RTDECL(bool) RTSemRWIsReadOwner(RTSEMRW hRWSem, bool fWannaHear)
{
/*
* Validate handle.
*/
struct RTSEMRWINTERNAL *pThis = hRWSem;
AssertPtrReturn(pThis, false);
AssertReturn(pThis->u32Magic == RTSEMRW_MAGIC, false);
/*
* Check write ownership. The writer is also a valid reader.
*/
pthread_t Self = pthread_self();
pthread_t Writer;
ATOMIC_GET_PTHREAD_T(&pThis->Writer, &Writer);
if (Writer == Self)
return true;
if (Writer != (pthread_t)-1)
return false;
/*
* If there are no readers, we cannot be one of them, can we?
*/
if (ASMAtomicReadU32(&pThis->cReaders) == 0)
return false;
#ifdef RTSEMRW_STRICT
/*
* Ask the lock validator.
*/
NOREF(fWannaHear);
return RTLockValidatorRecSharedIsOwner(&pThis->ValidatorRead, NIL_RTTHREAD);
#else
/*
* Just tell the caller what he want to hear.
*/
return fWannaHear;
#endif
}
RTDECL(bool) RTSemRWIsReadOwner(RTSEMRW hRWSem, bool fWannaHear)
{
/*
* Validate handle.
*/
struct RTSEMRWINTERNAL *pThis = hRWSem;
AssertPtrReturn(pThis, false);
AssertReturn(pThis->u32Magic == RTSEMRW_MAGIC, false);
/*
* Check write ownership. The writer is also a valid reader.
*/
RTNATIVETHREAD hNativeSelf = RTThreadNativeSelf();
RTNATIVETHREAD hWriter;
ASMAtomicUoReadHandle(&pThis->hWriter, &hWriter);
if (hWriter == hNativeSelf)
return true;
if (hWriter != NIL_RTNATIVETHREAD)
return false;
#ifdef RTSEMRW_STRICT
/*
* Ask the lock validator.
*/
NOREF(fWannaHear);
return RTLockValidatorRecSharedIsOwner(&pThis->ValidatorRead, NIL_RTTHREAD);
#else
/*
* If there are no reads we cannot be one of them... But if there are we
* cannot know and can only return what the caller want to hear.
*/
if (pThis->cReads == 0)
return false;
return fWannaHear;
#endif
}
