go issue21897 源码
golang issue21897 代码
文件路径：/misc/cgo/test/issue21897.go
// Copyright 2017 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.
//go:build darwin && cgo && !internal
// +build darwin,cgo,!internal
package cgotest
/*
#cgo LDFLAGS: -framework CoreFoundation
#include <CoreFoundation/CoreFoundation.h>
*/
import "C"
import (
"runtime/debug"
"testing"
"unsafe"
)
func test21897(t *testing.T) {
// Please write barrier, kick in soon.
defer debug.SetGCPercent(debug.SetGCPercent(1))
for i := 0; i < 10000; i++ {
testCFNumberRef()
testCFDateRef()
testCFBooleanRef()
// Allocate some memory, so eventually the write barrier is enabled
// and it will see writes of bad pointers in the test* functions below.
byteSliceSink = make([]byte, 1024)
}
}
var byteSliceSink []byte
func testCFNumberRef() {
var v int64 = 0
xCFNumberRef = C.CFNumberCreate(C.kCFAllocatorSystemDefault, C.kCFNumberSInt64Type, unsafe.Pointer(&v))
//fmt.Printf("CFNumberRef: %x\n", uintptr(unsafe.Pointer(xCFNumberRef)))
}
var xCFNumberRef C.CFNumberRef
func testCFDateRef() {
xCFDateRef = C.CFDateCreate(C.kCFAllocatorSystemDefault, 0) // 0 value is 1 Jan 2001 00:00:00 GMT
//fmt.Printf("CFDateRef: %x\n", uintptr(unsafe.Pointer(xCFDateRef)))
}
var xCFDateRef C.CFDateRef
func testCFBooleanRef() {
xCFBooleanRef = C.kCFBooleanFalse
//fmt.Printf("CFBooleanRef: %x\n", uintptr(unsafe.Pointer(xCFBooleanRef)))
}
var xCFBooleanRef C.CFBooleanRef
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