<html aria-label="message body"><head><meta http-equiv="content-type" content="text/html; charset=us-ascii"></head><body style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;">You can call the function `CCTK_TerminateNext`, which will stop the simulation gracefully after the current iteration finishes. This is built-in, you do not need a special thorn for this.<div><br></div><div>This is how TerminationTrigger is implemented: It calls this function when a certain file is created.<br><div><br></div><div>-erik<br id="lineBreakAtBeginningOfMessage"><div><br><blockquote type="cite"><div>On Jun 4, 2026, at 09:31, Jordan Nicoules via Users <users@einsteintoolkit.org> wrote:</div><br class="Apple-interchange-newline"><div><div id="divtagdefaultwrapper" dir="ltr" style="font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-line: none; text-decoration-thickness: auto; text-decoration-style: solid; font-size: 12pt; font-family: Calibri, Helvetica, sans-serif;"><div style="margin-top: 0px; margin-bottom: 0px;">Dear all,</div><div style="margin-top: 0px; margin-bottom: 0px;"><br></div><div style="margin-top: 0px; margin-bottom: 0px;">I was wondering if there was a built-in way to trigger the termination of a simulation when something specific happens, along the lines of what Trigger does to steer quantities. From what I understand, Trigger does not offer that possibility, and TerminationTrigger checks either a file or a time limit. What I'm considering would be more along the lines of "an apparent horizon is found so trigger termination", in order to steer some parameters at recovery.</div><div style="margin-top: 0px; margin-bottom: 0px;"><br></div><div style="margin-top: 0px; margin-bottom: 0px;">If there's no such explicit way, I'm happy to try to implement that in Trigger. I actually have ideas of other small improvements to Trigger that I could try contributing as well (namely, increase the maximum number of triggers and allow one trigger to have multiple consequences at once).</div><div style="margin-top: 0px; margin-bottom: 0px;"><br></div><div style="margin-top: 0px; margin-bottom: 0px;">Unfortunately I won't be able to join the weekly call today to discuss this directly.</div><div style="margin-top: 0px; margin-bottom: 0px;"><br></div><div style="margin-top: 0px; margin-bottom: 0px;">Best,</div><div style="margin-top: 0px; margin-bottom: 0px;"><br></div><div style="margin-top: 0px; margin-bottom: 0px;">Jordan</div></div><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;">_______________________________________________</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-line: none; text-decoration-thickness: auto; text-decoration-style: solid;"><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;">Users mailing list</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-line: none; text-decoration-thickness: auto; text-decoration-style: solid;"><a href="mailto:Users@einsteintoolkit.org" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px;">Users@einsteintoolkit.org</a><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration-line: none; text-decoration-thickness: auto; text-decoration-style: solid;"><a href="http://lists.einsteintoolkit.org/mailman/listinfo/users" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px;">http://lists.einsteintoolkit.org/mailman/listinfo/users</a></div></blockquote></div><br></div></div></body></html>