erlang R12B预览版本出来了

erlang R12B预览版本出来了 可以在 http://erlang.org/download/snapshots/otp_src_R12B-0.tar.gz  下载, 正在比对 看作了什么改进。

好像还没有正式公布吧？

1. emulator里面改了不少opcode, 还有lock的使用更严谨。
2. 库就是 mnesia  inets stdlib kernel ssl ssh几个改动的比较多
3. 相应的compiler改了 不少支持新的特性如 -spec()
4. stdlib添加了个array的数据结构

改动主要体现在易用性和bug修复.

In the final R12B, there will probably be changes to the
bit-level binaries. Source code that use bit-level binaries with
the R11B syntax will compile in R12B-0, but not in R12B-1.
(The only reason for allowing the experimental syntax in R12B-0 is that
we bootstrap the next release using the latest official release.)

The performance of most bit syntax code will be better in R12B than
in R11B (it should never be slower).

root@i004:~/otp_src_R12B-0/bin# ./erl                           
Erlang (BEAM) emulator version 5.6 [source] [smp:4] [async-threads:0] [hipe] [kernel-poll:false]

Eshell V5.6  (abort with ^G)

r12b默认启用smp 这个难道说明对smp的稳定度有信心了？

-spec只是用来产生文档的？看起来还行，比以前那个放在注释里的要漂亮多了，要是可以用来做一个代码检查就更好了。

Release of R12B 5:th of December