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49 lines
1.1 KiB
C++
49 lines
1.1 KiB
C++
#include "MatchBoxPC.h"
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//TODO parallelize this
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///Find the owner of a ghost node:
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MilanInt findOwnerOfGhost(MilanLongInt vtxIndex, MilanLongInt *mVerDistance,
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MilanInt myRank, MilanInt numProcs) {
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//MilanLongInt Size = mVerDistance.size();
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MilanLongInt mStartInd = mVerDistance[myRank];
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MilanInt Start = 0;
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MilanInt End = numProcs;
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MilanInt Current = 0;
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#if 0
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if ( vtxIndex < mStartInd )
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End = myRank;
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else
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Start = myRank;
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#endif
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while ( Start <= End ) {
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Current = (End + Start)/2;
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//CASE-1:
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if ( mVerDistance[Current] == vtxIndex ) {
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while ( mVerDistance[Current+1] == vtxIndex ) {
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Current++;
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if ( Current == numProcs )
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return (-1);
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}
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return (Current);
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}
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else { //CASE 2:
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if ( mVerDistance[Current] > vtxIndex )
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End = Current - 1;
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else //CASE 3:
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Start = Current + 1;
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}
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} //End of While()
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if ( Current == 0 )
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return (Current);
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else {
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if ( mVerDistance[Current] > vtxIndex )
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return (Current-1);
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else
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return (Current);
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} //End of else
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return (-1); //It should not reach here!
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} //End of findOwnerOfGhost()
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