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refcnt: introduce DEFINE_ATOMIC_REF_UNREF_FUNC() macro and friends

This commit is contained in:
Yu Watanabe 2018-08-27 13:58:15 +09:00
parent 6b6e07415c
commit 1d3044e275
1 changed files with 38 additions and 0 deletions
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38
src/basic/refcnt.h
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@ -14,3 +14,41 @@ typedef struct {
#define REFCNT_DEC(r) (__sync_sub_and_fetch(&(r)._value, 1))
#define REFCNT_INIT ((RefCount) { ._value = 1 })
#define _DEFINE_ATOMIC_REF_FUNC(type, name, scope) \
scope type *name##_ref(type *p) { \
if (!p) \
return NULL; \
\
assert_se(REFCNT_INC(p->n_ref) >= 2); \
return p; \
}
#define _DEFINE_ATOMIC_UNREF_FUNC(type, name, free_func, scope) \
scope type *name##_unref(type *p) { \
if (!p) \
return NULL; \
\
if (REFCNT_DEC(p->n_ref) > 0) \
return NULL; \
\
return free_func(p); \
}
#define DEFINE_ATOMIC_REF_FUNC(type, name) \
_DEFINE_ATOMIC_REF_FUNC(type, name,)
#define DEFINE_PUBLIC_ATOMIC_REF_FUNC(type, name) \
_DEFINE_ATOMIC_REF_FUNC(type, name, _public_)
#define DEFINE_ATOMIC_UNREF_FUNC(type, name, free_func) \
_DEFINE_ATOMIC_UNREF_FUNC(type, name, free_func,)
#define DEFINE_PUBLIC_ATOMIC_UNREF_FUNC(type, name, free_func) \
_DEFINE_ATOMIC_UNREF_FUNC(type, name, free_func, _public_)
#define DEFINE_ATOMIC_REF_UNREF_FUNC(type, name, free_func) \
DEFINE_ATOMIC_REF_FUNC(type, name); \
DEFINE_ATOMIC_UNREF_FUNC(type, name, free_func);
#define DEFINE_PUBLIC_ATOMIC_REF_UNREF_FUNC(type, name, free_func) \
DEFINE_PUBLIC_ATOMIC_REF_FUNC(type, name); \
DEFINE_PUBLIC_ATOMIC_UNREF_FUNC(type, name, free_func);