[FZH] [D] C库函数timer_create()参数问题

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      CLOCK_REALTIME£¨Ç½ÉÏʱ¼ä£©
             A settable system-wide real-time clock.

      CLOCK_MONOTONIC
             A nonsettable monotonically increasing clock that measures time
from
             some unspecified point in the past that does not change after
system
             startup.

      CLOCK_PROCESS_CPUTIME_ID (since Linux 2.6.12)£¨¸Ã½ø³ÌµÄCPUʱ¼ä£©
             A clock that measures (user and system) CPU time consumed by
(all of
             the threads in) the calling process.

      CLOCK_THREAD_CPUTIME_ID (since Linux 2.6.12)£¨¸ÃÏ̵߳ÄCPUʱ¼ä£©
             A clock that measures (user and system) CPU time consumed by
the
             calling thread.

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