.unlock();
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return OK;
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}
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Error CallQueue::push_set(ObjectID p_id, const StringName &p_prop, const Variant &p_value) {
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mutex.lock();
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uint32_t room_needed = sizeof(Message) + sizeof(Variant);
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_ensure_first_page();
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if ((page_offset + room_needed) > uint32_t(PAGE_SIZE_BYTES)) {
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if (pages_used == max_pages) {
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String type;
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if (ObjectDB::get_instance(p_id)) {
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type = ObjectDB::get_instance(p_id)->get_class();
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}
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ERR_PRINT("Failed set: " + type + ":" + p_prop + " target ID: " + itos(p_id) + ". Message queue out of memory. " + error_text);
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statistics();
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mutex.unlock();
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return ERR_OUT_OF_MEMORY;
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}
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_add_page();
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}
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Page *page = pages[pages_used - 1];
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uint8_t *buffer_end = &page->data[page_offset];
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Message *msg = memnew_placement(buffer_end, Message);
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msg->args = 1;
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msg->callable = Callable(p_id, p_prop);
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msg->type = TYPE_SET;
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buffer_end += sizeof(Message);
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Variant *v = memnew_placement(buffer_end, Variant);
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*v = p_value;
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page_messages[pages_used - 1]++;
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page_offset += room_needed;
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mutex.unlock();
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return OK;
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}
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Error CallQueue::push_notification(ObjectID p_id, int p_notification) {
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ERR_FAIL_COND_V(p_notification < 0, ERR_INVALID_PARAMETER);
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mutex.lock();
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uint32_t room_needed = sizeof(Message);
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_ensure_first_page();
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if ((page_offset + room_needed) > uint32_t(PAGE_SIZE_BYTES)) {
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if (pages_used == max_pages) {
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ERR_PRINT("Failed notification: " + itos(p_notification) + " target ID: " + itos(p_id) + ". Message queue out of memory. " + error_text);
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statistics();
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mutex.unlock();
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return ERR_OUT_OF_MEMORY;
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}
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_add_page();
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}
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Page *page = pages[pages_used - 1];
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uint8_t *buffer_end = &page->data[page_offset];
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Message *msg = memnew_placement(buffer_end, Message);
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msg->type = TYPE_NOTIFICATION;
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msg->callable = Callable(p_id, CoreStringNames::get_singleton()->notification); //name is meaningless but callable needs it
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//msg->target;
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msg->notification = p_notification;
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page_messages[pages_used - 1]++;
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page_offset += room_needed;
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mutex.unlock();
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return OK;
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}
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void CallQueue::_call_function(const Callable &p_callable, const Variant *p_args, int p_argcount, bool p_show_error) {
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const Variant **argptrs = nullptr;
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if (p_argcount) {
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argptrs = (const Variant **)alloca(sizeof(Variant *) * p_argcount);
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for (int i = 0; i < p_argcount; i++) {
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argptrs[i] = &p_args[i];
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}
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}
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Callable::CallError ce;
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Variant ret;
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p_callable.callp(argptrs, p_argcount, ret, ce);
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if (p_show_error && ce.error != Callable::CallError::CALL_OK) {
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ERR_PRINT("Error calling deferred method: " + Variant::get_callable_error_text(p_callable, argptrs, p_argcount, ce) + ".");
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}
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}
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Error CallQueue::flush() {
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mutex.lock();
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if (pages.size() == 0) {
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// Never allocated
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mutex.unlock();
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return OK; // Do nothing.
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}
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if (flushing) {
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mutex.unlock();
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return ERR_BUSY;
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}
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flushing = true;
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uint32_t i = 0;
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uint32_t j = 0;
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uint32_t offset = 0;
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while (i < pages_used && j < page_messages[i]) {
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Page *page = pages[i];
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//lock on each iteration, so a call can re-add itself to the message queue
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Message *message = (Message *)&page->data[offset];
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uint32_t advance = sizeof(Message);
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if ((message->type & FLAG_MASK) != TYPE_NOTIFICATION) {
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advance += sizeof(Variant) * message->args;
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}
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//pre-advance so this function is reentrant
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offset += advance;
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Object *target = message->callable.get_object();
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mutex.unlock();
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switch (message->type & FLAG_MASK) {
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case TYPE_CALL: {
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if (target || (message->type & FLAG_NULL_IS_OK)) {
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Variant *args = (Variant *)(message + 1);
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_call_function(message->callable, args, message->args, message->type & FLAG_SHOW_ERROR);
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}
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} break;
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case TYPE_NOTIFICATION: {
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if (target) {
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target->notification(message->notification);
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}
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} break;
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case TYPE_SET: {
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if (target) {
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Variant *arg = (Variant *)(message + 1);
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target->set(message->callable.get_method(), *arg);
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}
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} break;
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}
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if ((message->type & FLAG_MASK) != TYPE_NOTIFICATION) {
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Variant *args = (Variant *)(message + 1);
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for (int k = 0; k < message->args; k++) {
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args[k].~Variant();
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}
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}
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message->~Message();
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mutex.lock();
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j++;
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if (j == page_messages[i]) {
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j = 0;
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i++;
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offset = 0;
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}
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}
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page_messages[0] = 0;
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page_offset = 0;
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pages_used = 1;
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flushing = false;
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mutex.unlock();
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return OK;
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}
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void CallQueue::clear() {
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mutex.lock();
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if (pages.size() == 0) {
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mutex.unlock();
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return; // Nothing to clear.
