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/*
* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License").
* You may not use this file except in compliance with the License.
* A copy of the License is located at
*
* http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. This file is distributed
* on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
* express or implied. See the License for the specific language governing
* permissions and limitations under the License.
*/
#include "utils/s2n_atomic.h"
#include <signal.h>
#include "utils/s2n_safety.h"
static sig_atomic_t set_val = true;
static sig_atomic_t clear_val = false;
S2N_RESULT s2n_atomic_init()
{
#if S2N_ATOMIC_SUPPORTED && S2N_THREAD_SANITIZER
RESULT_ENSURE(__atomic_always_lock_free(sizeof(s2n_atomic_flag), NULL), S2N_ERR_ATOMIC);
#endif
return S2N_RESULT_OK;
}
void s2n_atomic_flag_set(s2n_atomic_flag *var)
{
#if S2N_ATOMIC_SUPPORTED && S2N_THREAD_SANITIZER
__atomic_store(&var->val, &set_val, __ATOMIC_RELAXED);
#else
var->val = set_val;
#endif
}
void s2n_atomic_flag_clear(s2n_atomic_flag *var)
{
#if S2N_ATOMIC_SUPPORTED && S2N_THREAD_SANITIZER
__atomic_store(&var->val, &clear_val, __ATOMIC_RELAXED);
#else
var->val = clear_val;
#endif
}
bool s2n_atomic_flag_test(s2n_atomic_flag *var)
{
#if S2N_ATOMIC_SUPPORTED && S2N_THREAD_SANITIZER
sig_atomic_t result = 0;
__atomic_load(&var->val, &result, __ATOMIC_RELAXED);
return result;
#else
return var->val;
#endif
}
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