prepare

Prepares to poll sources within a main loop.

The resulting information for polling is determined by calling g_main_context_query ().

You must have successfully acquired the context with acquire before you may call this function.

Parameters:

this	a MainContext (if null, the global-default main context will be used)
priority	location to store priority of highest priority source already ready.

Returns:

true if some source is ready to be dispatched prior to polling.