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}
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for (uint32_t i = 0; i < pages_used; i++) {
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uint32_t offset = 0;
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for (uint32_t j = 0; j < page_messages[i]; j++) {
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Page *page = pages[i];
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//lock on each iteration, so a call can re-add itself to the message queue
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Message *message = (Message *)&page->data[offset];
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uint32_t advance = sizeof(Message);
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if ((message->type & FLAG_MASK) != TYPE_NOTIFICATION) {
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advance += sizeof(Variant) * message->args;
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}
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//pre-advance so this function is reentrant
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offset += advance;
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if ((message->type & FLAG_MASK) != TYPE_NOTIFICATION) {
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Variant *args = (Variant *)(message + 1);
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for (int k = 0; k < message->args; k++) {
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args[k].~Variant();
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}
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}
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message->~Message();
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}
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}
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pages_used = 1;
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page_offset = 0;
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page_messages[0] = 0;
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mutex.unlock();
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}
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void CallQueue::statistics() {
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mutex.lock();
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HashMap<StringName, int> set_count;
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HashMap<int, int> notify_count;
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HashMap<Callable, int> call_count;
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int null_count = 0;
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for (uint32_t i = 0; i < pages_used; i++) {
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uint32_t offset = 0;
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for (uint32_t j = 0; j < page_messages[i]; j++) {
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Page *page = pages[i];
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//lock on each iteration, so a call can re-add itself to the message queue
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Message *message = (Message *)&page->data[offset];
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uint32_t advance = sizeof(Message);
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if ((message->type & FLAG_MASK) != TYPE_NOTIFICATION) {
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advance += sizeof(Variant) * message->args;
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}
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Object *target = message->callable.get_object();
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bool null_target = true;
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switch (message->type & FLAG_MASK) {
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case TYPE_CALL: {
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if (target || (message->type & FLAG_NULL_IS_OK)) {
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if (!call_count.has(message->callable)) {
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call_count[message->callable] = 0;
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}
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call_count[message->callable]++;
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null_target = false;
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}
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} break;
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case TYPE_NOTIFICATION: {
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if (target) {
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if (!notify_count.has(message->notification)) {
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notify_count[message->notification] = 0;
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}
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notify_count[message->notification]++;
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null_target = false;
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}
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} break;
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case TYPE_SET: {
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if (target) {
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StringName t = message->callable.get_method();
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if (!set_count.has(t)) {
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set_count[t] = 0;
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}
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set_count[t]++;
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null_target = false;
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}
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} break;
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}
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if (null_target) {
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//object was deleted
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print_line("Object was deleted while awaiting a callback");
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null_count++;
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}
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//pre-advance so this function is reentrant
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offset += advance;
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if ((message->type & FLAG_MASK) != TYPE_NOTIFICATION) {
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Variant *args = (Variant *)(message + 1);
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for (int k = 0; k < message->args; k++) {
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args[k].~Variant();
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}
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}
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message->~Message();
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}
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}
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print_line("TOTAL PAGES: " + itos(pages_used) + " (" + itos(pages_used * PAGE_SIZE_BYTES) + " bytes).");
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print_line("NULL count: " + itos(null_count));
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for (const KeyValue<StringName, int> &E : set_count) {
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print_line("SET " + E.key + ": " + itos(E.value));
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}
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for (const KeyValue<Callable, int> &E : call_count) {
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print_line("CALL " + E.key + ": " + itos(E.value));
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}
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for (const KeyValue<int, int> &E : notify_count) {
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print_line("NOTIFY " + itos(E.key) + ": " + itos(E.value));
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}
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mutex.unlock();
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}
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bool CallQueue::is_flushing() const {
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return flushing;
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}
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int CallQueue::get_max_buffer_usage() const {
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return pages.size() * PAGE_SIZE_BYTES;
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}
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CallQueue::CallQueue(Allocator *p_custom_allocator, uint32_t p_max_pages, const String &p_error_text) {
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if (p_custom_allocator) {
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allocator = p_custom_allocator;
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allocator_is_custom = true;
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} else {
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allocator = memnew(Allocator(16)); // 16 elements per allocator page, 64kb per allocator page. Anything small will do, though.
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allocator_is_custom = false;
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}
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max_pages = p_max_pages;
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error_text = p_error_text;
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}
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CallQueue::~CallQueue() {
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clear();
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// Let go of pages.
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for (uint32_t i = 0; i < pages.size(); i++) {
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allocator->free(pages[i]);
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}
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if (!allocator_is_custom) {
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memdelete(allocator);
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}
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}
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//////////////////////
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MessageQueue *MessageQueue::singleton = nullptr;
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MessageQueue::MessageQueue() :
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CallQueue(nullptr,
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int(GLOBAL_DEF_RST(PropertyInfo(Variant::INT, "memory/limits/message_queue/max_size_mb", PROPERTY_HINT_RANGE, "1,512,1,or_greater"), 32)) * 1024 * 1024 / PAGE_SIZE_BYTES,
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"Message queue out of memory. Try increasing 'memory/limits/message_queue/max_size_mb' in project settings.") {
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ERR_FAIL_COND_MSG(singleton != nullptr, "A MessageQueue singleton already exists.");
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singleton = this;
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}
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MessageQueue::~MessageQueue() {
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singleton = nullptr;
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}
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