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/* $Id$ */
/*
* Copyright (c) 1995-1996 Sam Leffler
* Copyright (c) 1995-1996 Silicon Graphics, Inc.
* HylaFAX is a trademark of Silicon Graphics
*
* Permission to use, copy, modify, distribute, and sell this software and
* its documentation for any purpose is hereby granted without fee, provided
* that (i) the above copyright notices and this permission notice appear in
* all copies of the software and related documentation, and (ii) the names of
* Sam Leffler and Silicon Graphics may not be used in any advertising or
* publicity relating to the software without the specific, prior written
* permission of Sam Leffler and Silicon Graphics.
*
* THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
* EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
* WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
*
* IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
* ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
* OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
* WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
* LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
* OF THIS SOFTWARE.
*/
#include "Trigger.h"
#include "TriggerRef.h"
/*
* Reference-counted trigger references.
*/
TriggerRef::TriggerRef(Trigger& tr) : ref(tr) { tr.refs++; }
TriggerRef::~TriggerRef() { ref.refs--; }
/*
* Purge a list of references. If any of these
* triggers are referenced only by this list, then
* purge the trigger as well.
*/
void
TriggerRef::purge(QLink& head)
{
QLink* next;
for (QLink* ql = head.next; ql != &head; ql = next) {
next = ql->next;
TriggerRef* tr = (TriggerRef*) ql;
Trigger* t = &tr->ref;
delete tr;
if (t->refs == 0)
delete t;
}
}
/*
* Purge references to a specific trigger.
*/
void
TriggerRef::purge(QLink& head, Trigger* t)
{
QLink* next;
for (QLink* ql = head.next; ql != &head; ql = next) {
next = ql->next;
TriggerRef* tr = (TriggerRef*) ql;
if (&tr->ref == t) {
tr->remove(); // decrements refs as a side effect
delete tr;
if (t->refs == 0)
return;
}
}
}
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