60 lines
2.1 KiB
C
60 lines
2.1 KiB
C
|
/*
|
||
|
|
* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
|
||
|
|
*
|
||
|
|
* Use of this source code is governed by a BSD-style license
|
||
|
|
* that can be found in the LICENSE file in the root of the source
|
||
|
|
* tree. An additional intellectual property rights grant can be found
|
||
|
|
* in the file PATENTS. All contributing project authors may
|
||
|
|
* be found in the AUTHORS file in the root of the source tree.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef WEBRTC_SYSTEM_WRAPPERS_INCLUDE_ALIGNED_MALLOC_H_
|
||
|
|
#define WEBRTC_SYSTEM_WRAPPERS_INCLUDE_ALIGNED_MALLOC_H_
|
||
|
|
|
||
|
|
// The functions declared here
|
||
|
|
// 1) Allocates block of aligned memory.
|
||
|
|
// 2) Re-calculates a pointer such that it is aligned to a higher or equal
|
||
|
|
// address.
|
||
|
|
// Note: alignment must be a power of two. The alignment is in bytes.
|
||
|
|
|
||
|
|
#include <stddef.h>
|
||
|
|
|
||
|
|
namespace webrtc {
|
||
|
|
|
||
|
|
// Returns a pointer to the first boundry of |alignment| bytes following the
|
||
|
|
// address of |ptr|.
|
||
|
|
// Note that there is no guarantee that the memory in question is available.
|
||
|
|
// |ptr| has no requirements other than it can't be NULL.
|
||
|
|
void* GetRightAlign(const void* ptr, size_t alignment);
|
||
|
|
|
||
|
|
// Allocates memory of |size| bytes aligned on an |alignment| boundry.
|
||
|
|
// The return value is a pointer to the memory. Note that the memory must
|
||
|
|
// be de-allocated using AlignedFree.
|
||
|
|
void* AlignedMalloc(size_t size, size_t alignment);
|
||
|
|
// De-allocates memory created using the AlignedMalloc() API.
|
||
|
|
void AlignedFree(void* mem_block);
|
||
|
|
|
||
|
|
// Templated versions to facilitate usage of aligned malloc without casting
|
||
|
|
// to and from void*.
|
||
|
|
template<typename T>
|
||
|
|
T* GetRightAlign(const T* ptr, size_t alignment) {
|
||
|
|
return reinterpret_cast<T*>(GetRightAlign(reinterpret_cast<const void*>(ptr),
|
||
|
|
alignment));
|
||
|
|
}
|
||
|
|
template<typename T>
|
||
|
|
T* AlignedMalloc(size_t size, size_t alignment) {
|
||
|
|
return reinterpret_cast<T*>(AlignedMalloc(size, alignment));
|
||
|
|
}
|
||
|
|
|
||
|
|
// Deleter for use with unique_ptr. E.g., use as
|
||
|
|
// std::unique_ptr<Foo, AlignedFreeDeleter> foo;
|
||
|
|
struct AlignedFreeDeleter {
|
||
|
|
inline void operator()(void* ptr) const {
|
||
|
|
AlignedFree(ptr);
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
} // namespace webrtc
|
||
|
|
|
||
|
|
#endif // WEBRTC_SYSTEM_WRAPPERS_INCLUDE_ALIGNED_MALLOC_H_
|