int
get_clearance(int callnumber)
{
sema_t *table_sema = NULL;
char *tab;
if (sema_trywait(&common_sema) == 0) {
(void) thr_setspecific(lookup_state_key, NULL);
return (0);
}
switch (callnumber) {
case GETLDAPCONFIG:
tab = "ldap";
table_sema = &ldap_sema;
break;
default:
logit("Internal Error: get_clearance\n");
break;
}
if (sema_trywait(table_sema) == 0) {
(void) thr_setspecific(lookup_state_key, (void*)1);
return (0);
}
if (current_admin.debug_level >= DBG_CANT_FIND) {
logit("get_clearance: throttling load for %s table\n", tab);
}
return (-1);
}
/*
* get clearance
*/
int
_nscd_get_clearance(sema_t *sema) {
if (sema_trywait(&common_sema) == 0) {
(void) thr_setspecific(lookup_state_key, NULL);
return (0);
}
if (sema_trywait(sema) == 0) {
(void) thr_setspecific(lookup_state_key, (void*)1);
return (0);
}
return (1);
}
int
sem_trywait(sem_t *sem)
{
int error;
if (sem_invalid(sem))
return (-1);
if ((error = sema_trywait((sema_t *)sem)) != 0) {
if (error == EBUSY)
error = EAGAIN;
errno = error;
return (-1);
}
return (0);
}
FINLINE int _sema_timedwait(
sema_t * pSem,
unsigned int msecs)
{
int iErr = 0;
// If timeout is F_WAITFOREVER, do sem_wait.
if( msecs == F_WAITFOREVER)
{
iErr = _sema_wait( pSem);
return( iErr);
}
for( ;;)
{
if( (iErr = sema_trywait( pSem)) != 0)
{
if( iErr == EINTR)
{
iErr = 0;
}
f_sleep( f_min( msecs, 10));
msecs -= f_min( msecs, 10);
if( !msecs)
{
iErr = -1;
goto Exit;
}
continue;
}
}
Exit:
return( iErr);
}