RTDECL(int) RTReqQueueProcess(RTREQQUEUE hQueue, RTMSINTERVAL cMillies)
{
LogFlow(("RTReqQueueProcess %x\n", hQueue));
/*
* Check input.
*/
PRTREQQUEUEINT pQueue = hQueue;
AssertPtrReturn(pQueue, VERR_INVALID_HANDLE);
AssertReturn(pQueue->u32Magic == RTREQQUEUE_MAGIC, VERR_INVALID_HANDLE);
/*
* Process loop. Stop (break) after the first non-VINF_SUCCESS status code.
*/
int rc = VINF_SUCCESS;
for (;;)
{
/*
* Get pending requests.
*/
PRTREQ pReqs = ASMAtomicXchgPtrT(&pQueue->pAlreadyPendingReqs, NULL, PRTREQ);
if (RT_LIKELY(!pReqs))
{
pReqs = ASMAtomicXchgPtrT(&pQueue->pReqs, NULL, PRTREQ);
if (!pReqs)
{
/* We do not adjust cMillies (documented behavior). */
ASMAtomicWriteBool(&pQueue->fBusy, false); /* this aint 100% perfect, but it's good enough for now... */
rc = RTSemEventWait(pQueue->EventSem, cMillies);
if (rc != VINF_SUCCESS)
break;
continue;
}
ASMAtomicWriteBool(&pQueue->fBusy, true);
/*
* Reverse the list to process it in FIFO order.
*/
PRTREQ pReq = pReqs;
if (pReq->pNext)
Log2(("RTReqQueueProcess: 2+ requests: %p %p %p\n", pReq, pReq->pNext, pReq->pNext->pNext));
pReqs = NULL;
while (pReq)
{
Assert(pReq->enmState == RTREQSTATE_QUEUED);
Assert(pReq->uOwner.hQueue == pQueue);
PRTREQ pCur = pReq;
pReq = pReq->pNext;
pCur->pNext = pReqs;
pReqs = pCur;
}
}
else
ASMAtomicWriteBool(&pQueue->fBusy, true);
/*
* Process the requests.
*/
while (pReqs)
{
/* Unchain the first request and advance the list. */
PRTREQ pReq = pReqs;
pReqs = pReqs->pNext;
pReq->pNext = NULL;
/* Process the request. */
rc = rtReqProcessOne(pReq);
AssertRC(rc);
if (rc != VINF_SUCCESS)
{
/* Propagate the return code to caller. If more requests pending, queue them for later. */
if (pReqs)
{
pReqs = ASMAtomicXchgPtrT(&pQueue->pAlreadyPendingReqs, pReqs, PRTREQ);
Assert(!pReqs);
}
break;
}
}
if (rc != VINF_SUCCESS)
break;
}
LogFlow(("RTReqQueueProcess: returns %Rrc\n", rc));
return rc;
}
RTDECL(int) RTReqQueueProcess(RTREQQUEUE hQueue, RTMSINTERVAL cMillies)
{
LogFlow(("RTReqQueueProcess %x\n", hQueue));
/*
* Check input.
*/
PRTREQQUEUEINT pQueue = hQueue;
AssertPtrReturn(pQueue, VERR_INVALID_HANDLE);
AssertReturn(pQueue->u32Magic == RTREQQUEUE_MAGIC, VERR_INVALID_HANDLE);
/*
* Process loop.
*
* We do not repeat the outer loop if we've got an informational status code
* since that code needs processing by our caller.
*/
int rc = VINF_SUCCESS;
while (rc <= VINF_SUCCESS)
{
/*
* Get pending requests.
*/
PRTREQ pReqs = ASMAtomicXchgPtrT(&pQueue->pReqs, NULL, PRTREQ);
if (!pReqs)
{
ASMAtomicWriteBool(&pQueue->fBusy, false); /* this aint 100% perfect, but it's good enough for now... */
/** @todo We currently don't care if the entire time wasted here is larger than
* cMillies */
rc = RTSemEventWait(pQueue->EventSem, cMillies);
if (rc != VINF_SUCCESS)
break;
continue;
}
ASMAtomicWriteBool(&pQueue->fBusy, true);
/*
* Reverse the list to process it in FIFO order.
*/
PRTREQ pReq = pReqs;
if (pReq->pNext)
Log2(("RTReqQueueProcess: 2+ requests: %p %p %p\n", pReq, pReq->pNext, pReq->pNext->pNext));
pReqs = NULL;
while (pReq)
{
Assert(pReq->enmState == RTREQSTATE_QUEUED);
Assert(pReq->uOwner.hQueue == pQueue);
PRTREQ pCur = pReq;
pReq = pReq->pNext;
pCur->pNext = pReqs;
pReqs = pCur;
}
/*
* Process the requests.
*/
while (pReqs)
{
/* Unchain the first request and advance the list. */
pReq = pReqs;
pReqs = pReqs->pNext;
pReq->pNext = NULL;
/* Process the request */
rc = rtReqProcessOne(pReq);
AssertRC(rc);
if (rc != VINF_SUCCESS)
break; /** @todo r=bird: we're dropping requests here! Add 2nd queue that can hold them. (will fix when writing a testcase) */
}
}
LogFlow(("RTReqQueueProcess: returns %Rrc\n", rc));
return rc;
}