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Full Discussion: Malloc Implementation in C
Top Forums UNIX for Advanced & Expert Users Malloc Implementation in C Post 302399392 by pludi on Saturday 27th of February 2010 07:04:47 PM
Old 02-27-2010
I didn't study OS design, but shouldn't the malloc() function be part of the C library, not the kernel?

That aside, I'd write it in assembly language (after all, it's pretty CPU specific, and might even be time-critical). Also, it might help flipping through Tannenbaums Operating Systems Design and Implementation, as I'm sure that there's some information in there. Minix is the implementation of the theories put forth there.
 

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PHYSFS_Allocator(3)						      physfs						       PHYSFS_Allocator(3)

NAME
PHYSFS_Allocator - PhysicsFS allocation function pointers. SYNOPSIS
#include <physfs.h> Data Fields int(* Init )(void) void(* Deinit )(void) void *(* Malloc )(PHYSFS_uint64) void *(* Realloc )(void *, PHYSFS_uint64) void(* Free )(void *) Detailed Description PhysicsFS allocation function pointers. (This is for limited, hardcore use. If you don't immediately see a need for it, you can probably ignore this forever.) You create one of these structures for use with PHYSFS_setAllocator. Allocators are assumed to be reentrant by the caller; please mutex accordingly. Allocations are always discussed in 64-bits, for future expansion...we're on the cusp of a 64-bit transition, and we'll probably be allocating 6 gigabytes like it's nothing sooner or later, and I don't want to change this again at that point. If you're on a 32-bit platform and have to downcast, it's okay to return NULL if the allocation is greater than 4 gigabytes, since you'd have to do so anyhow. See also: PHYSFS_setAllocator Field Documentation void(* PHYSFS_Allocator::Deinit)(void) Deinitialize your allocator. Can be NULL. void(* PHYSFS_Allocator::Free)(void *) Free memory from Malloc or Realloc. int(* PHYSFS_Allocator::Init)(void) Initialize. Can be NULL. Zero on failure. void*(* PHYSFS_Allocator::Malloc)(PHYSFS_uint64) Allocate like malloc(). void*(* PHYSFS_Allocator::Realloc)(void *, PHYSFS_uint64) Reallocate like realloc(). Author Generated automatically by Doxygen for physfs from the source code. Version 2.0.2 Fri Feb 24 2012 PHYSFS_Allocator(3)
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