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/* -*- c -*- */
/*
* Copyright 2014 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* GNU Radio is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3, or (at your option)
* any later version.
*
* GNU Radio is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Radio; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include <pthread.h>
#include <volk/volk_malloc.h>
#include <stdio.h>
#include <stdlib.h>
/*
* For #defines used to determine support for allocation functions,
* see: http://linux.die.net/man/3/aligned_alloc
*/
// Disabling use of aligned_alloc. This function requires that size be
// a multiple of alignment, which is too restrictive for many uses of
// VOLK.
//// If we are using C11 standard, use the aligned_alloc
//#ifdef _ISOC11_SOURCE
//
//void *volk_malloc(size_t size, size_t alignment)
//{
// void *ptr = aligned_alloc(alignment, size);
// if(ptr == NULL) {
// fprintf(stderr, "VOLK: Error allocating memory (aligned_alloc)\n");
// }
// return ptr;
//}
//
//void volk_free(void *ptr)
//{
// free(ptr);
//}
//
//#else // _ISOC11_SOURCE
// Otherwise, test if we are a POSIX or X/Open system
// This only has a restriction that alignment be a power of 2.
#if _POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600 || HAVE_POSIX_MEMALIGN
void *volk_malloc(size_t size, size_t alignment)
{
void *ptr;
int err = posix_memalign(&ptr, alignment, size);
if(err == 0) {
return ptr;
}
else {
fprintf(stderr, "VOLK: Error allocating memory (posix_memalign: %d)\n", err);
return NULL;
}
}
void volk_free(void *ptr)
{
free(ptr);
}
// _aligned_malloc has no restriction on size,
// available on Windows since Visual C++ 2005
#elif _MSC_VER >= 1400
void *volk_malloc(size_t size, size_t alignment)
{
void *ptr = _aligned_malloc(size, alignment);
if(ptr == NULL) {
fprintf(stderr, "VOLK: Error allocating memory (_aligned_malloc)\n");
}
return ptr;
}
void volk_free(void *ptr)
{
_aligned_free(ptr);
}
// No standard handlers; we'll do it ourselves.
#else // _POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600 || HAVE_POSIX_MEMALIGN
struct block_info
{
void *real;
};
void *
volk_malloc(size_t size, size_t alignment)
{
void *real, *user;
struct block_info *info;
/* At least align to sizeof our struct */
if (alignment < sizeof(struct block_info))
alignment = sizeof(struct block_info);
/* Alloc */
real = malloc(size + (2 * alignment - 1));
/* Get pointer to the various zones */
user = (void *)((((uintptr_t) real) + sizeof(struct block_info) + alignment - 1) & ~(alignment - 1));
info = (struct block_info *)(((uintptr_t)user) - sizeof(struct block_info));
/* Store the info for the free */
info->real = real;
/* Return pointer to user */
return user;
}
void
volk_free(void *ptr)
{
struct block_info *info;
/* Get the real pointer */
info = (struct block_info *)(((uintptr_t)ptr) - sizeof(struct block_info));
/* Release real pointer */
free(info->real);
}
#endif // _POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600 || HAVE_POSIX_MEMALIGN
//#endif // _ISOC11_SOURCE
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