libgo/misc/cgo/life/life.go

   1 // skip
   2
   3 // Copyright 2010 The Go Authors. All rights reserved.
   4 // Use of this source code is governed by a BSD-style
   5 // license that can be found in the LICENSE file.
   6
   7 package life
   8
   9 // #include "life.h"
  10 import "C"
  11
  12 import "unsafe"
  13
  14 func Run(gen, x, y int, a []int32) {
  15         n := make([]int32, x*y)
  16         for i := 0; i < gen; i++ {
  17                 C.Step(C.int(x), C.int(y), (*C.int)(unsafe.Pointer(&a[0])), (*C.int)(unsafe.Pointer(&n[0])))
  18                 copy(a, n)
  19         }
  20 }
  21
  22 // Keep the channels visible from Go.
  23 var chans [4]chan bool
  24
  25 //export GoStart
  26 // Double return value is just for testing.
  27 func GoStart(i, xdim, ydim, xstart, xend, ystart, yend C.int, a *C.int, n *C.int) (int, int) {
  28         c := make(chan bool, int(C.MYCONST))
  29         go func() {
  30                 C.DoStep(xdim, ydim, xstart, xend, ystart, yend, a, n)
  31                 c <- true
  32         }()
  33         chans[i] = c
  34         return int(i), int(i + 100)
  35 }
  36
  37 //export GoWait
  38 func GoWait(i C.int) {
  39         <-chans[i]
  40         chans[i] = nil
  41 }