git.m6w6.name Git - m6w6/libmemcached/blob - docs/memcached_memory_allocators.rst

   1 ========================================
   2 Use custom allocators for embedded usage
   3 ========================================
   4
   5 .. index:: object: memcached_st
   6
   7 Manage memory allocator functions
   8
   9 --------
  10 SYNOPSIS
  11 --------
  12
  13
  14 #include <libmemcached/memcached.h>
  15
  16 .. c:function:: memcached_return_t memcached_set_memory_allocators (memcached_st *ptr, memcached_malloc_fn mem_malloc, memcached_free_fn mem_free, memcached_realloc_fn mem_realloc, memcached_calloc_fn mem_calloc, void *context);
  17
  18 .. c:function:: void memcached_get_memory_allocators (memcached_st *ptr, memcached_malloc_fn *mem_malloc, memcached_free_fn *mem_free, memcached_realloc_fn *mem_realloc, memcached_calloc_fn *mem_calloc);
  19
  20 .. c:function:: void * memcached_get_memory_allocators_context(const memcached_st *ptr);
  21
  22 .. c:function:: void * (*memcached_malloc_fn) (memcached_st *ptr, const size_t size, void *context);
  23
  24 .. c:function:: void * (*memcached_realloc_fn) (memcached_st *ptr, void *mem, const size_t size, void *context);
  25
  26 .. c:function:: void (*memcached_free_fn) (memcached_st *ptr, void *mem, void *context);
  27
  28 .. c:function:: void * (*memcached_calloc_fn) (memcached_st *ptr, size_t nelem, const size_t elsize, void *context);
  29
  30 Compile and link with -lmemcached
  31
  32
  33
  34 -----------
  35 DESCRIPTION
  36 -----------
  37
  38
  39 libmemcached(3) allows you to specify your own memory allocators, optimized
  40 for your application. This enables libmemcached to be used inside of applications that have their own malloc implementation.
  41
  42 memcached_set_memory_allocators() is used to set the memory allocators used
  43 by the memcached instance specified by ptr. Please note that you cannot
  44 override only one of the memory allocators, you have to specify a complete
  45 new set if you want to override one of them. All of the memory allocation
  46 functions should behave as specified in the C99 standard. Specify NULL as
  47 all functions to reset them to the default values.
  48
  49 memcached_get_memory_allocators() is used to get the currently used memory
  50 allocators by a mamcached handle.
  51
  52 memcached_get_memory_allocators_context() returns the void \* that was
  53 passed in during the call to memcached_set_memory_allocators().
  54
  55 The first argument to the memory allocator functions is a pointer to a
  56 memcached structure, the is passed as const and you will need to clone
  57 it in order to make use of any operation which would modify it.
  58
  59
  60 -----
  61 NOTES
  62 -----
  63
  64
  65 In version 0.38 all functions were modified to have a context void pointer
  66 passed to them. This was so that customer allocators could have their
  67 own space for memory.
  68
  69
  70 ------
  71 RETURN
  72 ------
  73
  74
  75 memcached_set_memory_allocators() return MEMCACHED_SUCCESS upon success,
  76 and MEMCACHED_FAILURE if you don't pass a complete set of function pointers.
  77
  78
  79 ----
  80 HOME
  81 ----
  82
  83
  84 To find out more information please check:
  85 `http://libmemcached.org/ <http://libmemcached.org/>`_
  86
  87
  88 --------
  89 SEE ALSO
  90 --------
  91
  92 :manpage:`memcached(1)` :manpage:`libmemcached(3)` :manpage:`memcached_strerror(3)`