Linux: Attempt to avoid race condition when tracking Display parent focus
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@ -623,8 +623,6 @@ final class LinuxDisplay implements DisplayImplementation {
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private native static void setInputFocus(long display, long window);
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private void processEvents() {
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if (!focused && parent != null && parent.isFocusOwner())
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setInputFocus(getDisplay(), getWindow());
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while (LinuxEvent.getPending(getDisplay()) > 0) {
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event_buffer.nextEvent(getDisplay());
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long event_window = event_buffer.getWindow();
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@ -742,15 +740,30 @@ final class LinuxDisplay implements DisplayImplementation {
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}
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private void checkInput() {
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focused = nGetInputFocus(getDisplay()) == getWindow();
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long current_focus = nGetInputFocus(getDisplay());
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focused = current_focus == getWindow();
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if (focused) {
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focused_at_least_once = true;
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acquireInput();
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} else if (focused_at_least_once) {
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} else {
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if (focused_at_least_once)
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releaseInput();
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if (parent != null && parent.isFocusOwner()) {
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// Normally, a real time stamp from an event should be passed to XSetInputFocus instead of CurrentTime, but we don't get timestamps
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// from awt. Instead we grab the server and check if the focus changed to avoid a race where our window is made unviewable while focusing it.
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grabServer(getDisplay());
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try {
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if (nGetInputFocus(getDisplay()) == current_focus)
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setInputFocus(getDisplay(), getWindow());
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} finally {
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ungrabServer(getDisplay());
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}
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}
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}
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}
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static native long nGetInputFocus(long display);
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private static native void grabServer(long display);
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private static native void ungrabServer(long display);
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private void releaseInput() {
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if (isLegacyFullscreen() || input_released)
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@ -327,14 +327,20 @@ static Window createWindow(JNIEnv* env, Display *disp, int screen, jint window_m
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return win;
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}
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JNIEXPORT void JNICALL Java_org_lwjgl_opengl_LinuxDisplay_grabServer(JNIEnv *env, jclass unused, jlong display) {
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Display *disp = (Display *)(intptr_t)display;
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XGrabServer(disp);
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}
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JNIEXPORT void JNICALL Java_org_lwjgl_opengl_LinuxDisplay_ungrabServer(JNIEnv *env, jclass unused, jlong display) {
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Display *disp = (Display *)(intptr_t)display;
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XUngrabServer(disp);
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}
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JNIEXPORT void JNICALL Java_org_lwjgl_opengl_LinuxDisplay_setInputFocus(JNIEnv *env, jclass clazz, jlong display, jlong window_ptr) {
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Display *disp = (Display *)(intptr_t)display;
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Window window = (Window)window_ptr;
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// Normally, a real time stamp from an event should be passed instead of CurrentTime, but we don't get timestamps
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// from awt. Instead we grab the server before and ungrab it after the request
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XGrabServer(disp);
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XSetInputFocus(disp, window, RevertToParent, CurrentTime);
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XUngrabServer(disp);
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}
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JNIEXPORT jlong JNICALL Java_org_lwjgl_opengl_LinuxDisplay_nCreateWindow(JNIEnv *env, jclass clazz, jlong display, jint screen, jobject peer_info_handle, jobject mode, jint window_mode, jint x, jint y, jboolean undecorated, jlong parent_handle) {
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