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glibc  2.9
pagecopy.h
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00001 /* Macros for copying by pages; used in memcpy, memmove.  Mach version.
00002    Copyright (C) 1995, 1997 Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004 
00005    The GNU C Library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Lesser General Public
00007    License as published by the Free Software Foundation; either
00008    version 2.1 of the License, or (at your option) any later version.
00009 
00010    The GNU C Library is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013    Lesser General Public License for more details.
00014 
00015    You should have received a copy of the GNU Lesser General Public
00016    License along with the GNU C Library; if not, write to the Free
00017    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00018    02111-1307 USA.  */
00019 
00020 #include <mach.h>
00021 
00022 /* Threshold at which vm_copy is more efficient than well-optimized copying
00023    by words.  This parameter should be tuned as necessary.  */
00024 #define PAGE_THRESHOLD             (2 * PAGE_SIZE)      /* XXX ? */
00025 
00026 #define PAGE_SIZE           __vm_page_size
00027 #define PAGE_COPY_FWD(dstp, srcp, nbytes_left, nbytes)                      \
00028   ((nbytes_left) = ((nbytes) -                                              \
00029                   (__vm_copy (__mach_task_self (),                          \
00030                             (vm_address_t) srcp, trunc_page (nbytes),     \
00031                             (vm_address_t) dstp) == KERN_SUCCESS            \
00032                    ? trunc_page (nbytes)                             \
00033                    : 0)))
00034 
00035 /* Get the generic macro.  */
00036 #include <sysdeps/generic/pagecopy.h>