/*

 * Copyright 2016-2025 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the Apache License 2.0 (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

 */

/* We need to use the OPENSSL_fork_*() deprecated APIs */

#define OPENSSL_SUPPRESS_DEPRECATED

#include <openssl/crypto.h>

#include "internal/cryptlib.h"

#if defined(__sun)

# include <atomic.h>

#endif

#if defined(__apple_build_version__) && __apple_build_version__ < 6000000

/*

 * OS/X 10.7 and 10.8 had a weird version of clang which has __ATOMIC_ACQUIRE and

 * __ATOMIC_ACQ_REL but which expects only one parameter for __atomic_is_lock_free()

 * rather than two which has signature __atomic_is_lock_free(sizeof(_Atomic(T))).

 * All of this makes impossible to use __atomic_is_lock_free here.

 *

 * See: https://github.com/llvm/llvm-project/commit/a4c2602b714e6c6edb98164550a5ae829b2de760

 */

#define BROKEN_CLANG_ATOMICS

#endif

#if defined(OPENSSL_THREADS) && !defined(CRYPTO_TDEBUG) && !defined(OPENSSL_SYS_WINDOWS)

# if defined(OPENSSL_SYS_UNIX)

#  include <sys/types.h>

#  include <unistd.h>

#endif

# include <assert.h>

/*

 * The Non-Stop KLT thread model currently seems broken in its rwlock

 * implementation

 * Likewise is there a problem with the glibc implementation on riscv.

 */

# if defined(PTHREAD_RWLOCK_INITIALIZER) && !defined(_KLT_MODEL_) \

                                         && !defined(__riscv)

#  define USE_RWLOCK

# endif

CRYPTO_RWLOCK *CRYPTO_THREAD_lock_new(void)

{

# ifdef USE_RWLOCK

    CRYPTO_RWLOCK *lock;

    if ((lock = OPENSSL_zalloc(sizeof(pthread_rwlock_t))) == NULL) {

        /* Don't set error, to avoid recursion blowup. */

        return NULL;

    }

    if (pthread_rwlock_init(lock, NULL) != 0) {

        OPENSSL_free(lock);

        return NULL;

    }

# else

    pthread_mutexattr_t attr;

    CRYPTO_RWLOCK *lock;

    if ((lock = OPENSSL_zalloc(sizeof(pthread_mutex_t))) == NULL) {

        /* Don't set error, to avoid recursion blowup. */

        return NULL;

    }

    /*

     * We don't use recursive mutexes, but try to catch errors if we do.

     */

    pthread_mutexattr_init(&attr);

#  if !defined (__TANDEM) && !defined (_SPT_MODEL_)

#   if !defined(NDEBUG) && !defined(OPENSSL_NO_MUTEX_ERRORCHECK)

    pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_ERRORCHECK);

#   endif

#  else

    /* The SPT Thread Library does not define MUTEX attributes. */

#  endif

    if (pthread_mutex_init(lock, &attr) != 0) {

        pthread_mutexattr_destroy(&attr);

        OPENSSL_free(lock);

        return NULL;

    }

    pthread_mutexattr_destroy(&attr);

# endif

    return lock;

}

__owur int CRYPTO_THREAD_read_lock(CRYPTO_RWLOCK *lock)

{

# ifdef USE_RWLOCK

    if (pthread_rwlock_rdlock(lock) != 0)

        return 0;

# else

    if (pthread_mutex_lock(lock) != 0) {

        assert(errno != EDEADLK && errno != EBUSY);

        return 0;

    }

# endif

    return 1;

}

__owur int CRYPTO_THREAD_write_lock(CRYPTO_RWLOCK *lock)

{

# ifdef USE_RWLOCK

    if (pthread_rwlock_wrlock(lock) != 0)

        return 0;

# else

    if (pthread_mutex_lock(lock) != 0) {

        assert(errno != EDEADLK && errno != EBUSY);

        return 0;

    }

# endif

    return 1;

}

int CRYPTO_THREAD_unlock(CRYPTO_RWLOCK *lock)

{

# ifdef USE_RWLOCK

    if (pthread_rwlock_unlock(lock) != 0)

        return 0;

# else

    if (pthread_mutex_unlock(lock) != 0) {

        assert(errno != EPERM);

        return 0;

    }

# endif

    return 1;

}

void CRYPTO_THREAD_lock_free(CRYPTO_RWLOCK *lock)

{

    if (lock == NULL)

        return;

# ifdef USE_RWLOCK

    pthread_rwlock_destroy(lock);

