systemAverage.hpp

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/* Copyright 1996, LongView Technologies L.L.C. $Revision: 1.2 $ */
/* Copyright (c) 2006, Sun Microsystems, Inc.
All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the 
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    * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
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          disclaimer in the documentation and/or other materials provided with the distribution.
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// Keeps the sliding average of where the system spends the time
class SlidingSystemAverage : AllStatic {
 public:

  enum {
    // initial value
    nowhere             =  0,

    // ticks without last_delta_fp set 
    in_compiled_code    =  1, 
    in_interpreted_code =  2,
    in_pic_code         =  3,
    in_stub_code        =  4,

    // ticks with last_delta_fp set
    in_compiler         =  5,
    in_garbage_collect  =  6, // sacvenge or GC
    is_idle             =  7, // hanging in primitiveProcessSchedulerWait:
    in_vm               =  8, // somewhere else in the vm (primitive / dll)
    number_of_cases     =  9,

    buffer_size         = 256
  };


  // Resets the buffer
  static void reset();

  // Add tick to buffer
  static void add(char type);

  // Returns the update statistics array
  static unsigned int* update();

 private:
  static char         buffer[buffer_size];    // Buffer for the ticks
  static unsigned int stat[number_of_cases];  // Results from buffer
  static unsigned int pos;                    // Current pos in buffer
};

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