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XtAppLock, XtAppUnlock - lock and unlock application context
void
XtAppLock(app_context)
XtAppContext app_context;
void
XtAppUnlock(app_context)
XtAppContext app_context;
Specifies the application context.
XtAppLock locks the application context including all its related displays and widgets.
XtAppUnlock
unlocks the application context.
X Toolkit Intrinsics -- C Language Interface
Xlib -- C Language X Interface