ADTaaron-thesisarm-ehast-experimentalcleanup-dtorsdeferred_resndemanglerenumforall-pointer-decayjacob/cs343-translationjenkins-sandboxnew-astnew-ast-unique-exprnew-envno_listpersistent-indexerpthread-emulationqualifiedEnumresolv-newwith_gc
Last change
on this file since b8a17e2 was
b8a17e2,
checked in by Peter A. Buhr <pabuhr@…>, 7 years ago
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add concurrency test to concurrently add rows of matrix
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-
Property mode set to
100644
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File size:
1.1 KB
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1 | #include <fstream> |
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2 | #include <kernel> |
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3 | #include <thread> |
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4 | |
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5 | thread Adder { |
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6 | int * row, cols, * subtotal; // communication |
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7 | }; |
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8 | |
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9 | void ?{}( Adder & adder, int row[], int cols, int & subtotal ) { |
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10 | adder.row = row; |
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11 | adder.cols = cols; |
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12 | adder.subtotal = &subtotal; |
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13 | } |
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14 | |
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15 | void main( Adder & adder ) { |
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16 | *adder.subtotal = 0; |
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17 | for ( int c = 0; c < adder.cols; c += 1 ) { |
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18 | *adder.subtotal += adder.row[c]; |
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19 | } // for |
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20 | } |
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21 | |
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22 | int main() { |
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23 | const int rows = 10, cols = 1000; |
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24 | int matrix[rows][cols], subtotals[rows], total = 0; |
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25 | processor p; // extra kernel thread |
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26 | |
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27 | for ( int r = 0; r < rows; r += 1 ) { |
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28 | for ( int c = 0; c < cols; c += 1 ) { |
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29 | matrix[r][c] = 1; |
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30 | } // for |
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31 | } // for |
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32 | Adder * adders[rows]; |
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33 | for ( int r = 0; r < rows; r += 1 ) { // start threads to sum rows |
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34 | adders[r] = &(*malloc()){ matrix[r], cols, subtotals[r] }; |
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35 | // adders[r] = new( matrix[r], cols, &subtotals[r] ); |
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36 | } // for |
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37 | for ( int r = 0; r < rows; r += 1 ) { // wait for threads to finish |
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38 | delete( adders[r] ); |
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39 | total += subtotals[r]; // total subtotals |
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40 | } // for |
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41 | sout | total | endl; |
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42 | } |
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