Avoiding Deadlock in Callbacks
Callbacks can easily manifest the phenomenon of distributed deadlock. Consider the system shown in Figure 9.1, where a client with a callback object makes an invocation on a CORBA object in a server. Both client and server are single threaded.
Figure 9.1. Deadlock in a system using callbacks.
Because the client is single threaded, it uses an event loop, as shown in Listing 9.1 and Listing 9.2. In the course of executing the process_user_input() function, the client makes a remote invocation on the server’s CORBA object. Consider what happens if the server calls back on the client’s CORBA object while processing ...
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