int smem_open(char *filename, int rwmode, int *driverhandle)
{ int h, nitems, r;
DAL_SHM_SEGHEAD *sp;
if (NULL == filename) return(SHARED_NULPTR);
if (NULL == driverhandle) return(SHARED_NULPTR);
nitems = sscanf(filename, "h%d", &h);
if (1 != nitems) return(SHARED_BADARG);
if (SHARED_OK != (r = shared_attach(h))) return(r);
if (NULL == (sp = (DAL_SHM_SEGHEAD *)shared_lock(h,
((READWRITE == rwmode) ? SHARED_RDWRITE : SHARED_RDONLY))))
{ shared_free(h);
return(SHARED_BADARG);
}
if ((h != sp->h) || (DAL_SHM_SEGHEAD_ID != sp->ID))
{ shared_unlock(h);
shared_free(h);
return(SHARED_BADARG);
}
*driverhandle = h;
return(0);
}
//------------------------------do_monitor_exit--------------------------------
void Parse::do_monitor_exit() {
kill_dead_locals();
pop(); // Pop oop to unlock
// Because monitors are guaranteed paired (else we bail out), we know
// the matching Lock for this Unlock. Hence we know there is no need
// for a null check on Unlock.
shared_unlock(map()->peek_monitor_box(), map()->peek_monitor_obj());
}
int smem_remove(char *filename)
{ int nitems, h, r;
if (NULL == filename) return(SHARED_NULPTR);
nitems = sscanf(filename, "h%d", &h);
if (1 != nitems) return(SHARED_BADARG);
if (0 == shared_check_locked_index(h)) /* are we locked ? */
{ if (-1 != shared_lt[h].lkcnt) /* are we locked RO ? */
{ if (SHARED_OK != (r = shared_unlock(h))) return(r); /* yes, so relock in RW */
if (NULL == shared_lock(h, SHARED_RDWRITE)) return(SHARED_BADARG);
}
}
else /* not locked */
{ if (SHARED_OK != (r = smem_open(filename, READWRITE, &h)))
return(r); /* so open in RW mode */
}
shared_set_attr(h, SHARED_RESIZE); /* delete PERSIST attribute */
return(smem_close(h)); /* detach segment (this will delete it) */
}
int smem_close(int driverhandle)
{ int r;
if (SHARED_OK != (r = shared_unlock(driverhandle))) return(r);
return(shared_free(driverhandle));
}