# else

    pthread_mutex_destroy(lock);

# endif

    OPENSSL_free(lock);

    return;

}

int CRYPTO_THREAD_run_once(CRYPTO_ONCE *once, void (*init)(void))

{

    if (pthread_once(once, init) != 0)

        return 0;

    return 1;

}

int CRYPTO_THREAD_init_local(CRYPTO_THREAD_LOCAL *key, void (*cleanup)(void *))

{

    if (pthread_key_create(key, cleanup) != 0)

        return 0;

    return 1;

}

void *CRYPTO_THREAD_get_local(CRYPTO_THREAD_LOCAL *key)

{

    return pthread_getspecific(*key);

}

int CRYPTO_THREAD_set_local(CRYPTO_THREAD_LOCAL *key, void *val)

{

    if (pthread_setspecific(*key, val) != 0)

        return 0;

    return 1;

}

int CRYPTO_THREAD_cleanup_local(CRYPTO_THREAD_LOCAL *key)

{

    if (pthread_key_delete(*key) != 0)

        return 0;

    return 1;

}

CRYPTO_THREAD_ID CRYPTO_THREAD_get_current_id(void)

{

    return pthread_self();

}

int CRYPTO_THREAD_compare_id(CRYPTO_THREAD_ID a, CRYPTO_THREAD_ID b)

{

    return pthread_equal(a, b);

}

int CRYPTO_atomic_add(int *val, int amount, int *ret, CRYPTO_RWLOCK *lock)

{

# if defined(__GNUC__) && defined(__ATOMIC_ACQ_REL) && !defined(BROKEN_CLANG_ATOMICS)

    if (__atomic_is_lock_free(sizeof(*val), val)) {

        *ret = __atomic_add_fetch(val, amount, __ATOMIC_ACQ_REL);

        return 1;

    }

# elif defined(__sun) && (defined(__SunOS_5_10) || defined(__SunOS_5_11))

    /* This will work for all future Solaris versions. */

    if (ret != NULL) {

        *ret = atomic_add_int_nv((volatile unsigned int *)val, amount);

        return 1;

    }

# endif

    if (lock == NULL || !CRYPTO_THREAD_write_lock(lock))

        return 0;

    *val += amount;

    *ret  = *val;

    if (!CRYPTO_THREAD_unlock(lock))

        return 0;

    return 1;

}

int CRYPTO_atomic_or(uint64_t *val, uint64_t op, uint64_t *ret,

                     CRYPTO_RWLOCK *lock)

{

# if defined(__GNUC__) && defined(__ATOMIC_ACQ_REL) && !defined(BROKEN_CLANG_ATOMICS)

    if (__atomic_is_lock_free(sizeof(*val), val)) {

        *ret = __atomic_or_fetch(val, op, __ATOMIC_ACQ_REL);

        return 1;

    }

# elif defined(__sun) && (defined(__SunOS_5_10) || defined(__SunOS_5_11))

    /* This will work for all future Solaris versions. */

    if (ret != NULL) {

        *ret = atomic_or_64_nv(val, op);

        return 1;

    }

# endif

    if (lock == NULL || !CRYPTO_THREAD_write_lock(lock))

        return 0;

    *val |= op;

    *ret  = *val;

    if (!CRYPTO_THREAD_unlock(lock))

        return 0;

    return 1;

}

int CRYPTO_atomic_load(uint64_t *val, uint64_t *ret, CRYPTO_RWLOCK *lock)

{

# if defined(__GNUC__) && defined(__ATOMIC_ACQ_REL) && !defined(BROKEN_CLANG_ATOMICS)

    if (__atomic_is_lock_free(sizeof(*val), val)) {

        __atomic_load(val, ret, __ATOMIC_ACQUIRE);

        return 1;

    }

# elif defined(__sun) && (defined(__SunOS_5_10) || defined(__SunOS_5_11))

    /* This will work for all future Solaris versions. */

    if (ret != NULL) {

        *ret = atomic_or_64_nv(val, 0);

        return 1;

    }

# endif

    if (lock == NULL || !CRYPTO_THREAD_read_lock(lock))

        return 0;

    *ret  = *val;

    if (!CRYPTO_THREAD_unlock(lock))

        return 0;

    return 1;

}

# ifndef FIPS_MODULE

int openssl_init_fork_handlers(void)

{

    return 1;

}

# endif /* FIPS_MODULE */

int openssl_get_fork_id(void)

{

    return getpid();

}

#endif