Make DRBG uninstantiate() and instantiate() methods inverse to each other
[openssl.git] / crypto / threads_pthread.c
index 9644c25..3aeef21 100644 (file)
@@ -169,6 +169,44 @@ int CRYPTO_atomic_add(int *val, int amount, int *ret, CRYPTO_RWLOCK *lock)
     return 1;
 }
 
+int CRYPTO_atomic_read(int *val, int *ret, CRYPTO_RWLOCK *lock)
+{
+# if defined(__GNUC__) && defined(__ATOMIC_ACQUIRE)
+    if (__atomic_is_lock_free(sizeof(*val), val)) {
+        __atomic_load(val, ret, __ATOMIC_ACQUIRE);
+        return 1;
+    }
+# endif
+    if (!CRYPTO_THREAD_read_lock(lock))
+        return 0;
+
+    *ret  = *val;
+
+    if (!CRYPTO_THREAD_unlock(lock))
+        return 0;
+
+    return 1;
+}
+
+int CRYPTO_atomic_write(int *val, int n, CRYPTO_RWLOCK *lock)
+{
+# if defined(__GNUC__) && defined(__ATOMIC_RELEASE)
+    if (__atomic_is_lock_free(sizeof(*val), val)) {
+        __atomic_store(val, &n, __ATOMIC_RELEASE);
+        return 1;
+    }
+# endif
+    if (!CRYPTO_THREAD_write_lock(lock))
+        return 0;
+
+    *val = n;
+
+    if (!CRYPTO_THREAD_unlock(lock))
+        return 0;
+
+    return 1;
+}
+
 # ifdef OPENSSL_SYS_UNIX
 static pthread_once_t fork_once_control = PTHREAD_ONCE_INIT;