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Merge pull request #4289 from wwylele/sdl-twice-twice 

input/sdl: lock map mutex after SDL call
This commit is contained in:
Weiyi Wang 2018-10-05 10:54:45 -04:00 committed by GitHub
parent 2a90426cb8 22df17c303
commit 794498c33e
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 17 additions and 11 deletions
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28
src/input_common/sdl/sdl_impl.cpp
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@ -159,9 +159,9 @@ std::shared_ptr<SDLJoystick> SDLState::GetSDLJoystickByGUID(const std::string& g
* it to a SDLJoystick with the same guid and that port * it to a SDLJoystick with the same guid and that port
*/ */
std::shared_ptr<SDLJoystick> SDLState::GetSDLJoystickBySDLID(SDL_JoystickID sdl_id) { std::shared_ptr<SDLJoystick> SDLState::GetSDLJoystickBySDLID(SDL_JoystickID sdl_id) {
std::lock_guard<std::mutex> lock(joystick_map_mutex);
auto sdl_joystick = SDL_JoystickFromInstanceID(sdl_id); auto sdl_joystick = SDL_JoystickFromInstanceID(sdl_id);
const std::string guid = GetGUID(sdl_joystick); const std::string guid = GetGUID(sdl_joystick);
std::lock_guard<std::mutex> lock(joystick_map_mutex);
auto map_it = joystick_map.find(guid); auto map_it = joystick_map.find(guid);
if (map_it != joystick_map.end()) { if (map_it != joystick_map.end()) {
auto vec_it = std::find_if(map_it->second.begin(), map_it->second.end(), auto vec_it = std::find_if(map_it->second.begin(), map_it->second.end(),
@ -193,13 +193,13 @@ std::shared_ptr<SDLJoystick> SDLState::GetSDLJoystickBySDLID(SDL_JoystickID sdl_
} }
void SDLState::InitJoystick(int joystick_index) { void SDLState::InitJoystick(int joystick_index) {
std::lock_guard<std::mutex> lock(joystick_map_mutex);
SDL_Joystick* sdl_joystick = SDL_JoystickOpen(joystick_index); SDL_Joystick* sdl_joystick = SDL_JoystickOpen(joystick_index);
if (!sdl_joystick) { if (!sdl_joystick) {
LOG_ERROR(Input, "failed to open joystick {}", joystick_index); LOG_ERROR(Input, "failed to open joystick {}", joystick_index);
return; return;
} }
std::string guid = GetGUID(sdl_joystick); std::string guid = GetGUID(sdl_joystick);
std::lock_guard<std::mutex> lock(joystick_map_mutex);
if (joystick_map.find(guid) == joystick_map.end()) { if (joystick_map.find(guid) == joystick_map.end()) {
auto joystick = std::make_shared<SDLJoystick>(guid, 0, sdl_joystick); auto joystick = std::make_shared<SDLJoystick>(guid, 0, sdl_joystick);
joystick_map[guid].emplace_back(std::move(joystick)); joystick_map[guid].emplace_back(std::move(joystick));
@ -218,16 +218,22 @@ void SDLState::InitJoystick(int joystick_index) {
} }
void SDLState::CloseJoystick(SDL_Joystick* sdl_joystick) { void SDLState::CloseJoystick(SDL_Joystick* sdl_joystick) {
std::lock_guard<std::mutex> lock(joystick_map_mutex);
std::string guid = GetGUID(sdl_joystick); std::string guid = GetGUID(sdl_joystick);
// This call to guid is safe since the joystick is guaranteed to be in the map std::shared_ptr<SDLJoystick> joystick;
auto& joystick_guid_list = joystick_map[guid]; {
const auto joystick_it = std::lock_guard<std::mutex> lock(joystick_map_mutex);
std::find_if(joystick_guid_list.begin(), joystick_guid_list.end(), // This call to guid is safe since the joystick is guaranteed to be in the map
[&sdl_joystick](const std::shared_ptr<SDLJoystick>& joystick) { auto& joystick_guid_list = joystick_map[guid];
return joystick->GetSDLJoystick() == sdl_joystick; const auto joystick_it =
}); std::find_if(joystick_guid_list.begin(), joystick_guid_list.end(),
(*joystick_it)->SetSDLJoystick(nullptr, [](SDL_Joystick*) {}); [&sdl_joystick](const std::shared_ptr<SDLJoystick>& joystick) {
return joystick->GetSDLJoystick() == sdl_joystick;
});
joystick = *joystick_it;
}
// Destruct SDL_Joystick outside the lock guard because SDL can internally call event calback
// which locks the mutex again
joystick->SetSDLJoystick(nullptr, [](SDL_Joystick*) {});
} }
void SDLState::HandleGameControllerEvent(const SDL_Event& event) { void SDLState::HandleGameControllerEvent(const SDL_Event& event) {