include/openssl/thread.h

// Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#ifndef OPENSSL_HEADER_THREAD_H
#define OPENSSL_HEADER_THREAD_H

#include <sys/types.h>

#include <openssl/base.h>   // IWYU pragma: export

#if defined(__cplusplus)
extern "C" {
#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.c.
typedef uint32_t CRYPTO_refcount_t;


// Deprecated functions.
//
// Historically, OpenSSL required callers to provide locking callbacks.
// BoringSSL does not use external callbacks for locking, 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