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Revert "Android: Don't hold gameFileCache lock during updateAdditionalMetadata" 

This reverts commit fb265b610d.

The optimization in that commit is safe when the executor thread is
writing and the GUI thread is reading, but I had failed to take into
account that it's unsafe when the GUI thread is writing and the executor
thread is reading. (The native UpdateAdditionalMetadata function loops
through m_cached_files, which is unsafe if another thread is adding
elements to m_cached_files simultaneously.)

Losing out on this optimization isn't too bad, because
719930bb39 makes it very unlikely that
both threads will want the lock at the same time.
This commit is contained in:
JosJuice 2022-09-27 18:57:42 +02:00
parent 481df6b660
commit 51debaeb47
4 changed files with 15 additions and 21 deletions
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5
Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/services/GameFileCacheManager.java
View File

@ -227,11 +227,9 @@ public final class GameFileCacheManager
{
String[] gamePaths = GameFileCache.getAllGamePaths();
boolean changed;
synchronized (sGameFileCache)
{
changed = sGameFileCache.update(gamePaths);
}
boolean changed = sGameFileCache.update(gamePaths);
if (changed)
{
updateGameFileArray();
@ -248,6 +246,7 @@ public final class GameFileCacheManager
sGameFileCache.save();
}
}
}
sRescanInProgress.postValue(false);
}

2
Source/CMakeLists.txt
View File

@ -13,8 +13,6 @@ if(CMAKE_SYSTEM_NAME MATCHES "Windows")
add_definitions(-D_CRT_SECURE_NO_DEPRECATE)
add_definitions(-D_CRT_NONSTDC_NO_WARNINGS)
add_definitions(-D_SILENCE_CXX17_CODECVT_HEADER_DEPRECATION_WARNING)
# The replacement for the old atomic shared_ptr functions was added in C++20, so we can't use it yet
add_definitions(-D_SILENCE_CXX20_OLD_SHARED_PTR_ATOMIC_SUPPORT_DEPRECATION_WARNING)
endif()
if (NOT MSVC)

3
Source/Core/UICommon/GameFileCache.cpp
View File

@ -4,7 +4,6 @@
#include "UICommon/GameFileCache.h"
#include <algorithm>
#include <atomic>
#include <cstddef>
#include <functional>
#include <list>
@ -204,7 +203,7 @@ bool GameFileCache::UpdateAdditionalMetadata(std::shared_ptr<GameFile>* game_fil
if (custom_cover_changed)
copy->CustomCoverCommit();
std::atomic_store(game_file, std::move(copy));
*game_file = std::move(copy);
return true;
}

2
Source/VSProps/Base.Dolphin.props
View File

@ -29,8 +29,6 @@
<PreprocessorDefinitions>_WINSOCK_DEPRECATED_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<!--Currently needed for some code in StringUtil used only on Android-->
<PreprocessorDefinitions>_SILENCE_CXX17_CODECVT_HEADER_DEPRECATION_WARNING;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<!--The replacement for the old atomic shared_ptr functions was added in C++20, so we can't use it yet-->
<PreprocessorDefinitions>_SILENCE_CXX20_OLD_SHARED_PTR_ATOMIC_SUPPORT_DEPRECATION_WARNING;%(PreprocessorDefinitions)</PreprocessorDefinitions>
<!--Dolphin-specific definitions-->
<PreprocessorDefinitions Condition="'$(Platform)'=='x64'">_ARCH_64=1;_M_X86=1;_M_X86_64=1;%(PreprocessorDefinitions)</PreprocessorDefinitions>