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internal/refcount.h: allow non-atomic build

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Configure with -DOPENSSL_DEV_NO_ATOMICS and you get refcount without
atomics.  This is intended for internal development only, to check the
refcounting is properly coded.  It should never become a configuration
option, hence the name of the macro.

Reviewed-by: Matthias St. Pierre <Matthias.St.Pierre@ncp-e.com>
(Merged from https://github.com/openssl/openssl/pull/8479)
This commit is contained in:
Richard Levitte 2019-03-14 09:59:00 +01:00
parent 085bef9f7c
commit 503d4745a1
1 changed files with 30 additions and 21 deletions
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51
include/internal/refcount.h
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@ -16,16 +16,17 @@
# endif
# endif
# if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L \
&& !defined(__STDC_NO_ATOMICS__)
# include <stdatomic.h>
# define HAVE_C11_ATOMICS
# endif
# ifndef OPENSSL_DEV_NO_ATOMICS
# if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L \
&& !defined(__STDC_NO_ATOMICS__)
# include <stdatomic.h>
# define HAVE_C11_ATOMICS
# endif
# if defined(HAVE_C11_ATOMICS) && defined(ATOMIC_INT_LOCK_FREE) \
&& ATOMIC_INT_LOCK_FREE > 0
# if defined(HAVE_C11_ATOMICS) && defined(ATOMIC_INT_LOCK_FREE) \
&& ATOMIC_INT_LOCK_FREE > 0
# define HAVE_ATOMICS 1
# define HAVE_ATOMICS 1
typedef _Atomic int CRYPTO_REF_COUNT;
@ -53,9 +54,9 @@ static inline int CRYPTO_DOWN_REF(_Atomic int *val, int *ret, void *lock)
return 1;
}
# elif defined(__GNUC__) && defined(__ATOMIC_RELAXED) && __GCC_ATOMIC_INT_LOCK_FREE > 0
# elif defined(__GNUC__) && defined(__ATOMIC_RELAXED) && __GCC_ATOMIC_INT_LOCK_FREE > 0
# define HAVE_ATOMICS 1
# define HAVE_ATOMICS 1
typedef int CRYPTO_REF_COUNT;
@ -73,17 +74,17 @@ static __inline__ int CRYPTO_DOWN_REF(int *val, int *ret, void *lock)
return 1;
}
# elif defined(_MSC_VER) && _MSC_VER>=1200
# elif defined(_MSC_VER) && _MSC_VER>=1200
# define HAVE_ATOMICS 1
# define HAVE_ATOMICS 1
typedef volatile int CRYPTO_REF_COUNT;
# if (defined(_M_ARM) && _M_ARM>=7) || defined(_M_ARM64)
# include <intrin.h>
# if defined(_M_ARM64) && !defined(_ARM_BARRIER_ISH)
# define _ARM_BARRIER_ISH _ARM64_BARRIER_ISH
# endif
# if (defined(_M_ARM) && _M_ARM>=7) || defined(_M_ARM64)
# include <intrin.h>
# if defined(_M_ARM64) && !defined(_ARM_BARRIER_ISH)
# define _ARM_BARRIER_ISH _ARM64_BARRIER_ISH
# endif
static __inline int CRYPTO_UP_REF(volatile int *val, int *ret, void *lock)
{
@ -98,8 +99,8 @@ static __inline int CRYPTO_DOWN_REF(volatile int *val, int *ret, void *lock)
__dmb(_ARM_BARRIER_ISH);
return 1;
}
# else
# pragma intrinsic(_InterlockedExchangeAdd)
# else
# pragma intrinsic(_InterlockedExchangeAdd)
static __inline int CRYPTO_UP_REF(volatile int *val, int *ret, void *lock)
{
@ -112,9 +113,17 @@ static __inline int CRYPTO_DOWN_REF(volatile int *val, int *ret, void *lock)
*ret = _InterlockedExchangeAdd(val, -1) - 1;
return 1;
}
# endif
# endif
# else
# endif
# endif /* !OPENSSL_DEV_NO_ATOMICS */
/*
* All the refcounting implementations above define HAVE_ATOMICS, so if it's
* still undefined here (such as when OPENSSL_DEV_NO_ATMOICS is defined), it
* means we need to implement a fallback. This fallback uses locks.
*/
# ifndef HAVE_ATOMICS
typedef int CRYPTO_REF_COUNT;