i can't use defer c.free to release the cgo.cstring memory when my func return the cstring

[杜仲]

my go version is 1.13.

i used cgo.cstring in my func, and the func will return cstring.

i don't know when c complete work about the cstring memory.

if i used defer c.free to release the cstring memory, the cstring val will change and return a unexpected value, especially at often apply memory on low memory environment.

now i use a funccollect the pointer and release after 1 hour or later.

is there any other way to solve?

[Ian Lance Taylor]

A string allocated with C.CString is allocated using the C malloc
function. It sounds like you are passing that string to C, in which
case it becomes the responsibility of the C code to free the string.
C code has to be aware of memory use and has to free memory when it is
no longer needed. If your C code does not track memory properly, that
is unfortunate, but there is nothing you can do to fix it safely on
the Go side.

Ian

[杜仲]

that's the problem, i use c just like an channel, the value final send to other language. i know i can make an call back function in c and then release that memory in c code.

 regrettably, this will take many time and i don;t have so much.

however ,thx