3 * Copyright 2008,2009 Free Software Foundation, Inc.
5 * This file is part of GNU Radio
7 * GNU Radio is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 3, or (at your option)
12 * GNU Radio is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with GNU Radio; see the file COPYING. If not, write to
19 * the Free Software Foundation, Inc., 51 Franklin Street,
20 * Boston, MA 02110-1301, USA.
27 #include "posix_memalign.h"
30 // for Cygwin valloc () prototype
34 #ifndef HAVE_POSIX_MEMALIGN
36 /* emulate posix_memalign functionality, to some degree */
39 #include "gr_pagesize.h"
42 (void **memptr, size_t alignment, size_t size)
44 /* emulate posix_memalign functionality, to some degree */
46 /* make sure the return handle is valid; return "bad address" if not valid */
51 /* make sure 'alignment' is a power of 2
52 * and multiple of sizeof (void*)
55 /* make sure 'alignment' is a multiple of sizeof (void*) */
56 if ((alignment % sizeof (void*)) != 0)
59 /* make sure 'alignment' is a power of 2 */
60 if ((alignment & (alignment - 1)) != 0)
65 #if (ALIGNED_MALLOC != 0)
67 /* if 'malloc' is known to be aligned, and the desired 'alignment'
68 * matches is <= that provided by 'malloc', then use 'malloc'. This
69 * works on, e.g., Darwin 8 & 9: for which malloc is 16-byte aligned.
71 size_t am = (size_t) ALIGNED_MALLOC;
72 if (alignment <= am) {
73 /* make sure ALIGNED_MALLOC is a power of 2, to guarantee that the
74 * alignment is correct (since 'alignment' must be a power of 2).
76 if ((am & (am - 1)) != 0)
78 /* good malloc alignment */
79 *memptr = malloc (size);
82 #endif /* (ALIGNED_MALLOC != 0) */
85 if (*memptr == (void*) 0) {
86 /* try valloc if it exists */
87 /* cheap and easy way to make sure alignment is met, so long as it
88 * is <= pagesize () */
89 if (alignment <= (size_t) gr_pagesize ()) {
90 *memptr = valloc (size);
94 #endif /* HAVE_VALLOC */
96 #if (ALIGNED_MALLOC == 0) && !defined (HAVE_VALLOC)
97 /* no posix_memalign, valloc, and malloc isn't known to be aligned
98 * (enough for the input arguments); no idea what to do.
101 #error gnuradio-core/src/libmissing/posix_memalign.cc: Cannot find a way to alloc aligned memory.
105 /* if the pointer wasn't allocated properly, return that there was
106 * not enough memory to allocate; otherwise, return OK (0).
108 if (*memptr == (void*) 0)
114 #endif /* ! HAVE_POSIX_MEMALIGN */