todo

一个开源的网络开发库ACE

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	* Emulation:
	  - pthreads
	  - dirent

	* ACE_wrappers/PACE/docs/PACE_POSIX_support.txt:

	  Update this file as emulation occurs.

	* Build ACE with ACE_HAS_PACE

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	* pthreads: Do we need to define this for win32?

	  OS.cpp:2769 => PACE_PTHREAD_STACK_MIN
	  OS.cpp:2798 => PACE_PTHREAD_CREATE_JOINABLE
	  OS.cpp:2801 => PACE_PTHREAD_CREATE_DETACHED

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        * get rid of the temp macros / junk in config/constants.h

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        * add MFC support to pthread.c

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