#ifndef CYGONCE_MEMALLOC_MFIXIMPL_HXX #define CYGONCE_MEMALLOC_MFIXIMPL_HXX //========================================================================== // // mfiximpl.hxx // // Memory pool with fixed block class declarations // //========================================================================== //####ECOSGPLCOPYRIGHTBEGIN#### // ------------------------------------------- // This file is part of eCos, the Embedded Configurable Operating System. // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc. // // eCos is free software; you can redistribute it and/or modify it under // the terms of the GNU General Public License as published by the Free // Software Foundation; either version 2 or (at your option) any later version. // // eCos is distributed in the hope that it will be useful, but WITHOUT ANY // WARRANTY; without even the implied warranty of MERCHANTABILITY or // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License // for more details. // // You should have received a copy of the GNU General Public License along // with eCos; if not, write to the Free Software Foundation, Inc., // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. // // As a special exception, if other files instantiate templates or use macros // or inline functions from this file, or you compile this file and link it // with other works to produce a work based on this file, this file does not // by itself cause the resulting work to be covered by the GNU General Public // License. However the source code for this file must still be made available // in accordance with section (3) of the GNU General Public License. // // This exception does not invalidate any other reasons why a work based on // this file might be covered by the GNU General Public License. // // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc. // at http://sources.redhat.com/ecos/ecos-license/ // ------------------------------------------- //####ECOSGPLCOPYRIGHTEND#### //========================================================================== //#####DESCRIPTIONBEGIN#### // // Author(s): hmt // Contributors: jlarmour // Date: 2000-06-12 // Purpose: Define Mfiximpl class interface // Description: Inline class for constructing a fixed block allocator // Usage: #include // // //####DESCRIPTIONEND#### // //========================================================================== #include #include // Common memory allocator infra class Cyg_Mempool_Fixed_Implementation { protected: // these constructors are explicitly disallowed Cyg_Mempool_Fixed_Implementation() {}; // Cyg_Mempool_Fixed_Implementation( Cyg_Mempool_Fixed_Implementation &ref ) // {}; Cyg_Mempool_Fixed_Implementation & operator=( Cyg_Mempool_Fixed_Implementation &ref ) { return ref; }; cyg_uint32 *bitmap; cyg_int32 maptop; cyg_uint8 *mempool; cyg_int32 numblocks; cyg_int32 freeblocks; cyg_int32 blocksize; cyg_int32 firstfree; cyg_uint8 *top; public: // THIS is the public API of memory pools generally that can have the // kernel oriented thread-safe package layer atop. // // The kernel package is a template whose type parameter is one of // these. That is the reason there are superfluous parameters here and // more genereralization than might be expected in a fixed block // allocator. // Constructor: gives the base and size of the arena in which memory is // to be carved out, note that management structures are taken from the // same arena. The alloc_unit may be any other param in general; it // comes through from the outer constructor unchanged. Cyg_Mempool_Fixed_Implementation( cyg_uint8 *base, cyg_int32 size, CYG_ADDRWORD alloc_unit ); // Destructor ~Cyg_Mempool_Fixed_Implementation(); // get some memory; size is ignored in a fixed block allocator cyg_uint8 *try_alloc( cyg_int32 size ); // supposedly resize existing allocation. This is defined in the // fixed block allocator purely for API consistency. It will return // an error (false) for all values, except for the blocksize // returns true on success cyg_uint8 * resize_alloc( cyg_uint8 *alloc_ptr, cyg_int32 newsize, cyg_int32 *oldsize=NULL ); // free the memory back to the pool; size ignored here cyg_bool free( cyg_uint8 *p, cyg_int32 size ); // Get memory pool status // flags is a bitmask of requested fields to fill in. The flags are // defined in common.hxx void get_status( cyg_mempool_status_flag_t /* flags */, Cyg_Mempool_Status & /* status */ ); }; #include // ------------------------------------------------------------------------- #endif // ifndef CYGONCE_MEMALLOC_MFIXIMPL_HXX // EOF mfiximpl.hxx