[ios, macos] Raise exception if MGLMapSnapshotter is used from thread…

… without active run loop.
mapbox · May 29, 2018 · 98727ca · 98727ca
1 parent 59ef266
commit 98727ca
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/platform/darwin/src/MGLMapSnapshotter.mm b/platform/darwin/src/MGLMapSnapshotter.mm
@@ -108,6 +108,11 @@ - (void)startWithCompletionHandler:(MGLMapSnapshotCompletionHandler)completion
 
 - (void)startWithQueue:(dispatch_queue_t)queue completionHandler:(MGLMapSnapshotCompletionHandler)completion
 {
+    if (!mbgl::Scheduler::GetCurrent()) {
+        [NSException raise:NSInvalidArgumentException
+                    format:@"startWithQueue:completionHandler: must be called from a thread with an active run loop."];
+    }
+
     if ([self isLoading]) {
         [NSException raise:NSInternalInconsistencyException
                     format:@"Already started this snapshotter."];