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authorAvneesh Sachdev <avneesh@opensourcerouting.org>2012-08-17 08:19:50 -0700
committerDavid Lamparter <equinox@opensourcerouting.org>2012-09-26 21:50:48 +0200
commit28971c8cb1138700e87dc7da673e59b5596bb51b (patch)
tree0e55c3f830681449cd96bb36eb04a6a1293d8b44 /ospfd
parent67174041d2d9d8908f8b2c915bc0d186d8442c68 (diff)
lib/table: add route_table_get_next() and iterator
* lib/table.[ch] - Add a function (route_table_get_next()) to get the route_node in a tree that succeeds a given prefix in iteration order. This allows one to reliably walk nodes in a tree while allowing modifications, and is useful for achieving scale and performance. Other approaches are also possible -- the main plus point of this one is that it does not require any state about the walk to be maintained in the table data structures. - Add an iterator for walking the nodes in a tree. This introduces a new structure (route_table_iter_t) and the following main functions. route_table_iter_init() route_table_iter_pause() route_table_iter_next() route_table_iter_cleanup() The iterator normally uses node pointers and the existing route_next() function to walk nodes efficiently. When an iteration is 'paused' with route_table_iter_pause(), it stores the last prefix processed. The next call to route_table_iter_next() transparently invokes route_table_get_next() with the prefix to resume iteration. * bgpd/bgp_table.[ch] Add wrappers for the new table features described above. * tests/table_test.c Add tests for the new table code. Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
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