crypto/threads_pthread.c

   1 /*
   2  * Copyright 2016-2020 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 # if defined(OPENSSL_SYS_UNIX)
  20 #  include <sys/types.h>
  21 #  include <unistd.h>
  22 #endif
  23
  24 # ifdef PTHREAD_RWLOCK_INITIALIZER
  25 #  define USE_RWLOCK
  26 # endif
  27
  28 CRYPTO_RWLOCK *CRYPTO_THREAD_lock_new(void)
  29 {
  30 # ifdef USE_RWLOCK
  31     CRYPTO_RWLOCK *lock;
  32
  33     if ((lock = OPENSSL_zalloc(sizeof(pthread_rwlock_t))) == NULL) {
  34         /* Don't set error, to avoid recursion blowup. */
  35         return NULL;
  36     }
  37
  38     if (pthread_rwlock_init(lock, NULL) != 0) {
  39         OPENSSL_free(lock);
  40         return NULL;
  41     }
  42 # else
  43     pthread_mutexattr_t attr;
  44     CRYPTO_RWLOCK *lock;
  45
  46     if ((lock = OPENSSL_zalloc(sizeof(pthread_mutex_t))) == NULL) {
  47         /* Don't set error, to avoid recursion blowup. */
  48         return NULL;
  49     }
  50
  51     pthread_mutexattr_init(&attr);
  52     #if defined(__TANDEM) && defined(_SPT_MODEL_)
  53       pthread_mutexattr_setkind_np(&attr,MUTEX_RECURSIVE_NP);
  54     #else
  55       pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
  56     #endif
  57
  58     if (pthread_mutex_init(lock, &attr) != 0) {
  59         pthread_mutexattr_destroy(&attr);
  60         OPENSSL_free(lock);
  61         return NULL;
  62     }
  63
  64     pthread_mutexattr_destroy(&attr);
  65 # endif
  66
  67     return lock;
  68 }
  69
  70 int CRYPTO_THREAD_read_lock(CRYPTO_RWLOCK *lock)
  71 {
  72 # ifdef USE_RWLOCK
  73     if (pthread_rwlock_rdlock(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_write_lock(CRYPTO_RWLOCK *lock)
  84 {
  85 # ifdef USE_RWLOCK
  86     if (pthread_rwlock_wrlock(lock) != 0)
  87         return 0;
  88 # else
  89     if (pthread_mutex_lock(lock) != 0)
  90         return 0;
  91 # endif
  92
  93     return 1;
  94 }
  95
  96 int CRYPTO_THREAD_unlock(CRYPTO_RWLOCK *lock)
  97 {
  98 # ifdef USE_RWLOCK
  99     if (pthread_rwlock_unlock(lock) != 0)
 100         return 0;
 101 # else
 102     if (pthread_mutex_unlock(lock) != 0)
 103         return 0;
 104 # endif
 105
 106     return 1;
 107 }
 108
 109 void CRYPTO_THREAD_lock_free(CRYPTO_RWLOCK *lock)
 110 {
 111     if (lock == NULL)
 112         return;
 113
 114 # ifdef USE_RWLOCK
 115     pthread_rwlock_destroy(lock);
 116 # else
 117     pthread_mutex_destroy(lock);
 118 # endif
 119     OPENSSL_free(lock);
 120
 121     return;
 122 }
 123
 124 int CRYPTO_THREAD_run_once(CRYPTO_ONCE *once, void (*init)(void))
 125 {
 126     if (pthread_once(once, init) != 0)
 127         return 0;
 128
 129     return 1;
 130 }
 131
 132 int CRYPTO_THREAD_init_local(CRYPTO_THREAD_LOCAL *key, void (*cleanup)(void *))
 133 {
 134     if (pthread_key_create(key, cleanup) != 0)
 135         return 0;
 136
 137     return 1;
 138 }
 139
 140 void *CRYPTO_THREAD_get_local(CRYPTO_THREAD_LOCAL *key)
 141 {
 142     return pthread_getspecific(*key);
 143 }
 144
 145 int CRYPTO_THREAD_set_local(CRYPTO_THREAD_LOCAL *key, void *val)
 146 {
 147     if (pthread_setspecific(*key, val) != 0)
 148         return 0;
 149
 150     return 1;
 151 }
 152
 153 int CRYPTO_THREAD_cleanup_local(CRYPTO_THREAD_LOCAL *key)
 154 {
 155     if (pthread_key_delete(*key) != 0)
 156         return 0;
 157
 158     return 1;
 159 }
 160
 161 CRYPTO_THREAD_ID CRYPTO_THREAD_get_current_id(void)
 162 {
 163     return pthread_self();
 164 }
 165
 166 int CRYPTO_THREAD_compare_id(CRYPTO_THREAD_ID a, CRYPTO_THREAD_ID b)
 167 {
 168     return pthread_equal(a, b);
 169 }
 170
 171 int CRYPTO_atomic_add(int *val, int amount, int *ret, CRYPTO_RWLOCK *lock)
 172 {
 173 # if defined(__GNUC__) && defined(__ATOMIC_ACQ_REL)
 174     if (__atomic_is_lock_free(sizeof(*val), val)) {
 175         *ret = __atomic_add_fetch(val, amount, __ATOMIC_ACQ_REL);
 176         return 1;
 177     }
 178 # elif defined(__sun) && (defined(__SunOS_5_10) || defined(__SunOS_5_11))
 179     /* This will work for all future Solaris versions. */
 180     if (ret != NULL) {
 181         *ret = atomic_add_int_nv((volatile unsigned int *)val, amount);
 182         return 1;
 183     }
 184 # endif
 185     if (!CRYPTO_THREAD_write_lock(lock))
 186         return 0;
 187
 188     *val += amount;
 189     *ret  = *val;
 190
 191     if (!CRYPTO_THREAD_unlock(lock))
 192         return 0;
 193
 194     return 1;
 195 }
 196
 197 # ifndef FIPS_MODULE
 198 #  ifdef OPENSSL_SYS_UNIX
 199 static pthread_once_t fork_once_control = PTHREAD_ONCE_INIT;
 200
 201 static void fork_once_func(void)
 202 {
 203     pthread_atfork(OPENSSL_fork_prepare,
 204                    OPENSSL_fork_parent, OPENSSL_fork_child);
 205 }
 206 #  endif
 207
 208 int openssl_init_fork_handlers(void)
 209 {
 210 #  ifdef OPENSSL_SYS_UNIX
 211     if (pthread_once(&fork_once_control, fork_once_func) == 0)
 212         return 1;
 213 #  endif
 214     return 0;
 215 }
 216 # endif /* FIPS_MODULE */
 217
 218 int openssl_get_fork_id(void)
 219 {
 220     return getpid();
 221 }
 222 #endif