diff options
Diffstat (limited to 'source3/architecture.doc')
| -rw-r--r-- | source3/architecture.doc | 21 |
1 files changed, 10 insertions, 11 deletions
diff --git a/source3/architecture.doc b/source3/architecture.doc index afcec6d50a..ff0fcefb86 100644 --- a/source3/architecture.doc +++ b/source3/architecture.doc @@ -105,17 +105,16 @@ nbmd Design Originally Andrew used recursion to simulate a multi-threaded environment, which use the stack enormously and made for really confusing debugging sessions. Luke Leighton rewrote it to use a -queuing system that keeps state information on each packet. During the -1.9.18 alpha series it was decided that this was too unwieldy to -manage. If the protocol was cleaner than it is then it would be OK -but with the way the protocol works you really need some data hiding. -The mistake we made was to transfer all the info from the packets to -more specialised structures. It bit us badly when we then found we -needed some detail of the original packet to handle some special -case. The specialised structures kept growing till they almost -contained all the info of the original packet! The code became -extremely hairy, which became particularly evident when Jeremy fixed -browsing on multiple subnets for 1.9.17. +queuing system that keeps state information on each packet. The +first version used a single structure which was used by all the +pending states. As the initialisation of this structure was +done by adding arguments, as the functionality developed, it got +pretty messy. So, it was replaced with a higher-order function +and a pointer to a user-defined memory block. This suddenly +made things much simpler: large numbers of functions could be +made static, and modularised. This is the same principle as used +in NT's kernel, and achieves the same effect as threads, but in +a single process. Then Jeremy rewrote nmbd. The packet data in nmbd isn't what's on the wire. It's a nice format that is very amenable to processing but still |