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/** Implementation of page-related functions for GNUstep
Copyright (C) 1996, 1997 Free Software Foundation, Inc.
Written by: Andrew Kachites McCallum <mccallum@gnu.ai.mit.edu>
Created: May 1996
This file is part of the GNUstep Base Library.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02111 USA.
<title>NSPage class reference</title>
$Date: 2010-06-17 20:08:08 +0100 (Thu, 17 Jun 2010) $ $Revision: 30772 $
*/
#import "common.h"
#include <string.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <stdio.h>
#if __mach__
#include <mach.h>
#endif
#ifdef __CYGWIN__
#include <malloc.h>
#endif
#ifdef __MINGW__
#include <malloc.h>
static size_t
getpagesize(void)
{
SYSTEM_INFO info;
GetSystemInfo(&info);
return info.dwPageSize;
}
#endif
#ifdef __SOLARIS__
#define getpagesize() sysconf(_SC_PAGESIZE)
#endif
#ifdef __svr4__
#define getpagesize() sysconf(_SC_PAGESIZE)
#endif
#if __mach__
#define getpagesize vm_page_size
#endif
#ifdef __BEOS__
#include <kernel/OS.h>
#define getpagesize() B_PAGE_SIZE
#endif
/* Cache the size of a memory page here, so we don't have to make the
getpagesize() system call repeatedly. */
static NSUInteger ns_page_size = 0;
/**
* Return the number of bytes in a memory page.
*/
NSUInteger
NSPageSize (void)
{
if (!ns_page_size)
ns_page_size = getpagesize ();
return ns_page_size;
}
/**
* Return log base 2 of the number of bytes in a memory page.
*/
NSUInteger
NSLogPageSize (void)
{
NSUInteger tmp_page_size = NSPageSize();
NSUInteger log = 0;
while (tmp_page_size >>= 1)
log++;
return log;
}
/**
* Round bytes down to the nearest multiple of the memory page size,
* and return it.
*/
NSUInteger
NSRoundDownToMultipleOfPageSize (NSUInteger bytes)
{
NSUInteger a = NSPageSize();
return (bytes / a) * a;
}
/**
* Round bytes up to the nearest multiple of the memory page size,
* and return it.
*/
NSUInteger
NSRoundUpToMultipleOfPageSize (NSUInteger bytes)
{
NSUInteger a = NSPageSize();
return ((bytes % a) ? ((bytes / a + 1) * a) : bytes);
}
#if __linux__
#include <sys/sysinfo.h>
#endif
/**
* Return the number of bytes of real (physical) memory available.
*/
NSUInteger
NSRealMemoryAvailable ()
{
#if __linux__
struct sysinfo info;
if ((sysinfo(&info)) != 0)
return 0;
return info.freeram;
#elif defined(__MINGW__)
MEMORYSTATUSEX memory;
memory.dwLength = sizeof(memory);
GlobalMemoryStatusEx(&memory);
return memory.ullAvailPhys;
#elif defined(__BEOS__)
system_info info;
if (get_system_info(&info) != B_OK)
return 0;
return (info.max_pages - info.used_pages) * B_PAGE_SIZE;
#else
fprintf (stderr, "NSRealMemoryAvailable() not implemented.\n");
return 0;
#endif
}
/**
* Allocate memory for this process and return a pointer to it (or a null
* pointer on failure). The allocated memory is page aligned and the
* actual size of memory allocated is a multiple of the page size.
*/
void *
NSAllocateMemoryPages (NSUInteger bytes)
{
NSUInteger size = NSRoundUpToMultipleOfPageSize (bytes);
void *where;
#if defined(__MINGW__)
where = VirtualAlloc(NULL, size, MEM_RESERVE|MEM_COMMIT, PAGE_READWRITE);
#elif __mach__
kern_return_t r;
r = vm_allocate (mach_task_self(), &where, (vm_size_t) size, 1);
if (r != KERN_SUCCESS)
return NULL;
return where;
#elif HAVE_POSIX_MEMALIGN
if (posix_memalign(&where, NSPageSize(), size) != 0)
return NULL;
#else
where = valloc (size);
if (where == NULL)
return NULL;
#endif
memset (where, 0, bytes);
return where;
}
/**
* Deallocate memory which was previously allocated using the
* NSAllocateMemoryPages() function.<br />
* The bytes argument should be the same as the value passed
* to the NSAllocateMemoryPages() function.
*/
void
NSDeallocateMemoryPages (void *ptr, NSUInteger bytes)
{
#if defined(__MINGW__)
VirtualFree(ptr, 0, MEM_RELEASE);
#elif __mach__
vm_deallocate (mach_task_self (), ptr, NSRoundUpToMultipleOfPageSize (bytes));
#else
free (ptr);
#endif
}
/**
* Perform an efficient large scale copy of data from src to dest.
* The value bytes specifies the length of the data copied.
*/
void
NSCopyMemoryPages (const void *src, void *dest, NSUInteger bytes)
{
#if __mach__
kern_return_t r;
r = vm_copy (mach_task_self(), src, bytes, dest);
NSParameterAssert (r == KERN_SUCCESS);
#else
memcpy (dest, src, bytes);
#endif
}
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