鈥嬩竴锛氳儗鏅?/h2>

1. 璁叉晠浜?/h3>

涓婂懆鐪嬩簡涓€浣嶈缁冭惀鏈嬪弸鐨刣ump锛屾嵁鏈嬪弸璇翠粬鐨勭▼搴忓崱姝讳簡锛岀湅瀹屼箣鍚庡彂鐜版槸涓€渚嬬粡鍏哥殑姝婚攣闂锛岃洰鏈夋剰鎬濓紝杩欎釜妗堜緥绠楁槸瀛︿範 .NET楂樼骇璋冭瘯 鍏ラ棬绾х殑妗堜緥锛岃繖閲屽拰澶у鍒嗕韩涓€涓嬨€?/p>

浜岋細WinDbg 鍒嗘瀽

1. 绋嬪簭涓轰粈涔堜細鍗℃

鍥犱负鏄獥浣撶▼搴忥紝鎵€浠ョ湅涓荤嚎绋嬬殑绾跨▼鏍堝氨濂戒簡锛屽鏋滃崱鍦?nbsp;鐢ㄦ埛鎬佲€?nbsp;閭ｈ繖涓棶棰樼浉瀵瑰鏄撹В鍐筹紝濡傛灉鍗″湪 鍐呮牳鎬?nbsp;杩欎釜闂灏辨瘮杈冨鏉備簡锛岄渶瑕佸紑鍚?WinDbg 鐨勬湰鏈哄唴鏍歌皟璇曟垨鑰呭弻鏈鸿皟璇曟墠鑳芥壘鍒版渶缁堢殑闂銆?/p>

鏃㈢劧宸茬粡璇翠簡鏄叆闂ㄧ骇锛岄偅鑲畾鏄崱鍦?nbsp;鐢ㄦ埛鎬佲€?nbsp;灞傞潰鍟︼紝鎴戜滑鐢?nbsp;!clrstack 鍛戒护瑙傚療涓嬩富绾跨▼鐨勭嚎绋嬫爤鍗冲彲锛岃緭鍑哄涓嬶細

0:000:x86> !clrstack
OS Thread Id: 0x31d8 (0)
Child SP       IP Call Site
00f9ec28 00e9e108 [GCFrame: 00f9ec28] 
00f9ed08 00e9e108 [GCFrame: 00f9ed08] 
00f9ed24 00e9e108 [HelperMethodFrame_1OBJ: 00f9ed24] System.Threading.Monitor.ReliableEnter(System.Object, Boolean ByRef)
00f9eda0 70c08468 System.Threading.Monitor.Enter(System.Object, Boolean ByRef) [f:\dd\ndp\clr\src\BCL\system\threading\monitor.cs @ 62]
00f9edb0 0ce916c7 xxxx.GetAlarmCount(xxx)
00f9ee28 0961f41f xxx.xxx()
00f9ef04 0961d60a xxxx.xxx(System.Object, System.EventArgs)
00f9ef50 6de03dc9 System.Windows.Forms.Timer.OnTick(System.EventArgs)
00f9ef58 6de053d9 System.Windows.Forms.Timer+TimerNativeWindow.WndProc(System.Windows.Forms.Message ByRef)
00f9ef64 6ddd38d0 System.Windows.Forms.NativeWindow.Callback(IntPtr, Int32, IntPtr, IntPtr)
00f9f1b0 0130d5d4 [InlinedCallFrame: 00f9f1b0] 
00f9f1ac 6de375bd DomainBoundILStubClass.IL_STUB_PInvoke(MSG ByRef)
00f9f1b0 6dde44e3 [InlinedCallFrame: 00f9f1b0] System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG ByRef)
00f9f1e4 6dde44e3 System.Windows.Forms.Application+ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr, Int32, Int32)
00f9f1e8 6dde40d1 [InlinedCallFrame: 00f9f1e8] 
00f9f270 6dde40d1 System.Windows.Forms.Application+ThreadContext.RunMessageLoopInner(Int32, System.Windows.Forms.ApplicationContext)
00f9f2c0 6dde3f23 System.Windows.Forms.Application+ThreadContext.RunMessageLoop(Int32, System.Windows.Forms.ApplicationContext)
00f9f2ec 6ddbc83d System.Windows.Forms.Application.Run(System.Windows.Forms.Form)
00f9f300 01350a6e CleanControl.Program.Main(System.String[])
00f9f4ec 71d00556 [GCFrame: 00f9f4ec] 
...

