[ECOS] Question about Kernel? (Scheduler)

[HuangQiang]

Hi all:
    I have got a problem in understanding the kernel of eCOS.
While creating a user thread(cyg_thread_create()) an CYG_Thread class object
pinter will be constructed, and in the object constructor it will call
CYG_Scheduler::scheduler.register_thread(). The question: isn't an object of
the CYG_Scheduler needed to be created? Also in the declaration of
CYG_Scheduler, an member variable scheduler type of CYG_Scheduler(In other
C++ program(like Visual C++) such definition can't be used at link time
while it can't find the symbol why?). So isn't an object of CYG_Scheduler
needed? why implement it in such
way(CYG_Scheduler::scheduler.register_thread())? Why don't create an object
of the CYG_Scheduler?  I don't understand why this is done in such way.
Could anybody give me some suggestion on it?



Thanks a lot!

regards!

james


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