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