We recently updated to Xcode 14.0.1 and it started throwing a TPC (Thread Performance Checker) warning about potential hang risk due to priority inversion. Detailed logs below. We never saw any TPC warning in Xcode 13. Is this something on Heap’s radar to solve? Or can we do something on our end to resolve the issue?
Attaching logs from Xcode’s debugger and also attaching a screenshot of the TPC analyzer.
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Thread Performance Checker: Thread running at QOS_CLASS_USER_INTERACTIVE waiting on a lower QoS thread running at QOS_CLASS_DEFAULT. Investigate ways to avoid priority inversions
PID: 20145, TID: 146901
Backtrace
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3 Hearsay Msgs 0x000000010144fac4 -[_heap_SRRunLoopThread runLoop] + 32
4 Hearsay Msgs 0x000000010144f8cd __53+[NSRunLoop(heap_SRWebSocket) heap_SR_networkRunLoop]_block_invoke + 117
5 libdispatch.dylib 0x0000000115252f5b _dispatch_client_callout + 8
6 libdispatch.dylib 0x00000001152545b5 _dispatch_once_callout + 66
7 Hearsay Msgs 0x000000010144f856 +[NSRunLoop(heap_SRWebSocket) heap_SR_networkRunLoop] + 46
8 Hearsay Msgs 0x000000010144b380 -[heap_SRWebSocket openConnection] + 76
9 Hearsay Msgs 0x0000000101449e7f -[heap_SRWebSocket open] + 210
10 Hearsay Msgs 0x000000010145615e -[heap_SocketIOTransportWebsocket open] + 652
11 Hearsay Msgs 0x000000010145454f -[heap_SocketIO connectionDidFinishLoading:] + 957
12 CFNetwork 0x000000010c5ff13a __CFTubeSetTubeTypeNotifier + 106715
13 CFNetwork 0x000000010c5ff0fa __CFTubeSetTubeTypeNotifier + 106651
14 CFNetwork 0x000000010c5ff1bf __CFTubeSetTubeTypeNotifier + 106848
15 CFNetwork 0x000000010c531536 _CFNetworkSetATSContext + 52688
16 CFNetwork 0x000000010c5310dd _CFNetworkSetATSContext + 51575
17 libdispatch.dylib 0x0000000115252f5b _dispatch_client_callout + 8
18 libdispatch.dylib 0x00000001152568d2 _dispatch_block_invoke_direct + 496
19 CFNetwork 0x000000010c5dcc08 _CFURLStorageSessionDisableCache + 58199
20 CoreFoundation 0x0000000111a66f2b CFArrayApplyFunction + 67
21 CFNetwork 0x000000010c5dcb2d _CFURLStorageSessionDisableCache + 57980
22 CFNetwork 0x000000010c5de84d _CFURLStorageSessionDisableCache + 65436
23 CoreFoundation 0x0000000111ae8ebd __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
24 CoreFoundation 0x0000000111ae8dfc __CFRunLoopDoSource0 + 157
25 CoreFoundation 0x0000000111ae85f9 __CFRunLoopDoSources0 + 212
26 CoreFoundation 0x0000000111ae2db3 __CFRunLoopRun + 927
27 CoreFoundation 0x0000000111ae2637 CFRunLoopRunSpecific + 560
28 GraphicsServices 0x000000011871928a GSEventRunModal + 139
29 UIKitCore 0x00000001291df425 -[UIApplication _run] + 994
30 UIKitCore 0x00000001291e4301 UIApplicationMain + 123
31 Hearsay Msgs 0x00000001013aca5f main + 63
Best answer by Jonas-Heap
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