RTDECL(int) RTSemEventDestroy(RTSEMEVENT hEventSem)
{
IPRT_LINUX_SAVE_EFL_AC();
/*
* Validate input.
*/
PRTSEMEVENTINTERNAL pThis = hEventSem;
if (pThis == NIL_RTSEMEVENT)
return VINF_SUCCESS;
AssertMsgReturn(pThis->u32Magic == RTSEMEVENT_MAGIC, ("pThis->u32Magic=%RX32 pThis=%p\n", pThis->u32Magic, pThis), VERR_INVALID_HANDLE);
Assert(pThis->cRefs > 0);
/*
* Invalidate it and signal the object just in case.
*/
ASMAtomicWriteU32(&pThis->u32Magic, ~RTSEMEVENT_MAGIC);
ASMAtomicWriteU32(&pThis->fState, 0);
Assert(!waitqueue_active(&pThis->Head));
wake_up_all(&pThis->Head);
rtR0SemEventLnxRelease(pThis);
IPRT_LINUX_RESTORE_EFL_AC();
return VINF_SUCCESS;
}
RTDECL(int) RTSemEventSignal(RTSEMEVENT hEventSem)
{
/*
* Validate input.
*/
PRTSEMEVENTINTERNAL pThis = (PRTSEMEVENTINTERNAL)hEventSem;
AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
AssertMsgReturn(pThis->u32Magic == RTSEMEVENT_MAGIC, ("pThis->u32Magic=%RX32 pThis=%p\n", pThis->u32Magic, pThis), VERR_INVALID_HANDLE);
rtR0SemEventLnxRetain(pThis);
/*
* Signal the event object.
*/
ASMAtomicWriteU32(&pThis->fState, 1);
wake_up(&pThis->Head);
rtR0SemEventLnxRelease(pThis);
return VINF_SUCCESS;
}
/**
* Worker for RTSemEventWaitEx and RTSemEventWaitExDebug.
*
* @returns VBox status code.
* @param pThis The event semaphore.
* @param fFlags See RTSemEventWaitEx.
* @param uTimeout See RTSemEventWaitEx.
* @param pSrcPos The source code position of the wait.
*/
static int rtR0SemEventLnxWait(PRTSEMEVENTINTERNAL pThis, uint32_t fFlags, uint64_t uTimeout,
PCRTLOCKVALSRCPOS pSrcPos)
{
int rc;
/*
* Validate the input.
*/
AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
AssertMsgReturn(pThis->u32Magic == RTSEMEVENT_MAGIC, ("%p u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_PARAMETER);
AssertReturn(RTSEMWAIT_FLAGS_ARE_VALID(fFlags), VERR_INVALID_PARAMETER);
rtR0SemEventLnxRetain(pThis);
/*
* Try grab the event without setting up the wait.
*/
if ( 1 /** @todo check if there are someone waiting already - waitqueue_active, but then what do we do below? */
&& ASMAtomicCmpXchgU32(&pThis->fState, 0, 1))
rc = VINF_SUCCESS;
else
{
/*
* We have to wait.
*/
RTR0SEMLNXWAIT Wait;
rc = rtR0SemLnxWaitInit(&Wait, fFlags, uTimeout, &pThis->Head);
if (RT_SUCCESS(rc))
{
IPRT_DEBUG_SEMS_STATE(pThis, 'E');
for (;;)
{
/* The destruction test. */
if (RT_UNLIKELY(pThis->u32Magic != RTSEMEVENT_MAGIC))
rc = VERR_SEM_DESTROYED;
else
{
rtR0SemLnxWaitPrepare(&Wait);
/* Check the exit conditions. */
if (RT_UNLIKELY(pThis->u32Magic != RTSEMEVENT_MAGIC))
rc = VERR_SEM_DESTROYED;
else if (ASMAtomicCmpXchgU32(&pThis->fState, 0, 1))
rc = VINF_SUCCESS;
else if (rtR0SemLnxWaitHasTimedOut(&Wait))
rc = VERR_TIMEOUT;
else if (rtR0SemLnxWaitWasInterrupted(&Wait))
rc = VERR_INTERRUPTED;
else
{
/* Do the wait and then recheck the conditions. */
rtR0SemLnxWaitDoIt(&Wait);
continue;
}
}
break;
}
rtR0SemLnxWaitDelete(&Wait);
IPRT_DEBUG_SEMS_STATE_RC(pThis, 'E', rc);
}
}
rtR0SemEventLnxRelease(pThis);
return rc;
}