summaryrefslogtreecommitdiff
path: root/src/basic/refcnt.h
blob: d2be6086d2b222505aab3403d72f29405fb2dd14 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
/* SPDX-License-Identifier: LGPL-2.1+ */
#pragma once

/* A type-safe atomic refcounter.
 *
 * DO NOT USE THIS UNLESS YOU ACTUALLY CARE ABOUT THREAD SAFETY! */

typedef struct {
        volatile unsigned _value;
} RefCount;

#define REFCNT_GET(r) ((r)._value)
#define REFCNT_INC(r) (__sync_add_and_fetch(&(r)._value, 1))
#define REFCNT_DEC(r) (__sync_sub_and_fetch(&(r)._value, 1))

#define REFCNT_INIT ((RefCount) { ._value = 1 })