1 #ifndef CYGONCE_MEMALLOC_MEMFIXED_HXX
2 #define CYGONCE_MEMALLOC_MEMFIXED_HXX
4 //==========================================================================
8 // Memory pool with fixed block class declarations
10 //==========================================================================
11 //####ECOSGPLCOPYRIGHTBEGIN####
12 // -------------------------------------------
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41 // -------------------------------------------
42 //####ECOSGPLCOPYRIGHTEND####
43 //==========================================================================
44 //#####DESCRIPTIONBEGIN####
47 // Contributors: jlarmour
49 // Purpose: Define Memfixed class interface
50 // Description: Inline class for constructing a fixed block allocator
51 // Usage: #include <cyg/memalloc/memfixed.hxx>
54 //####DESCRIPTIONEND####
56 //==========================================================================
60 #include <pkgconf/memalloc.h>
61 #ifdef CYGSEM_MEMALLOC_ALLOCATOR_FIXED_THREADAWARE
62 # include <pkgconf/system.h>
64 # include <pkgconf/kernel.h>
71 #include <cyg/infra/cyg_type.h> // types
72 #include <cyg/infra/cyg_ass.h> // assertion macros
74 #ifdef CYGFUN_KERNEL_THREADS_TIMER
75 # include <cyg/kernel/ktypes.h> // cyg_tick_count
78 #ifdef CYGSEM_MEMALLOC_ALLOCATOR_FIXED_THREADAWARE
79 # include <cyg/memalloc/mempolt2.hxx> // kernel safe mempool template
82 #include <cyg/memalloc/mfiximpl.hxx> // implementation of a fixed mem pool
83 #include <cyg/memalloc/common.hxx> // Common memory allocator infra
88 class Cyg_Mempool_Fixed
91 #ifdef CYGSEM_MEMALLOC_ALLOCATOR_FIXED_THREADAWARE
92 Cyg_Mempolt2<Cyg_Mempool_Fixed_Implementation> mypool;
94 Cyg_Mempool_Fixed_Implementation mypool;
98 // this API makes concrete a class which implements a thread-safe
99 // kernel-savvy memory pool which manages fixed size blocks.
101 // Constructor: gives the base and size of the arena in which memory is
102 // to be carved out, note that management structures are taken from the
103 // same arena. Alloc_unit is the blocksize allocated.
105 cyg_uint8 * /* base */,
106 cyg_int32 /* size */,
107 CYG_ADDRWORD /* alloc_unit */ );
110 ~Cyg_Mempool_Fixed();
112 #ifdef CYGSEM_MEMALLOC_ALLOCATOR_FIXED_THREADAWARE
113 // get some memory; wait if none available
116 # ifdef CYGFUN_KERNEL_THREADS_TIMER
117 // get some memory with a timeout
118 cyg_uint8 *alloc( cyg_tick_count /* delay_timeout */ );
122 // get some memory, return NULL if none available
123 cyg_uint8 *try_alloc();
125 // supposedly resize existing allocation. This is defined in the
126 // fixed block allocator purely for API consistency. It will return
127 // an error (false) for all values, except for the blocksize
128 // returns true on success
130 resize_alloc( cyg_uint8 * /* alloc_ptr */, cyg_int32 /* newsize */,
131 cyg_int32 * /* oldsize */ =NULL );
133 // free the memory back to the pool
134 cyg_bool free( cyg_uint8 * /* p */ );
136 // Get memory pool status
137 // flags is a bitmask of requested fields to fill in. The flags are
138 // defined in common.hxx
139 void get_status( cyg_mempool_status_flag_t /* flags */,
140 Cyg_Mempool_Status & /* status */ );
142 CYGDBG_DEFINE_CHECK_THIS
145 #endif // ifndef CYGONCE_MEMALLOC_MEMFIXED_HXX