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Fixed bug 4142 - Concurrency issues in Android backend 

Use a semaphore to prevent concurrency issues between Java Activity and Native thread code, when using 'Android_Window'.
(Eg. Java sending Touch events, while native code is destroying the main SDL_Window. )
This commit is contained in:
Sylvain Becker 2019-01-03 14:18:06 +01:00
parent d11f7615fa
commit cc8f1136b6
5 changed files with 69 additions and 14 deletions
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39
src/core/android/SDL_android.c
View File

@ -322,6 +322,17 @@ JNIEXPORT void JNICALL SDL_JAVA_INTERFACE(nativeSetupJNI)(JNIEnv *mEnv, jclass c
{
__android_log_print(ANDROID_LOG_VERBOSE, "SDL", "nativeSetupJNI()");
/* Use a semaphore to prevent concurrency issues between Java Activity and Native thread code, when using 'Android_Window'.
* (Eg. Java sending Touch events, while native code is destroying the main SDL_Window. )
*/
if (Android_ActivitySem == NULL) {
Android_ActivitySem = SDL_CreateSemaphore(1); /* Could this be created twice if onCreate() is called a second time ? */
}
if (Android_ActivitySem == NULL) {
__android_log_print(ANDROID_LOG_VERBOSE, "SDL", "failed to create Android_ActivitySem semaphore");
}
Android_JNI_SetupThread();
mActivityClass = (jclass)((*mEnv)->NewGlobalRef(mEnv, cls));
@ -558,7 +569,11 @@ JNIEXPORT void JNICALL SDL_JAVA_INTERFACE(onNativeResize)(
jint surfaceWidth, jint surfaceHeight,
jint deviceWidth, jint deviceHeight, jint format, jfloat rate)
{
SDL_SemWait(Android_ActivitySem);
Android_SetScreenResolution(Android_Window, surfaceWidth, surfaceHeight, deviceWidth, deviceHeight, format, rate);
SDL_SemPost(Android_ActivitySem);
}
JNIEXPORT void JNICALL SDL_JAVA_INTERFACE(onNativeOrientationChanged)(
@ -650,6 +665,8 @@ JNIEXPORT jint JNICALL SDL_JAVA_CONTROLLER_INTERFACE(nativeRemoveHaptic)(
/* Surface Created */
JNIEXPORT void JNICALL SDL_JAVA_INTERFACE(onNativeSurfaceChanged)(JNIEnv *env, jclass jcls)
{
SDL_SemWait(Android_ActivitySem);
if (Android_Window && Android_Window->driverdata)
{
SDL_VideoDevice *_this = SDL_GetVideoDevice();
@ -666,11 +683,15 @@ JNIEXPORT void JNICALL SDL_JAVA_INTERFACE(onNativeSurfaceChanged)(JNIEnv *env, j
/* GL Context handling is done in the event loop because this function is run from the Java thread */
}
SDL_SemPost(Android_ActivitySem);
}
/* Surface Destroyed */
JNIEXPORT void JNICALL SDL_JAVA_INTERFACE(onNativeSurfaceDestroyed)(JNIEnv *env, jclass jcls)
{
SDL_SemWait(Android_ActivitySem);
if (Android_Window && Android_Window->driverdata)
{
SDL_VideoDevice *_this = SDL_GetVideoDevice();
@ -689,6 +710,8 @@ JNIEXPORT void JNICALL SDL_JAVA_INTERFACE(onNativeSurfaceDestroyed)(JNIEnv *env,
/* GL Context handling is done in the event loop because this function is run from the Java thread */
}
SDL_SemPost(Android_ActivitySem);
}
/* Keydown */
@ -722,7 +745,11 @@ JNIEXPORT void JNICALL SDL_JAVA_INTERFACE(onNativeTouch)(
jint touch_device_id_in, jint pointer_finger_id_in,
jint action, jfloat x, jfloat y, jfloat p)
{
SDL_SemWait(Android_ActivitySem);
Android_OnTouch(Android_Window, touch_device_id_in, pointer_finger_id_in, action, x, y, p);
SDL_SemPost(Android_ActivitySem);
}
/* Mouse */
@ -730,7 +757,11 @@ JNIEXPORT void JNICALL SDL_JAVA_INTERFACE(onNativeMouse)(
JNIEnv *env, jclass jcls,
jint button, jint action, jfloat x, jfloat y, jboolean relative)
{
SDL_SemWait(Android_ActivitySem);
Android_OnMouse(Android_Window, button, action, x, y, relative);
SDL_SemPost(Android_ActivitySem);
}
/* Accelerometer */
@ -778,6 +809,8 @@ JNIEXPORT void JNICALL SDL_JAVA_INTERFACE(nativeQuit)(
JNIEXPORT void JNICALL SDL_JAVA_INTERFACE(nativePause)(
JNIEnv *env, jclass cls)
{
SDL_SemWait(Android_ActivitySem);
__android_log_print(ANDROID_LOG_VERBOSE, "SDL", "nativePause()");
if (Android_Window) {
@ -790,12 +823,16 @@ JNIEXPORT void JNICALL SDL_JAVA_INTERFACE(nativePause)(
* so the event loop knows to pause and (optionally) block itself */
if (!SDL_SemValue(Android_PauseSem)) SDL_SemPost(Android_PauseSem);
}
SDL_SemPost(Android_ActivitySem);
}
/* Resume */
JNIEXPORT void JNICALL SDL_JAVA_INTERFACE(nativeResume)(
JNIEnv *env, jclass cls)
{
SDL_SemWait(Android_ActivitySem);
__android_log_print(ANDROID_LOG_VERBOSE, "SDL", "nativeResume()");
if (Android_Window) {
@ -816,6 +853,8 @@ JNIEXPORT void JNICALL SDL_JAVA_INTERFACE(nativeResume)(
*/
if (!SDL_SemValue(Android_ResumeSem)) SDL_SemPost(Android_ResumeSem);
}
SDL_SemPost(Android_ActivitySem);
}
JNIEXPORT void JNICALL SDL_JAVA_INTERFACE_INPUT_CONNECTION(nativeCommitText)(

