Hi golang-nuts,
I would like to call a C function from Go and get notified about the
execution status in Go, say a goroutine wait until the C function finally
made some progress.
Initially, I thought about passing a channel to C but the cgo document does
not say anything about that:
Later, I am thinking about using an atomic variable to sync status
according to its value, but somehow I end up with this warning while I am
compiling a cgo program:
package main
/*
#include <stdatomic.h>
void ainit(atomic_int *val) {
atomic_init(val, 0);
}
*/
import "C"
func main() {
var v C.atomic_int
C.ainit(&v)
}
cgo-gcc-prolog: In function ‘_cgo_8a67e594de48_Cfunc_ainit’:
cgo-gcc-prolog:49:14: warning: passing argument 1 of ‘ainit’ from
incompatible pointer type [-Wincompatible-pointer-types]
./main.go:5:24: note: expected ‘_Atomic atomic_int *’ {aka ‘_Atomic int *’}
but argument is of type ‘int *’
5 | void ainit(atomic_int *val) {
| ~~~~~~~~~~~~^~~
According to the warning and note, it seems that cgo is lacking translating
atomic_init? Did I do anything wrong? Or is there any better and preferred
way to get notified from C function?
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