X-Git-Url: https://git.openssl.org/gitweb/?p=openssl.git;a=blobdiff_plain;f=crypto%2Fthreads_pthread.c;h=5cc48afb16f2f484b066da12a0398353d7cbba0e;hp=6f5e812d97ac4bebdbda904650c64b5254df03e7;hb=e72040c1dcd61d6669762a60924b8fa3a48c37fc;hpb=b1322259d93cf6b6286f9febcd468b6a9f577d91

diff --git a/crypto/threads_pthread.c b/crypto/threads_pthread.c
index 6f5e812d97..5cc48afb16 100644
--- a/crypto/threads_pthread.c
+++ b/crypto/threads_pthread.c
@@ -109,9 +109,12 @@ 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)
 {
-#ifdef __ATOMIC_RELAXED
-    *ret = __atomic_add_fetch(val, amount, __ATOMIC_RELAXED);
-#else
+# if defined(__GNUC__) && defined(__ATOMIC_ACQ_REL)
+    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;
 }