1 /* 2 * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved. 3 * 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 8 */ 9 10 #include <openssl/crypto.h> 11 12 #define DEFINE_RUN_ONCE(init) \ 13 static int init(void); \ 14 int init##_ossl_ret_ = 0; \ 15 void init##_ossl_(void) \ 16 { \ 17 init##_ossl_ret_ = init(); \ 18 } \ 19 static int init(void) 20 #define DECLARE_RUN_ONCE(init) \ 21 extern int init##_ossl_ret_; \ 22 void init##_ossl_(void); 23 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) \ 28 { \ 29 init##_ossl_ret_ = init(); \ 30 } \ 31 static int init(void) 32 33 /* 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. This function 38 * must return 1 for success or 0 for failure. 39 * 40 * The return value is 1 on success (*) or 0 in case of error. 41 * 42 * (*) by convention, since the init function must return 1 on success. 43 */ 44 #define RUN_ONCE(once, init) \ 45 (CRYPTO_THREAD_run_once(once, init##_ossl_) ? init##_ossl_ret_ : 0) 46