Mercurial > ecos-v2_0-branch
diff packages/services/memalloc/common/current/src/memfixed.cxx @ 115:6ed91473a1cd ecos-sw-2000-08-21
Merge from eCos master repository on 2000-08-21-22:40:54-BST
| author | jlarmour |
|---|---|
| date | Fri, 25 Aug 2000 17:32:38 +0000 |
| parents | |
| children | e0c0827131d1 |
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new file mode 100644 --- /dev/null +++ b/packages/services/memalloc/common/current/src/memfixed.cxx @@ -0,0 +1,168 @@ +//========================================================================== +// +// memfixed.cxx +// +// Memory pool with fixed block class declarations +// +//========================================================================== +//####COPYRIGHTBEGIN#### +// +// ------------------------------------------- +// The contents of this file are subject to the Red Hat eCos Public License +// Version 1.1 (the "License"); you may not use this file except in +// compliance with the License. You may obtain a copy of the License at +// http://www.redhat.com/ +// +// Software distributed under the License is distributed on an "AS IS" +// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the +// License for the specific language governing rights and limitations under +// the License. +// +// The Original Code is eCos - Embedded Configurable Operating System, +// released September 30, 1998. +// +// The Initial Developer of the Original Code is Red Hat. +// Portions created by Red Hat are +// Copyright (C) 1998, 1999, 2000 Red Hat, Inc. +// All Rights Reserved. +// ------------------------------------------- +// +//####COPYRIGHTEND#### +//========================================================================== +//#####DESCRIPTIONBEGIN#### +// +// Author(s): hmt +// Contributors: jlarmour +// Date: 2000-06-16 +// Purpose: Define Memfixed class interface +// Description: Inline class for constructing a fixed block allocator +// Usage: #include <cyg/memalloc/memfixed.hxx> +// +// +//####DESCRIPTIONEND#### +// +//========================================================================== + +// CONFIGURATION + +#include <pkgconf/memalloc.h> +#include <pkgconf/system.h> +#ifdef CYGPKG_KERNEL +# include <pkgconf/kernel.h> +#endif + + +// INCLUDES + +#include <cyg/infra/cyg_type.h> // types +#include <cyg/infra/cyg_ass.h> // assertion macros +#include <cyg/infra/cyg_trac.h> // tracing macros + +#ifdef CYGFUN_KERNEL_THREADS_TIMER +# include <cyg/kernel/ktypes.h> // cyg_tick_count +#endif + +#ifdef CYGSEM_MEMALLOC_ALLOCATOR_FIXED_THREADAWARE +// tell it to optimize for the fixed block one-to-one case +# define CYGIMP_MEM_T_ONEFREE_TO_ONEALLOC +# include <cyg/memalloc/mempolt2.hxx> // kernel safe mempool template +#endif + +#include <cyg/memalloc/memfixed.hxx> +#include <cyg/memalloc/mfiximpl.hxx> // implementation of a fixed mem pool +#include <cyg/memalloc/common.hxx> // Common memory allocator infra + +// ------------------------------------------------------------------------- +// debugging/assert function + +#ifdef CYGDBG_USE_ASSERTS +cyg_bool +Cyg_Mempool_Fixed::check_this(cyg_assert_class_zeal zeal) const +{ + CYG_REPORT_FUNCTION(); + // check that we have a non-NULL pointer first + if( this == NULL ) return false; +#ifdef CYGSEM_MEMALLOC_ALLOCATOR_FIXED_THREADAWARE + return mypool.check_this( zeal ); +#else + return true; +#endif +} +#endif + +// ------------------------------------------------------------------------- +// 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. Alloc_unit is the blocksize allocated. +Cyg_Mempool_Fixed::Cyg_Mempool_Fixed( + cyg_uint8 *base, + cyg_int32 size, + CYG_ADDRWORD alloc_unit ) + : mypool( base, size, alloc_unit ) +{ +} + +// Destructor +Cyg_Mempool_Fixed::~Cyg_Mempool_Fixed() +{ +} + +// ------------------------------------------------------------------------- +// get some memory; wait if none available +#ifdef CYGSEM_MEMALLOC_ALLOCATOR_FIXED_THREADAWARE +cyg_uint8 * +Cyg_Mempool_Fixed::alloc() +{ + return mypool.alloc( 0 ); +} + +# ifdef CYGFUN_KERNEL_THREADS_TIMER +// get some memory with a timeout +cyg_uint8 * +Cyg_Mempool_Fixed::alloc(cyg_tick_count delay_timeout ) +{ + return mypool.alloc( 0, delay_timeout ); +} +# endif +#endif + +// get some memory, return NULL if none available +cyg_uint8 * +Cyg_Mempool_Fixed::try_alloc() +{ + return mypool.try_alloc( 0 ); +} + +// free the memory back to the pool +cyg_bool +Cyg_Mempool_Fixed::free( cyg_uint8 *p ) +{ + return mypool.free( p, 0 ); +} + +// 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 * +Cyg_Mempool_Fixed::resize_alloc( cyg_uint8 *alloc_ptr, cyg_int32 newsize, + cyg_int32 *oldsize=NULL ) +{ + return mypool.resize_alloc( alloc_ptr, newsize, oldsize ); +} + +// Get memory pool status +void +Cyg_Mempool_Fixed::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; + + return mypool.get_status( flags, status ); +} + +// ------------------------------------------------------------------------- + +// End of memfixed.cxx
