memcached_set_memory_allocators_context - libmemcached Documentation

libmemcached allows you to specify your own memory allocators, optimized for your application. This enables libmemcached to be used inside of applications that have their own malloc implementation. memcached_set_memory_allocators() is used to set the memory allocators used by the memcached instance specified by ptr. Please note that you cannot override only one of the memory allocators, you have to specify a complete new set if you want to override one of them. All of the memory allocation functions should behave as specified in the C99 standard. Specify NULL as all functions to reset them to the default values. memcached_get_memory_allocators() is used to get the currently used memory allocators by a memcached handle. memcached_get_memory_allocators_context() returns the void * that was passed in during the call to memcached_set_memory_allocators(). The first argument to the memory allocator functions is a pointer to a memcached structure, the is passed as const and you will need to clone it in order to make use of any operation which would modify it.

memcached_set_memory_allocators_context - libmemcached Documentation Manage memory allocator functions

In version 0.38 all functions were modified to have a context void pointer passed to them. This was so that custom allocators could have their own space for memory.

memcached_set_memory_allocators() returns MEMCACHED_SUCCESS upon success, and MEMCACHED_FAILURE if you don't pass a complete set of function pointers.

memcached(1)libmemcached(3)memcached_strerror(3) 1.1 Mar 31, 2024 MEMCACHED_SET_MEMORY_ALLOCATORS_CONTEXT(3)

#include<libmemcached/memcached.h> Compile and link with -lmemcached memcached_return_tmemcached_set_memory_allocators(memcached_st*ptr,memcached_malloc_fnmem_malloc,memcached_free_fnmem_free,memcached_realloc_fnmem_realloc,memcached_calloc_fnmem_calloc,void*context)Parameters • ptr -- pointer to an initialized memcached_st struct • mem_malloc -- pointer to a memcached_malloc_fn callback • mem_free -- pointer to a memcached_free_fn callback • mem_realloc -- pointer to a memcached_realloc_fn callback • mem_calloc -- pointer to a memcached_calloc_fn callback • context -- pointer to a user supplied context Returnsmemcached_return_t indicating success voidmemcached_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)Parameters • ptr -- pointer to an initialized memcached_st struct • mem_malloc -- pointer to store the address of the memcached_malloc_fn callback • mem_free -- pointer to store the address of the memcached_free_fn callback • mem_realloc -- pointer to store the address of the memcached_realloc_fn callback • mem_calloc -- pointer to store the address of the memcached_calloc_fn callback void*memcached_get_memory_allocators_context(constmemcached_st*ptr)Parametersptr -- pointer to an initialized memcached_st struct Returns pointer to the user supplied context typedefvoid*(*memcached_malloc_fn)(memcached_st*ptr,constsize_tsize,void*context)Paramptr pointer to an initialized memcached_st struct Paramsize the number of bytes to allocate Paramcontext pointer to the user supplied context Returns pointer to at least size bytes of allocated memory typedefvoid*(*memcached_realloc_fn)(memcached_st*ptr,void*mem,constsize_tsize,void*context)Paramptr pointer to an initialized memcached_st struct Parammem pointer to previously allocated memory Paramsize the number of bytes to allocate Paramcontext pointer to the user supplied context Returns pointer to at least size bytes of allocated memory typedefvoid(*memcached_free_fn)(memcached_st*ptr,void*mem,void*context)Paramptr pointer to an initialized memcached_st struct Parammem pointer to previously allocated memory Paramcontext pointer to the user supplied context typedefvoid*(*memcached_calloc_fn)(memcached_st*ptr,size_tnelem,constsize_telsize,void*context)Paramptr pointer to an initialized memcached_st struct Paramnelem number of elements to allocate Paramelsize the number of bytes to allocate per element Paramcontext pointer to the user supplied context Returns pointer to at least elsize * nelem bytes of allocated and zeroed memory