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Linux: Attempt to avoid race condition when tracking Display parent focus

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This commit is contained in:
Elias Naur 2008-04-06 21:34:22 +00:00
parent c499f33bcf
commit bf25259325
2 changed files with 28 additions and 9 deletions
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23
src/java/org/lwjgl/opengl/LinuxDisplay.java
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@ -623,8 +623,6 @@ final class LinuxDisplay implements DisplayImplementation {
private native static void setInputFocus(long display, long window);
private void processEvents() {
if (!focused && parent != null && parent.isFocusOwner())
setInputFocus(getDisplay(), getWindow());
while (LinuxEvent.getPending(getDisplay()) > 0) {
event_buffer.nextEvent(getDisplay());
long event_window = event_buffer.getWindow();
@ -742,15 +740,30 @@ final class LinuxDisplay implements DisplayImplementation {
}
private void checkInput() {
focused = nGetInputFocus(getDisplay()) == getWindow();
long current_focus = nGetInputFocus(getDisplay());
focused = current_focus == getWindow();
if (focused) {
focused_at_least_once = true;
acquireInput();
} else if (focused_at_least_once) {
releaseInput();
} else {
if (focused_at_least_once)
releaseInput();
if (parent != null && parent.isFocusOwner()) {
// Normally, a real time stamp from an event should be passed to XSetInputFocus instead of CurrentTime, but we don't get timestamps
// 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.
grabServer(getDisplay());
try {
if (nGetInputFocus(getDisplay()) == current_focus)
setInputFocus(getDisplay(), getWindow());
} finally {
ungrabServer(getDisplay());
}
}
}
}
static native long nGetInputFocus(long display);
private static native void grabServer(long display);
private static native void ungrabServer(long display);
private void releaseInput() {
if (isLegacyFullscreen() || input_released)