[ CCode ( cname = "wnck_pid_read_resource_usage" ) ]
public static ResourceUsage pid_read (Display gdk_display, ulong pid)
Looks for the X resource usage of the application with process ID pid on display gdisplay.
If no resource usage can be found, then all fields of usage are set to 0.
In order to find the resource usage of an application that does not have an X window visible to libwnck (panel applets do not have any toplevel windows, for example), pid_read walks through the whole tree of X windows. Since this walk is expensive in CPU, a cache is created. This cache is updated in the background. This means there is a non-null probability that no resource usage will be found for an application, even if it is an X client. If this happens, calling pid_read again after a few seconds should work.
To properly work, this function requires the XRes extension on the X server.
| gdk_display |
a Display. |
| pid |
a process ID. |
| usage |
return location for the X resource usage of the application with process ID |