|
d@0
|
1 <html lang="en">
|
|
d@0
|
2 <head>
|
|
d@0
|
3 <title>Memory Allocation - FFTW 3.2.1</title>
|
|
d@0
|
4 <meta http-equiv="Content-Type" content="text/html">
|
|
d@0
|
5 <meta name="description" content="FFTW 3.2.1">
|
|
d@0
|
6 <meta name="generator" content="makeinfo 4.8">
|
|
d@0
|
7 <link title="Top" rel="start" href="index.html#Top">
|
|
d@0
|
8 <link rel="up" href="Data-Types-and-Files.html#Data-Types-and-Files" title="Data Types and Files">
|
|
d@0
|
9 <link rel="prev" href="Precision.html#Precision" title="Precision">
|
|
d@0
|
10 <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
|
|
d@0
|
11 <!--
|
|
d@0
|
12 This manual is for FFTW
|
|
d@0
|
13 (version 3.2.1, 5 February 2009).
|
|
d@0
|
14
|
|
d@0
|
15 Copyright (C) 2003 Matteo Frigo.
|
|
d@0
|
16
|
|
d@0
|
17 Copyright (C) 2003 Massachusetts Institute of Technology.
|
|
d@0
|
18
|
|
d@0
|
19 Permission is granted to make and distribute verbatim copies of
|
|
d@0
|
20 this manual provided the copyright notice and this permission
|
|
d@0
|
21 notice are preserved on all copies.
|
|
d@0
|
22
|
|
d@0
|
23 Permission is granted to copy and distribute modified versions of
|
|
d@0
|
24 this manual under the conditions for verbatim copying, provided
|
|
d@0
|
25 that the entire resulting derived work is distributed under the
|
|
d@0
|
26 terms of a permission notice identical to this one.
|
|
d@0
|
27
|
|
d@0
|
28 Permission is granted to copy and distribute translations of this
|
|
d@0
|
29 manual into another language, under the above conditions for
|
|
d@0
|
30 modified versions, except that this permission notice may be
|
|
d@0
|
31 stated in a translation approved by the Free Software Foundation.
|
|
d@0
|
32 -->
|
|
d@0
|
33 <meta http-equiv="Content-Style-Type" content="text/css">
|
|
d@0
|
34 <style type="text/css"><!--
|
|
d@0
|
35 pre.display { font-family:inherit }
|
|
d@0
|
36 pre.format { font-family:inherit }
|
|
d@0
|
37 pre.smalldisplay { font-family:inherit; font-size:smaller }
|
|
d@0
|
38 pre.smallformat { font-family:inherit; font-size:smaller }
|
|
d@0
|
39 pre.smallexample { font-size:smaller }
|
|
d@0
|
40 pre.smalllisp { font-size:smaller }
|
|
d@0
|
41 span.sc { font-variant:small-caps }
|
|
d@0
|
42 span.roman { font-family:serif; font-weight:normal; }
|
|
d@0
|
43 span.sansserif { font-family:sans-serif; font-weight:normal; }
|
|
d@0
|
44 --></style>
|
|
d@0
|
45 </head>
|
|
d@0
|
46 <body>
|
|
d@0
|
47 <div class="node">
|
|
d@0
|
48 <p>
|
|
d@0
|
49 <a name="Memory-Allocation"></a>
|
|
d@0
|
50 Previous: <a rel="previous" accesskey="p" href="Precision.html#Precision">Precision</a>,
|
|
d@0
|
51 Up: <a rel="up" accesskey="u" href="Data-Types-and-Files.html#Data-Types-and-Files">Data Types and Files</a>
|
|
d@0
|
52 <hr>
|
|
d@0
|
53 </div>
|
|
d@0
|
54
|
|
d@0
|
55 <h4 class="subsection">4.1.3 Memory Allocation</h4>
|
|
d@0
|
56
|
|
d@0
|
57 <pre class="example"> void *fftw_malloc(size_t n);
|
|
d@0
|
58 void fftw_free(void *p);
|
|
d@0
|
59 </pre>
|
|
d@0
|
60 <p><a name="index-fftw_005fmalloc-142"></a><a name="index-fftw_005ffree-143"></a>
|
|
d@0
|
61 These are functions that behave identically to <code>malloc</code> and
|
|
d@0
|
62 <code>free</code>, except that they guarantee that the returned pointer obeys
|
|
d@0
|
63 any special alignment restrictions imposed by any algorithm in FFTW
|
|
d@0
|
64 (e.g. for SIMD acceleration). See <a href="Data-Alignment.html#Data-Alignment">Data Alignment</a>.
|
|
d@0
|
65 <a name="index-alignment-144"></a>
|
|
d@0
|
66 Data allocated by <code>fftw_malloc</code> <em>must</em> be deallocated by
|
|
d@0
|
67 <code>fftw_free</code> and not by the ordinary <code>free</code>.
|
|
d@0
|
68
|
|
d@0
|
69 <p>These routines simply call through to your operating system's
|
|
d@0
|
70 <code>malloc</code> or, if necessary, its aligned equivalent
|
|
d@0
|
71 (e.g. <code>memalign</code>), so you normally need not worry about any
|
|
d@0
|
72 significant time or space overhead. You are <em>not required</em> to use
|
|
d@0
|
73 them to allocate your data, but we strongly recommend it.
|
|
d@0
|
74
|
|
d@0
|
75 <p>Note: in C++, just as with ordinary <code>malloc</code>, you must typecast
|
|
d@0
|
76 the output of <code>fftw_malloc</code> to whatever pointer type you are
|
|
d@0
|
77 allocating.
|
|
d@0
|
78 <a name="index-C_002b_002b-145"></a>
|
|
d@0
|
79 <!-- -->
|
|
d@0
|
80
|
|
d@0
|
81 </body></html>
|
|
d@0
|
82
|
