Commit 925d17f3 authored by Richard Levitte's avatar Richard Levitte
Browse files

Define a few internal macros for easy use of run_once functions 



Because pthread_once() takes a function taking no argument and
returning nothing, and we want to be able to check if they're
successful, we define a few internal macros to get around the issue.

Reviewed-by: default avatarKurt Roeckx <kurt@openssl.org>
parent aebb9aac

include/internal/thread_once.h

0 → 100644
+42 −0
Original line number Diff line number Diff line 
/*

 * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the OpenSSL license (the "License").  You may not use

 * this file except in compliance with the License.  You can obtain a copy

 * in the file LICENSE in the source distribution or at

 * https://www.openssl.org/source/license.html

 */



#include <openssl/crypto.h>



#define DEFINE_RUN_ONCE(init)                   \

    static int init(void);                     \

    int init##_ossl_ret_ = 0;                   \

    void init##_ossl_(void)                     \

    {                                           \

        init##_ossl_ret_ = init();              \

    }                                           \

    static int init(void)

#define DECLARE_RUN_ONCE(init)                  \

    extern int init##_ossl_ret_;                \

    void init##_ossl_(void);



#define DEFINE_RUN_ONCE_STATIC(init)            \

    static int init(void);                     \

    static int init##_ossl_ret_ = 0;            \

    static void init##_ossl_(void)              \

    {                                           \

        init##_ossl_ret_ = init();              \

    }                                           \

    static int init(void)



/*

 * RUN_ONCE - use CRYPTO_THREAD_run_once, and check if the init succeeded

 * @once: pointer to static object of type CRYPTO_ONCE

 * @init: function name that was previously given to DEFINE_RUN_ONCE,

 *        DEFINE_RUN_ONCE_STATIC or DECLARE_RUN_ONCE.

 *

 * The return value is 1 on success or 0 in case of error.

 */

#define RUN_ONCE(once, init)                                            \

    (CRYPTO_THREAD_run_once(once, init##_ossl_) ? init##_ossl_ret_ : 0)