text: /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   * All rights reserved.
   *
   * This package is an SSL implementation written
   * by Eric Young (eay@cryptsoft.com).
   * The implementation was written so as to conform with Netscapes SSL.
   *
   * This library is free for commercial and non-commercial use as long as
   * the following conditions are aheared to.  The following conditions
   * apply to all code found in this distribution, be it the RC4, RSA,
   * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
   * included with this distribution is covered by the same copyright terms
   * except that the holder is Tim Hudson (tjh@cryptsoft.com).
   *
   * Copyright remains Eric Young's, and as such any Copyright notices in
   * the code are not to be removed.
   * If this package is used in a product, Eric Young should be given attribution
   * as the author of the parts of the library used.
   * This can be in the form of a textual message at program startup or
   * in documentation (online or textual) provided with the package.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. All advertising materials mentioning features or use of this software
   *    must display the following acknowledgement:
   *    "This product includes cryptographic software written by
   *     Eric Young (eay@cryptsoft.com)"
   *    The word 'cryptographic' can be left out if the rouines from the library
   *    being used are not cryptographic related :-).
   * 4. If you include any Windows specific code (or a derivative thereof) from
   *    the apps directory (application code) you must include an acknowledgement:
   *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
   *
   * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   *
   * The licence and distribution terms for any publically available version or
   * derivative of this code cannot be changed.  i.e. this code cannot simply be
   * copied and put under another distribution licence
   * [including the GNU Public Licence.] */
  
  #ifndef OPENSSL_HEADER_THREAD_H
  #define OPENSSL_HEADER_THREAD_H
  
  #include <sys/types.h>
  
  #include <openssl/base.h>
  
  #if defined(__cplusplus)
  extern "C" {
  #endif
  
  
  #if defined(OPENSSL_NO_THREADS)
  typedef struct crypto_mutex_st {
    char padding;  // Empty structs have different sizes in C and C++.
  } CRYPTO_MUTEX;
  #elif defined(OPENSSL_WINDOWS)
  // CRYPTO_MUTEX can appear in public header files so we really don't want to
  // pull in windows.h. It's statically asserted that this structure is large
  // enough to contain a Windows SRWLOCK by thread_win.c.
  typedef union crypto_mutex_st {
    void *handle;
  } CRYPTO_MUTEX;
  #elif defined(__MACH__) && defined(__APPLE__)
  typedef pthread_rwlock_t CRYPTO_MUTEX;
  #else
  // It is reasonable to include pthread.h on non-Windows systems, however the
  // |pthread_rwlock_t| that we need is hidden under feature flags, and we can't
  // ensure that we'll be able to get it. It's statically asserted that this
  // structure is large enough to contain a |pthread_rwlock_t| by
  // thread_pthread.c.
  typedef union crypto_mutex_st {
    double alignment;
    uint8_t padding[3*sizeof(int) + 5*sizeof(unsigned) + 16 + 8];
  } CRYPTO_MUTEX;
  #endif
  
  // CRYPTO_refcount_t is the type of a reference count.
  //
  // Since some platforms use C11 atomics to access this, it should have the
  // _Atomic qualifier. However, this header is included by C++ programs as well
  // as C code that might not set -std=c11. So, in practice, it's not possible to
  // do that. Instead we statically assert that the size and native alignment of
  // a plain uint32_t and an _Atomic uint32_t are equal in refcount_c11.c.
  typedef uint32_t CRYPTO_refcount_t;
  
  
  // Deprecated functions.
  //
  // Historically, OpenSSL required callers to provide locking callbacks.
  // BoringSSL is thread-safe by default, but some old code calls these functions
  // and so no-op implementations are provided.
  
