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When isc_task_shutdown() is called, any shutdown events are posted and the task goes into shutting down state. isc_task_onshutdown() may no longer be called. If the task allows transition to the done state (the default), then as soon as the task's event queue is empty the task will enter the done state. Once the done state has been entered, events may no longer be posted (regardless of the allowsend state). If transition to the done state is not allowed, then the task will continue to exist and be able to receive events. Moved event support to event.[ch]. The final state of a task is now called "done" not "shutdown". Created a flags variable instead of having separate booleans. Added isc_task_allowdone() and isc_task_purgerange(). Minor tracing fixes.
Code Drop 2 Status Update Work since February has focused almost exclusively on the DNS library, especially on database implementation and resolver architecture. The DNS library now contains a transactional versioned database. In zone mode, the database supports multiple concurrent readers as well as a single in-progress abortable update (e.g. dynamic DNS or IXFR). In cache mode, multiple concurrent readers and writers are supported. We also have added interfaces for iterating the database, DNS compression, parsing and writing DNS messages. Our tree code now has support for bitstring labels (required for IPv6). DNS master file loading is more robust than in the first code drop. A significant amount of design and implementation work that we had hoped to do later in the project had to be done in the current time period. For example, both DNSSEC and IPv6 introduce DB and resolver complexities that are so fundamental that they could not be deferred until the time when we are actually implementing DNSSEC and IPv6 support. As a result, we have less code implemented than we had hoped, but are ahead of plan on parts of the design. We are currently finalizing the resolver design, and will start implementing it soon. Also nearing completion, but not included in this release, are library data types representing zones, the cache, and a standard C structure form for each rdata type. Tests A basic test framework and a set of tests are included in this release. The tests are in bin/tests/master bin/tests/names bin/tests/rbt To run a test, 'cd' into its directory and type 'make test'. Result of the tests are appended to bin/tests/t_journal We expect the test suite to become richer over time. Building We've had successful builds and tests on the following systems BSDI 3.1 Digital UNIX 4.0D HP-UX 11 Red Hat Linux 5.2 SGI IRIX 6.5 Solaris 2.6 To build, just ./configure make Do not run 'make install'. Building with gcc is not supported, unless gcc is the vendor's usual compiler (e.g. the various BSD systems, Linux). IRIX note: you must edit lib/isc/Makefile.in changing pthreads/condition.o \ @ISC_EXTRA_OBJS@ to pthreads/condition.o @ISC_EXTRA_OBJS@ before you run ./configure. Many compiler warnings, etc. are currently generated on IRIX. They will be cleaned up in a future release. bin/named Note Code in bin/named is for testing purposes only, and is not representative of the final architecture. Currently, it can load multiple zones and also a cache, and answer queries for those names. Because the server cannot recurse, and because it does not yet implement the full DNS protocol, it runs on port 5544, not port 53. API Note All APIs are subject to change in future code drops. We expect the existing library interfaces in the code drop to be quite stable, however, and unless we've specifically indicated that an interface is temporary, we don't expect significant changes in future releases.