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- // Copyright 2010 The Go Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style
- // license that can be found in the LICENSE file.
- #include <assert.h>
- #include "life.h"
- #include "_cgo_export.h"
- const int MYCONST = 0;
- // Do the actual manipulation of the life board in C. This could be
- // done easily in Go, we are just using C for demonstration
- // purposes.
- void
- Step(int x, int y, int *a, int *n)
- {
- struct GoStart_return r;
- // Use Go to start 4 goroutines each of which handles 1/4 of the
- // board.
- r = GoStart(0, x, y, 0, x / 2, 0, y / 2, a, n);
- assert(r.r0 == 0 && r.r1 == 100); // test multiple returns
- r = GoStart(1, x, y, x / 2, x, 0, y / 2, a, n);
- assert(r.r0 == 1 && r.r1 == 101); // test multiple returns
- GoStart(2, x, y, 0, x / 2, y / 2, y, a, n);
- GoStart(3, x, y, x / 2, x, y / 2, y, a, n);
- GoWait(0);
- GoWait(1);
- GoWait(2);
- GoWait(3);
- }
- // The actual computation. This is called in parallel.
- void
- DoStep(int xdim, int ydim, int xstart, int xend, int ystart, int yend, int *a, int *n)
- {
- int x, y, c, i, j;
- for(x = xstart; x < xend; x++) {
- for(y = ystart; y < yend; y++) {
- c = 0;
- for(i = -1; i <= 1; i++) {
- for(j = -1; j <= 1; j++) {
- if(x+i >= 0 && x+i < xdim &&
- y+j >= 0 && y+j < ydim &&
- (i != 0 || j != 0))
- c += a[(x+i)*xdim + (y+j)] != 0;
- }
- }
- if(c == 3 || (c == 2 && a[x*xdim + y] != 0))
- n[x*xdim + y] = 1;
- else
- n[x*xdim + y] = 0;
- }
- }
- }
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