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[glibc.git] / sysdeps / mach / pagecopy.h
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1 /* Macros for copying by pages; used in memcpy, memmove. Mach version.
2 Copyright (C) 1995, 1997 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18 02111-1307 USA. */
20 #include <mach.h>
22 /* Threshold at which vm_copy is more efficient than well-optimized copying
23 by words. This parameter should be tuned as necessary. */
24 #define PAGE_THRESHOLD (2 * PAGE_SIZE) /* XXX ? */
26 #define PAGE_SIZE __vm_page_size
27 #define PAGE_COPY_FWD(dstp, srcp, nbytes_left, nbytes) \
28 ((nbytes_left) = ((nbytes) - \
29 (__vm_copy (__mach_task_self (), \
30 (vm_address_t) srcp, trunc_page (nbytes), \
31 (vm_address_t) dstp) == KERN_SUCCESS \
32 ? trunc_page (nbytes) \
33 : 0)))
35 /* Get the generic macro. */
36 #include <sysdeps/generic/pagecopy.h>