MONITOR(S)               XENIX System V                MONITOR(S)



     Name
          monitor - Prepares execution profile.

     Syntax
          void monitor(lowpc,highpc,buffer,bufsize,nfunc)
          int (*lowpc)( ), (*highpc)( );
          short *buffer;
          int bufsize, nfunc;

     Description
          monitor is an interface to profil(S).  lowpc and highpc are
          the addresses of two functions; buffer is the address of a
          user-supplied array of bufsize short integers.  monitor
          arranges to record a histogram of periodically sampled
          values of the program counter, and of counts of calls of
          certain functions, in the buffer.  The lowest address
          sampled is that of lowpc and the highest is just below
          highpc.  At most nfunc call counts can be kept; only calls
          of functions compiled with the profiling option -p of cc(CP)
          are recorded.  For the results to be significant, especially
          where there are small, heavily used routines, it is
          suggested that the buffer be no more than a few times
          smaller than the range of locations sampled.

          To profile the entire program, it is sufficient to use

               extern etext();
               ...
               monitor((int (*)())2, etext, buf, bufsize, nfunc);

          etext lies just above all the program text.

          To stop execution monitoring and write the results on the
          file mon.out, use

               monitor((int (*)())0);

          prof(CP) can then be used to examine the results.

     Files
          mon.out

     See Also
          cc(CP), prof(CP), profil(S)

     Notes
          An executable program created by cc -p automatically
          includes calls for monitor with default parameters; monitor
          needn't be called explicitly except to gain fine control
          over profiling.

     Warning



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     MONITOR(S)               XENIX System V                MONITOR(S)



          Profiling gives incorrect results for hybrid model 286
          programs (i.e.  those with 16 bit text pointers within
          modules and 32 bit text pointers between modules).




















































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