How to relase the memory allocated by c in golang

Getting Help
#1 
func SQLColAttribute(statementHandle SQLHSTMT, ColumnNumber SQLSMALLINT, FieldIdentifier SQLSMALLINT, CharacterAttributePtr SQLPOINTER, BufferLength SQLSMALLINT, StringLengthPtr *SQLSMALLINT, NumericAttributePtr *SQLLEN) (ret SQLRETURN) {
	r := C.SQLColAttribute(C.SQLHSTMT(statementHandle),C.SQLSMALLINT(ColumnNumber),C.SQLSMALLINT(FieldIdentifier),C.SQLPOINTER(CharacterAttributePtr),C.SQLSMALLINT(BufferLength),(*C.SQLSMALLINT)(StringLengthPtr),(*C.SQLLEN)(NumericAttributePtr))
	return SQLRETURN(r)
}

HERE:
CharacterAttributePtr — output
StringLengthPtr —output
NumericAttributePtr —output

I am using cgo to call the functions in cli driver. When i run the code i get goroutine problem i thing this is due to garbage collector unable to deallocate the memory allocated by the c. So how to solve this error.

Thanks.

#2

The garbage collector can deallocate only Go pointers and basically the C code can do what it likes. I know that is not realy straightforward but i guess you can use a separate process to do this, procces that can be killed to free the memory.

Read below more details.

https://golang.org/cmd/cgo/#hdr-Passing_pointers

#3

So that means In place of C.SQLPOINTER(CharacterAttributePtr) I have to write

C.free(unsafe.Pointer(CharacterAttributePtr)
#4

Even better where to use the libraries functions to clean up.

A well designed library will provide you some functions to clean up after it. You have to take a look at the documentation of the library you are interfacing with.

#5

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