1 //==========================================================================
5 // Memory pool with fixed block class declarations
7 //==========================================================================
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40 //==========================================================================
41 //#####DESCRIPTIONBEGIN####
44 // Contributors: jlarmour
46 // Purpose: Define Memfixed class interface
47 // Description: Inline class for constructing a fixed block allocator
48 // Usage: #include <cyg/memalloc/memfixed.hxx>
51 //####DESCRIPTIONEND####
53 //==========================================================================
57 #include <pkgconf/memalloc.h>
58 #include <pkgconf/system.h>
60 # include <pkgconf/kernel.h>
66 #include <cyg/infra/cyg_type.h> // types
67 #include <cyg/infra/cyg_ass.h> // assertion macros
68 #include <cyg/infra/cyg_trac.h> // tracing macros
70 #ifdef CYGFUN_KERNEL_THREADS_TIMER
71 # include <cyg/kernel/ktypes.h> // cyg_tick_count
74 #ifdef CYGSEM_MEMALLOC_ALLOCATOR_FIXED_THREADAWARE
75 // tell it to optimize for the fixed block one-to-one case
76 # define CYGIMP_MEM_T_ONEFREE_TO_ONEALLOC
77 # include <cyg/memalloc/mempolt2.hxx> // kernel safe mempool template
80 #include <cyg/memalloc/memfixed.hxx>
81 #include <cyg/memalloc/mfiximpl.hxx> // implementation of a fixed mem pool
82 #include <cyg/memalloc/common.hxx> // Common memory allocator infra
84 // -------------------------------------------------------------------------
85 // debugging/assert function
87 #ifdef CYGDBG_USE_ASSERTS
89 Cyg_Mempool_Fixed::check_this(cyg_assert_class_zeal zeal) const
91 CYG_REPORT_FUNCTION();
92 // check that we have a non-NULL pointer first
93 if( this == NULL ) return false;
94 #ifdef CYGSEM_MEMALLOC_ALLOCATOR_FIXED_THREADAWARE
95 return mypool.check_this( zeal );
102 // -------------------------------------------------------------------------
103 // Constructor: gives the base and size of the arena in which memory is
104 // to be carved out, note that management structures are taken from the
105 // same arena. Alloc_unit is the blocksize allocated.
106 Cyg_Mempool_Fixed::Cyg_Mempool_Fixed(
109 CYG_ADDRWORD alloc_unit )
110 : mypool( base, size, alloc_unit )
115 Cyg_Mempool_Fixed::~Cyg_Mempool_Fixed()
119 // -------------------------------------------------------------------------
120 // get some memory; wait if none available
121 #ifdef CYGSEM_MEMALLOC_ALLOCATOR_FIXED_THREADAWARE
123 Cyg_Mempool_Fixed::alloc()
125 return mypool.alloc( 0 );
128 # ifdef CYGFUN_KERNEL_THREADS_TIMER
129 // get some memory with a timeout
131 Cyg_Mempool_Fixed::alloc(cyg_tick_count delay_timeout )
133 return mypool.alloc( 0, delay_timeout );
138 // get some memory, return NULL if none available
140 Cyg_Mempool_Fixed::try_alloc()
142 return mypool.try_alloc( 0 );
145 // free the memory back to the pool
147 Cyg_Mempool_Fixed::free( cyg_uint8 *p )
149 return mypool.free( p, 0 );
152 // supposedly resize existing allocation. This is defined in the
153 // fixed block allocator purely for API consistency. It will return
154 // an error (false) for all values, except for the blocksize
155 // returns true on success
157 Cyg_Mempool_Fixed::resize_alloc( cyg_uint8 *alloc_ptr, cyg_int32 newsize,
160 return mypool.resize_alloc( alloc_ptr, newsize, oldsize );
163 // Get memory pool status
165 Cyg_Mempool_Fixed::get_status( cyg_mempool_status_flag_t flags,
166 Cyg_Mempool_Status &status )
168 // set to 0 - if there's anything really waiting, it will be set to
172 return mypool.get_status( flags, status );
175 // -------------------------------------------------------------------------
177 // End of memfixed.cxx