10-24-2011
What the actual problem is that, there is an application that needs quite some amount of memory to run.
However, it does not get so much as our board is running low on memory. So we were thinking to reserve some memory and create a program that acts as a memory manager and assign that application memory when in demand. Else it will be in waiting most of the time.
If i could get a small prototype that would suffice.
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MEMORY(3) BSD Library Functions Manual MEMORY(3)
NAME
alloca, calloc, free, malloc, mmap, realloc -- general memory allocation operations
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <stdlib.h>
void *
alloca(size_t size);
void *
calloc(size_t nelem, size_t elsize);
void
free(void *ptr);
void *
malloc(size_t size);
void *
realloc(void *ptr, size_t size);
#include <sys/mman.h>
void *
mmap(void * addr, size_t len, int prot, int flags, int fildes, off_t off);
DESCRIPTION
These functions allocate and free memory for the calling process. They are described in the individual manual pages.
LEGACY SYNOPSIS
#include <sys/types.h>
#include <sys/mman.h>
void *
mmap(void * addr, size_t len, int prot, int flags, int fildes, off_t off);
The include file <sys/types.h> is needed for this function.
COMPATIBILITY
mmap() now returns with errno set to EINVAL in places that historically succeeded. The rules have changed as follows:
o The flags parameter must specify either MAP_PRIVATE or MAP_SHARED.
o The size parameter must not be 0.
o The off parameter must be a multiple of pagesize, as returned by sysconf().
SEE ALSO
mmap(2), alloca(3), calloc(3), free(3), malloc(3), realloc(3), compat(5)
STANDARDS
These functions, with the exception of alloca() and mmap() conform to ISO/IEC 9899:1990 (``ISO C90'').
BSD
June 4, 1993 BSD