英文:
Do I have to free structs created with Cgo?
问题
在Go代码中创建C结构体时，例如：
var data C.MyStruct_t
我需要在某个时候手动释放它们吗，就像我在使用CString时那样？对于CString，我经常会这样做：
ctitle := C.String(title)
defer C.free(unsafe.Pointer(&ctitle))
C.my_func(&ctitle)
英文:
I create C structs in my Go code, like this:
var data C.MyStruct_t
Do I have to free them manually at some point, like I do when I use CString? With CString I often do something like:
ctitle := C.String(title)
defer C.free(unsafe.Pointer(&ctitle))
C.my_func(&ctitle)
答案1
得分: 5
不。只有在通过C的*alloc函数分配的内存上才需要调用free。C.CString和C.CBytes函数在文档中已经说明会在内部进行释放，并要求使用C.free。
在这种情况下，即使data的类型是C.MyStruct_t，它是在Go中分配的，因此将由Go的垃圾回收器处理。
英文:
No. You only call free on something that was allocated via the C *alloc functions. The C.CString and C.CBytes functions are documented as doing so internally, and requiring the use of C.free.
In this case even though data is of type C.MyStruct_t it is allocated in Go, and therefor will be handled by the Go garbage collector.
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