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CRYPTO_atomic_add(): use acquire release memory order rather than relaxed

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For increments, the relaxed model is fine.  For decrements, it's
recommended to use the acquire release model.  We therefore go for the
latter.

Reviewed-by: Andy Polyakov <appro@openssl.org>
This commit is contained in:
Richard Levitte 2016-08-24 12:01:39 +02:00 committed by Matt Caswell
parent cb4b54c23b
commit 11fc6c7611
1 changed files with 2 additions and 2 deletions
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4
crypto/threads_pthread.c
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@ -109,8 +109,8 @@ int CRYPTO_THREAD_compare_id(CRYPTO_THREAD_ID a, CRYPTO_THREAD_ID b)
int CRYPTO_atomic_add(int *val, int amount, int *ret, CRYPTO_RWLOCK *lock)
{
# if defined(__GNUC__) && defined(__ATOMIC_RELAXED)
*ret = __atomic_add_fetch(val, amount, __ATOMIC_RELAXED);
# if defined(__GNUC__) && defined(__ATOMIC_ACQ_REL)
*ret = __atomic_add_fetch(val, amount, __ATOMIC_ACQ_REL);
# else
if (!CRYPTO_THREAD_write_lock(lock))
return 0;