#ifndef CYGONCE_MEMALLOC_DLMALLOC_HXX #define CYGONCE_MEMALLOC_DLMALLOC_HXX //========================================================================== // // dlmalloc.hxx // // Interface to the port of Doug Lea's malloc implementation // //========================================================================== //####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): jlarmour // Contributors: // Date: 2000-06-18 // Purpose: Define standard interface to Doug Lea's malloc implementation // Description: Doug Lea's malloc has been ported to eCos. This file provides // the interface between the implementation and the standard // memory allocator interface required by eCos // Usage: #include // // //####DESCRIPTIONEND#### // //========================================================================== // CONFIGURATION #include #ifdef CYGIMP_MEMALLOC_ALLOCATOR_DLMALLOC_THREADAWARE # include # ifdef CYGPKG_KERNEL # include # endif #endif // when used as an implementation for malloc, we need the following // to let the system know the name of the class #define CYGCLS_MEMALLOC_MALLOC_IMPL Cyg_Mempool_dlmalloc // if the implementation is all that's required, don't output anything else #ifndef __MALLOC_IMPL_WANTED // INCLUDES #include // size_t, ptrdiff_t #include // types #ifdef CYGIMP_MEMALLOC_ALLOCATOR_DLMALLOC_THREADAWARE # include // kernel safe mempool template #endif #include // dlmalloc implementation #include // Common memory allocator infra #ifdef CYGFUN_KERNEL_THREADS_TIMER # include // cyg_tick_count #endif // TYPE DEFINITIONS class Cyg_Mempool_dlmalloc { protected: #ifdef CYGIMP_MEMALLOC_ALLOCATOR_DLMALLOC_THREADAWARE Cyg_Mempolt2 mypool; #else Cyg_Mempool_dlmalloc_Implementation mypool; #endif public: // 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. Cyg_Mempool_dlmalloc( cyg_uint8 *base, cyg_int32 size, CYG_ADDRWORD argthru=0 ) : mypool( base, size, argthru ) {} // Destructor ~Cyg_Mempool_dlmalloc() {} // get some memory; wait if none available // if we aren't configured to be thread-aware this is irrelevant #ifdef CYGIMP_MEMALLOC_ALLOCATOR_DLMALLOC_THREADAWARE cyg_uint8 * alloc( cyg_int32 size ) { return mypool.alloc( size ); } # ifdef CYGFUN_KERNEL_THREADS_TIMER // get some memory with a timeout cyg_uint8 * alloc( cyg_int32 size, cyg_tick_count delay_timeout ) { return mypool.alloc( size, delay_timeout ); } # endif #endif // get some memory, return NULL if none available cyg_uint8 * try_alloc( cyg_int32 size ) { return mypool.try_alloc( size ); } // resize existing allocation, if oldsize is non-NULL, previous // allocation size is placed into it. If previous size not available, // it is set to 0. NB previous allocation size may have been rounded up. // Occasionally the allocation can be adjusted *backwards* as well as, // or instead of forwards, therefore the address of the resized // allocation is returned, or NULL if no resizing was possible. // Note that this differs from ::realloc() in that no attempt is // made to call malloc() if resizing is not possible - that is left // to higher layers. The data is copied from old to new though. // The effects of alloc_ptr==NULL or newsize==0 are undefined cyg_uint8 * resize_alloc( cyg_uint8 *alloc_ptr, cyg_int32 newsize, cyg_int32 *oldsize ) { return mypool.resize_alloc( alloc_ptr, newsize, oldsize); } // free the memory back to the pool // returns true on success cyg_bool free( cyg_uint8 *ptr, cyg_int32 size=0 ) { return mypool.free(ptr, 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 ) { // set to 0 - if there's anything really waiting, it will be set to // 1 later status.waiting = 0; mypool.get_status( flags, status ); } }; #endif // ifndef __MALLOC_IMPL_WANTED #endif // ifndef CYGONCE_MEMALLOC_DLMALLOC_HXX // EOF dlmalloc.hxx