XN_C_API XnStatus xnOSCloseMutex(XN_MUTEX_HANDLE* pMutexHandle)
{
// Local function variables
XnStatus nRetVal = XN_STATUS_OK;
// Validate the input/output pointers (to make sure none of them is NULL)
XN_VALIDATE_INPUT_PTR(pMutexHandle);
// Make sure the actual mutex handle isn't NULL
XN_RET_IF_NULL(*pMutexHandle, XN_STATUS_OS_INVALID_MUTEX);
XnMutex* pMutex = *pMutexHandle;
// check the kind of mutex
if (pMutex->bIsNamed)
{
#ifndef XN_PLATFORM_LINUX_NO_SYSV
// decrement second sem
struct sembuf op;
op.sem_num = 1;
op.sem_op = -1;
op.sem_flg = SEM_UNDO;
if (0 != semop(pMutex->NamedSem, &op, 1))
{
return (XN_STATUS_OS_MUTEX_CLOSE_FAILED);
}
// check if sem reached 0 (if so, it can be deleted)
int val = semctl(pMutex->NamedSem, 1, GETVAL);
if (val == 0)
{
// destroy the semaphore
semctl(pMutex->NamedSem, 0, IPC_RMID);
// and remove file
xnOSDeleteFile(pMutex->csSemFileName);
}
// in any case, close the file
close(pMutex->hSemFile);
#endif
}
else
{
// destroy the mutex via the OS
if (0 != pthread_mutex_destroy(&pMutex->ThreadMutex))
{
return (XN_STATUS_OS_MUTEX_CLOSE_FAILED);
}
}
// free the handle
XN_FREE_AND_NULL(*pMutexHandle);
// All is good...
return (XN_STATUS_OK);
}
XnStatus XnLinuxSysVNamedEvent::Destroy()
{
// dec ref count
struct sembuf op;
op.sem_num = XN_EVENT_SEM_REF_COUNT;
op.sem_op = -1;
op.sem_flg = IPC_NOWAIT | SEM_UNDO;
semop(m_hSem, &op, 1);
// check current ref count. If 0, destroy it
int val = semctl(m_hSem, 0, GETVAL);
if (0 == val)
{
// destroy the semaphore
semctl(m_hSem, 0, IPC_RMID);
// and remove file
xnOSDeleteFile(m_csSemFileName);
}
return (XN_STATUS_OK);
}
