FEI Version of the Day
fei_Pool.cpp
00001 /*
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00004 //             FEI: Finite Element Interface to Linear Solvers
00005 //                  Copyright (2005) Sandia Corporation.
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00041 */
00042 
00043 
00044 #include "fei_macros.hpp"
00045 #include "fei_Pool.hpp"
00046 
00047 fei_Pool::fei_Pool(unsigned int sz)
00048  : chunks(NULL),
00049    esize(sz<sizeof(Link) ? sizeof(Link) : sz),
00050    head(NULL)
00051 {
00052 }
00053 
00054 fei_Pool::~fei_Pool()
00055 {
00056   //free all chunks
00057   Chunk* n = chunks;
00058   while(n) {
00059     Chunk* p = n;
00060     n = n->next;
00061     delete p;
00062   }
00063 }
00064 
00065 void
00066 fei_Pool::grow()
00067 {
00068   //allocate new chunk, organize it as a linked list of elements of size 'esize'
00069   Chunk* n = new Chunk;
00070   n->next = chunks;
00071   chunks = n;
00072 
00073   const int nelem = Chunk::size/esize;
00074   char* start = n->mem;
00075   char* last = &start[ (nelem-1)*esize ];
00076   for(char* p=start; p<last; p+=esize) {
00077     reinterpret_cast<Link*>(p)->next = reinterpret_cast<Link*>(p+esize);
00078   }
00079   reinterpret_cast<Link*>(last)->next = NULL;
00080   head = reinterpret_cast<Link*>(start);
00081 }
00082 
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