crypto/threads_pthread.c

   1 /*
   2  * Copyright 2016-2018 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 #include <openssl/crypto.h>
  11 #include "internal/cryptlib.h"
  12
  13 #if defined(OPENSSL_THREADS) && !defined(CRYPTO_TDEBUG) && !defined(OPENSSL_SYS_WINDOWS)
  14
  15 # ifdef PTHREAD_RWLOCK_INITIALIZER
  16 #  define USE_RWLOCK
  17 # endif
  18
  19 CRYPTO_RWLOCK *CRYPTO_THREAD_lock_new(void)
  20 {
  21 # ifdef USE_RWLOCK
  22     CRYPTO_RWLOCK *lock;
  23
  24     if ((lock = OPENSSL_zalloc(sizeof(pthread_rwlock_t))) == NULL) {
  25         /* Don't set error, to avoid recursion blowup. */
  26         return NULL;
  27     }
  28
  29     if (pthread_rwlock_init(lock, NULL) != 0) {
  30         OPENSSL_free(lock);
  31         return NULL;
  32     }
  33 # else
  34     pthread_mutexattr_t attr;
  35     CRYPTO_RWLOCK *lock;
  36
  37     if ((lock = OPENSSL_zalloc(sizeof(pthread_mutex_t))) == NULL) {
  38         /* Don't set error, to avoid recursion blowup. */
  39         return NULL;
  40     }
  41
  42     pthread_mutexattr_init(&attr);
  43     pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
  44
  45     if (pthread_mutex_init(lock, &attr) != 0) {
  46         pthread_mutexattr_destroy(&attr);
  47         OPENSSL_free(lock);
  48         return NULL;
  49     }
  50
  51     pthread_mutexattr_destroy(&attr);
  52 # endif
  53
  54     return lock;
  55 }
  56
  57 int CRYPTO_THREAD_read_lock(CRYPTO_RWLOCK *lock)
  58 {
  59 # ifdef USE_RWLOCK
  60     if (pthread_rwlock_rdlock(lock) != 0)
  61         return 0;
  62 # else
  63     if (pthread_mutex_lock(lock) != 0)
  64         return 0;
  65 # endif
  66
  67     return 1;
  68 }
  69
  70 int CRYPTO_THREAD_write_lock(CRYPTO_RWLOCK *lock)
  71 {
  72 # ifdef USE_RWLOCK
  73     if (pthread_rwlock_wrlock(lock) != 0)
  74         return 0;
  75 # else
  76     if (pthread_mutex_lock(lock) != 0)
  77         return 0;
  78 # endif
  79
  80     return 1;
  81 }
  82
  83 int CRYPTO_THREAD_unlock(CRYPTO_RWLOCK *lock)
  84 {
  85 # ifdef USE_RWLOCK
  86     if (pthread_rwlock_unlock(lock) != 0)
  87         return 0;
  88 # else
  89     if (pthread_mutex_unlock(lock) != 0)
  90         return 0;
  91 # endif
  92
  93     return 1;
  94 }
  95
  96 void CRYPTO_THREAD_lock_free(CRYPTO_RWLOCK *lock)
  97 {
  98     if (lock == NULL)
  99         return;
 100
 101 # ifdef USE_RWLOCK
 102     pthread_rwlock_destroy(lock);
 103 # else
 104     pthread_mutex_destroy(lock);
 105 # endif
 106     OPENSSL_free(lock);
 107
 108     return;
 109 }
 110
 111 int CRYPTO_THREAD_run_once(CRYPTO_ONCE *once, void (*init)(void))
 112 {
 113     if (pthread_once(once, init) != 0)
 114         return 0;
 115
 116     return 1;
 117 }
 118
 119 int CRYPTO_THREAD_init_local(CRYPTO_THREAD_LOCAL *key, void (*cleanup)(void *))
 120 {
 121     if (pthread_key_create(key, cleanup) != 0)
 122         return 0;
 123
 124     return 1;
 125 }
 126
 127 void *CRYPTO_THREAD_get_local(CRYPTO_THREAD_LOCAL *key)
 128 {
 129     return pthread_getspecific(*key);
 130 }
 131
 132 int CRYPTO_THREAD_set_local(CRYPTO_THREAD_LOCAL *key, void *val)
 133 {
 134     if (pthread_setspecific(*key, val) != 0)
 135         return 0;
 136
 137     return 1;
 138 }
 139
 140 int CRYPTO_THREAD_cleanup_local(CRYPTO_THREAD_LOCAL *key)
 141 {
 142     if (pthread_key_delete(*key) != 0)
 143         return 0;
 144
 145     return 1;
 146 }
 147
 148 CRYPTO_THREAD_ID CRYPTO_THREAD_get_current_id(void)
 149 {
 150     return pthread_self();
 151 }
 152
 153 int CRYPTO_THREAD_compare_id(CRYPTO_THREAD_ID a, CRYPTO_THREAD_ID b)
 154 {
 155     return pthread_equal(a, b);
 156 }
 157
 158 int CRYPTO_atomic_add(int *val, int amount, int *ret, CRYPTO_RWLOCK *lock)
 159 {
 160 # if defined(__GNUC__) && defined(__ATOMIC_ACQ_REL)
 161     if (__atomic_is_lock_free(sizeof(*val), val)) {
 162         *ret = __atomic_add_fetch(val, amount, __ATOMIC_ACQ_REL);
 163         return 1;
 164     }
 165 # endif
 166     if (!CRYPTO_THREAD_write_lock(lock))
 167         return 0;
 168
 169     *val += amount;
 170     *ret  = *val;
 171
 172     if (!CRYPTO_THREAD_unlock(lock))
 173         return 0;
 174
 175     return 1;
 176 }
 177
 178 # ifdef OPENSSL_SYS_UNIX
 179 static pthread_once_t fork_once_control = PTHREAD_ONCE_INIT;
 180
 181 static void fork_once_func(void)
 182 {
 183     pthread_atfork(OPENSSL_fork_prepare,
 184                    OPENSSL_fork_parent, OPENSSL_fork_child);
 185 }
 186 # endif
 187
 188 int openssl_init_fork_handlers(void)
 189 {
 190 # ifdef OPENSSL_SYS_UNIX
 191     if (pthread_once(&fork_once_control, fork_once_func) == 0)
 192         return 1;
 193 # endif
 194     return 0;
 195 }
 196 #endif