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ntdll: Implement RtlTryAcquireSRWLockShared/Exclusive commands.

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Sebastian Lackner 2014-01-21 22:18:10 +01:00 committed by Alexandre Julliard
parent 8ca96a9de0
commit 899fc8d4ee
3 changed files with 37 additions and 0 deletions
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2
dlls/ntdll/ntdll.spec
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@ -891,6 +891,8 @@
# @ stub RtlTraceDatabaseLock
# @ stub RtlTraceDatabaseUnlock
# @ stub RtlTraceDatabaseValidate
@ stdcall RtlTryAcquireSRWLockExclusive(ptr)
@ stdcall RtlTryAcquireSRWLockShared(ptr)
@ stdcall RtlTryEnterCriticalSection(ptr)
@ cdecl -i386 -norelay RtlUlongByteSwap() NTDLL_RtlUlongByteSwap
@ cdecl -ret64 RtlUlonglongByteSwap(int64)

33
dlls/ntdll/sync.c
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@ -1535,6 +1535,10 @@ void WINAPI RtlAcquireSRWLockExclusive( RTL_SRWLOCK *lock )
/***********************************************************************
* RtlAcquireSRWLockShared (NTDLL.@)
*
* NOTES
* Do not call this function recursively - it will only succeed when
* there are no threads waiting for an exclusive lock!
*/
void WINAPI RtlAcquireSRWLockShared( RTL_SRWLOCK *lock )
{
@ -1582,6 +1586,35 @@ void WINAPI RtlReleaseSRWLockShared( RTL_SRWLOCK *lock )
- SRWLOCK_RES_SHARED ) - SRWLOCK_RES_SHARED );
}
/***********************************************************************
* RtlTryAcquireSRWLockExclusive (NTDLL.@)
*
* NOTES
* Similar to AcquireSRWLockExclusive recusive calls are not allowed
* and will fail with return value FALSE.
*/
BOOLEAN WINAPI RtlTryAcquireSRWLockExclusive( RTL_SRWLOCK *lock )
{
return interlocked_cmpxchg( (int *)&lock->Ptr, SRWLOCK_MASK_IN_EXCLUSIVE |
SRWLOCK_RES_EXCLUSIVE, 0 ) == 0;
}
/***********************************************************************
* RtlTryAcquireSRWLockShared (NTDLL.@)
*/
BOOLEAN WINAPI RtlTryAcquireSRWLockShared( RTL_SRWLOCK *lock )
{
unsigned int val, tmp;
for (val = *(unsigned int *)&lock->Ptr;; val = tmp)
{
if (val & SRWLOCK_MASK_EXCLUSIVE_QUEUE)
return FALSE;
if ((tmp = interlocked_cmpxchg( (int *)&lock->Ptr, val + SRWLOCK_RES_SHARED, val )) == val)
break;
}
return TRUE;
}
/***********************************************************************
* RtlInitializeConditionVariable (NTDLL.@)
*

2
include/winternl.h
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@ -2512,6 +2512,8 @@ NTSYSAPI BOOLEAN WINAPI RtlTimeFieldsToTime(PTIME_FIELDS,PLARGE_INTEGER);
NTSYSAPI void WINAPI RtlTimeToElapsedTimeFields(const LARGE_INTEGER *,PTIME_FIELDS);
NTSYSAPI BOOLEAN WINAPI RtlTimeToSecondsSince1970(const LARGE_INTEGER *,LPDWORD);
NTSYSAPI BOOLEAN WINAPI RtlTimeToSecondsSince1980(const LARGE_INTEGER *,LPDWORD);
NTSYSAPI BOOLEAN WINAPI RtlTryAcquireSRWLockExclusive(RTL_SRWLOCK *);
NTSYSAPI BOOLEAN WINAPI RtlTryAcquireSRWLockShared(RTL_SRWLOCK *);
NTSYSAPI BOOL WINAPI RtlTryEnterCriticalSection(RTL_CRITICAL_SECTION *);
NTSYSAPI ULONGLONG __cdecl RtlUlonglongByteSwap(ULONGLONG);
NTSYSAPI DWORD WINAPI RtlUnicodeStringToAnsiSize(const UNICODE_STRING*);