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The C and C++ Include Header Files

cat -n /usr/include/openssl/thread.h

     1	/*
     2	 * Copyright 1995-2023 The OpenSSL Project Authors. All Rights Reserved.
     3	 * Copyright (c) 2002, Oracle and/or its affiliates. All rights reserved
     4	 *
     5	 * Licensed under the Apache License 2.0 (the "License").  You may not use
     6	 * this file except in compliance with the License.  You can obtain a copy
     7	 * in the file LICENSE in the source distribution or at
     8	 * https://www.openssl.org/source/license.html
     9	 */
    10	
    11	#ifndef OPENSSL_THREAD_H
    12	#define OPENSSL_THREAD_H
    13	
    14	#define OSSL_THREAD_SUPPORT_FLAG_THREAD_POOL (1U << 0)
    15	#define OSSL_THREAD_SUPPORT_FLAG_DEFAULT_SPAWN (1U << 1)
    16	
    17	#include <openssl/types.h>
    18	
    19	#ifdef __cplusplus
    20	extern "C" {
    21	#endif
    22	
    23	uint32_t OSSL_get_thread_support_flags(void);
    24	int OSSL_set_max_threads(OSSL_LIB_CTX *ctx, uint64_t max_threads);
    25	uint64_t OSSL_get_max_threads(OSSL_LIB_CTX *ctx);
    26	
    27	#ifdef __cplusplus
    28	}
    29	#endif
    30	
    31	#endif /* OPENSSL_THREAD_H */