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git.ipfire.org Git - thirdparty/openssl.git/blob - crypto/threads_win.c
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
13 # include <synchapi.h>
18 #include <openssl/crypto.h>
20 #if defined(OPENSSL_THREADS) && !defined(CRYPTO_TDEBUG) && defined(OPENSSL_SYS_WINDOWS)
29 CRYPTO_RWLOCK
*CRYPTO_THREAD_lock_new(void)
33 CRYPTO_win_rwlock
*rwlock
;
35 if ((lock
= OPENSSL_zalloc(sizeof(CRYPTO_win_rwlock
))) == NULL
)
38 InitializeSRWLock(&rwlock
->lock
);
41 if ((lock
= OPENSSL_zalloc(sizeof(CRITICAL_SECTION
))) == NULL
) {
42 /* Don't set error, to avoid recursion blowup. */
46 # if !defined(_WIN32_WCE)
47 /* 0x400 is the spin count value suggested in the documentation */
48 if (!InitializeCriticalSectionAndSpinCount(lock
, 0x400)) {
53 InitializeCriticalSection(lock
);
60 __owur
int CRYPTO_THREAD_read_lock(CRYPTO_RWLOCK
*lock
)
63 CRYPTO_win_rwlock
*rwlock
= lock
;
65 AcquireSRWLockShared(&rwlock
->lock
);
67 EnterCriticalSection(lock
);
72 __owur
int CRYPTO_THREAD_write_lock(CRYPTO_RWLOCK
*lock
)
75 CRYPTO_win_rwlock
*rwlock
= lock
;
77 AcquireSRWLockExclusive(&rwlock
->lock
);
78 rwlock
->exclusive
= 1;
80 EnterCriticalSection(lock
);
85 int CRYPTO_THREAD_unlock(CRYPTO_RWLOCK
*lock
)
88 CRYPTO_win_rwlock
*rwlock
= lock
;
90 if (rwlock
->exclusive
) {
91 rwlock
->exclusive
= 0;
92 ReleaseSRWLockExclusive(&rwlock
->lock
);
94 ReleaseSRWLockShared(&rwlock
->lock
);
97 LeaveCriticalSection(lock
);
102 void CRYPTO_THREAD_lock_free(CRYPTO_RWLOCK
*lock
)
108 DeleteCriticalSection(lock
);
115 # define ONCE_UNINITED 0
116 # define ONCE_ININIT 1
120 * We don't use InitOnceExecuteOnce because that isn't available in WinXP which
121 * we still have to support.
123 int CRYPTO_THREAD_run_once(CRYPTO_ONCE
*once
, void (*init
)(void))
125 LONG
volatile *lock
= (LONG
*)once
;
128 if (*lock
== ONCE_DONE
)
132 result
= InterlockedCompareExchange(lock
, ONCE_ININIT
, ONCE_UNINITED
);
133 if (result
== ONCE_UNINITED
) {
138 } while (result
== ONCE_ININIT
);
140 return (*lock
== ONCE_DONE
);
143 int CRYPTO_THREAD_init_local(CRYPTO_THREAD_LOCAL
*key
, void (*cleanup
)(void *))
146 if (*key
== TLS_OUT_OF_INDEXES
)
152 void *CRYPTO_THREAD_get_local(CRYPTO_THREAD_LOCAL
*key
)
158 * TlsGetValue clears the last error even on success, so that callers may
159 * distinguish it successfully returning NULL or failing. It is documented
160 * to never fail if the argument is a valid index from TlsAlloc, so we do
161 * not need to handle this.
163 * However, this error-mangling behavior interferes with the caller's use of
164 * GetLastError. In particular SSL_get_error queries the error queue to
165 * determine whether the caller should look at the OS's errors. To avoid
166 * destroying state, save and restore the Windows error.
168 * https://msdn.microsoft.com/en-us/library/windows/desktop/ms686812(v=vs.85).aspx
170 last_error
= GetLastError();
171 ret
= TlsGetValue(*key
);
172 SetLastError(last_error
);
176 int CRYPTO_THREAD_set_local(CRYPTO_THREAD_LOCAL
*key
, void *val
)
178 if (TlsSetValue(*key
, val
) == 0)
184 int CRYPTO_THREAD_cleanup_local(CRYPTO_THREAD_LOCAL
*key
)
186 if (TlsFree(*key
) == 0)
192 CRYPTO_THREAD_ID
CRYPTO_THREAD_get_current_id(void)
194 return GetCurrentThreadId();
197 int CRYPTO_THREAD_compare_id(CRYPTO_THREAD_ID a
, CRYPTO_THREAD_ID b
)
202 int CRYPTO_atomic_add(int *val
, int amount
, int *ret
, CRYPTO_RWLOCK
*lock
)
204 *ret
= (int)InterlockedExchangeAdd((long volatile *)val
, (long)amount
) + amount
;
208 int CRYPTO_atomic_or(uint64_t *val
, uint64_t op
, uint64_t *ret
,
211 *ret
= (uint64_t)InterlockedOr64((LONG64
volatile *)val
, (LONG64
)op
) | op
;
215 int CRYPTO_atomic_load(uint64_t *val
, uint64_t *ret
, CRYPTO_RWLOCK
*lock
)
217 *ret
= (uint64_t)InterlockedOr64((LONG64
volatile *)val
, 0);
221 int openssl_init_fork_handlers(void)
226 int openssl_get_fork_id(void)