  // These defines do nothing but are provided to make old code easier to
  // compile.
  #define CRYPTO_LOCK 1
  #define CRYPTO_UNLOCK 2
  #define CRYPTO_READ 4
  #define CRYPTO_WRITE 8
  
  // CRYPTO_num_locks returns one. (This is non-zero that callers who allocate
  // sizeof(lock) times this value don't get zero and then fail because malloc(0)
  // returned NULL.)
  OPENSSL_EXPORT int CRYPTO_num_locks(void);
  
  // CRYPTO_set_locking_callback does nothing.
  OPENSSL_EXPORT void CRYPTO_set_locking_callback(
      void (*func)(int mode, int lock_num, const char *file, int line));
  
  // CRYPTO_set_add_lock_callback does nothing.
  OPENSSL_EXPORT void CRYPTO_set_add_lock_callback(int (*func)(
      int *num, int amount, int lock_num, const char *file, int line));
  
  // CRYPTO_get_locking_callback returns NULL.
  OPENSSL_EXPORT void (*CRYPTO_get_locking_callback(void))(int mode, int lock_num,
                                                           const char *file,
                                                           int line);
  
  // CRYPTO_get_lock_name returns a fixed, dummy string.
  OPENSSL_EXPORT const char *CRYPTO_get_lock_name(int lock_num);
  
  // CRYPTO_THREADID_set_callback returns one.
  OPENSSL_EXPORT int CRYPTO_THREADID_set_callback(
      void (*threadid_func)(CRYPTO_THREADID *threadid));
  
  // CRYPTO_THREADID_set_numeric does nothing.
  OPENSSL_EXPORT void CRYPTO_THREADID_set_numeric(CRYPTO_THREADID *id,
                                                  unsigned long val);
  
  // CRYPTO_THREADID_set_pointer does nothing.
  OPENSSL_EXPORT void CRYPTO_THREADID_set_pointer(CRYPTO_THREADID *id, void *ptr);
  
  // CRYPTO_THREADID_current does nothing.
  OPENSSL_EXPORT void CRYPTO_THREADID_current(CRYPTO_THREADID *id);
  
  // CRYPTO_set_id_callback does nothing.
  OPENSSL_EXPORT void CRYPTO_set_id_callback(unsigned long (*func)(void));
  
  typedef struct {
    int references;
    struct CRYPTO_dynlock_value *data;
  } CRYPTO_dynlock;
  
  // CRYPTO_set_dynlock_create_callback does nothing.
  OPENSSL_EXPORT void CRYPTO_set_dynlock_create_callback(
      struct CRYPTO_dynlock_value *(*dyn_create_function)(const char *file,
                                                          int line));
  
  // CRYPTO_set_dynlock_lock_callback does nothing.
  OPENSSL_EXPORT void CRYPTO_set_dynlock_lock_callback(void (*dyn_lock_function)(
      int mode, struct CRYPTO_dynlock_value *l, const char *file, int line));
  
  // CRYPTO_set_dynlock_destroy_callback does nothing.
  OPENSSL_EXPORT void CRYPTO_set_dynlock_destroy_callback(
      void (*dyn_destroy_function)(struct CRYPTO_dynlock_value *l,
                                   const char *file, int line));
  
  // CRYPTO_get_dynlock_create_callback returns NULL.
  OPENSSL_EXPORT struct CRYPTO_dynlock_value *(
      *CRYPTO_get_dynlock_create_callback(void))(const char *file, int line);
  
  // CRYPTO_get_dynlock_lock_callback returns NULL.
  OPENSSL_EXPORT void (*CRYPTO_get_dynlock_lock_callback(void))(
      int mode, struct CRYPTO_dynlock_value *l, const char *file, int line);
  
  // CRYPTO_get_dynlock_destroy_callback returns NULL.
  OPENSSL_EXPORT void (*CRYPTO_get_dynlock_destroy_callback(void))(
      struct CRYPTO_dynlock_value *l, const char *file, int line);
  
  
  #if defined(__cplusplus)
  }  // extern C
  #endif
  
  #endif  // OPENSSL_HEADER_THREAD_H
  