2 * Copyright 2016-2021 The OpenSSL Project Authors. All Rights Reserved.
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
12 # if defined(_WIN32_WINNT) && _WIN32_WINNT >= 0x600
17 #include <openssl/crypto.h>
19 #if defined(OPENSSL_THREADS) && !defined(CRYPTO_TDEBUG) && defined(OPENSSL_SYS_WINDOWS)
28 CRYPTO_RWLOCK *CRYPTO_THREAD_lock_new(void)
32 CRYPTO_win_rwlock *rwlock;
34 if ((lock = OPENSSL_zalloc(sizeof(CRYPTO_win_rwlock))) == NULL)
37 InitializeSRWLock(&rwlock->lock);
40 if ((lock = OPENSSL_zalloc(sizeof(CRITICAL_SECTION))) == NULL) {
41 /* Don't set error, to avoid recursion blowup. */
45 # if !defined(_WIN32_WCE)
46 /* 0x400 is the spin count value suggested in the documentation */
47 if (!InitializeCriticalSectionAndSpinCount(lock, 0x400)) {
52 InitializeCriticalSection(lock);
59 __owur int CRYPTO_THREAD_read_lock(CRYPTO_RWLOCK *lock)
62 CRYPTO_win_rwlock *rwlock = lock;
64 AcquireSRWLockShared(&rwlock->lock);
66 EnterCriticalSection(lock);
71 __owur int CRYPTO_THREAD_write_lock(CRYPTO_RWLOCK *lock)
74 CRYPTO_win_rwlock *rwlock = lock;
76 AcquireSRWLockExclusive(&rwlock->lock);
77 rwlock->exclusive = 1;
79 EnterCriticalSection(lock);
84 int CRYPTO_THREAD_unlock(CRYPTO_RWLOCK *lock)
87 CRYPTO_win_rwlock *rwlock = lock;
89 if (rwlock->exclusive) {
90 rwlock->exclusive = 0;
91 ReleaseSRWLockExclusive(&rwlock->lock);
93 ReleaseSRWLockShared(&rwlock->lock);
96 LeaveCriticalSection(lock);
101 void CRYPTO_THREAD_lock_free(CRYPTO_RWLOCK *lock)
107 DeleteCriticalSection(lock);
114 # define ONCE_UNINITED 0
115 # define ONCE_ININIT 1
119 * We don't use InitOnceExecuteOnce because that isn't available in WinXP which
120 * we still have to support.
122 int CRYPTO_THREAD_run_once(CRYPTO_ONCE *once, void (*init)(void))
124 LONG volatile *lock = (LONG *)once;
127 if (*lock == ONCE_DONE)
131 result = InterlockedCompareExchange(lock, ONCE_ININIT, ONCE_UNINITED);
132 if (result == ONCE_UNINITED) {
137 } while (result == ONCE_ININIT);
139 return (*lock == ONCE_DONE);
142 int CRYPTO_THREAD_init_local(CRYPTO_THREAD_LOCAL *key, void (*cleanup)(void *))
145 if (*key == TLS_OUT_OF_INDEXES)
151 void *CRYPTO_THREAD_get_local(CRYPTO_THREAD_LOCAL *key)
157 * TlsGetValue clears the last error even on success, so that callers may
158 * distinguish it successfully returning NULL or failing. It is documented
159 * to never fail if the argument is a valid index from TlsAlloc, so we do
160 * not need to handle this.
162 * However, this error-mangling behavior interferes with the caller's use of
163 * GetLastError. In particular SSL_get_error queries the error queue to
164 * determine whether the caller should look at the OS's errors. To avoid
165 * destroying state, save and restore the Windows error.
167 * https://msdn.microsoft.com/en-us/library/windows/desktop/ms686812(v=vs.85).aspx
169 last_error = GetLastError();
170 ret = TlsGetValue(*key);
171 SetLastError(last_error);
175 int CRYPTO_THREAD_set_local(CRYPTO_THREAD_LOCAL *key, void *val)
177 if (TlsSetValue(*key, val) == 0)
183 int CRYPTO_THREAD_cleanup_local(CRYPTO_THREAD_LOCAL *key)
185 if (TlsFree(*key) == 0)
191 CRYPTO_THREAD_ID CRYPTO_THREAD_get_current_id(void)
193 return GetCurrentThreadId();
196 int CRYPTO_THREAD_compare_id(CRYPTO_THREAD_ID a, CRYPTO_THREAD_ID b)
201 int CRYPTO_atomic_add(int *val, int amount, int *ret, CRYPTO_RWLOCK *lock)
203 *ret = (int)InterlockedExchangeAdd((long volatile *)val, (long)amount) + amount;
207 int CRYPTO_atomic_or(uint64_t *val, uint64_t op, uint64_t *ret,
210 *ret = (uint64_t)InterlockedOr64((LONG64 volatile *)val, (LONG64)op) | op;
214 int CRYPTO_atomic_load(uint64_t *val, uint64_t *ret, CRYPTO_RWLOCK *lock)
216 *ret = (uint64_t)InterlockedOr64((LONG64 volatile *)val, 0);
220 int openssl_init_fork_handlers(void)
225 int openssl_get_fork_id(void)