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(__sun)
  14 # include <atomic.h>
  15 #endif
  16
  17 #if defined(OPENSSL_THREADS) && !defined(CRYPTO_TDEBUG) && !defined(OPENSSL_SYS_WINDOWS)
  18
  19 # ifdef PTHREAD_RWLOCK_INITIALIZER
  20 #  define USE_RWLOCK
  21 # endif
  22
  23 CRYPTO_RWLOCK *CRYPTO_THREAD_lock_new(void)
  24 {
  25 # ifdef USE_RWLOCK
  26     CRYPTO_RWLOCK *lock;
  27
  28     if ((lock = OPENSSL_zalloc(sizeof(pthread_rwlock_t))) == NULL) {
  29         /* Don't set error, to avoid recursion blowup. */
  30         return NULL;
  31     }
  32
  33     if (pthread_rwlock_init(lock, NULL) != 0) {
  34         OPENSSL_free(lock);
  35         return NULL;
  36     }
  37 # else
  38     pthread_mutexattr_t attr;
  39     CRYPTO_RWLOCK *lock;
  40
  41     if ((lock = OPENSSL_zalloc(sizeof(pthread_mutex_t))) == NULL) {
  42         /* Don't set error, to avoid recursion blowup. */
  43         return NULL;
  44     }
  45
  46     pthread_mutexattr_init(&attr);
  47     pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
  48
  49     if (pthread_mutex_init(lock, &attr) != 0) {
  50         pthread_mutexattr_destroy(&attr);
  51         OPENSSL_free(lock);
  52         return NULL;
  53     }
  54
  55     pthread_mutexattr_destroy(&attr);
  56 # endif
  57
  58     return lock;
  59 }
  60
  61 int CRYPTO_THREAD_read_lock(CRYPTO_RWLOCK *lock)
  62 {
  63 # ifdef USE_RWLOCK
  64     if (pthread_rwlock_rdlock(lock) != 0)
  65         return 0;
  66 # else
  67     if (pthread_mutex_lock(lock) != 0)
  68         return 0;
  69 # endif
  70
  71     return 1;
  72 }
  73
  74 int CRYPTO_THREAD_write_lock(CRYPTO_RWLOCK *lock)
  75 {
  76 # ifdef USE_RWLOCK
  77     if (pthread_rwlock_wrlock(lock) != 0)
  78         return 0;
  79 # else
  80     if (pthread_mutex_lock(lock) != 0)
  81         return 0;
  82 # endif
  83
  84     return 1;
  85 }
  86
  87 int CRYPTO_THREAD_unlock(CRYPTO_RWLOCK *lock)
  88 {
  89 # ifdef USE_RWLOCK
  90     if (pthread_rwlock_unlock(lock) != 0)
  91         return 0;
  92 # else
  93     if (pthread_mutex_unlock(lock) != 0)
  94         return 0;
  95 # endif
  96
  97     return 1;
  98 }
  99
 100 void CRYPTO_THREAD_lock_free(CRYPTO_RWLOCK *lock)
 101 {
 102     if (lock == NULL)
 103         return;
 104
 105 # ifdef USE_RWLOCK
 106     pthread_rwlock_destroy(lock);
 107 # else
 108     pthread_mutex_destroy(lock);
 109 # endif
 110     OPENSSL_free(lock);
 111
 112     return;
 113 }
 114
 115 int CRYPTO_THREAD_run_once(CRYPTO_ONCE *once, void (*init)(void))
 116 {
 117     if (pthread_once(once, init) != 0)
 118         return 0;
 119
 120     return 1;
 121 }
 122
 123 int CRYPTO_THREAD_init_local(CRYPTO_THREAD_LOCAL *key, void (*cleanup)(void *))
 124 {
 125     if (pthread_key_create(key, cleanup) != 0)
 126         return 0;
 127
 128     return 1;
 129 }
 130
 131 void *CRYPTO_THREAD_get_local(CRYPTO_THREAD_LOCAL *key)
 132 {
 133     return pthread_getspecific(*key);
 134 }
 135
 136 int CRYPTO_THREAD_set_local(CRYPTO_THREAD_LOCAL *key, void *val)
 137 {
 138     if (pthread_setspecific(*key, val) != 0)
 139         return 0;
 140
 141     return 1;
 142 }
 143
 144 int CRYPTO_THREAD_cleanup_local(CRYPTO_THREAD_LOCAL *key)
 145 {
 146     if (pthread_key_delete(*key) != 0)
 147         return 0;
 148
 149     return 1;
 150 }
 151
 152 CRYPTO_THREAD_ID CRYPTO_THREAD_get_current_id(void)
 153 {
 154     return pthread_self();
 155 }
 156
 157 int CRYPTO_THREAD_compare_id(CRYPTO_THREAD_ID a, CRYPTO_THREAD_ID b)
 158 {
 159     return pthread_equal(a, b);
 160 }
 161
 162 int CRYPTO_atomic_add(int *val, int amount, int *ret, CRYPTO_RWLOCK *lock)
 163 {
 164 # if defined(__GNUC__) && defined(__ATOMIC_ACQ_REL)
 165     if (__atomic_is_lock_free(sizeof(*val), val)) {
 166         *ret = __atomic_add_fetch(val, amount, __ATOMIC_ACQ_REL);
 167         return 1;
 168     }
 169 # elif defined(__sun) && (defined(__SunOS_5_10) || defined(__SunOS_5_11))
 170     /* This will work for all future Solaris versions. */
 171     if (ret != NULL) {
 172         *ret = atomic_add_int_nv((volatile unsigned int *)val, amount);
 173         return 1;
 174     }
 175 # endif
 176     if (!CRYPTO_THREAD_write_lock(lock))
 177         return 0;
 178
 179     *val += amount;
 180     *ret  = *val;
 181
 182     if (!CRYPTO_THREAD_unlock(lock))
 183         return 0;
 184
 185     return 1;
 186 }
 187
 188 # ifndef FIPS_MODE
 189 /* TODO(3.0): No fork protection in FIPS module yet! */
 190
 191 #  ifdef OPENSSL_SYS_UNIX
 192 static pthread_once_t fork_once_control = PTHREAD_ONCE_INIT;
 193
 194 static void fork_once_func(void)
 195 {
 196     pthread_atfork(OPENSSL_fork_prepare,
 197                    OPENSSL_fork_parent, OPENSSL_fork_child);
 198 }
 199 #  endif
 200
 201 int openssl_init_fork_handlers(void)
 202 {
 203 #  ifdef OPENSSL_SYS_UNIX
 204     if (pthread_once(&fork_once_control, fork_once_func) == 0)
 205         return 1;
 206 #  endif
 207     return 0;
 208 }
 209 # endif /* FIPS_MODE */
 210 #endif