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-rw-r--r--include/internal/thread_once.h42
1 files changed, 42 insertions, 0 deletions
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 <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)