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       1                 :            : /*
       2                 :            :  * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
       3                 :            :  *
       4                 :            :  * Licensed under the Apache License, Version 2.0 (the "License").
       5                 :            :  * You may not use this file except in compliance with the License.
       6                 :            :  * A copy of the License is located at
       7                 :            :  *
       8                 :            :  *  http://aws.amazon.com/apache2.0
       9                 :            :  *
      10                 :            :  * or in the "license" file accompanying this file. This file is distributed
      11                 :            :  * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
      12                 :            :  * express or implied. See the License for the specific language governing
      13                 :            :  * permissions and limitations under the License.
      14                 :            :  */
      15                 :            : 
      16                 :            : #include "utils/s2n_atomic.h"
      17                 :            : 
      18                 :            : #include <signal.h>
      19                 :            : 
      20                 :            : #include "utils/s2n_safety.h"
      21                 :            : 
      22                 :            : static sig_atomic_t set_val = true;
      23                 :            : static sig_atomic_t clear_val = false;
      24                 :            : 
      25                 :            : S2N_RESULT s2n_atomic_init()
      26                 :        545 : {
      27                 :            : #if S2N_ATOMIC_SUPPORTED && S2N_THREAD_SANITIZER
      28                 :            :     RESULT_ENSURE(__atomic_always_lock_free(sizeof(s2n_atomic_flag), NULL), S2N_ERR_ATOMIC);
      29                 :            : #endif
      30                 :        545 :     return S2N_RESULT_OK;
      31                 :        545 : }
      32                 :            : 
      33                 :            : void s2n_atomic_flag_set(s2n_atomic_flag *var)
      34                 :      33490 : {
      35                 :            : #if S2N_ATOMIC_SUPPORTED && S2N_THREAD_SANITIZER
      36                 :            :     __atomic_store(&var->val, &set_val, __ATOMIC_RELAXED);
      37                 :            : #else
      38                 :      33490 :     var->val = set_val;
      39                 :      33490 : #endif
      40                 :      33490 : }
      41                 :            : 
      42                 :            : void s2n_atomic_flag_clear(s2n_atomic_flag *var)
      43                 :        850 : {
      44                 :            : #if S2N_ATOMIC_SUPPORTED && S2N_THREAD_SANITIZER
      45                 :            :     __atomic_store(&var->val, &clear_val, __ATOMIC_RELAXED);
      46                 :            : #else
      47                 :        850 :     var->val = clear_val;
      48                 :        850 : #endif
      49                 :        850 : }
      50                 :            : 
      51                 :            : bool s2n_atomic_flag_test(s2n_atomic_flag *var)
      52                 :    2680885 : {
      53                 :            : #if S2N_ATOMIC_SUPPORTED && S2N_THREAD_SANITIZER
      54                 :            :     sig_atomic_t result = 0;
      55                 :            :     __atomic_load(&var->val, &result, __ATOMIC_RELAXED);
      56                 :            :     return result;
      57                 :            : #else
      58                 :    2680885 :     return var->val;
      59                 :    2680885 : #endif
      60                 :    2680885 : }