Add main queue precondition to handleBackgroundRefresh

zmanian · claude · zmanian · commit 97a9f83b8567 · 2026-03-07T16:32:15.000-08:00
Fails fast with a clear message if this is ever called off the main
queue, rather than hitting an opaque Swift concurrency isolation crash.

Co-Authored-By: Claude Opus 4.6 &lt;noreply@anthropic.com&gt;
diff --git a/Wisp/Services/LoopManager.swift b/Wisp/Services/LoopManager.swift
@@ -134,6 +134,7 @@ final class LoopManager {
     }
 
     func handleBackgroundRefresh(modelContext: ModelContext) async -> Bool {
+        dispatchPrecondition(condition: .onQueue(.main))
         defer {
             scheduleBackgroundRefresh(modelContext: modelContext)
         }

Original file line number	Diff line number	Diff line change
`@@ -134,6 +134,7 @@ final class LoopManager {`
`134`	`134`	`}`
`135`	`135`
`136`	`136`	`func handleBackgroundRefresh(modelContext: ModelContext) async -> Bool {`
	`137`	`+ dispatchPrecondition(condition: .onQueue(.main))`
`137`	`138`	`defer {`
`138`	`139`	`scheduleBackgroundRefresh(modelContext: modelContext)`
`139`	`140`	`}`