1 #ifndef CYGONCE_MEMALLOC_MEMPOLT2_HXX
2 #define CYGONCE_MEMALLOC_MEMPOLT2_HXX
4 //==========================================================================
8 // Mempolt2 (Memory pool template) class declarations
10 //==========================================================================
11 //####ECOSGPLCOPYRIGHTBEGIN####
12 // -------------------------------------------
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41 // -------------------------------------------
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43 //==========================================================================
44 //#####DESCRIPTIONBEGIN####
47 // Contributors: jlarmour
49 // Purpose: Define Mempolt2 class interface
50 // Description: The class defined here provides the APIs for thread-safe,
51 // kernel-savvy memory managers; make a class with the
52 // underlying allocator as the template parameter.
53 // Usage: #include <cyg/memalloc/mempolt2.hxx>
56 //####DESCRIPTIONEND####
58 //==========================================================================
60 // It is assumed that implementations using this file have already mandated
61 // that the kernel is present. So we just go ahead and use it
63 #include <pkgconf/memalloc.h>
64 #include <cyg/kernel/ktypes.h>
65 #include <cyg/infra/cyg_ass.h> // assertion macros
66 #include <cyg/kernel/thread.hxx>
67 #include <cyg/memalloc/common.hxx> // Common memory allocator infra
73 T pool; // underlying memory manager
74 Cyg_ThreadQueue queue; // queue of waiting threads
76 class Mempolt2WaitInfo {
82 Mempolt2WaitInfo( cyg_int32 allocsize )
83 { size = allocsize; addr = 0; }
91 CYG_ADDRWORD arg_thru ); // Constructor
92 ~Cyg_Mempolt2(); // Destructor
94 // get some memory; wait if none available; return NULL if failed
96 cyg_uint8 *alloc( cyg_int32 size );
98 #ifdef CYGFUN_KERNEL_THREADS_TIMER
99 // get some memory with a timeout; return NULL if failed
100 // due to interrupt or timeout
101 cyg_uint8 *alloc( cyg_int32 size, cyg_tick_count abs_timeout );
104 // get some memory, return NULL if none available
105 cyg_uint8 *try_alloc( cyg_int32 size );
107 // resize existing allocation, if oldsize is non-NULL, previous
108 // allocation size is placed into it. If previous size not available,
109 // it is set to 0. NB previous allocation size may have been rounded up.
110 // Occasionally the allocation can be adjusted *backwards* as well as,
111 // or instead of forwards, therefore the address of the resized
112 // allocation is returned, or NULL if no resizing was possible.
113 // Note that this differs from ::realloc() in that no attempt is
114 // made to call malloc() if resizing is not possible - that is left
115 // to higher layers. The data is copied from old to new though.
116 // The effects of alloc_ptr==NULL or newsize==0 are undefined
118 resize_alloc( cyg_uint8 *alloc_ptr, cyg_int32 newsize,
119 cyg_int32 *oldsize );
121 // free the memory back to the pool
122 // returns true on success
123 cyg_bool free( cyg_uint8 *p, cyg_int32 size );
125 // Get memory pool status
126 // flags is a bitmask of requested fields to fill in. The flags are
127 // defined in common.hxx
128 void get_status( cyg_mempool_status_flag_t flags,
129 Cyg_Mempool_Status &status );
131 CYGDBG_DEFINE_CHECK_THIS
135 #include <cyg/memalloc/mempolt2.inl>
137 // -------------------------------------------------------------------------
138 #endif // ifndef CYGONCE_MEMALLOC_MEMPOLT2_HXX