浠庡崷涓湅锛屼富绾跨▼鍗″湪 Monitor.Enter鈥?nbsp;澶勶紝涔熷氨琛ㄦ槑褰撳墠绾跨▼鍦?nbsp;GetAlarmCount() 鏂规硶鐨勪竴涓?lock 澶勭瓑寰呫€?/p>

2. 璋佸湪鎸佹湁閿?/h3>

瑕佹兂鎵惧埌璋佸湪鎸佹湁閿侊紝闇€瑕佺悊瑙?nbsp;lock鈥?nbsp;鐨勫簳灞傛満鍒讹紝瀹冩槸寤虹珛鍦?nbsp;AutoResetEvent + ObjectHeader鈥?nbsp;鍩虹涔嬩笂鐨勪竴绉嶉攣鐜╂硶锛屽湪 CLR 灞傞潰浣跨敤 SyncBlk 鐨?class 鏉ユ壙杞界殑锛屽弬鑰冨涓嬩唬鐮侊細

class SyncBlock
{
 // ObjHeader creates our Mutex and Event
 friend class ObjHeader;
 friend class SyncBlockCache;
 friend struct ThreadQueue;
#ifdef DACCESS_COMPILE
 friend class ClrDataAccess;
#endif
 friend class CheckAsmOffsets;
protected:
 AwareLock  m_Monitor;                    // the actual monitor
 SLink       m_Link;
 DWORD m_dwHashCode;
 WCHAR m_BSTRTrailByte;
}

瑕佹兂瑙傚療杩欎簺 SyncBlk鈥?nbsp;淇℃伅锛屽彲浠ョ敤 WinDbg 鎻愪緵鐨勫揩鎹峰懡浠?nbsp;!syncblk 鏉ヨ瀵熴€?/p>

0:000:x86> !syncblk
Index         SyncBlock MonitorHeld Recursion Owning Thread Info          SyncBlock Owner
  180 0b86e8e8            3         1 01452a08 3728  24   039da140 System.Object
-----------------------------
Total           339
CCW             5
RCW             2
ComClassFactory 0
Free            4

浠庡崷涓湅锛屽綋鍓嶆寔鏈?lock 鐨勭嚎绋嬫槸 24鈥?nbsp;鍙凤紝閭ｈ繖涓嚎绋嬩负浠€涔堣繜杩熶笉閫€鍑洪攣鍛紵杩欏氨闇€瑕佸埌杩欎釜绾跨▼鏍堜笂鎵惧師鍥犱簡, 浣跨敤鍛戒护 ~24s; !clrstack 鍗冲彲銆?/p>

0:004:x86> ~24s
ntdll_779a0000!NtWaitForMultipleObjects+0xc:
77a11b2c c21400          ret     14h
0:024:x86> !clrstack
OS Thread Id: 0x3728 (24)
Child SP       IP Call Site
0e99e504 0000002b [HelperMethodFrame_1OBJ: 0e99e504] System.Threading.WaitHandle.WaitOneNative(System.Runtime.InteropServices.SafeHandle, UInt32, Boolean, Boolean)
0e99e5e8 70bdd952 System.Threading.WaitHandle.InternalWaitOne(System.Runtime.InteropServices.SafeHandle, Int64, Boolean, Boolean) [f:\dd\ndp\clr\src\BCL\system\threading\waithandle.cs @ 243]
0e99e600 70bdd919 System.Threading.WaitHandle.WaitOne(Int32, Boolean) [f:\dd\ndp\clr\src\BCL\system\threading\waithandle.cs @ 194]
0e99e614 6e4aa4a8 System.Windows.Forms.Control.WaitForWaitHandle(System.Threading.WaitHandle)
0e99e654 6e8585af System.Windows.Forms.Control.MarshaledInvoke(System.Windows.Forms.Control, System.Delegate, System.Object[], Boolean)
0e99e658 6e4acc4f [InlinedCallFrame: 0e99e658] 
0e99e6e0 6e4acc4f System.Windows.Forms.Control.Invoke(System.Delegate, System.Object[])
...
0e99e83c 0f46512c xxx.AddAlarmQueue(xxx)
...
0e99ea84 0d3f2783 xxx.Func()
0e99ead8 70be2e01 System.Threading.ThreadHelper.ThreadStart_Context(System.Object) [f:\dd\ndp\clr\src\BCL\system\threading\thread.cs @ 74]
...

