/******************************************************************************
* 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;
}
/* 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);
}