1 | /*
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2 | * Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
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3 | *
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4 | * Licensed under the OpenSSL license (the "License"). You may not use
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5 | * this file except in compliance with the License. You can obtain a copy
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6 | * in the file LICENSE in the source distribution or at
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7 | * https://www.openssl.org/source/license.html
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8 | */
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9 |
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10 | #include <openssl/crypto.h>
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11 |
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12 | #if defined(OPENSSL_THREADS) && !defined(CRYPTO_TDEBUG) && !defined(OPENSSL_SYS_WINDOWS)
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13 |
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14 | # ifdef PTHREAD_RWLOCK_INITIALIZER
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15 | # define USE_RWLOCK
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16 | # endif
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17 |
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18 | CRYPTO_RWLOCK *CRYPTO_THREAD_lock_new(void)
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19 | {
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20 | # ifdef USE_RWLOCK
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21 | CRYPTO_RWLOCK *lock = OPENSSL_zalloc(sizeof(pthread_rwlock_t));
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22 | if (lock == NULL)
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23 | return NULL;
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24 |
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25 | if (pthread_rwlock_init(lock, NULL) != 0) {
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26 | OPENSSL_free(lock);
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27 | return NULL;
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28 | }
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29 | # else
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30 | pthread_mutexattr_t attr;
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31 | CRYPTO_RWLOCK *lock = OPENSSL_zalloc(sizeof(pthread_mutex_t));
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32 | if (lock == NULL)
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33 | return NULL;
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34 |
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35 | pthread_mutexattr_init(&attr);
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36 | pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
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37 |
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38 | if (pthread_mutex_init(lock, &attr) != 0) {
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39 | pthread_mutexattr_destroy(&attr);
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40 | OPENSSL_free(lock);
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41 | return NULL;
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42 | }
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43 |
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44 | pthread_mutexattr_destroy(&attr);
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45 | # endif
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46 |
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47 | return lock;
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48 | }
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49 |
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50 | int CRYPTO_THREAD_read_lock(CRYPTO_RWLOCK *lock)
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51 | {
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52 | # ifdef USE_RWLOCK
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53 | if (pthread_rwlock_rdlock(lock) != 0)
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54 | return 0;
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55 | # else
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56 | if (pthread_mutex_lock(lock) != 0)
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57 | return 0;
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58 | # endif
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59 |
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60 | return 1;
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61 | }
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62 |
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63 | int CRYPTO_THREAD_write_lock(CRYPTO_RWLOCK *lock)
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64 | {
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65 | # ifdef USE_RWLOCK
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66 | if (pthread_rwlock_wrlock(lock) != 0)
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67 | return 0;
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68 | # else
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69 | if (pthread_mutex_lock(lock) != 0)
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70 | return 0;
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71 | # endif
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72 |
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73 | return 1;
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74 | }
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75 |
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76 | int CRYPTO_THREAD_unlock(CRYPTO_RWLOCK *lock)
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77 | {
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78 | # ifdef USE_RWLOCK
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79 | if (pthread_rwlock_unlock(lock) != 0)
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80 | return 0;
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81 | # else
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82 | if (pthread_mutex_unlock(lock) != 0)
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83 | return 0;
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84 | # endif
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85 |
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86 | return 1;
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87 | }
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88 |
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89 | void CRYPTO_THREAD_lock_free(CRYPTO_RWLOCK *lock)
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90 | {
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91 | if (lock == NULL)
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92 | return;
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93 |
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94 | # ifdef USE_RWLOCK
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95 | pthread_rwlock_destroy(lock);
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96 | # else
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97 | pthread_mutex_destroy(lock);
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98 | # endif
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99 | OPENSSL_free(lock);
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100 |
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101 | return;
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102 | }
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103 |
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104 | int CRYPTO_THREAD_run_once(CRYPTO_ONCE *once, void (*init)(void))
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105 | {
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106 | if (pthread_once(once, init) != 0)
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107 | return 0;
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108 |
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109 | return 1;
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110 | }
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111 |
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112 | int CRYPTO_THREAD_init_local(CRYPTO_THREAD_LOCAL *key, void (*cleanup)(void *))
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113 | {
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114 | if (pthread_key_create(key, cleanup) != 0)
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115 | return 0;
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116 |
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117 | return 1;
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118 | }
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119 |
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120 | void *CRYPTO_THREAD_get_local(CRYPTO_THREAD_LOCAL *key)
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121 | {
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122 | return pthread_getspecific(*key);
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123 | }
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124 |
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125 | int CRYPTO_THREAD_set_local(CRYPTO_THREAD_LOCAL *key, void *val)
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126 | {
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127 | if (pthread_setspecific(*key, val) != 0)
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128 | return 0;
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129 |
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130 | return 1;
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131 | }
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132 |
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133 | int CRYPTO_THREAD_cleanup_local(CRYPTO_THREAD_LOCAL *key)
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134 | {
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135 | if (pthread_key_delete(*key) != 0)
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136 | return 0;
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137 |
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138 | return 1;
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139 | }
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140 |
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141 | CRYPTO_THREAD_ID CRYPTO_THREAD_get_current_id(void)
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142 | {
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143 | return pthread_self();
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144 | }
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145 |
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146 | int CRYPTO_THREAD_compare_id(CRYPTO_THREAD_ID a, CRYPTO_THREAD_ID b)
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147 | {
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148 | return pthread_equal(a, b);
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149 | }
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150 |
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151 | int CRYPTO_atomic_add(int *val, int amount, int *ret, CRYPTO_RWLOCK *lock)
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152 | {
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153 | # if defined(__GNUC__) && defined(__ATOMIC_ACQ_REL)
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154 | if (__atomic_is_lock_free(sizeof(*val), val)) {
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155 | *ret = __atomic_add_fetch(val, amount, __ATOMIC_ACQ_REL);
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156 | return 1;
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157 | }
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158 | # endif
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159 | if (!CRYPTO_THREAD_write_lock(lock))
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160 | return 0;
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161 |
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162 | *val += amount;
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163 | *ret = *val;
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164 |
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165 | if (!CRYPTO_THREAD_unlock(lock))
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166 | return 0;
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167 |
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168 | return 1;
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169 | }
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170 |
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171 | #endif
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