MJ_LOCK 造成线程优先级倒置

[winterrain5]

Thread Performance Checker: Thread running at User-interactive quality-of-service class waiting on a lower QoS thread running at Default quality-of-service class. Investigate ways to avoid priority inversions
PID: 1124, TID: 45004
Backtrace

3 MJExtension 0x0000000105d89828 -[MJProperty objectClassInArrayForClass:] + 112
4 MJExtension 0x0000000105d8cb28 __48-[NSObject(MJKeyValue) mj_setKeyValues:context:]_block_invoke + 1652
5 MJExtension 0x0000000105d91024 +[NSObject(Property) mj_enumerateProperties:] + 292
6 MJExtension 0x0000000105d8c378 -[NSObject(MJKeyValue) mj_setKeyValues:context:] + 660
7 MJExtension 0x0000000105d8c0b8 -[NSObject(MJKeyValue) mj_setKeyValues:] + 72
8 MJExtension 0x0000000105d8dd40 +[NSObject(MJKeyValue) mj_objectWithKeyValues:context:] + 528
9 MJExtension 0x0000000105d8ce40 __48-[NSObject(MJKeyValue) mj_setKeyValues:context:]_block_invoke + 2444
10 MJExtension 0x0000000105d91024 +[NSObject(Property) mj_enumerateProperties:] + 292
11 MJExtension 0x0000000105d8c378 -[NSObject(MJKeyValue) mj_setKeyValues:context:] + 660
12 MJExtension 0x0000000105d8c0b8 -[NSObject(MJKeyValue) mj_setKeyValues:] + 72
13 MJExtension 0x0000000105d8dd40 +[NSObject(MJKeyValue) mj_objectWithKeyValues:context:] + 528
14 MJExtension 0x0000000105d8ce40 __48-[NSObject(MJKeyValue) mj_setKeyValues:context:]_block_invoke + 2444
15 MJExtension 0x0000000105d91024 +[NSObject(Property) mj_enumerateProperties:] + 292
16 MJExtension 0x0000000105d8c378 -[NSObject(MJKeyValue) mj_setKeyValues:context:] + 660
17 MJExtension 0x0000000105d8c0b8 -[NSObject(MJKeyValue) mj_setKeyValues:] + 72
18 MJExtension 0x0000000105d8dd40 +[NSObject(MJKeyValue) mj_objectWithKeyValues:context:] + 528
19 MJExtension 0x0000000105d8e368 +[NSObject(MJKeyValue) mj_objectArrayWithKeyValuesArray:context:] + 708
20 MJExtension 0x0000000105d8e078 +[NSObject(MJKeyValue) mj_objectArrayWithKeyValuesArray:] + 72
21 Wecyn 0x00000001030d8ce4 __74-[OIMManager(Conversation) getAllConversationListWithOnSuccess:onFailure:]_block_invoke + 96
22 Wecyn 0x00000001030c9ecc __27-[CallbackProxy onSuccess:]_block_invoke + 80
23 Wecyn 0x00000001030c9ff8 __36-[CallbackProxy dispatchMainThread:]_block_invoke + 40
24 libdispatch.dylib 0x0000000108130f50 _dispatch_call_block_and_release + 32
25 libdispatch.dylib 0x0000000108132b34 _dispatch_client_callout + 20
26 libdispatch.dylib 0x0000000108142fec _dispatch_main_queue_drain + 1084
27 libdispatch.dylib 0x0000000108142ba0 _dispatch_main_queue_callback_4CF + 44
28 CoreFoundation 0x00000001ab444f9c 5A6C1F41-BF70-32F6-A1D6-5B894DD21362 + 225180
29 CoreFoundation 0x00000001ab441ca8 5A6C1F41-BF70-32F6-A1D6-5B894DD21362 + 212136
30 CoreFoundation 0x00000001ab4413f8 CFRunLoopRunSpecific + 608
31 GraphicsServices 0x00000001ee9cf4f8 GSEventRunModal + 164
32 UIKitCore 0x00000001ad8678a0 2D538446-6E40-3C10-8A5F-559C938077A0 + 2279584
33 UIKitCore 0x00000001ad866edc UIApplicationMain + 340
34 Wecyn 0x00000001023059c0 main + 64
35 dyld 0x00000001ce196dcc 28D6D2C1-46CE-3D58-B744-B06A6C573888 + 24012

运行环境

• iPhoneSE 2
• iOS 17.2
• Xcode 14
• MJExtension: 3.4.2

[winterrain5]

问题发生的代码块：

• (Class)objectClassInArrayForClass:(Class)c
  {
  NSString *key = NSStringFromClass(c);
  if (!key) return nil;

  MJ_LOCK(self.objectClassInArrayLock);
  Class objectClass = self.objectClassInArrayDict[key];
  MJ_UNLOCK(self.objectClassInArrayLock);
  return objectClass;
  }