Exemplo n.º 1
0
/******************************************************************************
 *  alloc_handle
 *
 * Allocates a new handle to the specified object in a given handle table.
 *
 * PARAMS
 *  lpTable  [I] Pointer to the handle table, from which the new handle is 
 *               allocated.
 *  lpObject [I] Pointer to the object, for which a handle shall be allocated.
 *  lpHandle [O] Pointer to a handle variable, into which the handle value will
 *               be stored. If not successful, this will be 
 *               INVALID_HANDLE_VALUE
 * RETURNS
 *  non zero,  if successful
 *  zero,      if not successful (no free handle)
 */
int alloc_handle(HANDLETABLE *lpTable, OBJECTHDR *lpObject, unsigned int *lpHandle)
{
    int ret = 0;
        
    TRACE("(lpTable=%p, lpObject=%p, lpHandle=%p)\n", lpTable, lpObject, lpHandle);
        
    EnterCriticalSection(&lpTable->mutex);
    if (lpTable->iFirstFree >= lpTable->iEntries) 
        if (!grow_handle_table(lpTable))
        {
            *lpHandle = (unsigned int)INVALID_HANDLE_VALUE;
            goto exit;
        }

    *lpHandle = INDEX2HANDLE(lpTable->iFirstFree);
    
    lpTable->paEntries[lpTable->iFirstFree].pObject = lpObject;
    lpTable->iFirstFree = lpTable->paEntries[lpTable->iFirstFree].iNextFree;
    InterlockedIncrement(&lpObject->refcount);

    ret = 1;
exit:
    LeaveCriticalSection(&lpTable->mutex);
    return ret;
}
Exemplo n.º 2
0
/* allocate the first free entry in the handle table */
static obj_handle_t alloc_entry( struct handle_table *table, void *obj, unsigned int access )
{
    struct handle_entry *entry = table->entries + table->free;
    int i;

    for (i = table->free; i <= table->last; i++, entry++) if (!entry->ptr) goto found;
    if (i >= table->count)
    {
        if (!grow_handle_table( table )) return 0;
        entry = table->entries + i;  /* the entries may have moved */
    }
    table->last = i;
 found:
    table->free = i + 1;
    entry->ptr    = grab_object_for_handle( obj );
    entry->access = access;
    return index_to_handle(i);
}