netwerk/base/src/nsNetSegmentUtils.h

   1 /* ***** BEGIN LICENSE BLOCK *****
   2  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
   3  *
   4  * The contents of this file are subject to the Mozilla Public License Version
   5  * 1.1 (the "License"); you may not use this file except in compliance with
   6  * the License. You may obtain a copy of the License at
   7  * http://www.mozilla.org/MPL/
   8  *
   9  * Software distributed under the License is distributed on an "AS IS" basis,
  10  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  11  * for the specific language governing rights and limitations under the
  12  * License.
  13  *
  14  * The Original Code is Mozilla.
  15  *
  16  * The Initial Developer of the Original Code is
  17  * Netscape Communications Corporation.
  18  * Portions created by the Initial Developer are Copyright (C) 2002
  19  * the Initial Developer. All Rights Reserved.
  20  *
  21  * Contributor(s):
  22  *   Darin Fisher <darin@netscape.com>
  23  *
  24  * Alternatively, the contents of this file may be used under the terms of
  25  * either the GNU General Public License Version 2 or later (the "GPL"), or
  26  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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  35  *
  36  * ***** END LICENSE BLOCK ***** */
  37
  38 #ifndef nsNetSegmentUtils_h__
  39 #define nsNetSegmentUtils_h__
  40
  41 #include "necko-config.h"
  42 #include "nsIOService.h"
  43
  44 #ifdef NECKO_SMALL_BUFFERS
  45 #define NET_DEFAULT_SEGMENT_SIZE  2048
  46 #define NET_DEFAULT_SEGMENT_COUNT 4
  47 #else
  48 #define NET_DEFAULT_SEGMENT_SIZE  4096
  49 #define NET_DEFAULT_SEGMENT_COUNT 16
  50 #endif
  51
  52 /**
  53  * returns preferred allocator for given segment size.  NULL implies
  54  * system allocator.  this result can be used when allocating a pipe.
  55  */
  56 static inline nsIMemory *
  57 net_GetSegmentAlloc(PRUint32 segsize)
  58 {
  59     return (segsize == NET_DEFAULT_SEGMENT_SIZE)
  60                      ? nsIOService::gBufferCache
  61                      : nsnull;
  62 }
  63
  64 /**
  65  * applies defaults to segment params in a consistent way.
  66  */
  67 static inline void
  68 net_ResolveSegmentParams(PRUint32 &segsize, PRUint32 &segcount)
  69 {
  70     if (!segsize)
  71         segsize = NET_DEFAULT_SEGMENT_SIZE;
  72     if (!segcount)
  73         segcount = NET_DEFAULT_SEGMENT_COUNT;
  74 }
  75
  76 #endif // !nsNetSegmentUtils_h__