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      1 // Copyright 2013 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 cgotest
      6 
      7 // extern void doAdd(int, int);
      8 import "C"
      9 
     10 import (
     11 	"sync"
     12 	"testing"
     13 )
     14 
     15 var sum struct {
     16 	sync.Mutex
     17 	i int
     18 }
     19 
     20 //export Add
     21 func Add(x int) {
     22 	defer func() {
     23 		recover()
     24 	}()
     25 	sum.Lock()
     26 	sum.i += x
     27 	sum.Unlock()
     28 	var p *int
     29 	*p = 2
     30 }
     31 
     32 func testCthread(t *testing.T) {
     33 	sum.i = 0
     34 	C.doAdd(10, 6)
     35 
     36 	want := 10 * (10 - 1) / 2 * 6
     37 	if sum.i != want {
     38 		t.Fatalf("sum=%d, want %d", sum.i, want)
     39 	}
     40 }
     41