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1 // Copyright 2010 The Go Authors. All rights reserved.
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2 // Use of this source code is governed by a BSD-style
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3 // license that can be found in the LICENSE file.
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4
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5 #include <assert.h>
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6 #include "life.h"
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7 #include "_cgo_export.h"
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8
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9 const int MYCONST = 0;
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10
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11 // Do the actual manipulation of the life board in C. This could be
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12 // done easily in Go, we are just using C for demonstration
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13 // purposes.
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14 void
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15 Step(int x, int y, int *a, int *n)
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16 {
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17 struct GoStart_return r;
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18
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19 // Use Go to start 4 goroutines each of which handles 1/4 of the
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20 // board.
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21 r = GoStart(0, x, y, 0, x / 2, 0, y / 2, a, n);
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22 assert(r.r0 == 0 && r.r1 == 100); // test multiple returns
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23 r = GoStart(1, x, y, x / 2, x, 0, y / 2, a, n);
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24 assert(r.r0 == 1 && r.r1 == 101); // test multiple returns
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25 GoStart(2, x, y, 0, x / 2, y / 2, y, a, n);
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26 GoStart(3, x, y, x / 2, x, y / 2, y, a, n);
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27 GoWait(0);
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28 GoWait(1);
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29 GoWait(2);
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30 GoWait(3);
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31 }
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32
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33 // The actual computation. This is called in parallel.
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34 void
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35 DoStep(int xdim, int ydim, int xstart, int xend, int ystart, int yend, int *a, int *n)
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36 {
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37 int x, y, c, i, j;
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38
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39 for(x = xstart; x < xend; x++) {
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40 for(y = ystart; y < yend; y++) {
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41 c = 0;
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42 for(i = -1; i <= 1; i++) {
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43 for(j = -1; j <= 1; j++) {
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44 if(x+i >= 0 && x+i < xdim &&
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45 y+j >= 0 && y+j < ydim &&
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46 (i != 0 || j != 0))
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47 c += a[(x+i)*xdim + (y+j)] != 0;
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48 }
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49 }
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50 if(c == 3 || (c == 2 && a[x*xdim + y] != 0))
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51 n[x*xdim + y] = 1;
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52 else
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53 n[x*xdim + y] = 0;
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54 }
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55 }
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56 }
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