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      1 /*
      2  * Copyright 2023-2024 The OpenSSL Project Authors. All Rights Reserved.
      3  *
      4  * Licensed under the Apache License 2.0 (the "License").  You may not use
      5  * this file except in compliance with the License.  You can obtain a copy
      6  * in the file LICENSE in the source distribution or at
      7  * https://www.openssl.org/source/license.html
      8  */
      9 
     10 #ifndef OPENSSL_RCU_H
     11 #define OPENSSL_RCU_H
     12 #pragma once
     13 
     14 #include "crypto/context.h"
     15 
     16 typedef void (*rcu_cb_fn)(void *data);
     17 
     18 typedef struct rcu_lock_st CRYPTO_RCU_LOCK;
     19 
     20 CRYPTO_RCU_LOCK *ossl_rcu_lock_new(int num_writers, OSSL_LIB_CTX *ctx);
     21 void ossl_rcu_lock_free(CRYPTO_RCU_LOCK *lock);
     22 void ossl_rcu_read_lock(CRYPTO_RCU_LOCK *lock);
     23 void ossl_rcu_write_lock(CRYPTO_RCU_LOCK *lock);
     24 void ossl_rcu_write_unlock(CRYPTO_RCU_LOCK *lock);
     25 void ossl_rcu_read_unlock(CRYPTO_RCU_LOCK *lock);
     26 void ossl_synchronize_rcu(CRYPTO_RCU_LOCK *lock);
     27 int ossl_rcu_call(CRYPTO_RCU_LOCK *lock, rcu_cb_fn cb, void *data);
     28 void *ossl_rcu_uptr_deref(void **p);
     29 void ossl_rcu_assign_uptr(void **p, void **v);
     30 #define ossl_rcu_deref(p) ossl_rcu_uptr_deref((void **)p)
     31 #define ossl_rcu_assign_ptr(p, v) ossl_rcu_assign_uptr((void **)p, (void **)v)
     32 
     33 #endif
     34