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369c38280a
directly in source files because the config.h file is system dependent, used just for compiling the source, and should not be installed. Some minor bug fixes. git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/base/trunk@2619 72102866-910b-0410-8b05-ffd578937521
138 lines
3.1 KiB
Objective-C
138 lines
3.1 KiB
Objective-C
/* Implementation of page-related functions for GNUstep
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Copyright (C) 1996, 1997 Free Software Foundation, Inc.
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Written by: Andrew Kachites McCallum <mccallum@gnu.ai.mit.edu>
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Created: May 1996
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This file is part of the GNUstep Base Library.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; if not, write to the Free
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Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <config.h>
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#include <gnustep/base/preface.h>
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#ifndef __WIN32__
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#include <unistd.h>
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#endif
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#include <stdio.h>
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#if __mach__
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#include <mach.h>
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#endif
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#ifdef __WIN32__
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#define getpagesize() vm_page_size
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#endif
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#ifdef __SOLARIS__
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#define getpagesize() sysconf(_SC_PAGESIZE)
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#endif
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#if __mach__
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#define getpagesize vm_page_size
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#endif
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/* Cache the size of a memory page here, so we don't have to make the
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getpagesize() system call repeatedly. */
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static unsigned ns_page_size = 0;
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/* Return the number of bytes in a memory page. */
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unsigned
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NSPageSize (void)
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{
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if (!ns_page_size)
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ns_page_size = (unsigned) getpagesize ();
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return ns_page_size;
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}
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/* Return log base 2 of the number of bytes in a memory page. */
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unsigned
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NSLogPageSize (void)
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{
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unsigned tmp_page_size = NSPageSize();
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unsigned log = 0;
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while (tmp_page_size >>= 1)
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log++;
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return log;
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}
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/* Round BYTES down to the nearest multiple of the memory page size,
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and return it. */
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unsigned
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NSRoundDownToMultipleOfPageSize (unsigned bytes)
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{
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unsigned a = NSPageSize();
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return (bytes / a) * a;
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}
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/* Round BYTES up to the nearest multiple of the memory page size,
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and return it. */
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unsigned
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NSRoundUpToMultipleOfPageSize (unsigned bytes)
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{
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unsigned a = NSPageSize();
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return ((bytes % a) ? ((bytes / a + 1) * a) : bytes);
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}
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unsigned
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NSRealMemoryAvailable ()
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{
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fprintf (stderr, "NSRealMemoryAvailable() not implemented.\n");
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return 0;
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}
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void *
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NSAllocateMemoryPages (unsigned bytes)
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{
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void *where;
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#if __mach__
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kern_return_t r;
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r = vm_allocate (mach_task_self(), &where, (vm_size_t) bytes, 1);
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if (r != KERN_SUCCESS)
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return NULL;
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return where;
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#else
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where = valloc (bytes);
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if (where == NULL)
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return NULL;
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memset (where, 0, bytes);
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return where;
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#endif
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}
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void
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NSDeallocateMemoryPages (void *ptr, unsigned bytes)
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{
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#if __mach__
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vm_deallocate (mach_task_self (), ptr, bytes);
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#else
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free (ptr);
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#endif
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}
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void
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NSCopyMemoryPages (const void *source, void *dest, unsigned bytes)
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{
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#if __mach__
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kern_return_t r;
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r = vm_copy (mach_task_self(), source, bytes, dest);
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NSParameterAssert (r == KERN_SUCCESS);
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#else
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memcpy (dest, source, bytes);
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#endif
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}
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