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Fixup thread-owned lambda bookkeeping on thread exit (take 2)

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This commit is contained in:
Pedro J. Estébanez
2023-11-22 23:20:49 +01:00
parent f26328e9a3
commit bfe66ab7cd
3 changed files with 129 additions and 17 deletions
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87
modules/gdscript/gdscript.cpp
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@@ -1391,36 +1391,54 @@ String GDScript::debug_get_script_name(const Ref<Script> &p_script) {
}
#endif
thread_local GDScript::UpdatableFuncPtr GDScript::func_ptrs_to_update_thread_local;
GDScript::UpdatableFuncPtr GDScript::func_ptrs_to_update_main_thread;
thread_local GDScript::UpdatableFuncPtr *GDScript::func_ptrs_to_update_thread_local = nullptr;
GDScript::UpdatableFuncPtrElement GDScript::_add_func_ptr_to_update(GDScriptFunction **p_func_ptr_ptr) {
UpdatableFuncPtrElement result = {};
{
MutexLock lock(func_ptrs_to_update_thread_local.mutex);
result.element = func_ptrs_to_update_thread_local.ptrs.push_back(p_func_ptr_ptr);
result.mutex = &func_ptrs_to_update_thread_local.mutex;
MutexLock lock(func_ptrs_to_update_thread_local->mutex);
result.element = func_ptrs_to_update_thread_local->ptrs.push_back(p_func_ptr_ptr);
result.func_ptr = func_ptrs_to_update_thread_local;
if (likely(func_ptrs_to_update_thread_local.initialized)) {
if (likely(func_ptrs_to_update_thread_local->initialized)) {
return result;
}
func_ptrs_to_update_thread_local.initialized = true;
func_ptrs_to_update_thread_local->initialized = true;
}
MutexLock lock(func_ptrs_to_update_mutex);
func_ptrs_to_update.push_back(&func_ptrs_to_update_thread_local);
func_ptrs_to_update.push_back(func_ptrs_to_update_thread_local);
func_ptrs_to_update_thread_local->rc++;
return result;
}
void GDScript::_remove_func_ptr_to_update(const UpdatableFuncPtrElement p_func_ptr_element) {
void GDScript::_remove_func_ptr_to_update(const UpdatableFuncPtrElement &p_func_ptr_element) {
ERR_FAIL_NULL(p_func_ptr_element.element);
ERR_FAIL_NULL(p_func_ptr_element.mutex);
MutexLock lock(*p_func_ptr_element.mutex);
ERR_FAIL_NULL(p_func_ptr_element.func_ptr);
MutexLock lock(p_func_ptr_element.func_ptr->mutex);
p_func_ptr_element.element->erase();
}
void GDScript::_fixup_thread_function_bookkeeping() {
// Transfer the ownership of these update items to the main thread,
// because the current one is dying, leaving theirs orphan, dangling.
DEV_ASSERT(!Thread::is_main_thread());
MutexLock lock(func_ptrs_to_update_main_thread.mutex);
MutexLock lock2(func_ptrs_to_update_thread_local->mutex);
while (!func_ptrs_to_update_thread_local->ptrs.is_empty()) {
List<GDScriptFunction **>::Element *E = func_ptrs_to_update_thread_local->ptrs.front();
E->transfer_to_back(&func_ptrs_to_update_main_thread.ptrs);
func_ptrs_to_update_thread_local->transferred = true;
}
}
void GDScript::clear(ClearData *p_clear_data) {
if (clearing) {
return;
@@ -1441,9 +1459,27 @@ void GDScript::clear(ClearData *p_clear_data) {
{
MutexLock outer_lock(func_ptrs_to_update_mutex);
for (UpdatableFuncPtr *updatable : func_ptrs_to_update) {
MutexLock inner_lock(updatable->mutex);
for (GDScriptFunction **func_ptr_ptr : updatable->ptrs) {
*func_ptr_ptr = nullptr;
bool destroy = false;
{
MutexLock inner_lock(updatable->mutex);
if (updatable->transferred) {
func_ptrs_to_update_main_thread.mutex.lock();
}
for (GDScriptFunction **func_ptr_ptr : updatable->ptrs) {
*func_ptr_ptr = nullptr;
}
DEV_ASSERT(updatable->rc != 0);
updatable->rc--;
if (updatable->rc == 0) {
destroy = true;
}
if (updatable->transferred) {
func_ptrs_to_update_main_thread.mutex.unlock();
}
}
if (destroy) {
DEV_ASSERT(updatable != &func_ptrs_to_update_main_thread);
memdelete(updatable);
}
}
}
@@ -2065,6 +2101,27 @@ void GDScriptLanguage::remove_named_global_constant(const StringName &p_name) {
named_globals.erase(p_name);
}
void GDScriptLanguage::thread_enter() {
GDScript::func_ptrs_to_update_thread_local = memnew(GDScript::UpdatableFuncPtr);
}
void GDScriptLanguage::thread_exit() {
GDScript::_fixup_thread_function_bookkeeping();
bool destroy = false;
{
MutexLock lock(GDScript::func_ptrs_to_update_thread_local->mutex);
DEV_ASSERT(GDScript::func_ptrs_to_update_thread_local->rc != 0);
GDScript::func_ptrs_to_update_thread_local->rc--;
if (GDScript::func_ptrs_to_update_thread_local->rc == 0) {
destroy = true;
}
}
if (destroy) {
memdelete(GDScript::func_ptrs_to_update_thread_local);
}
}
void GDScriptLanguage::init() {
//populate global constants
int gcc = CoreConstants::get_global_constant_count();
@@ -2097,6 +2154,8 @@ void GDScriptLanguage::init() {
_add_global(E.name, E.ptr);
}
GDScript::func_ptrs_to_update_thread_local = &GDScript::func_ptrs_to_update_main_thread;
#ifdef TESTS_ENABLED
GDScriptTests::GDScriptTestRunner::handle_cmdline();
#endif
@@ -2146,6 +2205,8 @@ void GDScriptLanguage::finish() {
}
script_list.clear();
function_list.clear();
DEV_ASSERT(GDScript::func_ptrs_to_update_main_thread.rc == 1);
}
void GDScriptLanguage::profiling_start() {