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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 #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; } } }