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Intel Threading Building Blocks
book

Intel Threading Building Blocks

by James Reinders
July 2007
Intermediate to advanced content levelIntermediate to advanced
332 pages
10h 4m
English
O'Reilly Media, Inc.
Content preview from Intel Threading Building Blocks

Replacing malloc, calloc, realloc, and free

Four simple interfaces that provide equivalent functionality to malloc, free, realloc, and calloc exist:

	#include "tbb/scalable_allocator.h"
	void * scalable_malloc (size_t size);
	void   scalable_free (void* ptr);
	void * scalable_realloc (void* ptr, size_t size);
	void * scalable_calloc (size_t nobj, size_t size);

These can be used to replace the C language malloc, free, realloc, and calloc memory functions by calling them instead. In general, that is the safest and easiest choice.

Tip

You do not want to make malloc a call to scalable_allocator because scalable_malloc(n) returns a pointer with sufficient alignment for any type, whereas scalable_allocator<char>().allocate(n) is guaranteed only to return a pointer with sufficient alignment for type char.

Be sure that memory from scalable_malloc is freed using scalable_free, and that memory from malloc is freed using free. Mixing these up can have results which are difficult to debug. Therefore, Threading Building Blocks does not attempt to replace malloc, free, realloc, and calloc for you. If you are diligent and make sure you are not mixing malloc with free and scalable_malloc with scalable_free (including if you use a module compiled to use the standard malloc to obtain objects you later free), you can also replace the definitions using extern statements and macros. The code to do this is in Example 11-52.

Example 11-52. Replacing malloc, calloc, realloc, and free

extern "C" void * scalable_malloc(size_t ...
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Publisher Resources

ISBN: 9780596514808Errata Page