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CRYPTO_atomic_add(): check that the object is lock free

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If not, fall back to our own code, using the given mutex

Reviewed-by: Andy Polyakov <appro@openssl.org>
This commit is contained in:
Richard Levitte 2016-08-24 09:14:44 +02:00 committed by Matt Caswell
parent 11fc6c7611
commit 1beca67688
1 changed files with 5 additions and 3 deletions
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8
crypto/threads_pthread.c
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@ -110,8 +110,11 @@ 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_ACQ_REL)
*ret = __atomic_add_fetch(val, amount, __ATOMIC_ACQ_REL);
# else
if (__atomic_is_lock_free(sizeof(*val), val)) {
*ret = __atomic_add_fetch(val, amount, __ATOMIC_ACQ_REL);
return 1;
}
# endif
if (!CRYPTO_THREAD_write_lock(lock))
return 0;
@ -120,7 +123,6 @@ int CRYPTO_atomic_add(int *val, int amount, int *ret, CRYPTO_RWLOCK *lock)
if (!CRYPTO_THREAD_unlock(lock))
return 0;
# endif
return 1;
}