Hi
Following are my Go code and C header file and C wrapper code
parser.go
==========
var f *os.File
func LoadPatternDB(patterndb string) {
path := C.CString(patterndb)
defer C.free(unsafe.Pointer(path))
C.load_pattern_db(path, (C.key_value_cb)(unsafe.Pointer(C.callOnMeGo_cgo)))
}
//export ParsedData
func ParsedData(k *C.char, val *C.char, val_len C.size_t) {
f.WriteString(C.GoString(k))
f.WriteString("\n")
}
cfunc.go
========
/*
#include <stdio.h>
// The gateway function
void callOnMeGo_cgo(char *k, char *val, size_t val_len)
{
void ParsedData(const char *k, const char *val, size_t val_len);
ParsedData(k, val, val_len);
}
*/
import "C"
node.h
=======
#ifndef TEST_H_INCLUDED
#define TEST_H_INCLUDED
#include <stdlib.h>
typedef void (*key_value_cb)(const char* k, const char* val, size_t
val_len);
int load_pattern_db(const char* file, key_value_cb cb);
#endif
node.c
---------
int load_pattern_db(const gchar* file, key_value_cb cb)
{
patterndb = pattern_db_new();
pattern_db_reload_ruleset(patterndb, configuration, file);
pattern_db_set_emit_func(patterndb, pdbtool_pdb_emit_accumulate, cb);
return 0;
}
I am calling '*LoadPatternDB*' method in my parser.go file that makes a cgo
call '*C.load_pattern_db'* where I am passing a callback function to the C
code.
The C code is a wrapper code that internally calls some syslog-ng library
apis'
What I observed is:
1)As soon as I call LoadPatternDB() method in parser.go there is some
increase in memory consumption(some memory leak).Ideally that should not
have happened.
2)To verify if the C code had some issue, I called the C wrapper code
method '*load_pattern_db*' from my main.c in the following manner to
completely eliminate Go code here.What I found is there is no increase in
memory consumption after every call ('load_pattern_db' was called 5
times).Hence there is no memory leak from C code.So the issue lies in the
Go code in '*LoadPatternDB*' method in parser.go
main.c
=======
void check(char *key, char *value, size_t value_len)
{
printf("I am in function check\n");
}
int main(void){
char* filename = "/home/nitish/default.xml";
key_value_cb s = check;
int i;
for (i=1; i<=5; i++)
{
load_pattern_db(filename, s);
printf("Sleeping for 5 second.\n");
sleep(5);
}
printf("Loading done 5 times.\n");
return 0;
}
3)Can someone please guide me and help me figure out the mem-leak in
'LoadPatternDB' method in parser.go at very first glance? Is the callback
function pointer an issue here ?
4)What tool can I use to check this mem-leak ?
Thanks,
Nitish
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