What are the different timer that exists in the kernel?

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Just purely based on symbol search, I can see these different timer in
the system:

c01124ab t create_pit_timer
c0158d7c T posix_cpu_timer_create
c0158e7d t process_cpu_timer_create
c01569c9 T sys_timer_create
c01575e8 W sys_timerfd_create
c0158e67 t thread_cpu_timer_create


a.   what are the differences among these different timer?
b.   what are their individual purpose?
c.   since the hardware clock source is only a few possibility, what
their individual hardware infrastructure based on?   ie, all these
have ONE single hardware clock source?   WHY NOT? (resolution
differences?)

thanks for the sharing :-).


-- 
Regards,
Peter Teoh

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