From 925d17f3ee4b7f7881fa77a31524ecd9f1305242 Mon Sep 17 00:00:00 2001 From: Richard Levitte Date: Tue, 19 Jul 2016 19:38:57 +0200 Subject: [PATCH] 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: Kurt Roeckx --- include/internal/thread_once.h | 42 ++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) create mode 100644 include/internal/thread_once.h diff --git a/include/internal/thread_once.h b/include/internal/thread_once.h new file mode 100644 index 0000000000..74f6ccb238 --- /dev/null +++ b/include/internal/thread_once.h @@ -0,0 +1,42 @@ +/* + * 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 + +#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) -- 2.25.1