AIRES library reference: pcputime.

c
c     Routine directly callable from C/C++ (it could be necessary to
c     append an underscore, "_", to its name depending on the C/C++
c     compiler used).
c
c
      subroutine pcputime(setflag, total, fromlast)
c
c     Precise (ns-like error range) total and partial processor times.
c     Functionality similar as ruoutine "pcputime".
c     SYSTEM DEPENDENT CALL INSIDE!
c
c     Written by: S. J. Sciutto, La Plata 1996, 2017, 2018.
c
c     Parameters:
c     ==========
c
c     setflag......... (input, logical) Logical flag to mark the
c                      beginning of CPU time counts (See fromlast).
c     total........... (output, real*8) Total CPU time, as returned
c                      by the system-dependent call.
c     fromlast........ (output, real*8) CPU time elapsed from the
c                      last call to "cputime" with "setflag" set to
c                      ".true.". This argument may contain an
c                      erroneous value the first time this routine
c                      is called.
c
c
c<--->

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