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