浠庡崷涓湅锛屽叾涓殑 MarshaledInvoke 鏂规硶寰堝埡鐪硷紝瀹冭〃绀哄伐浣滅嚎绋嬮€氳繃 Invoke 鍚戜富绾跨▼鐨勬帶浠舵帹閫佹暟鎹紝鍥犱负涓荤嚎绋嬭繜杩熸病鏈夊搷搴斿畠锛屽鑷村畠涓€鐩村湪绛夊緟锛岃€屾伆鎭板畠鍙堟寔鏈変簡 lock 閿侊紝涓嶈刀宸т富绾跨▼鍥犱负鑾峰彇lock鍦ㄨ繜杩熺瓑寰呭張鏃犳硶鍝嶅簲宸ヤ綔绾跨▼鐨?MarshaledInvoke 璇锋眰锛屽鑷翠竴绉嶆閿佺姸鎬侊紝濡傛灉瑕佺敾涓浘澶ф鏄繖鏍风殑銆?/p>

3. 濡備綍鍖栬В

瀵诲緱鍖栬В涔嬫硶锛岄渶瑕佺湅涓嬬▼搴忎腑鏄€庝箞鎸佹湁 lock 閿佺殑锛屼粩缁嗚瀵熶唬鐮佷箣鍚庯紝缁堜簬鎵惧埌浜?lock 浠ｇ爜澶勶紝鎴浘濡備笅锛?/p>

瀵逛唬鐮佹晱鎰熷緱鏈嬪弸鐩镐俊涓€鐪煎氨鑳界湅鍑猴紝杩?lock 鐨勭矑搴︾湡tmd鐨勫ぇ锛屽彧瑕?lock 涓湁涓€澶勮皟鐢ㄤ簡 Invoke锛屽鏋滀笉鍑戝阀涓荤嚎绋嬪垰濂藉湪绛夊緟 lock 锛岄偅灏辨閿佷簡锛屾濡傛湰绡囦腑鐨?姝婚攣銆?/p>

涓夛細鎬荤粨

杩欐鍗℃浜嬫晠锛屾湰璐ㄤ笂鏉ヨ鏄▼搴忓憳瀵归攣鐨勪娇鐢ㄦ病鏈変竴涓ソ鐨勪範鎯紝娌℃湁閬靛惊閿佺殑灏芥棭閲婃斁鍘熷垯銆?/p>

鍏跺疄杩欎竴鍧楀叧绯诲瀷鏁版嵁搴撳仛鐨勭壒鍒ソ锛岄攣鐨勭矑搴﹀垎鐨勫緢缁嗭紝璇稿锛氳閿侊紝RID閿侊紝Key閿侊紝椤甸攣锛岃〃閿侊紝鍦ㄥ繀瑕佺殑鏃跺€欒繕浼氭秹鍙婂埌閿佺殑鍗囩骇锛屽皢鎬ц兘锛岄攣寮€閿€锛屼竴鑷存€?鍋氬埌浜嗘瀬鑷达紝闈炲父鍊煎緱鎴戜滑鐮旂┒鍜屽涔犮€?/p>