Quelle osInfo.hpp Sprache: C

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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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#ifndef SHARE_RUNTIME_OSINFO_HPP
#define SHARE_RUNTIME_OSINFO_HPP

#include "memory/allStatic.hpp"
#include "utilities/debug.hpp"

// Static information about the operating system. Initialized exactly once
// at VM start-up and never changes again.
class OSInfo : AllStatic {
  static int    _vm_page_size;
  static int    _vm_allocation_granularity;

public:
  // Returns the byte size of a virtual memory page
  static int vm_page_size() { return _vm_page_size; }

  // Returns the size, in bytes, of the granularity with which memory can be reserved using os::reserve_memory().
  static int vm_allocation_granularity() { return _vm_allocation_granularity; }

  static void set_vm_page_size(int n) {
    assert(_vm_page_size < 0, "init only once");
    assert(n > 0, "sanity");
    _vm_page_size = n;
  }

  static void set_vm_allocation_granularity(int n) {
    assert(_vm_allocation_granularity < 0, "init only once");
    assert(n > 0, "sanity");
    _vm_allocation_granularity = n;
  }
};

#endif // SHARE_RUNTIME_OSINFO_HPP

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