release/src/router/mysql/storage/ndb/src/kernel/vm/LongSignal.hpp

   1 /* Copyright (c) 2003-2005 MySQL AB
   2
   3    This program is free software; you can redistribute it and/or modify
   4    it under the terms of the GNU General Public License as published by
   5    the Free Software Foundation; version 2 of the License.
   6
   7    This program is distributed in the hope that it will be useful,
   8    but WITHOUT ANY WARRANTY; without even the implied warranty of
   9    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10    GNU General Public License for more details.
  11
  12    You should have received a copy of the GNU General Public License
  13    along with this program; if not, write to the Free Software
  14    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA */
  15
  16 #ifndef LONG_SIGNAL_HPP
  17 #define LONG_SIGNAL_HPP
  18
  19 #include "pc.hpp"
  20 #include <ArrayPool.hpp>
  21
  22 /**
  23  * Section handling
  24  */
  25 struct SectionSegment {
  26
  27   STATIC_CONST( DataLength = NDB_SECTION_SEGMENT_SZ );
  28
  29   Uint32 m_ownerRef;
  30   Uint32 m_sz;
  31   Uint32 m_lastSegment;
  32   union {
  33     Uint32 m_nextSegment;
  34     Uint32 nextPool;
  35   };
  36   Uint32 theData[DataLength];
  37 };
  38
  39 /**
  40  * Pool for SectionSegments
  41  */
  42 class SectionSegmentPool : public ArrayPool<SectionSegment> {};
  43
  44 /**
  45  * And the instance
  46  */
  47 extern SectionSegmentPool g_sectionSegmentPool;
  48
  49 /**
  50  * Function prototypes
  51  */
  52 void print(SegmentedSectionPtr ptr, FILE* out);
  53 void copy(SegmentedSectionPtr dst, Uint32 * src, Uint32 len);
  54 void copy(Uint32 * dst, SegmentedSectionPtr src);
  55 bool import(Ptr<SectionSegment> & first, const Uint32 * src, Uint32 len);
  56
  57 extern class SectionSegmentPool g_sectionSegmentPool;
  58 void getSection(SegmentedSectionPtr & ptr, Uint32 id);
  59 void linkSegments(Uint32 head, Uint32 tail);
  60
  61 void getSections(Uint32 secCount, SegmentedSectionPtr ptr[3]);
  62 void releaseSections(Uint32 secCount, SegmentedSectionPtr ptr[3]);
  63
  64
  65 #include "DataBuffer.hpp"
  66
  67 template<Uint32 sz>
  68 void
  69 append(DataBuffer<sz>& dst, SegmentedSectionPtr ptr, SectionSegmentPool& pool){
  70   Uint32 len = ptr.sz;
  71   while(len > SectionSegment::DataLength){
  72     dst.append(ptr.p->theData, SectionSegment::DataLength);
  73     ptr.p = pool.getPtr(ptr.p->m_nextSegment);
  74     len -= SectionSegment::DataLength;
  75   }
  76   dst.append(ptr.p->theData, len);
  77 }
  78
  79 #endif