github.com/huandu/go@v0.0.0-20151114150818-04e615e41150/misc/cgo/test/cthread.go (about)

     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  }