int renderspuVBoxCompositorTryAcquire(WindowInfo *window, struct VBOXVR_SCR_COMPOSITOR **ppCompositor)
{
int rc = RTCritSectTryEnter(&window->CompositorLock);
if (RT_SUCCESS(rc))
{
*ppCompositor = window->pCompositor;
if (*ppCompositor)
return VINF_SUCCESS;
/* if no compositor is set, release the lock and return */
RTCritSectLeave(&window->CompositorLock);
rc = VERR_INVALID_STATE;
}
else
{
*ppCompositor = NULL;
}
return rc;
}
RTDECL(int) RTSemSpinMutexTryRequest(RTSEMSPINMUTEX hSpinMtx)
{
return RTCritSectTryEnter((PRTCRITSECT)hSpinMtx);
}
RTDECL(int) RTSemRWDestroy(RTSEMRW hRWSem)
{
struct RTSEMRWINTERNAL *pThis = hRWSem;
/*
* Validate handle.
*/
if (pThis == NIL_RTSEMRW)
return VINF_SUCCESS;
AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
AssertReturn(pThis->u32Magic == RTSEMRW_MAGIC, VERR_INVALID_HANDLE);
/*
* Check if busy.
*/
int rc = RTCritSectTryEnter(&pThis->CritSect);
if (RT_SUCCESS(rc))
{
if (!pThis->cReads && !pThis->cWrites)
{
/*
* Make it invalid and unusable.
*/
ASMAtomicWriteU32(&pThis->u32Magic, ~RTSEMRW_MAGIC);
pThis->cReads = ~0;
/*
* Do actual cleanup. None of these can now fail.
*/
rc = RTSemEventMultiDestroy(pThis->ReadEvent);
AssertMsgRC(rc, ("RTSemEventMultiDestroy failed! rc=%Rrc\n", rc));
pThis->ReadEvent = NIL_RTSEMEVENTMULTI;
rc = RTSemEventDestroy(pThis->WriteEvent);
AssertMsgRC(rc, ("RTSemEventDestroy failed! rc=%Rrc\n", rc));
pThis->WriteEvent = NIL_RTSEMEVENT;
RTCritSectLeave(&pThis->CritSect);
rc = RTCritSectDelete(&pThis->CritSect);
AssertMsgRC(rc, ("RTCritSectDelete failed! rc=%Rrc\n", rc));
#ifdef RTSEMRW_STRICT
RTLockValidatorRecSharedDelete(&pThis->ValidatorRead);
RTLockValidatorRecExclDelete(&pThis->ValidatorWrite);
#endif
RTMemFree(pThis);
rc = VINF_SUCCESS;
}
else
{
rc = VERR_SEM_BUSY;
RTCritSectLeave(&pThis->CritSect);
}
}
else
{
AssertMsgRC(rc, ("RTCritSectTryEnter failed! rc=%Rrc\n", rc));
rc = VERR_SEM_BUSY;
}
return rc;
}
