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REFCOUNT: Add support for querying refcount 

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/20765)
This commit is contained in:
Hugo Landau 2023-04-27 15:52:44 +01:00
parent 59c5c016e5
commit 008a61a544
1 changed files with 37 additions and 0 deletions
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37
include/internal/refcount.h
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@ -53,6 +53,13 @@ static inline int CRYPTO_DOWN_REF(_Atomic int *val, int *ret,
return 1;
}
static inline int CRYPTO_GET_REF(_Atomic int *val, int *ret,
ossl_unused void *lock)
{
*ret = atomic_load_explicit(val, memory_order_relaxed);
return 1;
}
# elif defined(__GNUC__) && defined(__ATOMIC_RELAXED) && __GCC_ATOMIC_INT_LOCK_FREE > 0
# define HAVE_ATOMICS 1
@ -73,6 +80,13 @@ static __inline__ int CRYPTO_DOWN_REF(int *val, int *ret,
__atomic_thread_fence(__ATOMIC_ACQUIRE);
return 1;
}
static __inline__ int CRYPTO_GET_REF(int *val, int *ret, ossl_unused void *lock)
{
*ret = __atomic_load_n(val, __ATOMIC_RELAXED);
return 1;
}
# elif defined(__ICL) && defined(_WIN32)
# define HAVE_ATOMICS 1
typedef volatile int CRYPTO_REF_COUNT;
@ -91,6 +105,13 @@ static __inline int CRYPTO_DOWN_REF(volatile int *val, int *ret,
return 1;
}
static __inline int CRYPTO_GET_REF(volatile int *val, int *ret,
ossl_unused void *lock)
{
*ret = _InterlockedOr((void *)val, 0);
return 1;
}
# elif defined(_MSC_VER) && _MSC_VER>=1200
# define HAVE_ATOMICS 1
@ -118,6 +139,14 @@ static __inline int CRYPTO_DOWN_REF(volatile int *val, int *ret,
__dmb(_ARM_BARRIER_ISH);
return 1;
}
static __inline int CRYPTO_GET_REF(volatile int *val, int *ret,
ossl_unused void *lock)
{
*ret = _InterlockedOr_nf((void *)val, 0);
return 1;
}
# else
# if !defined(_WIN32_WCE)
# pragma intrinsic(_InterlockedExchangeAdd)
@ -144,6 +173,14 @@ static __inline int CRYPTO_DOWN_REF(volatile int *val, int *ret,
*ret = _InterlockedExchangeAdd(val, -1) - 1;
return 1;
}
static __inline int CRYPTO_GET_REF(volatile int *val, int *ret,
ossl_unused void *lock)
{
*ret = _InterlockedExchangeAdd(val, 0);
return 1;
}
# endif
# endif