RTDECL(int)  RTSemEventMultiSignal(RTSEMEVENTMULTI hEventMultiSem)
{
    uint32_t fNew;
    uint32_t fOld;

    /*
     * Validate input.
     */
    PRTSEMEVENTMULTIINTERNAL pThis = (PRTSEMEVENTMULTIINTERNAL)hEventMultiSem;
    if (!pThis)
        return VERR_INVALID_PARAMETER;
    AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
    AssertMsgReturn(pThis->u32Magic == RTSEMEVENTMULTI_MAGIC, ("%p u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_PARAMETER);
    rtR0SemEventMultiBsdRetain(pThis);

    /*
     * Signal the event object.  The cause of the parnoia here is racing to try
     * deal with racing RTSemEventMultiSignal calls (should probably be
     * forbidden, but it's relatively easy to handle).
     */
    do
    {
        fNew = fOld = ASMAtomicUoReadU32(&pThis->fStateAndGen);
        fNew += 1 << RTSEMEVENTMULTIBSD_GEN_SHIFT;
        fNew |= RTSEMEVENTMULTIBSD_STATE_MASK;
    }
    while (!ASMAtomicCmpXchgU32(&pThis->fStateAndGen, fNew, fOld));

    rtR0SemBsdBroadcast(pThis);
    rtR0SemEventMultiBsdRelease(pThis);
    return VINF_SUCCESS;
}
コード例 #2
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RTDECL(int)  RTSemEventDestroy(RTSEMEVENT hEventSem)
{
    /*
     * 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);
    rtR0SemBsdBroadcast(pThis);
    rtR0SemEventBsdRelease(pThis);
    return VINF_SUCCESS;
}
RTDECL(int)  RTSemEventMultiDestroy(RTSEMEVENTMULTI hEventMultiSem)
{
    /*
     * Validate input.
     */
    PRTSEMEVENTMULTIINTERNAL pThis = (PRTSEMEVENTMULTIINTERNAL)hEventMultiSem;
    if (pThis == NIL_RTSEMEVENTMULTI)
        return VINF_SUCCESS;
    AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
    AssertMsgReturn(pThis->u32Magic == RTSEMEVENTMULTI_MAGIC, ("%p u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_PARAMETER);
    Assert(pThis->cRefs > 0);

    /*
     * Invalidate it and signal the object just in case.
     */
    ASMAtomicWriteU32(&pThis->u32Magic, ~RTSEMEVENTMULTI_MAGIC);
    ASMAtomicAndU32(&pThis->fStateAndGen, RTSEMEVENTMULTIBSD_GEN_MASK);
    rtR0SemBsdBroadcast(pThis);
    rtR0SemEventMultiBsdRelease(pThis);
    return VINF_SUCCESS;
}