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/*
* Copyright 2016-2021 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#if defined(_WIN32)
# include <windows.h>
# if defined(_WIN32_WINNT) && _WIN32_WINNT >= 0x600
# include <synchapi.h>
# define USE_RWLOCK
# endif
#endif
#include <openssl/crypto.h>
#if defined(OPENSSL_THREADS) && !defined(CRYPTO_TDEBUG) && defined(OPENSSL_SYS_WINDOWS)
# ifdef USE_RWLOCK
typedef struct {
SRWLOCK lock;
int exclusive;
} CRYPTO_win_rwlock;
# endif
CRYPTO_RWLOCK *CRYPTO_THREAD_lock_new(void)
{
CRYPTO_RWLOCK *lock;
# ifdef USE_RWLOCK
CRYPTO_win_rwlock *rwlock;
if ((lock = OPENSSL_zalloc(sizeof(CRYPTO_win_rwlock))) == NULL)
return NULL;
rwlock = lock;
InitializeSRWLock(&rwlock->lock);
# else
if ((lock = OPENSSL_zalloc(sizeof(CRITICAL_SECTION))) == NULL) {
/* Don't set error, to avoid recursion blowup. */
return NULL;
}
# if !defined(_WIN32_WCE)
/* 0x400 is the spin count value suggested in the documentation */
if (!InitializeCriticalSectionAndSpinCount(lock, 0x400)) {
OPENSSL_free(lock);
return NULL;
}
# else
InitializeCriticalSection(lock);
# endif
# endif
return lock;
}
__owur int CRYPTO_THREAD_read_lock(CRYPTO_RWLOCK *lock)
{
# ifdef USE_RWLOCK
CRYPTO_win_rwlock *rwlock = lock;
AcquireSRWLockShared(&rwlock->lock);
# else
EnterCriticalSection(lock);
# endif
return 1;
}
__owur int CRYPTO_THREAD_write_lock(CRYPTO_RWLOCK *lock)
{
# ifdef USE_RWLOCK
CRYPTO_win_rwlock *rwlock = lock;
AcquireSRWLockExclusive(&rwlock->lock);
rwlock->exclusive = 1;
# else
EnterCriticalSection(lock);
# endif
return 1;
}
int CRYPTO_THREAD_unlock(CRYPTO_RWLOCK *lock)
{
# ifdef USE_RWLOCK
CRYPTO_win_rwlock *rwlock = lock;
if (rwlock->exclusive) {
rwlock->exclusive = 0;
ReleaseSRWLockExclusive(&rwlock->lock);
} else {
ReleaseSRWLockShared(&rwlock->lock);
}
# else
LeaveCriticalSection(lock);
# endif
return 1;
}
void CRYPTO_THREAD_lock_free(CRYPTO_RWLOCK *lock)
{
if (lock == NULL)
return;
# ifndef USE_RWLOCK
DeleteCriticalSection(lock);
# endif
OPENSSL_free(lock);
return;
}
# define ONCE_UNINITED 0
# define ONCE_ININIT 1
# define ONCE_DONE 2
/*
* We don't use InitOnceExecuteOnce because that isn't available in WinXP which
* we still have to support.
*/
int CRYPTO_THREAD_run_once(CRYPTO_ONCE *once, void (*init)(void))
{
LONG volatile *lock = (LONG *)once;
LONG result;
if (*lock == ONCE_DONE)
return 1;
do {
result = InterlockedCompareExchange(lock, ONCE_ININIT, ONCE_UNINITED);
if (result == ONCE_UNINITED) {
init();
*lock = ONCE_DONE;
return 1;
}
} while (result == ONCE_ININIT);
return (*lock == ONCE_DONE);
}
int CRYPTO_THREAD_init_local(CRYPTO_THREAD_LOCAL *key, void (*cleanup)(void *))
{
*key = TlsAlloc();
if (*key == TLS_OUT_OF_INDEXES)
return 0;
return 1;
}
void *CRYPTO_THREAD_get_local(CRYPTO_THREAD_LOCAL *key)
{
DWORD last_error;
void *ret;
/*
* TlsGetValue clears the last error even on success, so that callers may
* distinguish it successfully returning NULL or failing. It is documented
* to never fail if the argument is a valid index from TlsAlloc, so we do
* not need to handle this.
*
* However, this error-mangling behavior interferes with the caller's use of
* GetLastError. In particular SSL_get_error queries the error queue to
* determine whether the caller should look at the OS's errors. To avoid
* destroying state, save and restore the Windows error.
*
* https://msdn.microsoft.com/en-us/library/windows/desktop/ms686812(v=vs.85).aspx
*/
last_error = GetLastError();
ret = TlsGetValue(*key);
SetLastError(last_error);
return ret;
}
int CRYPTO_THREAD_set_local(CRYPTO_THREAD_LOCAL *key, void *val)
{
if (TlsSetValue(*key, val) == 0)
return 0;
return 1;
}
int CRYPTO_THREAD_cleanup_local(CRYPTO_THREAD_LOCAL *key)
{
if (TlsFree(*key) == 0)
return 0;
return 1;
}
CRYPTO_THREAD_ID CRYPTO_THREAD_get_current_id(void)
{
return GetCurrentThreadId();
}
int CRYPTO_THREAD_compare_id(CRYPTO_THREAD_ID a, CRYPTO_THREAD_ID b)
{
return (a == b);
}
int CRYPTO_atomic_add(int *val, int amount, int *ret, CRYPTO_RWLOCK *lock)
{
*ret = (int)InterlockedExchangeAdd((long volatile *)val, (long)amount) + amount;
return 1;
}
int CRYPTO_atomic_or(uint64_t *val, uint64_t op, uint64_t *ret,
CRYPTO_RWLOCK *lock)
{
*ret = (uint64_t)InterlockedOr64((LONG64 volatile *)val, (LONG64)op) | op;
return 1;
}
int CRYPTO_atomic_load(uint64_t *val, uint64_t *ret, CRYPTO_RWLOCK *lock)
{
*ret = (uint64_t)InterlockedOr64((LONG64 volatile *)val, 0);
return 1;
}
int openssl_init_fork_handlers(void)
{
return 0;
}
int openssl_get_fork_id(void)
{
return 0;
}
#endif
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