16
src/video/android/SDL_androidevents.c
View File

@ -39,8 +39,8 @@ static void ANDROIDAUDIO_ResumeDevices(void) {}
static void ANDROIDAUDIO_PauseDevices(void) {}
#endif
static void
android_egl_context_restore(SDL_Window *window)
static void
android_egl_context_restore(SDL_Window *window)
{
SDL_Event event;
SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
@ -53,8 +53,8 @@ android_egl_context_restore(SDL_Window *window)
}
}
static void
android_egl_context_backup(SDL_Window *window)
static void
android_egl_context_backup(SDL_Window *window)
{
/* Keep a copy of the EGL Context so we can try to restore it when we resume */
SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
@ -80,7 +80,10 @@ Android_PumpEvents(_THIS)
#if SDL_ANDROID_BLOCK_ON_PAUSE
if (isPaused && !isPausing) {
/* Make sure this is the last thing we do before pausing */
SDL_SemWait(Android_ActivitySem);
android_egl_context_backup(Android_Window);
SDL_SemPost(Android_ActivitySem);
ANDROIDAUDIO_PauseDevices();
if (SDL_SemWait(Android_ResumeSem) == 0) {
#else
@ -91,7 +94,9 @@ Android_PumpEvents(_THIS)
ANDROIDAUDIO_ResumeDevices();
/* Restore the GL Context from here, as this operation is thread dependent */
if (!SDL_HasEvent(SDL_QUIT)) {
SDL_SemWait(Android_ActivitySem);
android_egl_context_restore(Android_Window);
SDL_SemPost(Android_ActivitySem);
}
}
}
@ -110,7 +115,10 @@ Android_PumpEvents(_THIS)
}
#else
if (SDL_SemTryWait(Android_PauseSem) == 0) {
SDL_SemWait(Android_ActivitySem);
android_egl_context_backup(Android_Window);
SDL_SemPost(Android_ActivitySem);
ANDROIDAUDIO_PauseDevices();
isPaused = 1;
}

2
src/video/android/SDL_androidvideo.c
View File

@ -66,7 +66,7 @@ int Android_DeviceHeight = 0;
static Uint32 Android_ScreenFormat = SDL_PIXELFORMAT_UNKNOWN;
static int Android_ScreenRate = 0;
SDL_sem *Android_PauseSem = NULL, *Android_ResumeSem = NULL;
SDL_sem *Android_PauseSem = NULL, *Android_ResumeSem = NULL, *Android_ActivitySem = NULL;
static int
Android_Available(void)

2
src/video/android/SDL_androidvideo.h
View File

@ -41,7 +41,7 @@ extern int Android_SurfaceWidth;
extern int Android_SurfaceHeight;
extern int Android_DeviceWidth;
extern int Android_DeviceHeight;
extern SDL_sem *Android_PauseSem, *Android_ResumeSem;
extern SDL_sem *Android_PauseSem, *Android_ResumeSem, *Android_ActivitySem;
#endif /* SDL_androidvideo_h_ */

24
src/video/android/SDL_androidwindow.c
View File

@ -41,12 +41,14 @@ Android_CreateWindow(_THIS, SDL_Window * window)
{
SDL_WindowData *data;
int retval = 0;
SDL_SemWait(Android_ActivitySem);
if (Android_Window) {
retval = SDL_SetError("Android only supports one window");
goto endfunction;
}
Android_PauseSem = SDL_CreateSemaphore(0);
Android_ResumeSem = SDL_CreateSemaphore(0);
@ -67,15 +69,15 @@ Android_CreateWindow(_THIS, SDL_Window * window)
/* One window, it always has focus */
SDL_SetMouseFocus(window);
SDL_SetKeyboardFocus(window);
data = (SDL_WindowData *) SDL_calloc(1, sizeof(*data));
if (!data) {
retval = SDL_OutOfMemory();
goto endfunction;
}
data->native_window = Android_JNI_GetNativeWindow();
if (!data->native_window) {
SDL_free(data);
retval = SDL_SetError("Could not fetch native window");
@ -99,7 +101,9 @@ Android_CreateWindow(_THIS, SDL_Window * window)
Android_Window = window;
endfunction:
SDL_SemPost(Android_ActivitySem);
return retval;
}
@ -146,14 +150,16 @@ Android_SetWindowFullscreen(_THIS, SDL_Window *window, SDL_VideoDisplay *display
void
Android_DestroyWindow(_THIS, SDL_Window *window)
{
{
SDL_SemWait(Android_ActivitySem);
if (window == Android_Window) {
Android_Window = NULL;
if (Android_PauseSem) SDL_DestroySemaphore(Android_PauseSem);
if (Android_ResumeSem) SDL_DestroySemaphore(Android_ResumeSem);
Android_PauseSem = NULL;
Android_ResumeSem = NULL;
if (window->driverdata) {
SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
if (data->egl_surface != EGL_NO_SURFACE) {
@ -166,6 +172,8 @@ Android_DestroyWindow(_THIS, SDL_Window *window)
window->driverdata = NULL;
}
}
SDL_SemPost(Android_ActivitySem);
}
SDL_bool