[RFA] Add some code in observer.c to allow unit-testing

[Joel Brobecker <brobecker@gnat.com>]

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Hello again,

Following a small discussion in gdb@, I have written a small regression
test for observer.c.

        http://sources.redhat.com/ml/gdb/2003-03/msg00147.html

The test is done by doing inferior function calls to the normal_stop
observer routines. The sticky point is that the attach routine needs
to be provided with a function pointer (callback).  This patch adds
3 static counters and 3 static functions that simply increment these
counters.  These functions will be provided to the attach routine during
the test (See upcoming testsuite patch for more details)

2003-03-17  J. Brobecker  <brobecker@gnat.com>

	* observer.c (observer_test_first_observer): New static variable.
	(observer_test_second_observer): Likewise.
	(observer_test_third_observer): Likewise.
	(observer_test_first_notification_function): New static function.
	(observer_test_second_notification_function): Likewise.
	(observer_test_third_notification_function): Likewise.

Ok to apply?

Thanks,
-- 
Joel

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Index: observer.c
===================================================================
RCS file: /cvs/src/src/gdb/observer.c,v
retrieving revision 1.2
diff -c -3 -p -r1.2 observer.c
*** observer.c	28 Feb 2003 07:19:32 -0000	1.2
--- observer.c	18 Mar 2003 01:51:47 -0000
*************** observer_notify_normal_stop (void)
*** 190,192 ****
--- 190,218 ----
  {
    generic_observer_notify (normal_stop_subject, NULL);
  }
+ 
+ /* The following code is only used to unit-test the observers from
+    our testsuite.  DO NOT USE IT within observer.c!  */
+ 
+ static int observer_test_first_observer = 0;
+ static int observer_test_second_observer = 0;
+ static int observer_test_third_observer = 0;
+ 
+ static void
+ observer_test_first_notification_function (void)
+ {
+   observer_test_first_observer++;
+ }
+ 
+ static void
+ observer_test_second_notification_function (void)
+ {
+   observer_test_second_observer++;
+ }
+ 
+ static void
+ observer_test_third_notification_function (void)
+ {
+   observer_test_third_observer++;
+ }
+