英文:
Making a go string in C with cgo
问题
我正在尝试从C语言创建一个Go字符串。我有指针和长度，所以如果我从Go语言中进行操作，我可以调用C.GoStringN函数。
cgo生成了GoString结构体，所以我想知道是否可以直接使用它：
// 由cgo生成的结构体
typedef struct { const char *p; GoInt n; } GoString;
// 我从其他地方得到了s和n，我可以这样做吗？
const char* s = ... ; // 我拥有这个指针，不希望Go语言释放它
int n = ... ;
GoString st = {s, n};
我在这里使用它将一个我控制生命周期的char*转换为Go字符串。然后，将GoString作为参数传递给一个Go函数：
//export Nbytes
func Nbytes(s string) int {
...
}
Go语言的垃圾回收器会尝试回收这块内存吗？
英文:
I'm trying to make a go string from C. I have the pointer and the length, so if I was doing it from go, I could call the C.GoStringN function.
cgo generates the GoString struct, so I was wondering if I could use it directly:
// struct generated by cgo
typedef struct { const char *p; GoInt n; } GoString;
// I have s and n from somewhere else, can I do this ?
const char* s = ... ; // I own this and dont want go to free it
int n = ... ;
GoString st = {s, n } ;
I'm using this in here to make a go string out of a char* whose lifetime I control. The GoString is then used as an argument to a go function:
//export Nbytes
func Nbytes(s string) int {
...
}
Will go's garbage collector attempt to reclaim the memory ?
答案1
得分: 3
Go的垃圾回收器不会尝试回收使用C内存分配器分配的内存。你所描述的情况应该是安全的。当然，你可能无法释放C内存，因为你不知道Go何时会完成对它的使用。
英文:
Go's garbage collector will not try to reclaim memory allocated using the C memory allocator. What you are describing should be safe. Of course, you may not be able to free the C memory, because you don't know when Go will be done with it.
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