github.com/guyezi/gofrontend@v0.0.0-20200228202240-7a62a49e62c0/libgo/misc/cgo/testplugin/testdata/issue25756/plugin/life.go (about)

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