public static boolean XineramaIsEnabled(long displayHandle) {
if (0 == displayHandle) {
throw new IllegalArgumentException("X11 Display handle is NULL");
}
final String displayName = X11Lib.XDisplayString(displayHandle);
synchronized (displayXineramaEnabledMap) {
final Boolean b = displayXineramaEnabledMap.get(displayName);
if (null != b) {
return b.booleanValue();
}
}
final boolean res;
if (!XineramaFetched) { // volatile: ok
synchronized (X11Util.class) {
if (!XineramaFetched) {
XineramaLibHandle = X11Lib.XineramaGetLibHandle();
if (0 != XineramaLibHandle) {
XineramaQueryFunc = X11Lib.XineramaGetQueryFunc(XineramaLibHandle);
}
XineramaFetched = true;
}
}
}
if (0 != XineramaQueryFunc) {
res = X11Lib.XineramaIsEnabled(XineramaQueryFunc, displayHandle);
} else {
if (DEBUG) {
System.err.println(
"XineramaIsEnabled: Couldn't bind to Xinerama - lib 0x"
+ Long.toHexString(XineramaLibHandle)
+ "query 0x"
+ Long.toHexString(XineramaQueryFunc));
}
res = false;
}
synchronized (displayXineramaEnabledMap) {
if (DEBUG) {
System.err.println(
"XineramaIsEnabled Cache: Display "
+ displayName
+ " (0x"
+ Long.toHexString(displayHandle)
+ ") -> "
+ res);
}
displayXineramaEnabledMap.put(displayName, Boolean.valueOf(res));
}
return res;
}
