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/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2024-2025 The FreeBSD Foundation
*
* This software was developed by Björn Zeeb under sponsorship from
* the FreeBSD Foundation.
*/
#ifndef _LINUXKPI_LINUX_CLEANUP_H
#define _LINUXKPI_LINUX_CLEANUP_H
#define __cleanup(_f) __attribute__((__cleanup__(_f)))
/*
* Note: "_T" are special as they are exposed into common code for
* statements. Extra care should be taken when changing the code.
*/
#define DEFINE_GUARD(_n, _dt, _lock, _unlock) \
\
typedef _dt guard_ ## _n ## _t; \
\
static inline _dt \
guard_ ## _n ## _create( _dt _T) \
{ \
_dt c; \
\
c = ({ _lock; _T; }); \
return (c); \
} \
\
static inline void \
guard_ ## _n ## _destroy(_dt *t) \
{ \
_dt _T; \
\
_T = *t; \
if (_T) { _unlock; }; \
}
/* We need to keep these calls unique. */
#define guard(_n) \
guard_ ## _n ## _t guard_ ## _n ## _ ## __COUNTER__ \
__cleanup(guard_ ## _n ## _destroy) = guard_ ## _n ## _create
#define DEFINE_FREE(_n, _t, _f) \
static inline void \
__free_ ## _n(void *p) \
{ \
_t _T; \
\
_T = *(_t *)p; \
_f; \
}
#define __free(_n) __cleanup(__free_##_n)
/*
* Given this is a _0 version it should likely be broken up into parts.
* But we have no idead what a _1, _2, ... version would do different
* until we see a call.
* This is used for a not-real-type (rcu). We use a bool to "simulate"
* the lock held. Also _T still special, may not always be used, so tag
* with __unused (or better the LinuxKPI __maybe_unused).
*/
#define DEFINE_LOCK_GUARD_0(_n, _lock, _unlock, ...) \
\
typedef struct { \
bool lock; \
__VA_ARGS__; \
} guard_ ## _n ## _t; \
\
static inline void \
guard_ ## _n ## _destroy(guard_ ## _n ## _t *_T) \
{ \
if (_T->lock) { \
_unlock; \
} \
} \
\
static inline guard_ ## _n ## _t \
guard_ ## _n ## _create(void) \
{ \
guard_ ## _n ## _t _tmp; \
guard_ ## _n ## _t *_T __maybe_unused; \
\
_tmp.lock = true; \
_T = &_tmp; \
_lock; \
return (_tmp); \
}
#endif /* _LINUXKPI_LINUX_CLEANUP_H */
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