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50 lines
1.1 KiB
C++
50 lines
1.1 KiB
C++
/*
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* The LLVM Compiler Infrastructure
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*
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* This file was developed by the LLVM research group and is distributed under
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* the University of Illinois Open Source License. See LICENSE.TXT for details.
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*
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******************************************************************************
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*
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* This header file provides a platform-independent way of quering page size.
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*/
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#ifndef PAGESIZE_H
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#define PAGESIZE_H
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#include "Config/unistd.h"
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#include <sys/param.h>
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namespace llvm {
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/* Compatibility chart:
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*
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* Linux/x86: _SC_PAGESIZE, _SC_PAGE_SIZE
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* MacOS X/PowerPC: v. 10.2: NBPG,
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* v. 10.3: _SC_PAGESIZE
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* Solaris/Sparc: _SC_PAGESIZE, _SC_PAGE_SIZE
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*/
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/**
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* GetPageSize - wrapper to return page size in bytes for various
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* architecture/OS combinations
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*/
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unsigned GetPageSize() {
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#ifdef _SC_PAGESIZE
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return sysconf(_SC_PAGESIZE);
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#elif defined(_SC_PAGE_SIZE)
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return sysconf(_SC_PAGE_SIZE);
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#elif defined(NBPG)
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#ifndef CLSIZE
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#define CLSIZE 1
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#endif
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return NBPG * CLSIZE;
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#else
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return 4096; /* allocate 4KB as a fall-back */
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#endif
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}
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}
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#endif
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