[331] | 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 | #if defined(_WIN32)
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| 11 | # include <windows.h>
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| 12 | #endif
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| 13 |
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| 14 | #include <openssl/crypto.h>
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| 15 |
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| 16 | #if defined(OPENSSL_THREADS) && !defined(CRYPTO_TDEBUG) && defined(OPENSSL_SYS_WINDOWS)
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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 | CRYPTO_RWLOCK *lock = OPENSSL_zalloc(sizeof(CRITICAL_SECTION));
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| 21 | if (lock == NULL)
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| 22 | return NULL;
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| 23 |
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| 24 | /* 0x400 is the spin count value suggested in the documentation */
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| 25 | if (!InitializeCriticalSectionAndSpinCount(lock, 0x400)) {
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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 |
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| 30 | return lock;
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| 31 | }
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| 32 |
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| 33 | int CRYPTO_THREAD_read_lock(CRYPTO_RWLOCK *lock)
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| 34 | {
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| 35 | EnterCriticalSection(lock);
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| 36 | return 1;
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| 37 | }
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| 38 |
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| 39 | int CRYPTO_THREAD_write_lock(CRYPTO_RWLOCK *lock)
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| 40 | {
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| 41 | EnterCriticalSection(lock);
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| 42 | return 1;
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| 43 | }
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| 44 |
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| 45 | int CRYPTO_THREAD_unlock(CRYPTO_RWLOCK *lock)
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| 46 | {
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| 47 | LeaveCriticalSection(lock);
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| 48 | return 1;
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| 49 | }
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| 50 |
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| 51 | void CRYPTO_THREAD_lock_free(CRYPTO_RWLOCK *lock)
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| 52 | {
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| 53 | if (lock == NULL)
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| 54 | return;
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| 55 |
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| 56 | DeleteCriticalSection(lock);
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| 57 | OPENSSL_free(lock);
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| 58 |
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| 59 | return;
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| 60 | }
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| 61 |
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| 62 | # define ONCE_UNINITED 0
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| 63 | # define ONCE_ININIT 1
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| 64 | # define ONCE_DONE 2
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| 65 |
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| 66 | /*
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| 67 | * We don't use InitOnceExecuteOnce because that isn't available in WinXP which
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| 68 | * we still have to support.
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| 69 | */
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| 70 | int CRYPTO_THREAD_run_once(CRYPTO_ONCE *once, void (*init)(void))
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| 71 | {
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| 72 | LONG volatile *lock = (LONG *)once;
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| 73 | LONG result;
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| 74 |
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| 75 | if (*lock == ONCE_DONE)
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| 76 | return 1;
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| 77 |
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| 78 | do {
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| 79 | result = InterlockedCompareExchange(lock, ONCE_ININIT, ONCE_UNINITED);
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| 80 | if (result == ONCE_UNINITED) {
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| 81 | init();
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| 82 | *lock = ONCE_DONE;
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| 83 | return 1;
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| 84 | }
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| 85 | } while (result == ONCE_ININIT);
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| 86 |
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| 87 | return (*lock == ONCE_DONE);
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| 88 | }
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| 89 |
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| 90 | int CRYPTO_THREAD_init_local(CRYPTO_THREAD_LOCAL *key, void (*cleanup)(void *))
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| 91 | {
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| 92 | *key = TlsAlloc();
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| 93 | if (*key == TLS_OUT_OF_INDEXES)
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| 94 | return 0;
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| 95 |
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| 96 | return 1;
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| 97 | }
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| 98 |
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| 99 | void *CRYPTO_THREAD_get_local(CRYPTO_THREAD_LOCAL *key)
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| 100 | {
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| 101 | return TlsGetValue(*key);
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| 102 | }
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| 103 |
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| 104 | int CRYPTO_THREAD_set_local(CRYPTO_THREAD_LOCAL *key, void *val)
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| 105 | {
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| 106 | if (TlsSetValue(*key, val) == 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_cleanup_local(CRYPTO_THREAD_LOCAL *key)
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| 113 | {
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| 114 | if (TlsFree(*key) == 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 | CRYPTO_THREAD_ID CRYPTO_THREAD_get_current_id(void)
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| 121 | {
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| 122 | return GetCurrentThreadId();
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| 123 | }
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| 124 |
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| 125 | int CRYPTO_THREAD_compare_id(CRYPTO_THREAD_ID a, CRYPTO_THREAD_ID b)
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| 126 | {
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| 127 | return (a == b);
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| 128 | }
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| 129 |
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| 130 | int CRYPTO_atomic_add(int *val, int amount, int *ret, CRYPTO_RWLOCK *lock)
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| 131 | {
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| 132 | *ret = InterlockedExchangeAdd(val, amount) + amount;
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| 133 | return 1;
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| 134 | }
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| 135 |
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| 136 | #endif
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