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__gnu_cxx::__pool_alloc_base(3) Library Functions Manual __gnu_cxx::__pool_alloc_base(3)

NAME

__gnu_cxx::__pool_alloc_base - Base class for __pool_alloc.

SYNOPSIS

Inherited by __gnu_cxx::__pool_alloc< _Tp > [private].

Protected Types


enum { _S_align }
enum { _S_max_bytes }
enum { _S_free_list_size }

Protected Member Functions


char * _M_allocate_chunk (size_t __n, int &__nobjs)
_Obj *volatile * _M_get_free_list (size_t __bytes) throw ()
__mutex & _M_get_mutex () throw ()
void * _M_refill (size_t __n)
size_t _M_round_up (size_t __bytes)

Static Protected Attributes


static char * _S_end_free
static _Obj *volatile _S_free_list [_S_free_list_size]
static size_t _S_heap_size
static char * _S_start_free

Detailed Description

Base class for __pool_alloc.

Uses various allocators to fulfill underlying requests (and makes as few requests as possible when in default high-speed pool mode).

Important implementation properties: 0. If globally mandated, then allocate objects from new

1.
If the clients request an object of size > _S_max_bytes, the resulting object will be obtained directly from new
2.
In all other cases, we allocate an object of size exactly _S_round_up(requested_size). Thus the client has enough size information that we can return the object to the proper free list without permanently losing part of the object.

Author

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Mon Dec 18 2023 libstdc++