2 * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
10 #include <openssl/crypto.h>
12 #define DEFINE_RUN_ONCE(init) \
13 static int init(void); \
14 int init##_ossl_ret_ = 0; \
15 void init##_ossl_(void) \
17 init##_ossl_ret_ = init(); \
20 #define DECLARE_RUN_ONCE(init) \
21 extern int init##_ossl_ret_; \
22 void init##_ossl_(void);
24 #define DEFINE_RUN_ONCE_STATIC(init) \
25 static int init(void); \
26 static int init##_ossl_ret_ = 0; \
27 static void init##_ossl_(void) \
29 init##_ossl_ret_ = init(); \
34 * RUN_ONCE - use CRYPTO_THREAD_run_once, and check if the init succeeded
35 * @once: pointer to static object of type CRYPTO_ONCE
36 * @init: function name that was previously given to DEFINE_RUN_ONCE,
37 * DEFINE_RUN_ONCE_STATIC or DECLARE_RUN_ONCE.
39 * The return value is 1 on success or 0 in case of error.
41 #define RUN_ONCE(once, init) \
42 (CRYPTO_THREAD_run_once(once, init##_ossl_) ? init##_ossl_ret_ : 0)