gdb/rdi-share/buffers.h

   1 /*
   2  * Copyright (C) 1995 Advanced RISC Machines Limited. All rights reserved.
   3  *
   4  * This software may be freely used, copied, modified, and distributed
   5  * provided that the above copyright notice is preserved in all copies of the
   6  * software.
   7  */
   8
   9 /* -*-C-*-
  10  *
  11  * $Revision$
  12  *     $Date$
  13  *
  14  *
  15  *   Project: ANGEL
  16  *
  17  *     Title: Public interface to buffer management
  18  */
  19
  20 #ifndef angel_buffers_h
  21 #define angel_buffers_h
  22
  23 #include "chandefs.h"           /* CHAN_HEADER_SIZE */
  24
  25
  26 /* the handle to a buffer */
  27 typedef unsigned char *p_Buffer;
  28
  29
  30 /*
  31  * Angel Packets are structured as a fixed size header, followed
  32  * by the packet data
  33  */
  34 #ifdef TARGET
  35 # define BUFFERDATA(b)  (b)     /* channels layer takes care of it */
  36 #else
  37 # define BUFFERDATA(b)  (&((b)[CHAN_HEADER_SIZE]))
  38 #endif
  39
  40
  41 /*
  42  * The buffer management function prototypes are only applicable
  43  * when compiling target code
  44  */
  45 #ifdef TARGET
  46
  47 /*
  48  * Function: Angel_BufferQuerySizes
  49  *  Purpose: Request infomation on the default and maximum buffer sizes
  50  *           that can be allocated
  51  *
  52  *   Params:
  53  *             In/Out: default_size, max_size: pointers to place the
  54  *                     sizes in on return
  55  */
  56
  57 void Angel_BufferQuerySizes(unsigned int *default_size,
  58                             unsigned int *max_size );
  59
  60 /*
  61  * Function: Angel_RxEnginBuffersLeft
  62  *  Purpose: return the number of free buffers
  63  *
  64  *   Params:
  65  *            Returns: number of free buffers
  66  */
  67 unsigned int Angel_BuffersLeft( void );
  68
  69 /*
  70  * Function: Angel_BufferAlloc
  71  *  Purpose: allocate a buffer that is at least req_size bytes long
  72  *
  73  *   Params:
  74  *              Input: req_size     the required size of the buffer
  75  *
  76  *              Returns: pointer to the buffer NULL if unable to
  77  *                       fulfil the request
  78  */
  79 p_Buffer     Angel_BufferAlloc(unsigned int  req_size);
  80
  81 /*
  82  * Function: Angel_BufferRelease
  83  *  Purpose: release a buffer back to the free pool
  84  *
  85  *   Params:
  86  *              Input: pointer to the buffer to free
  87  */
  88 void Angel_BufferRelease(p_Buffer buffer);
  89
  90
  91 /* return values for angel_InitBuffers */
  92 typedef enum buf_init_error{
  93   INIT_BUF_OK,
  94   INIT_BUF_FAIL
  95 } buf_init_error;
  96
  97 /*
  98  * Function: Angel_InitBuffers
  99  *  Purpose: Initalised and malloc the buffer pool
 100  *
 101  *   Params:
 102  *              Returns: see above
 103  */
 104
 105 buf_init_error  Angel_InitBuffers(void);
 106
 107 #endif /* def TARGET */
 108
 109 #endif /* ndef angel_buffers_h */
 110
 111 /* EOF buffers.h */