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/*
* Copyright (c) 2022, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
#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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