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
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+//==========================================================================
+//
+//      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