go msan4 源码
golang msan4 代码
文件路径：/misc/cgo/testsanitizers/testdata/msan4.go
// Copyright 2015 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.
package main
// The memory profiler can call copy from a slice on the system stack,
// which msan used to think meant a reference to uninitialized memory.
/*
#include <time.h>
#include <unistd.h>
extern void Nop(char*);
// Use weak as a hack to permit defining a function even though we use export.
void poison() __attribute__ ((weak));
// Poison the stack.
void poison() {
char a[1024];
Nop(&a[0]);
}
*/
import "C"
import (
"runtime"
)
func main() {
runtime.MemProfileRate = 1
start(100)
}
func start(i int) {
if i == 0 {
return
}
C.poison()
// Tie up a thread.
// We won't actually wait for this sleep to complete.
go func() { C.sleep(1) }()
start(i - 1)
}
//export Nop
func Nop(*C.char) {
}
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