2 * Copyright 2016-2018 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (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
14 #include <openssl/crypto.h>
16 #if defined(OPENSSL_THREADS) && !defined(CRYPTO_TDEBUG) && defined(OPENSSL_SYS_WINDOWS)
18 CRYPTO_RWLOCK *CRYPTO_THREAD_lock_new(void)
22 if ((lock = OPENSSL_zalloc(sizeof(CRITICAL_SECTION))) == NULL) {
23 /* Don't set error, to avoid recursion blowup. */
27 /* 0x400 is the spin count value suggested in the documentation */
28 if (!InitializeCriticalSectionAndSpinCount(lock, 0x400)) {
36 int CRYPTO_THREAD_read_lock(CRYPTO_RWLOCK *lock)
38 EnterCriticalSection(lock);
42 int CRYPTO_THREAD_write_lock(CRYPTO_RWLOCK *lock)
44 EnterCriticalSection(lock);
48 int CRYPTO_THREAD_unlock(CRYPTO_RWLOCK *lock)
50 LeaveCriticalSection(lock);
54 void CRYPTO_THREAD_lock_free(CRYPTO_RWLOCK *lock)
59 DeleteCriticalSection(lock);
65 # define ONCE_UNINITED 0
66 # define ONCE_ININIT 1
70 * We don't use InitOnceExecuteOnce because that isn't available in WinXP which
71 * we still have to support.
73 int CRYPTO_THREAD_run_once(CRYPTO_ONCE *once, void (*init)(void))
75 LONG volatile *lock = (LONG *)once;
78 if (*lock == ONCE_DONE)
82 result = InterlockedCompareExchange(lock, ONCE_ININIT, ONCE_UNINITED);
83 if (result == ONCE_UNINITED) {
88 } while (result == ONCE_ININIT);
90 return (*lock == ONCE_DONE);
93 int CRYPTO_THREAD_init_local(CRYPTO_THREAD_LOCAL *key, void (*cleanup)(void *))
96 if (*key == TLS_OUT_OF_INDEXES)
102 void *CRYPTO_THREAD_get_local(CRYPTO_THREAD_LOCAL *key)
108 * TlsGetValue clears the last error even on success, so that callers may
109 * distinguish it successfully returning NULL or failing. It is documented
110 * to never fail if the argument is a valid index from TlsAlloc, so we do
111 * not need to handle this.
113 * However, this error-mangling behavior interferes with the caller's use of
114 * GetLastError. In particular SSL_get_error queries the error queue to
115 * determine whether the caller should look at the OS's errors. To avoid
116 * destroying state, save and restore the Windows error.
118 * https://msdn.microsoft.com/en-us/library/windows/desktop/ms686812(v=vs.85).aspx
120 last_error = GetLastError();
121 ret = TlsGetValue(*key);
122 SetLastError(last_error);
126 int CRYPTO_THREAD_set_local(CRYPTO_THREAD_LOCAL *key, void *val)
128 if (TlsSetValue(*key, val) == 0)
134 int CRYPTO_THREAD_cleanup_local(CRYPTO_THREAD_LOCAL *key)
136 if (TlsFree(*key) == 0)
142 CRYPTO_THREAD_ID CRYPTO_THREAD_get_current_id(void)
144 return GetCurrentThreadId();
147 int CRYPTO_THREAD_compare_id(CRYPTO_THREAD_ID a, CRYPTO_THREAD_ID b)
152 int CRYPTO_atomic_add(int *val, int amount, int *ret, CRYPTO_RWLOCK *lock)
154 *ret = InterlockedExchangeAdd(val, amount) + amount;
158 int CRYPTO_atomic_read(int *val, int *ret, CRYPTO_RWLOCK *lock)
160 *ret = InterlockedCompareExchange(val, 0, 0);
164 int CRYPTO_atomic_write(int *val, int n, CRYPTO_RWLOCK *lock)
166 InterlockedExchange(val, n);
170 int openssl_init_fork_handlers(void)