| 1 | /*
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| 2 | * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | #include <openssl/crypto.h>
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| 11 |
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| 12 | #define DEFINE_RUN_ONCE(init) \
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| 13 | static int init(void); \
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| 14 | int init##_ossl_ret_ = 0; \
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| 15 | void init##_ossl_(void) \
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| 16 | { \
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| 17 | init##_ossl_ret_ = init(); \
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| 18 | } \
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| 19 | static int init(void)
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| 20 | #define DECLARE_RUN_ONCE(init) \
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| 21 | extern int init##_ossl_ret_; \
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| 22 | void init##_ossl_(void);
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| 23 |
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| 24 | #define DEFINE_RUN_ONCE_STATIC(init) \
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| 25 | static int init(void); \
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| 26 | static int init##_ossl_ret_ = 0; \
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| 27 | static void init##_ossl_(void) \
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| 28 | { \
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| 29 | init##_ossl_ret_ = init(); \
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| 30 | } \
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| 31 | static int init(void)
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| 32 |
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| 33 | /*
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| 34 | * RUN_ONCE - use CRYPTO_THREAD_run_once, and check if the init succeeded
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| 35 | * @once: pointer to static object of type CRYPTO_ONCE
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| 36 | * @init: function name that was previously given to DEFINE_RUN_ONCE,
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| 37 | * DEFINE_RUN_ONCE_STATIC or DECLARE_RUN_ONCE. This function
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| 38 | * must return 1 for success or 0 for failure.
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| 39 | *
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| 40 | * The return value is 1 on success (*) or 0 in case of error.
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| 41 | *
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| 42 | * (*) by convention, since the init function must return 1 on success.
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| 43 | */
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| 44 | #define RUN_ONCE(once, init) \
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| 45 | (CRYPTO_THREAD_run_once(once, init##_ossl_) ? init##_ossl_ret_ : 0)
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